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CX2SA > SATDIG 29.07.10 21:20l 251 Lines 7308 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V5 324
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Sent: 100729/1905Z @:CX2SA.LAV.URY.SA #:9859 [Minas] FBB7.00e $:AMSATBB5324
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: [ao51-modes] AMSAT Press Coverage (Andrew Glasbrenner)
2. Homebrew Polarity Switch (David Wing)
3. Re: Homebrew Polarity Switch (Robert Bruninga)
4. Re: Homebrew Polarity Switch (HB9OMQ)
5. Re: El Segundo CA Joint Meeting (Clint Bradford)
6. EL SEGUNDO DATE IS AUGUST 17, 2010 (Clint Bradford)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 Jul 2010 20:14:54 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: [ao51-modes] AMSAT Press Coverage
To: Clint Bradford <clintbradford@xxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>, AO51 Modes <ao51-modes@xxxxx.xxx>
Message-ID: <4C50C7FE.6000308@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Clint Bradford wrote:
> Gordon West and I are working with local newspapers, CQ magazine, and
possible television coverage for a demo of working AO-51 at the Orange
County Fair (Southern California).
>
> Thurs July 29 5:03PM PDT - GMT 0003 07/30/10
> Thurs Aug 5 5:24PM PDT - GMT 0024 08/06/10
> Sun Aug 8 5:04PM PDT - GMT 0004 08/09/10
>
> Are any of these dates scheduled for NON-V/U mode? We need as much lead
time as possible for the media.
>
> THANK YOU!
>
> Clint Bradford
> 909-241-7666
>
Unless something unexpected happens, we should be able to have V/U on
for you these dates.
73, Drew KO4MA
------------------------------
Message: 2
Date: Wed, 28 Jul 2010 22:41:58 -0700
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] Homebrew Polarity Switch
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <002a01cb2ee0$c2e6d1d0$48b47570$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
I?m looking into making a polarity switch for a ? wave offset crossed yagi
and am reviewing the write-up in the ARRL Satellite Handbook and the ARRL
Antenna Book (pretty much identical articles). The diagram calls for a ?1/4
wave 36 ohm transformer? as a part of the circuitry. I?m having some
trouble finding anything like this online. Is this a readily available
item? Is it something I should plan on scratch building? There is a
picture in the Antenna Handbook and the antenna includes this item and it
appears to be a manufactured part.
If anyone can point me in the right direction to find this item I would
appreciate it. Additionally, if it is something that I could fabricate and
there is good info available online, please forward any appropriate links to
me.
Thanks,
David
K6CDW
------------------------------
Message: 3
Date: Thu, 29 Jul 2010 08:46:52 -0400
From: "Robert Bruninga" <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Homebrew Polarity Switch
To: "'David Wing'" <david@xxxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Message-ID: <9528D6D96406425988C3DC33C7D7B4F7@xxxxx.xxxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
> The diagram calls for a "1/4
> wave 36 ohm transformer" as a part of the circuitry. I'm
having some
> trouble finding anything like this online.
Its two 1/4 wave pieces of RG-59 (75 ohm coax) in parallel...
Bob, wb4apr
------------------------------
Message: 4
Date: Thu, 29 Jul 2010 18:28:11 +0200
From: "HB9OMQ" <hb9omq@xxxxxxx.xx>
Subject: [amsat-bb] Re: Homebrew Polarity Switch
To: "David Wing" <david@xxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <HJEELKBGKCMHEBHOFMGCMEBJDEAA.hb9omq@xxxxxxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Dear David
In opposition of most common knowledge and post's of Ham's
you will not find much benefit in going circular.
If any antenna of a satellite is not pointing directly at
your antenna the polarization will be ellipsoid and not
circular.
I had a system to switch my antenna from vertical to horizontal
and circular left and right. Most of the time vertical or horizontal
polarization was best. When the satellite raises over the horizon
or sets to the horizon, horizontal will be best. Above some angle
vertical is better. During the pass the polarity may Change again.
Circular was at most as good as vertical or horizontal
but never better.
The switching circuitry to switch from horizontal to vertical is
only a single pole dual throw switch without any impedance transformation.
Much more easy to realize and much cheaper too.
The promised 3 dB Gain from a circular Antenna I never got.
Just a suggestion.
Paul
HB9OMQ
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxxxx
Auftrag von David Wing
Gesendet: Donnerstag, 29. Juli 2010 07:42
An: 'AMSAT BB'
Betreff: [amsat-bb] Homebrew Polarity Switch
I?m looking into making a polarity switch for a ? wave offset crossed yagi
and am reviewing the write-up in the ARRL Satellite Handbook and the ARRL
Antenna Book (pretty much identical articles). The diagram calls for a ?1/4
wave 36 ohm transformer? as a part of the circuitry. I?m having some
trouble finding anything like this online. Is this a readily available
item? Is it something I should plan on scratch building? There is a
picture in the Antenna Handbook and the antenna includes this item and it
appears to be a manufactured part.
If anyone can point me in the right direction to find this item I would
appreciate it. Additionally, if it is something that I could fabricate and
there is good info available online, please forward any appropriate links to
me.
Thanks,
David
K6CDW
_______________________________________________
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------------------------------
Message: 5
Date: Thu, 29 Jul 2010 10:37:44 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] Re: El Segundo CA Joint Meeting
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <90D8F6E2-3D22-463D-AD28-4952307F4142@xxx.xxx>
Content-Type: text/plain; charset=us-ascii
Meeting date is AUGUST 15 in El Segundo.
We'll work AO-51 at 5:45PM-ish, then go inside for the presentation right
afterward. We'll be through by 8PM.
Clint, K6LCS
909-241-7666
P.S. - Do not proofread your own material after spending a sleepless night
with as sick cat ... (grin)
------------------------------
Message: 6
Date: Thu, 29 Jul 2010 10:40:38 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] EL SEGUNDO DATE IS AUGUST 17, 2010
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <16694622-F45F-474D-B3CD-EC04C4138279@xxx.xxx>
Content-Type: text/plain; charset=us-ascii
Third time's the charm ...
Meeting date is AUGUST 17, 2010 in El Segundo.
We'll work AO-51 at 5:45PM-ish, then go inside for the presentation right
afterward. We'll be through by 8PM.
Clint, K6LCS
909-241-7666
P.S. - Do not proofread your own material after spending a sleepless night
with as sick cat ... (grin)
------------------------------
_______________________________________________
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 5, Issue 324
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