I seem to recall this was functionality was available way back when (>10
years ago) for a two rig satellite setup.
From memory (perhaps faulty):
There was a software program which compensated for the Doppler shift
with an RS232 link to the downlink radio. No correction was made to the
uplink radio.
There was also one or more program(s)/hardware board(s) to control the
EL-AZ rotors (various outputs so that most rotors could be controlled).
I do recall using the downlink Doppler shift compensation program. It
worked fine in the CW mode I tested. I abandoned it because it was easy
enough to manually tune the radio to follow the Doppler on 70 cm downlinks.
Didn't use the rotor control hardware/software with the U100 (clack box)
rotors I had. They were easy enough to manually operate. Set the
declination rotor, track azimuth in steps for a while, reset declination
rotor etc. An available satellite tracking computer program gave the
needed elevations/azimuths.
"Integration" was an exercise for the user. Some guys did indeed
integrate the all the pieces. I found it unnecessary to do so.
Biggest pain was waiting for passes of the few useable birds available.
Guys interested in something narrow bandwidth modes would perhaps need
to refine the old technology or maybe not. Moonbounce programs
apparently compensate for Doppler.
73 de Brian/K3KO
On 5/25/2016 16:04 PM, Edward R Cole wrote:
Johnny,
I was actually planning to try doing exactly that: use my K3+432
transverter with KX3-2M. But this is new territory which no one has
ventured. First one would need sw to interface the radios, then sw to
link to satellite tracking sw, and also a program that would provide
both inverting and non-inverting dual band frequency tracking. The UHF
radio needs to change frequency at a faster rate than the VHF radio in
order to compensate for Doppler. Just linking VFO's will not do it.
I'm not a programmer so that would depend on patching together from
other sw and I kept putting that off.
I had wanted a dual-band mobile radio to replace radios I had sold in
buying transverters which don't cover the full band. I figured one with
cross-band duplex would get me back with a usable satellite radio (but
only FM).
There are a couple sats that have linear transponders for SSB/CW use
though not in high earth orbit (Heo). That thinking morphed into my
acquiring the old FT-736R which adds all-mode operation and CAT.
The KX2 got me thinking how nice a dual-band VHF/UHF KX3 would be (doing
duplex would add extra nice).
Somebody will marry the two Elecraft radios some day for full cross-band
duplex.
Date: Wed, 25 May 2016 11:33:24 +0000 (UTC)
From: Johnny Siu <[email protected]>
To: Edward R Cole <[email protected]>, David Anderson
<[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: [Elecraft] KX2 Satellite Derivative? (Was: Re: The KX2)
Instead of developing a new radio for SAT. ?Can there be a device that
can link two elecraft radios for up / downlink of SAT?
In the past, CT16 can link Icom IC275 and IC475 to work as a pair.
I think this route will save a lot of R&D for a new radio.
73
Johnny VR2XMC
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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