[ao16aprs] Re: PACSAT

[Mike Gilchrist <kf4fdj@amsat.org>]

Jim,

At 07:50 AM 02/04/2000 -0600, Jim Gill wrote:
>----- Original Message -----
>From: "Mike Gilchrist" <kf4fdj@amsat.org>
> > In practice, it is a good idea to correct both for uplink and downlink on
> > the pacsats.  You could program non-standard splits in your rig, and just
>                                        ^^^^^^^^^^^^^^^^^^^^^
>
> > tune frequency pairs as the pass progresses.
>         ^^^^^^^^^^^^
>
>Mike, I'm not sure if you're suggesting that possibly a radio like the
>Kenwood TMD700a could store both the up and downlink (different bands) into
>one memory using non-standard splits, and switch between these
>pre-programmed up/down sets, or that you would simply have some VHF
>and UHF memories ("pairs") seperately programmed, and you would have to tune
>each side as the pass progresses.

Most contemporary dual band radios have the ability to program non-standard 
splits, including transmit/receive in different bands.  Even the Alinco 
DJ-G1T 2 m HT, which is only a 2 m rig, will receive on 70 cm, and allow 
you to program non-standard splits, including transmit/receive on different 
bands.  Stock, it will not tune below 440 kHz, but there is a mod on 
http://www.mods.dk which involves pressing 3 keys to "open" the receive to 
include the Oscar subband.

I program non-standard pairs in my Yaesu FT50 for working AO-27 and 
SO-35.  However, since neither of my HTs are full duplex, this technique 
only works in half duplex rigs.

There might be an error in my logic with the Kenwood rig, since I assume 
it's using separate VFOs.  My post was mostly a result of brainstorming, 
where I am considering using an old Yaesu FT5100 for the pacsats.

There is a mod for 9k6 packet on the aforementioned site, and the rig has a 
function called, "Alternating Band Memory Selection," where mic clicks can 
select programmed memories from either band/VFO.

I think, and again I'm just brainstorming here, InstanTrack, in conjunction 
with Tony's (AA2TX) InstanTune, which will operate a rig through the mic 
click interface, would work for the pacsats.

Both programs are available for download from the AMSAT site, under PC 
software: http://www.amsat.org/amsat/ftpsoft.html#pc.

I don't own a TMD700, and haven't had occasion to play with one either, so 
I can't comment.  If you'd like to send me your's, say for a few months, 
I'd play with it and get back to you!  :-)

I'm sure I'll be corrected if it's been done, but I don't think anyone has 
been successful using that particular rig to effect a two-way communication 
with UO-22, although Jeff, KB2WQM HAS digipeated several messages to me 
through UO-22, a pacsat gateway, APRS, and into the Internet.  Several 
great minds, including Jeff, are working on it.  Stay tuned.

73, Mike


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