[CQ-Contest] The King (Packet cluster network) is dead! Long live the Kin...

Pete Smith n4zr at contesting.com
Wed Jul 28 14:42:22 PDT 2010

A K3 with the separate subreceiver and N1MM Logger will come pretty 
close to doing this now.  You send a CQ, listen on both receivers for 
the receive interval, and if you hear anything on the subrx, you 
pounce.  You may lose your run frequency, because you can't keep it busy 
while listening to the pounced-upon station, but it's kind of fun for a 
reformed SO2R op.

73, Pete N4ZR

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On 7/28/2010 2:30 PM, RT Clay wrote:
>> (SO2R does of course force a different strategic decision:
>> which other band will you do your S&Ping on?  Until
>> someone works out the technology to S&P
>> on the same band on which they're CQing.  I'd bet
>> someone is already doing that but hasn't yet released their
>> secret!)  (I've done it in the ARRL DX
>> but only while running QRP)
> Easy: current hardware has the capability to do in-band SO2R at any power level without the need for far-remote rx antennas, super filters, etc. All that is needed is a wide-band SDR hooked to the IF output of the transceiver. The trick is to use the recording/time-delaying capability of SDR:
> When in RX mode, the system continuously records a slice of the band, keeping a certain amount of time slice (<30 seconds needed in practice) in memory.
> While in TX mode, the computer plays the recorded slice back to the op in split headphone audio as if it was a second rig on another band. The op can then virtually tune through the samples, identify callsigns that are needed, and input them on a bandmap, all while transmitting at the same time. When ready to work a S&P qso, the computer just loads that freq into the 2nd rx vfo.
> Not quite as efficient as cross-band SO2R because you can't really listen when you are transmitting, but I think it could come very close.
> Someone just has to write the code. There are lots of other ways SDR can be used "unassisted" in logging programs as well.
> Tor
> N4OGW/5
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