[Elecraft] KX2 Satellite Derivative? (Was: Re: The KX2)

[brian]

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 <vr2xmc at yahoo.com.hk>
> To: Edward R Cole <kl7uw at acsalaska.net>, David Anderson
>          <gm4jjj at yahoo.co.uk>
> Cc: "Elecraft at mailman.qth.net" <Elecraft at mailman.qth.net>
> 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:
>      dubususa at gmail.com
>
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