[Elecraft] Fwd: Re: Full duplex for Sat work?

[David Giles]

Hello Lyle,

So using the K3 in test mode with the main transmitter on 10m or 6m 
driving a transverter at 1mW and the subreceiver fed from a downlink 
transverter isn't possible?  A pity since I have been using my K3 (and 
K2) on the birds for quite some time but always hoped I could use it 
full duplex.

FM sats may be the primary focus for North America with AMSAT-NA's FOX 
series, the rest of the world is building linear transponders.  (I use 
both types, no need to discuss the merits of either).

73 de David VK5DG

On 18/08/2015 23:48, Lyle Johnson wrote:
> The K3 is not a full-duplex radio.
>
> At the time of the design of the K3 I was hoping we could make it a 
> full duplex radio with external transverters, as I was responsible for 
> and/or participated in the design of several subsystems in AO-40 and 
> other Amateur spacecraft.
>
> The Subreceiver has its own DSP.  The issue is signal isolation 
> between Tx and Rx and a few other
> bottlenecks.  Full-duplex capability would have impacted the cost and 
> complexity of the radio significantly, and would have been a cost 
> borne by all buyers of the product.
>
> Since the initial design time of the K3, the primary focus of most 
> Amateur satellites has been for use with dual-band HTs using FM.
>
> 73,
>
> Lyle KK7P
>
>> It may merit further research. The owner's manual block indicates the 
>> Rx DSP
>> as "DSP2" ? ...
> ...
>> Its tempting to think maybe the sub-Rx could be used duplex with
>> main-Tx in the K3,...
>
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