[amsat-bb] Re: Radios for satellite operations

James Duffey jamesduffey at comcast.net
Sat Apr 17 07:13:22 PDT 2010

Can the K3 do full duplex in the same band? Elecraft's FAQ seems to indicate that they do not support this mode:

	"Can the subreceiver provide unbroken audio using any antenna input while the K3 is transmitting?'

	"This is "full duplex" operation, which is very difficult to do inside a single cabinet. However, it may be possible if 	you're using the transverter I/O (0 dBm TX power). We'll be testing this case and will post full specs later." 

Does the firmware support this?

I am very interested in your experiments. Will you need to modify the DEMI transverter IFs? - Duffey

On Apr 17, 2010, at 12:44 AM, Edward Cole wrote:

> Of course, each to his own choice.
> I decided on the K3/10 (10w version of the K3), with subreceiver and 
> transverter interface (and a few other goodies) ...total $3000
> Add a new DEMI 144/28 xvtr $500, and later a DEMI 432/28 xvtr kit 
> $400.  These are the new design to be released in early June.
> I added a ARR 50-Mhz preamp and building a 300w HF amp kit (cost $150).
> When I have fully investigated running the K3 for full duplex under 
> sw control I will consider letting my FT-847 go.  Keeping it for now 
> (also because I will not get the 432 xvtr right away).
> Why not the Flex-500 + U/V?  Well, cost is one, and the need to have 
> a computer was another.  I will use my 6-lb. K3 for portable mw 
> operation (mainly CW) so its size, weight and ability to be fully 
> used without toting along a computer.
> Undoubtedly the K3 and Flex-5000 are the top radios in the amateur 
> market as far as performance specs.  I've had my K3 for about a month 
> and am still learning more about it.  Its a keeper.  (better be as I 
> will never spend this much on ham radio, again)
> 73, Ed - KL7UW

James Duffey KK6MC
Cedar Crest NM
< jamesduffey at comcast.net >

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