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

Wed May 7 13:13:26 EDT 2008

Hi Kirk,
I've never heard of a problem with this.  The multiband radios are
designed to work this way.  I do notice that my 70cm receiver is
desensed a little when transmitting at high power.

73 de Joseph Durnal NE3R

On Wed, May 7, 2008 at 2:04 AM,  <kirktal7237 at msn.com> wrote:
> 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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> >
> >
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