[Skimmertalk] Red Pitaya 122-16 overload levels in CW Skimmer duty

[Jeff Blaine]

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


For those who have the capability to measure, I'm curious as to what 
signal levels with the RP resulted in false spots with CW skimmer server.

I've run the QS1R for years and found the overload level to be around 
the +6 dBm level.  As long as peak signal levels were below that, I had 
virtually zero false spots (here, I mean as an example, the low SNR 10m 
spot at the 2x harmonic frequency of 20m actual frequencies).

The same antenna configuration feeding a pair of RP 122-16 look like 
they are exhibiting overload conditions well under -40 dBm; perhaps as 
low as -50 dBm.

Initial testing of the RP vs. QS1R showed the RP to be a few dB more 
sensitive than the QS1R.  However, given similar hardware typologies, 
I'm stunned at the apparently low level signals required to cause the 
harmonic phantom spots.

Wanted to see if some of you other RP ops had conducted any measurements 
on your unit, and what your experience has been.

73/jeff/ac0c
www.ac0c.com


73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com