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CX2SA > SATDIG 12.05.09 06:55l 847 Lines 26761 Bytes #999 (0) @ WW
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Sent: 090512/0452Z @:CX2SA.LAV.URY.SA #:33374 [Minas] FBB7.00e $:33374-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
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Today's Topics:
1. Re: AO-10 Full Sun (PE0SAT)
2. Antennas (Douglas Anoman)
3. Dayton NODXA Hospitality Suite (John Papay)
4. Re: D-Star cubesat (Graham Shirville)
5. Re: D-Star cubesat (Graham Shirville)
6. AMSAT UK Oscar News (David - KG4ZLB)
7. Kenwood TS-790 w/ 1.2ghz and IF-232 for sell (R. Chastain)
8. Re: Dayton NODXA Hospitality Suite (n3tl@xxxxxxxxx.xxxx
9. Re: AMSAT UK Oscar News (Alan P. Biddle)
10. satpc32 (ANTHONY JAPHA)
11. Re: satpc32 (n3tl@xxxxxxxxx.xxxx
12. Re: satpc32 (Tim Tapio)
13. G-5500 Rotor trouble resolved. (N1HOQ)
14. Re: A word of caution - Hygain DB-218SAT Sat Antenna's
(Jim Shorney)
15. Re: satpc32 (Andrew Glasbrenner)
16. Re: satpc32 (Howard Kowall)
17. Re: A word of caution - Hygain DB-218SAT Sat Antenna's
(Gary "Joe" Mayfield)
----------------------------------------------------------------------
Message: 1
Date: Mon, 11 May 2009 21:43:48 +0200 (CEST)
From: "PE0SAT" <pe0sat@xxxxx.xx>
Subject: [amsat-bb] Re: AO-10 Full Sun
To: "Armando Mercado" <am25544@xxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<f1920e7a8502df2535a3d8410144d432.squirrel@xxxxxxx.xxxxx.xx>
Content-Type: text/plain;charset=iso-8859-1
On Mon, May 11, 2009 15:21, Armando Mercado wrote:
> Hello,
Hi,
> I listened for AO-10 10 May, 2009 at 2100UTC
> for about 45 mins. with negative results.
> Also had Spectran running and saw nothing
> that displayed a dopper shift.
What frequentie are you listening?
145.810 or 145.987 ?
>
> 73, Armando N8IGJ
>> From: "pb0ahx" <info@xxxxxx.xx>
>>
>> yes the beacon i heard him
>> last day's
>>
73's PE0SAT
------------------------------
Message: 2
Date: Mon, 11 May 2009 20:25:52 +0000
From: Douglas Anoman <danoman@xxxxx.xxxxxxxx.xxx>
Subject: [amsat-bb] Antennas
To: <amsat-bb@xxxxx.xxx>
Message-ID: <COL108-W2652DF0C598DA8AB8C9876DA630@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hello All,
i've been reading some of the e-mails about oscar antennas. Well i needed to
get a word out about Gulf alpha antennas i just received my set about five
weeks ago and I am very happy. I was going to go with M2 but price and
craftsman ship turned me away. Call Pete at gulf alpha the work is perfect and
the antenna is right on the money and cheaper than M2 and better craftsman
ship...
Thank You
Douglas Anoman
KC9MLN
Amsat #37043
------------------------------
Message: 3
Date: Mon, 11 May 2009 13:22:31 -0400
From: John Papay <k8yse@xxxxxx.xxx>
Subject: [amsat-bb] Dayton NODXA Hospitality Suite
To: amsat-bb@xxxxx.xxx
Message-ID: <200905111725.n4BHPICw027525@xxxx.xxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Everyone is invited to stop by the Northern
Ohio DX Association Hospitality Suite at the
downtown Crowne Plaza Hotel, 10th Floor on
Thursday, Friday or Saturday evening. Finger
food and beverages are available and you'll
see a lot of dx'ers and hopefully satellite
types there. Enjoy the Dayton experience!
We are all looking forward to the AMSAT
Banquet and a chance to meet Richard Garriott!
John K8YSE
Doug KD8CAO
Northern Ohio DX Association
------------------------------
Message: 4
Date: Mon, 11 May 2009 22:43:18 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: D-Star cubesat
To: <amsat-bb@xxxxx.xxx>, <g0mrf@xxx.xxx>
Message-ID: <DAD81D1CFDA640329D74A1752FF352BA@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi All,
The link below is now working again!
cheers
Graham
G3VZV
----- Original Message -----
From: <g0mrf@xxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Saturday, May 09, 2009 11:37 PM
Subject: [amsat-bb] D-Star cubesat
> Following the small satellite developers workshop in April there are a
> number of interesting papers available online.
>
> A cubesat using D-Star which has been selected for launch on the Vega
> launcher is certainly an eye catching project.
>
>
http://atl.calpoly.edu/~bklofas/Presentations/DevelopersWorkshop2009/5_Mission
s_1/7_Pisane-OUFTI.pdf
>
> Personally, my favourite so far is the 1U propulsion system capable of
> propelling a 3U cubesat with a delta V of 400 metres per second. ( This is
> enough to go from 600km to about 1900km altitude !)
>
> Have fun reading...
>
> David? G0MRF
> ________________________________________________________________________
> AOL Email goes Mobile! You can now read your AOL Emails whilst on the
> move. Sign up for a free AOL Email account with unlimited storage today.
> _______________________________________________
> 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: 5
Date: Mon, 11 May 2009 23:16:28 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: D-Star cubesat
To: <amsat-bb@xxxxx.xxx>
Message-ID: <32CBB0A4699E4C7C801536113074C17F@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
Ok lets try 3rd time lucky...
Please go to the main page and click on the particular presentation you want
to review!
http://cubesat.atl.calpoly.edu:80/pages/workshops/developers-workshop-2009.php
thanks
Graham
G3VZV
----- Original Message -----
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>; <g0mrf@xxx.xxx>
Sent: Monday, May 11, 2009 10:43 PM
Subject: Re: [amsat-bb] D-Star cubesat
> Hi All,
>
> The link below is now working again!
>
> cheers
>
> Graham
> G3VZV
>
> ----- Original Message -----
> From: <g0mrf@xxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Saturday, May 09, 2009 11:37 PM
> Subject: [amsat-bb] D-Star cubesat
>
>
>> Following the small satellite developers workshop in April there are a
>> number of interesting papers available online.
>>
>> A cubesat using D-Star which has been selected for launch on the Vega
>> launcher is certainly an eye catching project.
>>
>>
http://atl.calpoly.edu/~bklofas/Presentations/DevelopersWorkshop2009/5_Mission
s_1/7_Pisane-OUFTI.pdf
>>
>> Personally, my favourite so far is the 1U propulsion system capable of
>> propelling a 3U cubesat with a delta V of 400 metres per second. ( This
>> is enough to go from 600km to about 1900km altitude !)
>>
>> Have fun reading...
>>
>> David? G0MRF
>> ________________________________________________________________________
>> AOL Email goes Mobile! You can now read your AOL Emails whilst on the
>> move. Sign up for a free AOL Email account with unlimited storage today.
>> _______________________________________________
>> 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: Mon, 11 May 2009 18:20:43 -0400
From: David - KG4ZLB <kg4zlb@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AMSAT UK Oscar News
To: amsat bb <amsat-bb@xxxxx.xxx>
Message-ID: <4A08A4BB.1010107@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I am not sure how many members of AMSAT NA are also members of AMSAT UK
nor indeed, how many "UK" members subscribe to this board but I would
like to take the opportunity of publicly thanking Dave Johnson (G4DPZ),
Jim Heck (G3WGM) and anyone else involved in the production and
publication of AMSAT UK "Oscar News" (Number 185, March 2009) which
found its way down to me today here in deepest "ex-pat" 4 land.
A really excellent job.
73
David
--
David
KG4ZLB
www.kg4zlb.com
------------------------------
Message: 7
Date: Mon, 11 May 2009 15:29:19 -0700 (PDT)
From: "R. Chastain" <suenrod@xxxxx.xxx>
Subject: [amsat-bb] Kenwood TS-790 w/ 1.2ghz and IF-232 for sell
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <955982.172.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi all,
?
I'm selling my Kenwood TS-790 with 1.2ghz, voice module, matching SP-31
external speaker, and (NIB) IF-232 computer module.
I'm basically selling most of my gear due to failing health.
?
The TS-790 is one of the best VHF/UHF radio's ever made and will pull those
weak
signals out that others won't. If you check the reviews for this radio you
will see what I'm talking about.
?
CTCSS/PL encode is built in?so getting into tone activated systems is a snap.
The radio does not have PL decoder modules but those are still available
through 3rd party makers.
?
I have the original box for the radio but I'm not sure if I have the speaker
box.
I do have the manual but it's a bit dog eared from use.
?
Sorry, but I will not seperate the package.
?
Cosmetically, I would rate the radio an 8+ on a scale of 10 only because of a
very small scratch on the far right side of the display. If you didn't know it
was there you wouldn't know it. It's that small and light. hi hi
Also the plastic carrying handle on the side has been romoved by a previous
owner.
The screws are still there but the handle has been removed.
?
Electrically, the radio is a 10. NO problems whatsoever.
?
Will sell all for $1400.00 plus shipping.
?
Thanks for looking,
RoD
------------------------------
Message: 8
Date: Mon, 11 May 2009 22:35:52 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: Dayton NODXA Hospitality Suite
To: John Papay <k8yse@xxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID:
<051120092235.934.4A08A847000E362F000003A622230650629B0A02D2089B9A019C04
040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Hey John,
Thank you for posting this. I regret very much that I can't make Dayton this
year, but I hope you get a great AMSAT turnout!
10th floor, you say? Does it face west? If so, bring your HT and Arrow along.
I'd like to at least work the hospitality suite!!!!
73, and thank you again!
Tim - N3TL
-------------- Original message from John Papay <k8yse@xxxxxx.xxx>: ----------
----
> Everyone is invited to stop by the Northern
> Ohio DX Association Hospitality Suite at the
> downtown Crowne Plaza Hotel, 10th Floor on
> Thursday, Friday or Saturday evening. Finger
> food and beverages are available and you'll
> see a lot of dx'ers and hopefully satellite
> types there. Enjoy the Dayton experience!
> We are all looking forward to the AMSAT
> Banquet and a chance to meet Richard Garriott!
>
> John K8YSE
> Doug KD8CAO
> Northern Ohio DX Association
>
> _______________________________________________
> 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: 9
Date: Mon, 11 May 2009 17:39:18 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: AMSAT UK Oscar News
To: "'amsat bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <F1279EC3333C4C3698D75B7A88FC5ACE@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Mine arrived in TN today as well. I have tucked it away to read at Dayton,
but the new, larger format is great.
Alan
WA4SCA
------------------------------
Message: 10
Date: Mon, 11 May 2009 18:57:26 -0400
From: "ANTHONY JAPHA" <tjjapha@xxxxxxxxx.xxx>
Subject: [amsat-bb] satpc32
To: amsat-bb@xxxxx.xxx
Message-ID: <380-220095111225726625@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
Where should I go to buy the cable (CT-62) for the FT-817 that connects the
CAT jack to the computer (RS-232 probably) for rig control? Anyone know of a
cable that has a built-in serial to USB converter? That would make portable
use easier.
Tnx and 73,
Tony, N2UN
------------------------------
Message: 11
Date: Mon, 11 May 2009 23:24:12 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: satpc32
To: tjjapha@xxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Cc: ANTHONY JAPHA <tjjapha@xxxxxxxxx.xxx>
Message-ID:
<051120092324.5783.4A08B39B000E22450000169722230650629B0A02D2089B9A019C0
4040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Anthony,
Do a search on eBay for "Yaesu CAT Cable," and you'll find a number of them
available from sellers in China. They're relatively inexpensive and actually
are USB cables that have the rig plug on the other end. They are
interchangeable between the FT-817, FT-757D and FT-897D. The one I bought from
an eBay seller has no brand name on it, but I picked up my radios used, and
one of them had a USB CAT cable with it made by Maxon. The model No. is RPC-
Y857.
Both cables proved to be totally "plug and play" with my Acer Aspire One
netbook. Both cables work perfectly with my 857 and with both of my 817s. The
cable from eBay was $22 with postage from China. It arrived in less than 2
weeks and was sent certified mail.
I hope this helps. Best of luck with your setup. Feel free to email me off the
BB if you have any questions.
73,
Tim - N3TL
-------------- Original message from "ANTHONY JAPHA" <tjjapha@xxxxxxxxx.xxx>:
--------------
Where should I go to buy the cable (CT-62) for the FT-817 that connects the
CAT jack to the computer (RS-232 probably) for rig control? Anyone know of a
cable that has a built-in serial to USB converter? That would make portable
use
> easier.
>
> Tnx and 73,
> Tony, N2UN
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Mon, 11 May 2009 19:41:07 -0400
From: "Tim Tapio" <tim@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: satpc32
To: <n3tl@xxxxxxxxx.xxx>, <tjjapha@xxxxxxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Cc: 'ANTHONY JAPHA' <tjjapha@xxxxxxxxx.xxx>
Message-ID: <000801c9d291$f521e560$df65b020$@xxx>
Content-Type: text/plain; charset="us-ascii"
http://www.hosenose.com/detail.asp?product_id=LCU-3Y3
Maybe a bit pricier but I've used a W1GEE converter for Icom rigs for a lot
of years....
73 de Tim, K4SHF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of n3tl@xxxxxxxxx.xxx
Sent: Monday, May 11, 2009 7:24 PM
To: tjjapha@xxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Cc: ANTHONY JAPHA
Subject: [amsat-bb] Re: satpc32
Anthony,
Do a search on eBay for "Yaesu CAT Cable," and you'll find a number of them
available from sellers in China. They're relatively inexpensive and actually
are USB cables that have the rig plug on the other end. They are
interchangeable between the FT-817, FT-757D and FT-897D. The one I bought
from an eBay seller has no brand name on it, but I picked up my radios used,
and one of them had a USB CAT cable with it made by Maxon. The model No. is
RPC-Y857.
Both cables proved to be totally "plug and play" with my Acer Aspire One
netbook. Both cables work perfectly with my 857 and with both of my 817s.
The cable from eBay was $22 with postage from China. It arrived in less than
2 weeks and was sent certified mail.
I hope this helps. Best of luck with your setup. Feel free to email me off
the BB if you have any questions.
73,
Tim - N3TL
-------------- Original message from "ANTHONY JAPHA"
<tjjapha@xxxxxxxxx.xxx>: --------------
Where should I go to buy the cable (CT-62) for the FT-817 that connects the
CAT jack to the computer (RS-232 probably) for rig control? Anyone know of a
cable that has a built-in serial to USB converter? That would make portable
use
> easier.
>
> Tnx and 73,
> Tony, N2UN
> _______________________________________________
> 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: 13
Date: Mon, 11 May 2009 19:49:24 -0400
From: N1HOQ <N1HOQ@xxxxxxx.xxx>
Subject: [amsat-bb] G-5500 Rotor trouble resolved.
To: amsat-bb@xxxxx.xxx
Message-ID: <4A08B984.7050106@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello group.
The problem with the rotor has been fixed. Turns out the gears
inside had frozen on their shafts. A little penetrant and easy
persuasion got things running smoothly again. No parts, just time. This
rotor sees intermittent use as its attached to my portable rig, and must
sit outdoors.There was a little bit of water in the bottom of the case,
as the drain hole was gummed up a bit. I filed it out a bit and
regreased everything and she works like a charm again. Thanks to all for
the replies and the help.
73 de Shawn - N1HOQ # 33948
------------------------------
Message: 14
Date: Mon, 11 May 2009 19:43:06 -0500
From: "Jim Shorney" <jshorney@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: A word of caution - Hygain DB-218SAT Sat
Antenna's
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <20090512003934.EC4CF5680F8C8@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
On Mon, 11 May 2009 07:31:48 +0200, Allan Saul wrote:
>First of all, as supplied by Hy-Gain, these switches
>could never work by design.
This is not your grandfather's HyGain. MFJ bought the tooling and
designs, but not the brains, from Telex. The old crew would not make
mistakes like that. I don't think I know anyone from the "old" HyGain
who would buy a modern HyGain antenna.
But that's just my opinion.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and he
will learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://radiojim.exofire.net
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
------------------------------
Message: 15
Date: Mon, 11 May 2009 22:09:37 -0400 (EDT)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: satpc32
To: tjjapha@xxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Message-ID:
<2675517.1242094178224.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Mine is from an Ebay auction, I think the seller has "KAWA" in their name. It
works great.
73, Drew KO4MA
-----Original Message-----
>From: ANTHONY JAPHA <tjjapha@xxxxxxxxx.xxx>
>Sent: May 11, 2009 6:57 PM
>To: amsat-bb@xxxxx.xxx
>Subject: [amsat-bb] satpc32
>
>Where should I go to buy the cable (CT-62) for the FT-817 that connects the
CAT jack to the computer (RS-232 probably) for rig control? Anyone know of a
cable that has a built-in serial to USB converter? That would make portable
use easier.
>
>Tnx and 73,
>Tony, N2UN
>_______________________________________________
>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: 16
Date: Mon, 11 May 2009 21:57:57 -0500
From: "Howard Kowall" <hkowall@xxxx.xx>
Subject: [amsat-bb] Re: satpc32
To: <amsat-bb@xxxxx.xxx>
Message-ID: <004a01c9d2ad$73f10400$6701a8c0@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I made my own level converter using a max 232c ic and some caps
if you need a circuit send me an email
It's not very hard to do and this circuit is used in other circuits which my
be of interest to you and others
Howard
VE4ISP
----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: <tjjapha@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Monday, May 11, 2009 9:09 PM
Subject: [amsat-bb] Re: satpc32
> Mine is from an Ebay auction, I think the seller has "KAWA" in their name.
> It works great.
>
> 73, Drew KO4MA
>
> -----Original Message-----
>>From: ANTHONY JAPHA <tjjapha@xxxxxxxxx.xxx>
>>Sent: May 11, 2009 6:57 PM
>>To: amsat-bb@xxxxx.xxx
>>Subject: [amsat-bb] satpc32
>>
>>Where should I go to buy the cable (CT-62) for the FT-817 that connects
>>the CAT jack to the computer (RS-232 probably) for rig control? Anyone
>>know of a cable that has a built-in serial to USB converter? That would
>>make portable use easier.
>>
>>Tnx and 73,
>>Tony, N2UN
>>_______________________________________________
>>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: 17
Date: Mon, 11 May 2009 22:13:11 -0500
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Subject: [amsat-bb] Re: A word of caution - Hygain DB-218SAT Sat
Antenna's
To: "'Allan Saul'" <allan@xxxxxxxx.xx.xx>, "'Norman W Osborne'"
<ve3cje@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <COL0-DAV544FFAD498F4BF0208BA728A600@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Allan, and Norman,
I have the Hy-Gain antennas, but have not had your issues. I did fill
the 2 meter antenna with water once and had trouble that way, but other wise
they load up and seem to work fine, and the switches help greatly with the
fades. My antennas came from MFJ/Hy-Gain via Burghardts. Maybe they were
original Hy-Gain stock carried over?
73,
Joe kk0sd
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Allan Saul
Sent: Monday, May 11, 2009 12:32 AM
To: Norman W Osborne
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] A word of caution - Hygain DB-218SAT Sat Antenna's
Hi Norman,
You mention the use of the Hy-Gain Sat Antennas
in you setup. I was foolish enough to purchase this
Oscar Link combination of the VB-216SAT 2m 16 element
cross Yagi and the UB-7030SAT 70cm Cross Yagi.
The antennas themselves are basically OK, but there
are serious technical issues with the "Polarization Switch"
they supply for changing from LHCP to RHCP.
First of all, as supplied by Hy-Gain, these switches
could never work by design.
Some technical explanation - As the T-Match they use on the
Horizontal and Vertical driven element presents an impedance
of 200 ohms this needs to be transformed at the feed point
down to 50 ohms using a 4:1 balanced to unbalanced balun using
a 1/4 wavelength piece of co-axial. These seem cut to the
right length using the thin RG-316.
As per the Satellite Experimenters Handbook and RSGB VHF/UHF handbook, the
idea is then to transform this 50 ohms
at the feedpoint up to 100 ohms at the switch using a 1/4 wavelength
run of 75 ohms co-ax (normally RG-6/U). The two 100 ohms from the
V and H will them be in parallel and be 50 ohms again.
So what's wrong with the Hy-Gain switches you ask ?
1: They use RF-303/u 50 Ohm cable from the feedpoint baluns to the
Polarization switch, not 75 Ohm cable. This means that at best
you will get a 2:1 VSWR through the switch, even if the antenna
is perfectly matched. This was confirmed by putting the switch
on a Agilent Network Analyzer which I have at work.
2: The cables they use are of equal length. The problem with this
is that when you open the switch up, the designers neglected to
take into account the extra phase delay through the cheap Tyco
Dc relay they use. This meant the phase match between the H and V
was off by at least 40-90 degrees from the ideal 180. This means
those guys using the switch as it exists will have anything but
circular polarization.
To fix the problem I had to practically rebuild the Switching Network by
replacing the RG303 with RG-6. The 1/2 wavelength coax
inside the switch used to add 180 degrees phase also has to be replaced with
RG-6. The 1/4 wave legs then needed to be adjusted by measuring the phase
delay on the Agilent Network Analyzer until you get a perfect 180 degree
switch between RHCP and LHCP.
This a way beyond the capabilities of the average Radio Amateur. Emails sent
to Hy-Gain (MFJ) about this issue went un-answered off course.
Other issues :
1: I found that the 70cm antenna had a VWSR dip at around
440 MHz and nothing I did with the match could get it any lower
2: On one of the feed point baluns the "Red" marking on the
solder lugs was different from the other 3. This means if assembled
as instructed, you would never get circular polarization. There
is no way I could have know this. It was only discovered when I picked out
the Silicone RTV from the balun and saw the
manufacturing mistake on their part.
3: I seriously question the Hy-Gain claim on the data Sheet
"True RF, 50 Ohm switching relays are rated for 200W PEP and contribute to
improved VSWR". They use cheap Tyco DC switching
relays in the design and they are definitely not RF Relays.
My intention is to replace the antennas with the M2 versions
in the summer. From the data sheets and correspondence I have
has with them it looks like they have done the job properly.
73's
Allan Saul
ZS1LS
South Africa.
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End of AMSAT-BB Digest, Vol 4, Issue 220
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