[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.
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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