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CX2SA > SATDIG 07.03.11 06:25l 1465 Lines 49478 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Antenna Analyzer (Clint Bradford)
2. Re: Antenna Analyzer (i8cvs)
3. Re: Antenna Analyzer (Edward R. Cole)
4. Re: AMSAT-BB Digest, Vol 6, Issue 142 (Louis McFadin)
5. Re: Antenna Analyzer (Alan P. Biddle)
6. Sat Programs for IPAQ ? (Ted)
7. Re: Antenna Analyzer (Art McBride)
8. Re: Antenna Analyzer (i8cvs)
9. Re: Antenna Analyzer (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Sun, 6 Mar 2011 12:28:06 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: amsat-bb@xxxxx.xxx
Message-ID: <C30AA08C-56B7-47DA-8CB6-3E6CE2B3578F@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
First, befriend a Motorola technician at your local Moto dealership - if you
haven't already.
And you really have two price-point options: about US$400 for an MFJ-269, or
a true piece of bench service gear at about US$5000.
If you get an MFJ-269, "use" your contact with a real service tech to
"compare" results. There was an issue with QC on the MFJ-269 (SOURCE:
Personal experience, as I sold them for a couple of years). So - if you get
a good one - or one with consistent results, you'll really enjoy it.
Clint, K6LCS
909-241-7666
------------------------------
Message: 2
Date: Sun, 6 Mar 2011 21:30:12 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: <kc6uqh@xxx.xxx>, "'Pete Rowe'" <ptrowe@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>, "'Howard Kowall'" <hkowall@xxxx.xx>
Message-ID: <002701cbdc3d$4b9a24a0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Art, KC6UQH
If you are satisfied with an antenna VSWR in the order of 1.5 : 1 then
you don't need an antenna analyser but only a VSWR meter.
An antenna analyser must be able to measure with accuracy the real part and
the imaginary part of the impedance i.e. the resistive and the reactive part
of the impedance Z = R +/- jX
For example the same antenna VSWR of 1.5 : 1 can be obtained with an
antenna impedance having the following values and all of them are laying
over the same VSWR circle of the Smith Chart
Z1 = 38+j13 ohm
Z2 = 66+j16 ohm
Z3 = 58- j20 ohm
Z4 = 34- j0 ohm
Since the same VSWR can be found over a VSWR circle then the values
of the impedance giving the same VSWR are infinite values.
The MFJ-269 analyser make acceptable R +/-jX measurements only up to
30 MHz but fail to measure accurate resistive and reactive part of the
impedance above 30 MHz and in other words it is not a respectable antenna
analyser.
Why to wast money to buy an antenna analyser to measure wrong values of
Z= R+/- jX if been happy with only the value of the VSWR you need only a
VSWR meter ?
73" de
i8CVS Domenico
----- Original Message -----
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'i8cvs'" <domenico.i8cvs@xxx.xx>; "'Pete Rowe'" <ptrowe@xxxxx.xxx>;
"'AMSAT BB'" <amsat-bb@xxxxx.xxx>; "'Howard Kowall'" <hkowall@xxxx.xx>
Sent: Sunday, March 06, 2011 7:38 PM
Subject: RE: [amsat-bb] Re: Antenna Analyzer
> Domenico,
>
> For most Amateur Radio work a VSWR of 1.5:1 is adequate. I personally have
> never expected MFJ products to be in the League of Anristu, HP and Rohde
and
> Swartz.
> MFJ is a yard stick, the others are a micrometers
> Art,
> KC6UQH
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of i8cvs
> Sent: Sunday, March 06, 2011 9:41 AM
> To: Pete Rowe; AMSAT BB; Howard Kowall
> Subject: [amsat-bb] Re: Antenna Analyzer
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers
and
> I have found that at most the MFJ is usable up to 30 MHz maximum because
> above 30 MHz the inaccuracy on the real part and the imaginary part of the
> impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting and calibration but
I
> belive that the above instrument was a very bad affair for me and will be
a
> bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 4:45 PM
> Subject: [amsat-bb] Re: Antenna Analyzer
>
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy
> size. Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
> draws some power from the batteries with the power switch OFF. So I take
one
> of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb] Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
> antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
> flavors.The standard swr bridge is just not cutting it anymore.So I guess
> what I am looking for is one that will do 3mhz to 500mhz,nice to have
> computer interface but not a priority.I have seen a few on the internet
but
> its nice to get some user input,rather then the sales pitches.
> Thanks to all who read and reply in advance
> Howard
> VE4ISP
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> __________ Information from ESET NOD32 Antivirus, version of virus
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> database 5929 (20110305) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
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>
>
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signature
> database 5931 (20110306) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
------------------------------
Message: 3
Date: Sun, 06 Mar 2011 12:03:18 -0900
From: "Edward R. Cole" <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: amsat-bb@xxxxx.xxx
Message-ID: <201103062103.p26L3Q5X068642@xxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 11:28 AM 3/6/2011, Clint Bradford wrote:
>First, befriend a Motorola technician at your local Moto dealership
>- if you haven't already.
>
>And you really have two price-point options: about US$400 for an
>MFJ-269, or a true piece of bench service gear at about US$5000.
>
>If you get an MFJ-269, "use" your contact with a real service tech
>to "compare" results. There was an issue with QC on the MFJ-269
>(SOURCE: Personal experience, as I sold them for a couple of years).
>So - if you get a good one - or one with consistent results, you'll
>really enjoy it.
>
>Clint, K6LCS
>909-241-7666
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I bought mine used on e-bay and spent too much for it. Failed the
third day and cost me $70+shipping to get it fixed by MFJ. I ended
up spending more than a brand new unit ;-) But is compares well with
Bird43 measurements (which are 95% accurate) so good enough for ham
use at my place. I modified mine to operate on LF for tuning loading
coils on those "short" LF antennas. See my website under tech topics.
I ran it on a 4AH gel-cell for a couple years until I got tired of
lugging around the battery (installed ten NiMH AA cells and charge it
with the bench PS). It is very handy for those quick checks of
antennas or cables.
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter?
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
------------------------------
Message: 4
Date: Sun, 06 Mar 2011 16:56:39 -0500
From: Louis McFadin <w5did@xxx.xxx>
Subject: [amsat-bb] Re: AMSAT-BB Digest, Vol 6, Issue 142
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <D840EB58-E699-46A0-95AE-94999C7304FF@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
Try an AEA VIA Echo. A lot more than the MFJ but worth it.
Sent from my iPhone
On Mar 6, 2011, at 15:00, amsat-bb-request@xxxxx.xxx wrote:
> Send AMSAT-BB mailing list submissions to
> amsat-bb@xxxxx.xxx
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://amsat.org/mailman/listinfo/amsat-bb
> or, via email, send a message with subject or body 'help' to
> amsat-bb-request@xxxxx.xxx
>
> You can reach the person managing the list at
> amsat-bb-owner@xxxxx.xxx
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of AMSAT-BB digest..."
>
>
> Today's Topics:
>
> 1. Re: AO-51 and L/U PacSat BBS Mode (Mark L. Hammond)
> 2. Re: Antenna Analyzer (Pete Rowe)
> 3. AO7 on Mode A (John Geiger)
> 4. SATPC32 ISS Showing weird operation (Marc Tessier - VE3TES)
> 5. Re: Antenna Analyzer (i8cvs)
> 6. Re: Antenna Analyzer (Art McBride)
> 7. Re: Antenna Analyzer (Pete Rowe)
> 8. Re: SATPC32 ISS Showing weird operation (Alan P. Biddle)
> 9. Re: SATPC32 ISS Showing weird operation (Greg D.)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 06 Mar 2011 10:08:14 -0500
> From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
> Subject: [amsat-bb] Re: AO-51 and L/U PacSat BBS Mode
> To: "Bob Bruninga" <bruninga@xxxx.xxx>, <APBIDDLE@xxxxxxx.xxx>,
> "'Vincenzo Mone'" <vimone@xxxxx.xx>, "'Amsat - BBs'"
> <amsat-bb@xxxxx.xxx>
> Message-ID: <Fr8H1g00156cfur05r8HJ4@xxxxx.xxx>
> Content-Type: text/plain; charset="us-ascii"
>
> You can guess my answer...
>
> Yes :)
>
> We make every attempt to keep the digipeater ON when the BBS is on. In
fact, I think the default from a full reload of the satellite is DIGI ON.
>
>
> 73,
>
> Mark N8MH
>
> At 09:30 AM 3/6/2011 -0500, Bob Bruninga wrote:
>> You can guess my question...
>> Is UI digipeat enabled?
>>
>>> It is definitely harder to access on the L uplink
>>> than on the rarely used V uplink, but it does work.
>>
>> Bob, WB4APR
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 6 Mar 2011 07:45:06 -0800 (PST)
> From: Pete Rowe <ptrowe@xxxxx.xxx>
> Subject: [amsat-bb] Re: Antenna Analyzer
> To: AMSAT BB <amsat-bb@xxxxx.xxx>, Howard Kowall <hkowall@xxxx.xx>
> Message-ID: <934887.34524.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer.? It is very accurate and a
handy size.? Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
draws some power from the batteries with the power switch OFF. So I take one
of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb] Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
flavors.The standard swr bridge is just not cutting it anymore.So I guess
what I am looking for is one that will do 3mhz to 500mhz,nice to have
computer interface but not a priority.I have seen a few on the internet but
its nice to get some user input,rather then the sales pitches.
> Thanks to all who read and reply in advance
> Howard
> VE4ISP
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 6 Mar 2011 16:09:50 -0000
> From: "John Geiger" <aa5jg@xxxxxxx.xxx>
> Subject: [amsat-bb] AO7 on Mode A
> To: "Amsat-Bb@xxxxx. Org" <amsat-bb@xxxxx.xxx>
> Message-ID: <0F53FE515CD94CF4B09A0FBA80DCE95D@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Has there been much activity on Mode A recently?
>
> 73s John AA5JG
>
> ------------------------------
>
> Message: 4
> Date: Sun, 6 Mar 2011 12:21:24 -0500
> From: "Marc Tessier - VE3TES" <ve3tes@xxxxxx.xx>
> Subject: [amsat-bb] SATPC32 ISS Showing weird operation
> To: <amsat-bb@xxxxx.xxx>
> Message-ID: <76D433D9E1B9470F923E1374E863F790@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello group, after finally getting my SSB part of the station fully
operational, I then moved on to getting my packet operations up and running
, and with great success, one wee problem, I have noticed this when
tracking the ISS, I am able to still digipeat off the station even long
after it is supposed to be beyond the horizon according to my Satpc32 ISS
software. My keps are up to date via the Satpc32 software, is there a error
due to the large amount of mass now docked on the ISS? or have the keps not
be uploaded in a timely fashion to the server I get my keps from?...
>
> Run down of my operation conditions here are as follows...
>
> Radio - Kenwood TS2000
> Software SATPC32 + Satpc32 ISS
> PC - Dell P4 2.4Ghz CPU with internet connection
>
> Is there another method of getting my keps to show more accurate tracking
of this big bird?...
>
> Regards,
>
> Marc Tessier - VE3TES
> ve3tes@xxxxxx.xx
> Grid FN25pa
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
signature database 5930 (20110306) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 6 Mar 2011 18:40:56 +0100
> From: "i8cvs" <domenico.i8cvs@xxx.xx>
> Subject: [amsat-bb] Re: Antenna Analyzer
> To: "Pete Rowe" <ptrowe@xxxxx.xxx>, "AMSAT BB" <amsat-bb@xxxxx.xxx>,
> "Howard Kowall" <hkowall@xxxx.xx>
> Message-ID: <000001cbdc25$e41875a0$0401a8c0@xxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers and
> I have found that at most the MFJ is usable up to 30 MHz maximum because
> above 30 MHz the inaccuracy on the real part and the imaginary part of the
> impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting and calibration but I
> belive that the above instrument was a very bad affair for me and will be a
> bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 4:45 PM
> Subject: [amsat-bb] Re: Antenna Analyzer
>
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy
> size. Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
> draws some power from the batteries with the power switch OFF. So I take one
> of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb] Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
> antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
> flavors.The standard swr bridge is just not cutting it anymore.So I guess
> what I am looking for is one that will do 3mhz to 500mhz,nice to have
> computer interface but not a priority.I have seen a few on the internet but
> its nice to get some user input,rather then the sales pitches.
> Thanks to all who read and reply in advance
> Howard
> VE4ISP
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
> ------------------------------
>
> Message: 6
> Date: Sun, 6 Mar 2011 10:38:32 -0800
> From: "Art McBride" <kc6uqh@xxx.xxx>
> Subject: [amsat-bb] Re: Antenna Analyzer
> To: "'i8cvs'" <domenico.i8cvs@xxx.xx>, "'Pete Rowe'"
> <ptrowe@xxxxx.xxx>, "'AMSAT BB'" <amsat-bb@xxxxx.xxx>, "'Howard
> Kowall'" <hkowall@xxxx.xx>
> Message-ID: <D4644327646E4B25BA81B47CB6463BDB@xxxxxx>
> Content-Type: text/plain; charset="us-ascii"
>
> Domenico,
>
> For most Amateur Radio work a VSWR of 1.5:1 is adequate. I personally have
> never expected MFJ products to be in the League of Anristu, HP and Rohde and
> Swartz.
> MFJ is a yard stick, the others are a micrometers
> Art,
> KC6UQH
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of i8cvs
> Sent: Sunday, March 06, 2011 9:41 AM
> To: Pete Rowe; AMSAT BB; Howard Kowall
> Subject: [amsat-bb] Re: Antenna Analyzer
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers and
> I have found that at most the MFJ is usable up to 30 MHz maximum because
> above 30 MHz the inaccuracy on the real part and the imaginary part of the
> impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting and calibration but I
> belive that the above instrument was a very bad affair for me and will be a
> bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 4:45 PM
> Subject: [amsat-bb] Re: Antenna Analyzer
>
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy
> size. Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
> draws some power from the batteries with the power switch OFF. So I take one
> of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb] Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
> antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
> flavors.The standard swr bridge is just not cutting it anymore.So I guess
> what I am looking for is one that will do 3mhz to 500mhz,nice to have
> computer interface but not a priority.I have seen a few on the internet but
> its nice to get some user input,rather then the sales pitches.
> Thanks to all who read and reply in advance
> Howard
> VE4ISP
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> __________ Information from ESET NOD32 Antivirus, version of virus signature
> database 5929 (20110305) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
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>
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>
> The message was checked by ESET NOD32 Antivirus.
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> http://www.eset.com
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> ------------------------------
>
> Message: 7
> Date: Sun, 6 Mar 2011 10:45:27 -0800 (PST)
> From: Pete Rowe <ptrowe@xxxxx.xxx>
> Subject: [amsat-bb] Re: Antenna Analyzer
> To: AMSAT BB <amsat-bb@xxxxx.xxx>, Howard Kowall <hkowall@xxxx.xx>,
> i8cvs <domenico.i8cvs@xxx.xx>
> Message-ID: <601661.85707.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
> Content-Type: text/plain; charset=iso-8859-1
>
> Thanks Dominico
> I have also compared my unit with an HP network analyzer and have found
the readings to be quite acceptable for amateur work.?? Mine reads 1.0 :1
into a precision load up to 170 MHz.? Indeed, it reads 1.1:1 at UHF and that
is just fine for my measurements. Rarely do I see an antenna match less than
1.1:1.
>
> 73,
> Pete
>
>
> --- On Sun, 3/6/11, i8cvs <domenico.i8cvs@xxx.xx> wrote:
>
> From: i8cvs <domenico.i8cvs@xxx.xx>
> Subject: Re: [amsat-bb] Re: Antenna Analyzer
> To: "Pete Rowe" <ptrowe@xxxxx.xxx>, "AMSAT BB" <amsat-bb@xxxxx.xxx>,
"Howard Kowall" <hkowall@xxxx.xx>
> Date: Sunday, March 6, 2011, 9:40 AM
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers and
> I have found that at most the MFJ is usable up to 30 MHz maximum because
> above 30 MHz the inaccuracy on the real part and the imaginary part of the
> impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting? and calibration but I
> belive that the above instrument was a very bad affair for me and will be a
> bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if? dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 4:45 PM
> Subject: [amsat-bb] Re: Antenna Analyzer
>
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy
> size. Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
> draws some power from the batteries with the power switch OFF. So I take one
> of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb]? Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
> antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
> flavors.The standard swr bridge is just not cutting it anymore.So I guess
> what I am looking for is one that will do 3mhz to 50
------------------------------
Message: 5
Date: Sun, 6 Mar 2011 16:44:44 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: "'Clint Bradford'" <clintbrad4d@xxxxxxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <866362D0EF0649848C966A9D97E9B1A6@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Clint,
There are a few units filling in that price range, fortunately much closer
to MFJ than the Motorola in price.
http://www.rigexpert.com/
http://www.w5big.com/
My MFJ-269 is great on HF, but even after calibration is problematical on
VHF and up. I keep wanting to replace it, but having recently bought some
new, expensive toys, can't justify something I don't use that often.
Alan
WA4SCA
------------------------------
Message: 6
Date: Sun, 6 Mar 2011 15:49:09 -0800
From: "Ted" <k7trkradio@xxxxxxx.xxx>
Subject: [amsat-bb] Sat Programs for IPAQ ?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <F552E84B56E74E96B9FCDA399244F0D5@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
I just ran across our 'retired' IPAQ Pocket PC (how far we have come,
right?.)
Anyway, is anyone aware of any programs that might work on this thing to at
least display a sat track. I thought it might be useful if it were nailed to
my Arrow or at least in a shirt pocket..
Any help appreciated
Ted, K7TRK
------------------------------
Message: 7
Date: Sun, 6 Mar 2011 17:38:08 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: "'i8cvs'" <domenico.i8cvs@xxx.xx>, "'Pete Rowe'"
<ptrowe@xxxxx.xxx>, "'AMSAT BB'" <amsat-bb@xxxxx.xxx>, "'Howard
Kowall'" <hkowall@xxxx.xx>
Message-ID: <603133BD761B42EFA817367D4C3359EA@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Domenico,
A. It is much smaller than MY H/P 8410 + 8414 + test set, & sweep generator.
B. It will tell me if the resistive arm is above or below 50 Ohms.
C. It will give me the reactance Vs frequency with in 10 ohms.
D. It is battery operated, portable, and can be used on a tower.
E. It costs less than a 1 month rental of a quality Network Analyzer.
F. A VSWR measurement will not separate the resistive and reactive arms
G. When tuning an antenna you never start at 1.5 :1!If it is that good there
is no need to tune it.
73,
Art,
KC6UQH
-----Original Message-----
From: i8cvs [mailto:domenico.i8cvs@xxx.xxx
Sent: Sunday, March 06, 2011 12:30 PM
To: kc6uqh@xxx.xxxx 'Pete Rowe'; 'AMSAT BB'; 'Howard Kowall'
Subject: Re: [amsat-bb] Re: Antenna Analyzer
Hi Art, KC6UQH
If you are satisfied with an antenna VSWR in the order of 1.5 : 1 then
you don't need an antenna analyser but only a VSWR meter.
An antenna analyser must be able to measure with accuracy the real part and
the imaginary part of the impedance i.e. the resistive and the reactive part
of the impedance Z = R +/- jX
For example the same antenna VSWR of 1.5 : 1 can be obtained with an
antenna impedance having the following values and all of them are laying
over the same VSWR circle of the Smith Chart
Z1 = 38+j13 ohm
Z2 = 66+j16 ohm
Z3 = 58- j20 ohm
Z4 = 34- j0 ohm
Since the same VSWR can be found over a VSWR circle then the values
of the impedance giving the same VSWR are infinite values.
The MFJ-269 analyser make acceptable R +/-jX measurements only up to
30 MHz but fail to measure accurate resistive and reactive part of the
impedance above 30 MHz and in other words it is not a respectable antenna
analyser.
Why to wast money to buy an antenna analyser to measure wrong values of
Z= R+/- jX if been happy with only the value of the VSWR you need only a
VSWR meter ?
73" de
i8CVS Domenico
----- Original Message -----
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'i8cvs'" <domenico.i8cvs@xxx.xx>; "'Pete Rowe'" <ptrowe@xxxxx.xxx>;
"'AMSAT BB'" <amsat-bb@xxxxx.xxx>; "'Howard Kowall'" <hkowall@xxxx.xx>
Sent: Sunday, March 06, 2011 7:38 PM
Subject: RE: [amsat-bb] Re: Antenna Analyzer
> Domenico,
>
> For most Amateur Radio work a VSWR of 1.5:1 is adequate. I personally have
> never expected MFJ products to be in the League of Anristu, HP and Rohde
and
> Swartz.
> MFJ is a yard stick, the others are a micrometers
> Art,
> KC6UQH
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of i8cvs
> Sent: Sunday, March 06, 2011 9:41 AM
> To: Pete Rowe; AMSAT BB; Howard Kowall
> Subject: [amsat-bb] Re: Antenna Analyzer
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers
and
> I have found that at most the MFJ is usable up to 30 MHz maximum because
> above 30 MHz the inaccuracy on the real part and the imaginary part of the
> impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting and calibration but
I
> belive that the above instrument was a very bad affair for me and will be
a
> bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 4:45 PM
> Subject: [amsat-bb] Re: Antenna Analyzer
>
>
> Hi Howard
> I wouldn't be without my MFJ-269 analyzer. It is very accurate and a handy
> size. Highly recommended. (no, I don't own stock in MFJ)
> One word of caution: mine (and maybe there is something wrong with mine)
> draws some power from the batteries with the power switch OFF. So I take
one
> of the batteries out when not in use.
>
> 73,
> Pete
> WA6WOA
>
> --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
>
> From: Howard Kowall <hkowall@xxxx.xx>
> Subject: [amsat-bb] Antenna Analyzer
> To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> Date: Sunday, March 6, 2011, 6:16 AM
>
> Hello to everyone
> I am seriously thinking about buying an antenna analyzer,I build enough
> antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of all
> flavors.The standard swr bridge is just not cutting it anymore.So I guess
> what I am looking for is one that will do 3mhz to 500mhz,nice to have
> computer interface but not a priority.I have seen a few on the internet
but
> its nice to get some user input,rather then the sales pitches.
> Thanks to all who read and reply in advance
> Howard
> VE4ISP
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> __________ Information from ESET NOD32 Antivirus, version of virus
signature
> database 5929 (20110305) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
signature
> database 5931 (20110306) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 5931 (20110306) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 5931 (20110306) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
------------------------------
Message: 8
Date: Mon, 7 Mar 2011 04:43:18 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: <kc6uqh@xxx.xxx>, "'Pete Rowe'" <ptrowe@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>, "'Howard Kowall'" <hkowall@xxxx.xx>
Message-ID: <005201cbdc79$ccded420$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'i8cvs'" <domenico.i8cvs@xxx.xx>; "'Pete Rowe'" <ptrowe@xxxxx.xxx>;
"'AMSAT BB'" <amsat-bb@xxxxx.xxx>; "'Howard Kowall'" <hkowall@xxxx.xx>
Sent: Monday, March 07, 2011 2:38 AM
Subject: RE: [amsat-bb] Re: Antenna Analyzer
> Domenico,
>
> A. It is much smaller than MY H/P 8410 + 8414 + test set, & sweep
> generator.
Hi Art, KC6UQH
I agree that the MFJ-269 is smaller than your above banch set-up
> B. It will tell me if the resistive arm is above or below 50 Ohms.
Only it tell you the resistive part R of the impedance up to 30 MHz
but the instrument is sold to measure R up to 170 MHz
> C. It will give me the reactance Vs frequency with in 10 ohms.
Only it tell you the inductive reactance +jX up to 30 MHz but the
instrument is sold to measure +jX up to 170 MHz
> D. It is battery operated, portable, and can be used on a tower.
When you are on the tower with your MFJ-269 you can adjust the
antenna for the lovest VSWR only looking at the VSWR on display
without exactly know Z = R+/-jX above 30 MHz and so a more
simple VSWR meter does the same job.
> E. It costs less than a 1 month rental of a quality Network Analyzer.
I agree
> F. A VSWR measurement will not separate the resistive and reactive arms
I agree and this is why for a given VSWR we need an antenna analyser capable
to measure the value of the resistive part R and the reactive part +jX
or -jX of the impedance particularly when we are over the tower to adjust
the matching system and cancel out the inductive or the capacitive part of
the impedance.
Using the MFJ-269 if you don't look at the VSWR but you look only at R and
+jX or -jX being on the tower it is like to drive a car above 30 MHz without
to know if rotating the wheel you will go to left or right on the road !
> G. When tuning an antenna you never start at 1.5 :1!If it is that good
> there is no need to tune it.
To tune an antenna you don't need mandatorily an antenna analyser but only
you need a VSWR meter to move the maching arness for the lovest VSWR
An antenna analyser is indeed needed only to cut or prolong in advance
stubs and matching lines or antenna elements to get a matching as close as
possible to 50 ohm resistive and 0 ohm reactive i.e to get an impedance
as close as possible to Z = 50 + j0 ohm but unfortunately the MFJ-269
does satisfactorily this job only up to 30 MHz !
>
> 73,
> Art,
> KC6UQH
73" de
i8CVS Domenico
>
> -----Original Message-----
> From: i8cvs [mailto:domenico.i8cvs@xxx.xxx
> Sent: Sunday, March 06, 2011 12:30 PM
> To: kc6uqh@xxx.xxxx 'Pete Rowe'; 'AMSAT BB'; 'Howard Kowall'
> Subject: Re: [amsat-bb] Re: Antenna Analyzer
>
> Hi Art, KC6UQH
>
> If you are satisfied with an antenna VSWR in the order of 1.5 : 1 then
> you don't need an antenna analyser but only a VSWR meter.
>
> An antenna analyser must be able to measure with accuracy the real part
and
> the imaginary part of the impedance i.e. the resistive and the reactive
part
> of the impedance Z = R +/- jX
>
> For example the same antenna VSWR of 1.5 : 1 can be obtained with an
> antenna impedance having the following values and all of them are laying
> over the same VSWR circle of the Smith Chart
>
> Z1 = 38+j13 ohm
> Z2 = 66+j16 ohm
> Z3 = 58- j20 ohm
> Z4 = 34- j0 ohm
>
> Since the same VSWR can be found over a VSWR circle then the values
> of the impedance giving the same VSWR are infinite values.
>
> The MFJ-269 analyser make acceptable R +/-jX measurements only up to
> 30 MHz but fail to measure accurate resistive and reactive part of the
> impedance above 30 MHz and in other words it is not a respectable antenna
> analyser.
>
> Why to wast money to buy an antenna analyser to measure wrong values of
> Z= R+/- jX if been happy with only the value of the VSWR you need only a
> VSWR meter ?
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Art McBride" <kc6uqh@xxx.xxx>
> To: "'i8cvs'" <domenico.i8cvs@xxx.xx>; "'Pete Rowe'" <ptrowe@xxxxx.xxx>;
> "'AMSAT BB'" <amsat-bb@xxxxx.xxx>; "'Howard Kowall'" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 7:38 PM
> Subject: RE: [amsat-bb] Re: Antenna Analyzer
>
>
> > Domenico,
> >
> > For most Amateur Radio work a VSWR of 1.5:1 is adequate. I personally
have
> > never expected MFJ products to be in the League of Anristu, HP and Rohde
> and
> > Swartz.
> > MFJ is a yard stick, the others are a micrometers
> > Art,
> > KC6UQH
> > -----Original Message-----
> > From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> > Behalf Of i8cvs
> > Sent: Sunday, March 06, 2011 9:41 AM
> > To: Pete Rowe; AMSAT BB; Howard Kowall
> > Subject: [amsat-bb] Re: Antenna Analyzer
> >
> > Hi Pete, WA6WOA
> >
> > I do not recommend the MFJ-269 antenna analyser because it is very
> > inaccurate particularly on 435 MHz
> > I have compared the MFJ-269 with several professional network analysers
> and
> > I have found that at most the MFJ is usable up to 30 MHz maximum because
> > above 30 MHz the inaccuracy on the real part and the imaginary part of
the
> > impedance reading becomes absolutely unacceptable.
> >
> > My MFJ-269 was purchased as new but connecting to it a professional
> > 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> > was 1.1
> >
> > I have sent back my MFJ to the factory for inspecting and calibration
but
> I
> > belive that the above instrument was a very bad affair for me and will
be
> a
> > bad affair for all that intend to use the analyser above 30 MHz.
> >
> > Be happy with your MFJ-269 even if dreaming while sleeping I am sure
that
> > my message made you suspect a wrong real part and a wrong imaginary part
> > on your impedance reading !
> >
> > Best 73" de
> >
> > i8CVS Domenico
> >
> > ----- Original Message -----
> > From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> > To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> > Sent: Sunday, March 06, 2011 4:45 PM
> > Subject: [amsat-bb] Re: Antenna Analyzer
> >
> >
> > Hi Howard
> > I wouldn't be without my MFJ-269 analyzer. It is very accurate and a
handy
> > size. Highly recommended. (no, I don't own stock in MFJ)
> > One word of caution: mine (and maybe there is something wrong with mine)
> > draws some power from the batteries with the power switch OFF. So I take
> one
> > of the batteries out when not in use.
> >
> > 73,
> > Pete
> > WA6WOA
> >
> > --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
> >
> > From: Howard Kowall <hkowall@xxxx.xx>
> > Subject: [amsat-bb] Antenna Analyzer
> > To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> > Date: Sunday, March 6, 2011, 6:16 AM
> >
> > Hello to everyone
> > I am seriously thinking about buying an antenna analyzer,I build enough
> > antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of
all
> > flavors.The standard swr bridge is just not cutting it anymore.So I
guess
>
> > what I am looking for is one that will do 3mhz to 500mhz,nice to have
> > computer interface but not a priority.I have seen a few on the internet
> but
> > its nice to get some user input,rather then the sales pitches.
> > Thanks to all who read and reply in advance
> > Howard
> > VE4ISP
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
> > __________ Information from ESET NOD32 Antivirus, version of virus
> signature
> > database 5929 (20110305) __________
> >
> > The message was checked by ESET NOD32 Antivirus.
> >
> > http://www.eset.com
> >
> >
> >
> >
> > __________ Information from ESET NOD32 Antivirus, version of virus
> signature
> > database 5931 (20110306) __________
> >
> > The message was checked by ESET NOD32 Antivirus.
> >
> > http://www.eset.com
> >
> >
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
signature
> database 5931 (20110306) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
signature
> database 5931 (20110306) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
------------------------------
Message: 9
Date: Mon, 7 Mar 2011 04:56:33 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Antenna Analyzer
To: <kc6uqh@xxx.xxx>, "'Pete Rowe'" <ptrowe@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>, "'Howard Kowall'" <hkowall@xxxx.xx>
Message-ID: <007901cbdc7b$a62323c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Art, KC6UQH
If you are satisfied with an antenna VSWR in the order of 1.5 : 1 then
you don't need an antenna analyser but only a VSWR meter.
An antenna analyser must be able to measure with accuracy the real part and
the imaginary part of the impedance i.e. the resistive and the reactive part
of the impedance Z = R +/- jX
For example the same antenna VSWR of 1.5 : 1 can be obtained with an
antenna impedance having the following values and all of them are laying
over the same VSWR circle of the Smith Chart
Z1 = 38+j13 ohm
Z2 = 66+j16 ohm
Z3 = 58- j20 ohm
Z4 = 34- j0 ohm
Since the same VSWR can be found over a VSWR circle then the values
of the impedance giving the same VSWR are infinite values.
The MFJ-269 analyser make acceptable R +/-jX measurements only up to
30 MHz but fail to measure accurate resistive and reactive part of the
impedance above 30 MHz and in other words it is not a respectable antenna
analyser.
Why to wast money to buy an antenna analyser to measure wrong values of
Z= R+/- jX if been happy with only the value of the VSWR you need only a
VSWR meter ?
73" de
i8CVS Domenico
> ----- Original Message -----
> From: "Art McBride" <kc6uqh@xxx.xxx>
> To: "'i8cvs'" <domenico.i8cvs@xxx.xx>; "'Pete Rowe'" <ptrowe@xxxxx.xxx>;
> "'AMSAT BB'" <amsat-bb@xxxxx.xxx>; "'Howard Kowall'" <hkowall@xxxx.xx>
> Sent: Sunday, March 06, 2011 7:38 PM
> Subject: RE: [amsat-bb] Re: Antenna Analyzer
>
>
> Domenico,
>
> For most Amateur Radio work a VSWR of 1.5:1 is adequate. I personally have
> never expected MFJ products to be in the League of Anristu, HP and Rohde
> and Swartz.
> MFJ is a yard stick, the others are a micrometers
> Art,
> KC6UQH
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of i8cvs
> Sent: Sunday, March 06, 2011 9:41 AM
> To: Pete Rowe; AMSAT BB; Howard Kowall
> Subject: [amsat-bb] Re: Antenna Analyzer
>
> Hi Pete, WA6WOA
>
> I do not recommend the MFJ-269 antenna analyser because it is very
> inaccurate particularly on 435 MHz
> I have compared the MFJ-269 with several professional network analysers
> and I have found that at most the MFJ is usable up to 30 MHz maximum
> because above 30 MHz the inaccuracy on the real part and the imaginary
> part of the impedance reading becomes absolutely unacceptable.
>
> My MFJ-269 was purchased as new but connecting to it a professional
> 50 ohm termination good up to 12 GHz the VSWR shown at 435 MHz
> was 1.1
>
> I have sent back my MFJ to the factory for inspecting and calibration but
> I belive that the above instrument was a very bad affair for me and will
> be a bad affair for all that intend to use the analyser above 30 MHz.
>
> Be happy with your MFJ-269 even if dreaming while sleeping I am sure that
> my message made you suspect a wrong real part and a wrong imaginary part
> on your impedance reading !
>
> Best 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> > From: "Pete Rowe" <ptrowe@xxxxx.xxx>
> > To: "AMSAT BB" <amsat-bb@xxxxx.xxx>; "Howard Kowall" <hkowall@xxxx.xx>
> > Sent: Sunday, March 06, 2011 4:45 PM
> > Subject: [amsat-bb] Re: Antenna Analyzer
> >
> >
> > Hi Howard
> > I wouldn't be without my MFJ-269 analyzer. It is very accurate and a
> > handy size. Highly recommended. (no, I don't own stock in MFJ)
> > One word of caution: mine (and maybe there is something wrong with mine)
> > draws some power from the batteries with the power switch OFF. So I take
> > one of the batteries out when not in use.
> >
> > 73,
> > Pete
> > WA6WOA
> >
> > --- On Sun, 3/6/11, Howard Kowall <hkowall@xxxx.xx> wrote:
> >
> > From: Howard Kowall <hkowall@xxxx.xx>
> > Subject: [amsat-bb] Antenna Analyzer
> > To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
> > Date: Sunday, March 6, 2011, 6:16 AM
> >
> > Hello to everyone
> > I am seriously thinking about buying an antenna analyzer,I build enough
> > antennas to justify buying one.I enjoy building HF,VHF,UHF antennas of
> > all flavors.The standard swr bridge is just not cutting it anymore.So I
> > guess what I am looking for is one that will do 3mhz to 500mhz,nice to
> > have computer interface but not a priority.I have seen a few on the
> > internet but its nice to get some user input,rather then the sales
> > pitches.
> > Thanks to all who read and reply in advance
> > Howard
> > VE4ISP
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> > program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 6, Issue 143
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