[FARC] Saturday May 17, 2008 8:30 - 8:45 PM EDT - GO-32 Party

[kirktal7237 at msn.com]

Joe,  just had a comment about using the same antenna for both the uplink 
and downlink.   It has been suggested to me from various corners that this 
can be a dangerous situation for a radio at high power due to the fact that 
you can be receiving a signal and have RF on the same transmission line at 
the same time.   I've been told that this same situation can occur when 
using a single antenna for simple crossband repeat operations as well, like 
on the Yaesu 8900R.   Some have said there is nothing to this, others have 
said it can be a problem at high power,  I just don't know.    Have you or 
anybody else ever heard of this?

73
KB3ONM
Kirk

--------------------------------------------------
From: "Joseph M. Durnal" <joseph.durnal at gmail.com>
Sent: Tuesday, May 06, 2008 6:14 PM
To: "Frederick, Maryland ARC" <farc at mailman.qth.net>
Cc: "MADXRA" <madxra at madxra.org>
Subject: [FARC] Saturday May 17, 2008 8:30 - 8:45 PM EDT - GO-32 Party

> What is a GO-32 party?
> Something I just made up today.  GO-32 is a 9.6kbps crossband APRS
> digipeater (among other things) that I was able to work with my
> Kenwood TM-D710 and a standard mobile antenna.  The trouble with GO-32
> is that it isn't one of the more popular APRS satellites so things
> don't get gated to findu.com, and the thrill of seeing your own
> position beaconed will wear off quick.  So having a schedule with
> several hams is a great way to work the bird, and share the experience
> with others at the same time, as well as see something other than your
> own position report!
>
> What do you need?
> Rig/TNC
> I'll be using the Kenwood TM-D710.  The TM-D700 and TH-D7A & TH-D7AG
> will also work.  The Kenwood TS-2000 should work as well - but will
> need software like XASTIR or UI-View for APRS functions.  Other packet
> setups with 9600 bps capabilities will work too, again, for APRS
> functionality you'd need to use an APRS software client.  Even without
> APRS software, it will be possible to monitor packets with a regular
> terminal with the TNC set to monitor.
>
> Antenna
> A 19" whip with a ground plane should work great.  A small yagi will
> improve the receive on 70cm, as long as you can aim it.
>
> Why May 17, 2008 between 8:30 & 8:45 PM EDT?
> Well, the satellite makes nearly a perfect pass over Frederick, and it
> is a pretty good pass for folks in Dayton as well.  Passes that go
> right overhead are the easiest to work with a 50 watt mobile when tx
> is 2m and rx is 70cm because the 19" antenna has some pretty good gain
> in the upward direction on 70cm.  Of course, when it is straight up,
> it is not so good, but it is only straight up for less than a minute.
>
> Pass Details:
> 8:33, heading 162 deg, elevation 10 deg, set receiver about 435.235
> 8:35, heading 162 deg, elevation 30 deg, set receiver about 435.230
> 8:38, heading 77 deg, elevation 85 deg, set receiver about 435.225
> 8:41, heading 350 deg, elevation 30 deg, set receiver about 435.220
> 8:43, heading 350 deg, elevation 10 deg, set receiver about 435.215
>
> Uplink Frequency:
> 145.85 MHz All APRS messaging (or fixed station non-Mic-E positions).
> . Only TOCALLs that begin with "APxxxx".
>
> 145.93 MHz All APRS Mic-E positions and status(D7, D700 and D710s with
> comment set to "Committed, Special or PRIORITY"...
>
> The reason for these uplink distinctions is due to GO-32 hardware that
> will only digipeat a packet on 145.85 that has a TOCALL beginning with
> "A". (All APRS fixed station packets and all APRS messages including
> D7 and D700's) . The 145.93 channel will only accept packets that
> begin with a digit between 1,2,3,4,5,6,7. . But fortunately the D7 and
> D700's do this naturally as long as the position comment is set to
> "committed, SPecial or PRIORITY"...
>
> More details about working the GO-32 satellite:
> Bob Bruninga's web site, you'll want to read this if you plan on
> operating this satellite.
> http://web.usna.navy.mil/~bruninga/GO32-ops.html
>
> If you are interested and need some help getting setup, please let me
> know, especially if you have a Kenwood TM-D710, since that is what I
> used, I pretty much know how to set it up, but I'll be happy to work
> with anyone interested.  If anyone has an IGATE that they can set to
> receive on 435.225 at 9600 bps, that would be great, especially if you
> can be around to adjust for doppler!
>
> 73 de Joseph Durnal NE3R
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