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CX2SA > SATDIG 28.03.08 19:00l 812 Lines 26527 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Easy to make, low cost omni-directional antennae
(Tony Langdon)
2. Re: Programming software for TH-D7AG (Jeff Yanko)
3. Re: Easy to make, low cost omni-directional antennae
(Bill Dzurilla)
4. UT1FG/mm still in the Algerian port of Annaba (Robert Turlington)
5. MANCHESTER encosing schemes (RFI-EMI-GUY)
6. Re: Easy to make, low cost omni-directional antennae (Jeff Mock)
7. Re: UT1FG/mm still in the Algerian port of Annaba (i8cvs)
8. Re: Easy to make, low cost omni-directional antennae
(Tony Langdon)
9. Re: Easy to make, low cost omni-directional antennae
(Bill Dzurilla)
10. Re: Easy to make, low cost omni-directional antennae
(Anthony Monteiro)
11. Re: MANCHESTER encosing schemes (RFI-EMI-GUY)
12. Re: [SPAM] MANCHESTER encosing schemes (Andrew Rich)
13. QSL CARD EXCHANGE (Stuart Underwood)
14. Re: Easy to make, low cost omni-directional antennae
(Edward Cole)
15. Re: QSL CARD EXCHANGE (Jim Walls)
16. Re: Easy to make, low cost omni-directional antennae (john heath)
17. Re: Easy to make, low cost omni-directional antennae
(Bruce Robertson)
----------------------------------------------------------------------
Message: 1
Date: Fri, 28 Mar 2008 07:12:00 +1100
From: Tony Langdon <vk3jed(AT)gmail.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: Bill Dzurilla <billdz.geo(AT)yahoo.com>, amsat-bb(AT)amsat.org
Message-ID: <47ebffa0.0786460a.2c70.2735(AT)mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 06:17 AM 3/28/2008, Bill Dzurilla wrote:
>Have not tried the Lindenblad. Not many are using it
>or talking about it, so I doubt it is all that great.
>Same for the turnstile.
The Lindenblad is said to be quite good, but requires a bit more
mechanical work to build.
>I do far better with a 5w HT and a handheld Arrow than
>I do with an IC-7000, ARR preamp, and any of the omnis
>I have tried. However, unlike some people, I don't
A directional antenna really does improve things on 70cm.
>If you do go omni, get it high enough to be in the
>clear. And unless you get a preamp, use very good
>coax and keep the line as short as possible. You can
>get a 70cm receive-only preamp from Ramsey Electronics
>for $17, but with that you'll need a separate coax
>line for the 2m uplink, or a duplexer. The ARR is the
>cheapest RF switching preamp and it's over $125.
I wouldn't bother with a switching preamp, unless you're planning on
using the omni for transmitting (e.g. for working the ISS
repeater). You certainly don't need a switching preamp to work any
of the Mode J birds, because the uplink is on a different band, and
you want full duplex capability if you can have it. In any case, a
good masthead preamp is a must for omnis.
>I also homebrewed one of Kent's dual band LEO cheap
>yagis, see
>http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf.
>It can be built for $10 and it works as good or better
>than the far more expensive expensive Arrow, although
I have had a lot of success with a homebrew directional
antenna. Only reason I would consider an Arrow is for the
portability as you mention.
>Have not tried this, but I'm almost certain that a
>cheap yagi mounted at a fixed 20-30 degree elevation
>and rotated with an old TV rotator will be less
>expensive and give substantially better results than
>any omni, even an omni with a preamp.
I have heard this can work well, though I've never tried it. You
will want to make sure that the Yagi only has moderate gain, as you
will need a fairly wide pattern, so that the satellite can still be
on the edge of the main lobe at high elevation.
73 de VK3JED
http://vkradio.com
------------------------------
Message: 2
Date: Thu, 27 Mar 2008 13:16:33 -0700
From: "Jeff Yanko" <wb3jfs(AT)cox.net>
Subject: [amsat-bb] Re: Programming software for TH-D7AG
To: "Robert Morales" <wp4bqv(AT)gmail.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <000501c89047$73a52660$6501a8c0(AT)QUECREEK>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
FB on the USB ports. All of my computers have both USB and serial so I'm
covered either way.
73,
Jeff WB3JFS
----- Original Message -----
From: "Robert Morales" <wp4bqv(AT)gmail.com>
To: "Jeff Yanko" <wb3jfs(AT)cox.net>
Cc: <amsat-bb(AT)amsat.org>
Sent: Thursday, March 27, 2008 7:29 AM
Subject: Re: [amsat-bb] Programming software for TH-D7AG
> Worked fine for me under XP and Win2K. There are two caveats however,
> if you have a PC with only USB ports and you use a USB to serial
> adapter, the Kenwood software has a limited number of COM ports that
> can be mapped (if I recall only COM1-4). On some laptops, USB
> adapters for serial use enumerate as COM5 or higher. The other caveat
> is making sure you have the right version of software for the model of
> TH-D7 you have. If I remember, Kenwood has two versions of software
> posted. One that works with the TH-D7(G) only and one for the earlier
> version of hardware.
>
> 73s de Bob, WP4BQV.
>
>
>
> On Thu, Mar 27, 2008 at 12:54 AM, Jeff Yanko <wb3jfs(AT)cox.net> wrote:
>> Hi all,
>>
>> I noticed on the Kenwood site that they offer free programming software
>> for
>> all of their HT's. I was very surprised to read in fine print that the
>> software may not work under the Windows NT 4.0 or XP platforms. Has
>> anybody
>> tried this software under XP. How did it function? Any problems?
>>
>> 73,
>>
>> Jeff WB3JFS
>>
>>
>>
>> _______________________________________________
>> Sent via AMSAT-BB(AT)amsat.org. 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
>>
>
>
>
> --
> R. L. Morales, WP4BQV
> wp4bqv(AT)gmail.com
> http://journals.aol.com/wp4bqv/RadioIntercepts/
> Echolink node# 165727
> APRS mobile: WP4BQV-7
> "Absence of evidence is not evidence of absence." - Carl Sagan
>
------------------------------
Message: 3
Date: Thu, 27 Mar 2008 13:28:19 -0700 (PDT)
From: Bill Dzurilla <billdz.geo(AT)yahoo.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: Tony Langdon <vk3jed(AT)gmail.com>, amsat-bb(AT)amsat.org
Message-ID: <376966.70933.qm(AT)web51105.mail.re2.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Good points, Tony.
> I wouldn't bother with a switching preamp, unless
> you're planning on
> using the omni for transmitting (e.g. for working
> the ISS
> repeater). You certainly don't need a switching
> preamp to work any
> of the Mode J birds, because the uplink is on a
> different band, and
> you want full duplex capability if you can have it.
>
Of course, you can't use a receive only preamp if you
use a dual band antenna with a single feedline, or if
you want to use the 70 cm antenna for local repeaters,
for working the ISS repeater, VO-52, or AO-7 mode B,
or for any type of 70 cm transmission at all. But if
you have an antenna that can be devoted exclusively to
70 cm reception, it will do fine and will be a lot
cheaper than a switching preamp.
73,
Bill NZ5N
______________________________________________________________________________
______
Looking for last minute shopping deals?
Find them fast with Yahoo! Search.
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------------------------------
Message: 4
Date: Thu, 27 Mar 2008 21:38:53 +0000
From: Robert Turlington <rob_g8ate(AT)hotmail.com>
Subject: [amsat-bb] UT1FG/mm still in the Algerian port of Annaba
To: Amsat Buleitin Board <amsat-bb(AT)amsat.org>
Message-ID: <BAY134-W3415C167ED0F37005D2B62C0FE0(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hi All
Since my last report a few days ago I have had one or two QSO's on AO16/AO27
withYuri UT1FG/mm and he is still in the Algerian Port of Annaba JM36VVRegards
Robert G8ATE
_________________________________________________________________
Amazing prizes every hour with Live Search Big Snap
http://www.bigsnapsearch.com
------------------------------
Message: 5
Date: Thu, 27 Mar 2008 17:48:53 -0400
From: RFI-EMI-GUY <Rhyolite(AT)nettally.com>
Subject: [amsat-bb] MANCHESTER encosing schemes
To: amsat-bb(AT)amsat.org
Message-ID: <47EC1645.3050903(AT)NETTALLY.COM>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Can anyone point me to some simple schemes for Manchester encoding and
decoding. The application would be for high speed data over a low cost
ISM link (manufacturer advises against long strings of data in 111 or 000's)
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"?
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
------------------------------
Message: 6
Date: Thu, 27 Mar 2008 15:43:44 -0700
From: Jeff Mock <jeff(AT)mock.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <47EC2320.7090803(AT)mock.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Tony Langdon wrote:
> At 06:17 AM 3/28/2008, Bill Dzurilla wrote:
> I wouldn't bother with a switching preamp, unless you're planning on
> using the omni for transmitting (e.g. for working the ISS
> repeater). You certainly don't need a switching preamp to work any
> of the Mode J birds, because the uplink is on a different band, and
> you want full duplex capability if you can have it. In any case, a
> good masthead preamp is a must for omnis.
>
I like having a switching preamp because I'm an idiot. I'm always
moving stuff around, I'll get a crazy idea to work a local 70cm repeater
or whatever. I would have certainly blown up a receive-only preamp
5-times over by now, even though I rarely use the switching part.
jeff
AD6EO
------------------------------
Message: 7
Date: Thu, 27 Mar 2008 23:59:23 +0100
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: UT1FG/mm still in the Algerian port of Annaba
To: "Robert Turlington" <rob_g8ate(AT)hotmail.com>, "Amsat Buleitin
Board" <amsat-bb(AT)amsat.org>
Message-ID: <001701c8905e$337b3fe0$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Robert Turlington" <rob_g8ate(AT)hotmail.com>
To: "Amsat Buleitin Board" <amsat-bb(AT)amsat.org>
Sent: Thursday, March 27, 2008 10:38 PM
Subject: [amsat-bb] UT1FG/mm still in the Algerian port of Annaba
>
> Hi All
> Since my last report a few days ago I have had one or two QSO's on
AO16/AO27 withYuri UT1FG/mm and he is still in the Algerian Port of Annaba
JM36VVRegards Robert G8ATE
> _________________________________________________________________
Hi Robert, G8ATE
I also have had a nice SSB QSO with Yuri UT1FG/mm via VO-52 on march 25
orbit 15626 when he was in JM36VV
73" de i8CVS Domenico
------------------------------
Message: 8
Date: Fri, 28 Mar 2008 10:32:40 +1100
From: Tony Langdon <vk3jed(AT)gmail.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: Jeff Mock <jeff(AT)mock.com>, "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <47ec2e9f.22035a0a.227f.2662(AT)mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 09:43 AM 3/28/2008, Jeff Mock wrote:
>I like having a switching preamp because I'm an idiot. I'm always
>moving stuff around, I'll get a crazy idea to work a local 70cm repeater
>or whatever. I would have certainly blown up a receive-only preamp
>5-times over by now, even though I rarely use the switching part.
For idiot proofing, the switching preamp is a good idea. :)
73 de VK3JED
http://vkradio.com
------------------------------
Message: 9
Date: Thu, 27 Mar 2008 17:33:43 -0700 (PDT)
From: Bill Dzurilla <billdz.geo(AT)yahoo.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: Bill Dzurilla <billdz.geo(AT)yahoo.com>, Tony Langdon
<vk3jed(AT)gmail.com>, amsat-bb(AT)amsat.org
Message-ID: <342705.16440.qm(AT)web51102.mail.re2.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
With the receive-only preamp at $17 and the switching
preamp at $125, you could blow up six of the receive
onlies and still be ahead on cost.
I use a switching preamp because I use the same 70 cm
antenna to work VO-52, AO-7 and the local repeaters.
Would have been cheaper to use a receive-only preamp
with one antenna dedicated to the FM LEOs and put up a
seperate 70 cm transmit antenna for the other
purposes. But probably the piece of mind is worth the
extra money.
73, Bill NZ5N
At 09:43 AM 3/28/2008, Jeff Mock wrote:
>I like having a switching preamp because I'm an
idiot. I'm always
>moving stuff around, I'll get a crazy idea to work a
local 70cm repeater
>or whatever. I would have certainly blown up a
receive-only preamp
>5-times over by now, even though I rarely use the
switching part.
For idiot proofing, the switching preamp is a good
idea. :)
73 de VK3JED
http://vkradio.com
______________________________________________________________________________
______
Looking for last minute shopping deals?
Find them fast with Yahoo! Search.
http://tools.search.yahoo.com/newsearch/category.php?category=shopping
------------------------------
Message: 10
Date: Thu, 27 Mar 2008 21:18:04 -0400
From: Anthony Monteiro <aa2tx(AT)comcast.net>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: Bill Dzurilla <billdz.geo(AT)yahoo.com>, amsat-bb(AT)amsat.org
Message-ID: <20080328011825.83S1IP800E8D6(AT)mailbox5.ucsd.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 03:17 PM 3/27/2008, Bill Dzurilla wrote:
>I have just been involved with the sats since February
>and also wanted an omni for base station use
...
>Have not tried the Lindenblad. Not many are using it
>or talking about it, so I doubt it is all that great.
Dear Friends,
I want to help remove any doubt.
You cannot buy a Lindenblad for the ham bands.
That is a major reason why that they are not so popular.
In terms of performance though, a few data points may
help illustrate. This snapshot is for 2m antennas
mounted at 6' elevation (like I do for field day)
1. At 5 degrees elevation, a Lindy has about 5 dB
higher gain to satellites with circular polarization
versus an eggbeater. That is pretty significant if
you want to work max DX. Of course mounting
the antennas higher will also help.
2. At 15 degrees elevation, the Lindenblad is only about
+2 dB higher gain than an eggbeater for circularly polarized
satellites (mostly insignificant.) But...
3. at the same 15 degrees, on satellites with linearly polarized
antennas, a Lindenblad will show only about 5 dB max fading from
polarization mismatch versus nearly 25 dB max fading using
an eggbeater. That is pretty significant.
So, the eggbeater is probably the best omni antenna you
can buy for working DX on the LEO satellites.
But, in terms of performance, the Lindenblad is a
better antenna if you are willing to build one.
73,
Tony AA2TX
------------------------------
Message: 11
Date: Thu, 27 Mar 2008 23:49:21 -0400
From: RFI-EMI-GUY <Rhyolite(AT)nettally.com>
Subject: [amsat-bb] Re: MANCHESTER encosing schemes
To: Jim Sanford <wb4gcs(AT)amsat.org>, amsat-bb(AT)amsat.org
Message-ID: <47EC6AC1.8040800(AT)NETTALLY.COM>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks Jim!
Jim Sanford wrote:
>
> See Embedded Systems Design for Feb 2008. www.embedded.com
> 73 and good luck!
> Jim
> wb4gcs(AT)amsat.org
>
>
> RFI-EMI-GUY wrote:
>> Can anyone point me to some simple schemes for Manchester encoding
>> and decoding. The application would be for high speed data over a low
>> cost ISM link (manufacturer advises against long strings of data in
>> 111 or 000's)
>>
>>
>
>
>
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"?
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
------------------------------
Message: 12
Date: Fri, 28 Mar 2008 13:53:15 +1000
From: "Andrew Rich" <vk4tec(AT)people.net.au>
Subject: [amsat-bb] Re: [SPAM] MANCHESTER encosing schemes
To: <Rhyolite(AT)nettally.com>, <amsat-bb(AT)amsat.org>
Message-ID: <00a801c89087$409cc620$6501a8c0(AT)home7bfc9638a1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I use the easyradio modules
Do it all for you
----- Original Message -----
From: "RFI-EMI-GUY" <Rhyolite(AT)nettally.com>
To: <amsat-bb(AT)amsat.org>
Sent: Friday, March 28, 2008 7:48 AM
Subject: [SPAM] [amsat-bb] MANCHESTER encosing schemes
Can anyone point me to some simple schemes for Manchester encoding and
decoding. The application would be for high speed data over a low cost
ISM link (manufacturer advises against long strings of data in 111 or 000's)
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"?
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: 13
Date: Thu, 27 Mar 2008 20:24:39 -0700 (PDT)
From: Stuart Underwood <w8stu(AT)att.net>
Subject: [amsat-bb] QSL CARD EXCHANGE
To: AMSAT BB <amsat-bb(AT)amsat.org>
Message-ID: <903410.88674.qm(AT)web83829.mail.sp1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Greetings,
I have a question about exchanging QSL cards. When the last time the ISS
xband repeater was up I made seven contacts. I was very excited because this
was the first time I was able to work satellites. Very anxious, I sent out
seven QSL cards. Waiting to get some back. I received only one. My
questions is, is there a protocol for sending and receiving QSL cards for
satellite work? When I get better, I would like to try for VUCC... Thanks
in advance. 73, Stuart W8STU EN91
------------------------------
Message: 14
Date: Thu, 27 Mar 2008 21:40:10 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: amsat-bb(AT)amsat.org
Message-ID: <200803280540.m2S5eA93078260(AT)malik.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 11:17 AM 3/27/2008, Bill Dzurilla wrote:
>I have just been involved with the sats since February
>and also wanted an omni for base station use. I
>started with a simple 1/4 wave ground plane (19" for
>2m, 6 1/2" for 70 cm), later tried homebrewing Jerry's
>Eggbeater II, and then bought a second-hand M2
>eggbeater and the ARR preamp. I noticed little or no
>difference between the 3 antennas, certainly not
>enough to justify the relatively high price of a new
>M2 eggbeater. The preamp helps a lot but, as Jeff
>says, SO-50 is still quite weak.
For a simple omni the 19-inch ground plane works as a 1/4 or 3/4
wavelength vertical on either 2m or 70cm respectively. I used one
with a P432 ARR preamp ($79.95) to record AO-51 telemetry very
well. This is a plain GasFet preamp with 0.5 dB NF so do not
transmit into it. The 25w switching ARR preamp is worth the piece of
mind in that respect. I think you get much better low noise
performance with ARR over the cheaper preamps.
>Have not tried the Lindenblad. Not many are using it
>or talking about it, so I doubt it is all that great.
>Same for the turnstile.
I am thinking to build a set of these antennas for non-tracking
use. Tony AA2TX design looks good.
(http://www.arrl.org/qst/2007/08/monteiro.pdf).
>I do far better with a 5w HT and a handheld Arrow than
>I do with an IC-7000, ARR preamp, and any of the omnis
>I have tried. However, unlike some people, I don't
>really enjoy standing in the yard holding the Arrow
>antenna for 15 minutes. So I usually work from
>inside.
>
>If you do go omni, get it high enough to be in the
>clear. And unless you get a preamp, use very good
>coax and keep the line as short as possible. You can
>get a 70cm receive-only preamp from Ramsey Electronics
>for $17, but with that you'll need a separate coax
>line for the 2m uplink, or a duplexer. The ARR is the
>cheapest RF switching preamp and it's over $125.
>
>I also homebrewed one of Kent's dual band LEO cheap
>yagis, see
>http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf.
>It can be built for $10 and it works as good or better
>than the far more expensive expensive Arrow, although
>it's not quite as portable. As Jeff mentioned, the
>Arrow unscrews into very small pieces and fits in a
>suitcase, very nice for air travel. The cheap yagi
>elements are glued to the wood boom, will fit into a
>car trunk but is not suitable for air travel, unless
>someone comes up with a different way to attach the
>elements to the boom that allows easy removal.
>
>Have not tried this, but I'm almost certain that a
>cheap yagi mounted at a fixed 20-30 degree elevation
>and rotated with an old TV rotator will be less
>expensive and give substantially better results than
>any omni, even an omni with a preamp.
For couple years I had the 2m portion of my Arrow installed on az-el
rotator and it worked well. I would recommend the fixed elevation
short yagi as next better than an omni for simplicity with Leo
sats. Either an Arrow or home-built will work.
I have the full AO-10/13 long x-yagi's on az-el rotator for the next
Heo, but for simpler Leo operation the small fixed rotator or
Lindenblad are fine.
*****************************************************
73, Ed - KL7UW BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 185w
http://www.kl7uw.com AK VHF-Up Group
NA Rep. for DUBUS: dubususa(AT)hotmail.com
*****************************************************
------------------------------
Message: 15
Date: Thu, 27 Mar 2008 22:52:00 -0700
From: Jim Walls <jim(AT)k6ccc.org>
Subject: [amsat-bb] Re: QSL CARD EXCHANGE
To: Amsat-BB <amsat-bb(AT)amsat.org>
Message-ID: <47EC8780.1090207(AT)k6ccc.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Stuart Underwood wrote:
> Greetings,
>
> I have a question about exchanging QSL cards. When the last time the ISS
xband repeater was up I made seven contacts. I was very excited because this
was the first time I was able to work satellites. Very anxious, I sent out
seven QSL cards. Waiting to get some back. I received only one. My
questions is, is there a protocol for sending and receiving QSL cards for
satellite work? When I get better, I would like to try for VUCC... Thanks
in advance. 73, Stuart W8STU EN91
Unfortunately fewer and fewer hams are willing to send QSL cards. I
will always send a card if requested, and would usually send a card if
it was to someone I had never worked on satellite. Also if it was
something special for one or the other of us.
When I was trying to finish my satellite VUCC, it took some effort to
get the last few card.
Satelllite VUCC #108
--
73
-------------------------------------
Jim Walls - K6CCC
jim(AT)k6ccc.org
Ofc: 818-548-4804
http://home.earthlink.net/~k6ccc
AMSAT Member 32537 - WSWSS Member 395
------------------------------
Message: 16
Date: Fri, 28 Mar 2008 10:21:16 -0000
From: "john heath" <g7hia(AT)btinternet.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <001c01c890bd$75de49e0$4001a8c0(AT)MainPC>
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Hi,
I don't have the test data but confirm the excellent receive performance of
the Lindenblad with the 70cm downlink satellites.
The first one I made was using the classic 4x folded dipole method as shown
in Satellite Experimenters Handbook by K2UBC.
Made a wooden jig so that all the folded dipoles were the same. Worked well,
but was tricky to build due to the phasing harness.
The second one was Tony AA2TX's design which he described as a Parasitic
Lindy. No phasing harness and much easier to build.
With a good pre amp (a kit from G0MRF) I could copy the 80mW cubesat beacons
at 1 degree elevation.
LO-19 beacon was very strong at low elevation with no pre amp and just a 2
meters of co-ax into an FT817.
73
John G7HIA
------------------------------
Message: 17
Date: Fri, 28 Mar 2008 08:33:37 -0300
From: "Bruce Robertson" <ve9qrp(AT)gmail.com>
Subject: [amsat-bb] Re: Easy to make, low cost omni-directional
antennae
To: "Bill Dzurilla" <billdz.geo(AT)yahoo.com>
Cc: amsat-bb(AT)amsat.org
Message-ID:
<49657a760803280433oca4d807l15c9c3684bfcd1cc(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Mar 27, 2008 at 4:17 PM, Bill Dzurilla <billdz.geo(AT)yahoo.com>
wrote:
> If you do go omni, get it high enough to be in the
> clear. And unless you get a preamp, use very good
> coax and keep the line as short as possible. You can
> get a 70cm receive-only preamp from Ramsey Electronics
> for $17, but with that you'll need a separate coax
> line for the 2m uplink, or a duplexer.
You can get such a preamp from Ramsey, but as one who has built their
preamps in hopes that they will suffice for satellite operations, I do
not recommend it. Remember that the improvement that a preamp makes
(for a given position in the receiving system) is related to the gain
and inversely to the noise figure. Gain is easy, low noise figure is
not; but without the latter you will receive more noise on 70cm, not
more signal. I would strongly recommend a ARR or SSBUSA preamp for any
beginner. Since the marginal expense is not that great, you are much
better off getting a switching model appropriate for out-of-doors use.
Get switching also because you will want to diversify into mode-B
operations, using VO-52 in particular.
I have enjoyed many Ramsey kits in the past, but my experience is that
their preamps are not designed for improving weak-signal reception on
either the VHF or UHF satellite bands.
73, Bruce
VE9QRP
------------------------------
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End of AMSAT-BB Digest, Vol 3, Issue 156
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