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CX2SA > SATDIG 26.05.09 20:47l 578 Lines 19921 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Gulf Alpha antenna (Bruce Robertson)
2. Re: Antenna Polarization (k9qho6762@xxxxxxxxx.xxxx
3. Re: Calculation of foundation requirements for dish antenna
(Sven Arne Astrup)
4. Re: Gulf Alpha antenna (George Henry)
5. G-5500 question (Larry Gerhardstein)
6. DJ-G7T and full-duplex satellite operating
(Patrick STODDARD (WD9EWK/VA7EWK))
7. Re: DJ-G7T and full-duplex satellite operating
(Andrew Glasbrenner)
8. Re: DJ-G7T and full-duplex satellite operating (Alan P. Biddle)
9. Iss digi rs0iss-4 today! (Mr Jeffrey L Ross)
10. ISS SSTV Active (David Barber)
11. CP6 received at last... (Shamai "SAM" Opfer)
12. Re: DJ-G7T and full-duplex satellite operating
(Patrick STODDARD (WD9EWK/VA7EWK))
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 May 2009 18:20:26 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: Gulf Alpha antenna
To: vk5alx@xxxxx.xxx
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID:
<49657a760905251420y53640edbq977c5a749607ae4d@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Mon, May 25, 2009 at 9:18 AM, <vk5alx@xxxxx.xxx> wrote:
> I ? use ?a ?homebrew 2x5 on a 2 metre long boom and it works very well
> with all current sats.
> 73s, Alex VK5ALX
>
>>One of the other questions I have, "2m Satellite 2x5 does it have enough
>>gain to work the birds?
>>
>> 73,
>> Norman.
>
>>73's Jan - PE0SAT
I've been experimenting with extremely cheap antennas and mast-mounted
preamps. In a relatively radio-quiet environment, I can use a wire
dipole on 2m -- directly attached to the preamp -- and hear VO-52 from
about 5 degrees above the horizon. AO-7 is quite copyable, too.
The 2x5 of course has much better directionality, which will improve
gain, and the circular polarization, which should reduce fading.
My point is two-fold. First, Alex, make the preamp your first
purchase, not the beam. (Perhaps that's already your plan.) Second,
you might enjoy playing around with a very simple antenna with the
preamp first, before adding the complexity of steering a rotor through
a pass. I'm certainly not advocating that people do without beams: I
have a set of home-brews that are about 6 elements, and I've done most
of my work with them. I just think there is a cheaper, easier, first
step.
73,
Bruce VE9QRP
------------------------------
Message: 2
Date: Mon, 25 May 2009 16:29:02 -0700 (PDT)
From: k9qho6762@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: Antenna Polarization
To: amsat-bb@xxxxx.xxxx wd9apy@xxxxx.xxx
Message-ID: <407829.60599.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
This is what I would recommend.
?
I do not have polarization switching?for either of my antennas.
?
My?11 turn helix on 435 MHz is RHCP
?
My 14 element KLM on 144 MHz is LHCP
?
K9CIS has studied the polarizations of the uplink/downlink signals from AO-7,
VO-52, and FO-29 and this seems to be the best selection.
?
Using his recommendation, I do remember switching my KLM from RH to LH because
AO7's downlink was weak and switching did solve the problem.
?
The helix (polarization cannot be switched) was constructed for AO-40 (which
was RH) and easily hears FO-29.
?
The optimum set-up is to?be able to switch polarization, but you know how
things go in the world of ham radio.
?
All the best.
?
Mike (K9QHO)
AMSAT 33589
?
?
------------------------------
Message: 3
Date: Tue, 26 May 2009 03:33:43 +0200
From: "Sven Arne Astrup" <sastrup@xxxxxx.xx>
Subject: [amsat-bb] Re: Calculation of foundation requirements for
dish antenna
To: "'Pieter Kotze'" <PKotze@xxxx.xx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <02A973F101224CEABE48BA9791283C98@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Guess this is what you are looking for:
http://www.qsl.net/n1bwt/contents.htm
73 de Sven LA6KJ
-----Opprinnelig melding-----
Fra: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx P? vegne
av Pieter Kotze
Sendt: 25. mai 2009 15:48
Til: amsat-bb@xxxxx.xxx
Emne: [amsat-bb] Calculation of foundation requirements for dish antenna
Hello all
Anyone out there got a rough guide to calculate the foundation requirements
for a parabolic dish antenna?
We have acquired a 10m C-band dish which we would like to re-use. I am a
bit rusty on undergraduate applied mathematics.
Anyone with a nice tutorial?
Regards
Pieter
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------------------------------
Message: 4
Date: Mon, 25 May 2009 22:23:49 -0500
From: "George Henry" <ka3hsw@xxx.xxx>
Subject: [amsat-bb] Re: Gulf Alpha antenna
To: "Norman W Osborne" <ve3cje@xxxxx.xxx>, "amsat-bb"
<AMSAT-BB@xxxxx.xxx>
Message-ID: <DCF40F9CE3DA42669B9C97BD838F7056@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have their 5x5 2-meter CP and 7x7 435 CP antennas, and can honestly say
that I have NEVER seen another antenna built as well as they are. They have
performed very well for me, and look like they can stand up to anything you
or Mother Nature can throw at them. When we finally get a HEO satellite,
I'll be looking for something with more gain, and will almost certainly go
with them again.
George, KA3HSW
----- Original Message -----
From: "Norman W Osborne" <ve3cje@xxxxx.xxx>
To: "amsat-bb" <AMSAT-BB@xxxxx.xxx>
Sent: Monday, May 25, 2009 6:17 AM
Subject: [amsat-bb] Gulf Alpha antenna
> Is there anyone using Gulf Alpha antenna's?
>
> I am looking for feedback as I am considering buying the 70cm X yagi.
>
> 73,
> Norman.
------------------------------
Message: 5
Date: Mon, 25 May 2009 21:51:18 -0600
From: Larry Gerhardstein <larryg@xxxxxxx.xxx>
Subject: [amsat-bb] G-5500 question
To: "amsat-bb" <AMSAT-BB@xxxxx.xxx>
Message-ID: <000801c9ddb5$3b16f870$0200a8c0@xxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Will the G-5500 AZ rotator fit inside the top extension of a UStower
TMM433HD tower? Anyone use this combination?
Larry W7IN
------------------------------
Message: 6
Date: Mon, 25 May 2009 22:21:04 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] DJ-G7T and full-duplex satellite operating
To: amsat-bb@xxxxx.xxx
Message-ID: <103298.16393.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
I spent this afternoon using my new DJ-G7T HT on a few passes, with
mixed results. Working with the incomplete manual that came with
the HT has been a challenge. I still need to use it more, and be
ready to make more changes to settings. So far, I'll say it is a
good radio for satellite work. Not great, but good.
I first tried this HT on the satellites during the weekend of the
Dayton HamVention. The first report I received on it related to my
transmit audio - sounding quiet and compressed. There is a mic gain
setting in the firmware, which I put to the maximum setting. Over
this weekend, I received the EDS-10 speaker/mic adapter cable to go
into the speaker/mic jack on the top of the HT - a 4-conductor 1/8"
(3.5mm) plug with threads around the base of the plug. Without this
cable, I did not want to risk trying full-duplex operation on the
birds. With this, I could feed audio through a splitter to my
earpiece and audio recorder.
I tried AO-27 and SO-50 passes this (Monday) afternoon around 2120-
2140 UTC. The 5W transmitter and change to the mic gain setting
meant I could be heard, but I had difficulties hearing the satellite.
Also, I could not hear myself while transmitting. I tried another
AO-27 pass at 2301 UTC, and part of the pass was covered up by a
loud bout of intermod (Phoenix Fire Department VHF dispatch channel
swamped the receiver). Not good.
Before the first AO-51 pass I had this afternoon at 0027 UTC, I
talked with John K8YSE about the radio and the problems I had. He
suggested I turn off the extended-receive capability of the HT,
limiting it to just the ham bands. I did that, and then tried the
AO-51 pass. Things went much better. I had an easier time hearing
the satellite, and could hear myself through the satellite while
transmitting - something I've never been able to do with my IC-W32A.
I still need to go back to AO-27 and SO-50, to see if limiting the
receiver to just the ham bands yields any improvement when working
those satellites. I can't wait to see a new and improved version of
the instruction manual, and improvements to the firmware to fix some
of the idiosyncracies I've seen in trying to get this radio set up.
Even with those issues, I'm glad I bought the radio. I plan to
continue working with this radio, to see if I can improve on what I
heard this afternoon on AO-51. This may turn out to be a nice radio
for the satellites. For now, it's a work-in-progress. Maybe others
who picked this radio up at Dayton - or have ordered it since then -
will chime in with their comments about the radio.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 7
Date: Tue, 26 May 2009 09:14:14 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: DJ-G7T and full-duplex satellite operating
To: <amsat-bb@xxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <99E83A83EB9C48A5BE86C20C24D106D6@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
My EDS-10 arrives this week, probably tomorrow. Saturday I did hook the
radio up to my ancient Arrow antenna and took a listen to AO-27. Receiving
on the subband as I would if working the satellite, one thing odd I noticed
was the off frequency response of the radio. If I was 5 kHz off, it seemed
that very little could be heard. Most of my other radios give more of a
partially readable signal when off frequency. Sensitivity was excellent. I
also listened on the triband Diamond rubber duck I purchased to replace the
stock duck, and reception was still decent.
I'll agree the manual is horrid, but there is a note included that says it
is a preliminary version and an updated one will be posted to the website
soon.
More to follow after the headphone adapter arrives.
73, Drew KO4MA
----- Original Message -----
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, May 26, 2009 1:21 AM
Subject: [amsat-bb] DJ-G7T and full-duplex satellite operating
>
> Hi!
>
> I spent this afternoon using my new DJ-G7T HT on a few passes, with
> mixed results. Working with the incomplete manual that came with
> the HT has been a challenge. I still need to use it more, and be
> ready to make more changes to settings. So far, I'll say it is a
> good radio for satellite work. Not great, but good.
>
> I first tried this HT on the satellites during the weekend of the
> Dayton HamVention. The first report I received on it related to my
> transmit audio - sounding quiet and compressed. There is a mic gain
> setting in the firmware, which I put to the maximum setting. Over
> this weekend, I received the EDS-10 speaker/mic adapter cable to go
> into the speaker/mic jack on the top of the HT - a 4-conductor 1/8"
> (3.5mm) plug with threads around the base of the plug. Without this
> cable, I did not want to risk trying full-duplex operation on the
> birds. With this, I could feed audio through a splitter to my
> earpiece and audio recorder.
>
> I tried AO-27 and SO-50 passes this (Monday) afternoon around 2120-
> 2140 UTC. The 5W transmitter and change to the mic gain setting
> meant I could be heard, but I had difficulties hearing the satellite.
> Also, I could not hear myself while transmitting. I tried another
> AO-27 pass at 2301 UTC, and part of the pass was covered up by a
> loud bout of intermod (Phoenix Fire Department VHF dispatch channel
> swamped the receiver). Not good.
>
> Before the first AO-51 pass I had this afternoon at 0027 UTC, I
> talked with John K8YSE about the radio and the problems I had. He
> suggested I turn off the extended-receive capability of the HT,
> limiting it to just the ham bands. I did that, and then tried the
> AO-51 pass. Things went much better. I had an easier time hearing
> the satellite, and could hear myself through the satellite while
> transmitting - something I've never been able to do with my IC-W32A.
>
> I still need to go back to AO-27 and SO-50, to see if limiting the
> receiver to just the ham bands yields any improvement when working
> those satellites. I can't wait to see a new and improved version of
> the instruction manual, and improvements to the firmware to fix some
> of the idiosyncracies I've seen in trying to get this radio set up.
> Even with those issues, I'm glad I bought the radio. I plan to
> continue working with this radio, to see if I can improve on what I
> heard this afternoon on AO-51. This may turn out to be a nice radio
> for the satellites. For now, it's a work-in-progress. Maybe others
> who picked this radio up at Dayton - or have ordered it since then -
> will chime in with their comments about the radio.
>
> 73!
>
>
>
>
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
>
>
> _______________________________________________
> 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: 8
Date: Tue, 26 May 2009 09:33:47 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: DJ-G7T and full-duplex satellite operating
To: "'Andrew Glasbrenner'" <glasbrenner@xxxxxxxxxx.xxx>,
<amsat-bb@xxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <081E1291CDA54A64BB9C05F0DD211039@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi,
The Elk with handle seems to be working fine, and the EDS-10 should be in by
the end of the week, as should the digital voice recorder. By the time the
rig arrives in 2-3 weeks, you guys will have no doubt figured it all out.
Did somebody mutter "cart before the horse?"
As always, thanks for these helpful posts.
Alan
WA4SCA
------------------------------
Message: 9
Date: Tue, 26 May 2009 11:20:19 -0400
From: "Mr Jeffrey L Ross" <radiooperator@xxxxxxx.xxx>
Subject: [amsat-bb] Iss digi rs0iss-4 today!
To: "amsat" <amsat-bb@xxxxx.xxx>
Message-ID: <49DF35FC45BB47BBBB875337F88F5D3F@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
hi folks, wondering why there changing the digi around from -3 to -4 again.
just when i got a nice pass, hi
oh well , try to reach it today 1600 pass.
kc8gkf-5
------------------------------
Message: 10
Date: Tue, 26 May 2009 16:43:41 +0100
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] ISS SSTV Active
To: "'amsat'" <amsat-bb@xxxxx.xxx>
Message-ID: <33ACD2671B7D4DFFAF682E1C749636BC@xxxxxxxx>
Content-Type: text/plain; charset="US-ASCII"
ISS SSTV is active on 145.800MHz
UK pass at 15.40UTC
Pictures from camera looking out of the window.
David
G8OQW
------------------------------
Message: 11
Date: Tue, 26 May 2009 19:55:27 +0300
From: "Shamai \"SAM\" Opfer" <4z1ws.sam@xxxxx.xxx>
Subject: [amsat-bb] CP6 received at last...
To: amsat-bb@xxxxx.xxx
Message-ID:
<e0a093a90905260955s4d12de23k1d59495afc98a892@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi all,
Finally succeeded to copy and record CP6 CW beacon.
The digital mode sounds difficult to inercept, as it is very short,
imediately following the CW transmission, and appears only every 30
seconds,which i think makes it impossible to manually tune on the SSB
signal.
In addition, when using SatPC auto Doppler compensation (programming the
IC910H via CAT), the received frequency "jumps"every 1 second. As far as I
remember, this rate can not be changed. I guess that updating the
transceiver every 100mS would make the audio pitch much more constant and
smooth.
I will try later on to activate CalPoly's parsing software. (Tips are
welcome... :-)
thanks!
73
Shamai,
4Z1WS
------------------------------
Message: 12
Date: Tue, 26 May 2009 10:12:29 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: DJ-G7T and full-duplex satellite operating
To: amsat-bb@xxxxx.xxx
Message-ID:
<2e18ad3e0905261012x7ae16baaoc26e8f6de24de915@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Drew!
> My EDS-10 arrives this week, probably tomorrow. Saturday I did hook the
> radio up to my ancient Arrow antenna and took a listen to AO-27. Receiving
> on the subband as I would if working the satellite, one thing odd I noticed
> was the off frequency response of the radio. If I was 5 kHz off, it seemed
> that very little could be heard. Most of my other radios give more of a
> partially readable signal when off frequency. Sensitivity was excellent. I
> also listened on the triband Diamond rubber duck I purchased to replace the
> stock duck, and reception was still decent.
Mine seems to be a little bit off-frequency, maybe a little on the high side.
I noticed that near the end of the AO-51 pass last night, when I stayed on
435.295 later in the pass than I normally would when using other radios.
I'll make note of that the next time I try this on the birds, to see
if I need to
start out at 435.315 for AO-51 or 436.805/.810 for SO-50 or AO-27.
When using the HT on local repeaters, I don't find the radio to be off-
frequency. I can tune to the proper frequency for the repeaters on 2m
or 70cm (I can't hit the only analog 23cm repeater in the Phoenix area
from where I live), and have had good reports from other tests I did
last night.
> I'll agree the manual is horrid, but there is a note included that says it
> is a preliminary version and an updated one will be posted to the website
> soon.
Yes, that note was in there. The manual is a bit of an impediment, when
trying to figure out a new radio.
Maybe we can get additional comments from others who have this radio.
I'm going to forward my comments to Alinco's US distributor, after talking
with those guys at length at Dayton. They are curious to hear how well this
radio works for satellite use. Again, this appears to be a work-in-progress,
especially with the fact the radio's firmware can be updated.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
_______________________________________________
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!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 4, Issue 242
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