[amsat-bb] Re: Radios for satellite operations

Doug Faunt N6TQS +1-510-655-8604 faunt at panix.com
Sat Apr 17 10:23:37 PDT 2010

Re: K3 full-duplex-  I asked Wayne about this today, at Visalia.

It's theoretically possible in the hardware, but there's a LOT of
software/firmware necessary, and no one is working on that.

It MAY happen, but NOT soon.

73, doug

   From: James Duffey <jamesduffey at comcast.net>
   Date: Sat, 17 Apr 2010 08:13:22 -0600

   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

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