[hpsdr] Tests with simultaneous Penny and Mercury

[Greg - ZL3IX]

Today I brought my laptop home from work, which enabled me to run 
separate instances of PowerSDR, one on the laptop, and the other on my 
home PC.  I have two Atlas boards, each with its Ozy.  On one of them I 
have a production Penny module, and the other holds my main station 
radio which has a version of Mercury FPGA code running in its own Ozy.  
I have about 18 dB of gain in front of the ADC in this arrangement.

I connected an attenuated version of the Penny output at 1.8 MHz into 
the Mercury Rx.  The input level was set to -3 dBm, or S9+70 dB.  I have 
taken a snapshot of the spectrum, and am happy to forward it to anyone 
interested.  If someone can tell me how to put it on to the HPSDR wiki, 
I am happy to do that as well.  There are a couple of close in spurs at 
around 2 kHz spacing, but these are better than 100 dB down.

While transmitting on 1.8 MHz I tuned Mercury to 3.8, 7, and 10 MHz to 
look at the noise floor.  Going from Tx off to Tx on raised the noise 
floor from -128 dBm to -127 dBm, both with a 500 Hz CW filter active.

I then tuned the Rx back to 1.8 MHz and connected my paddle to the DB9 
on Ozy.  While sending a string of dits at 25 wpm, I looked at the S 
meter at spacings of 1, 3, 5, and 10 kHz, checking for key clicks.  The 
dBC readings on the S meter were -60, -80, -90, and -100 respectively.

Does anyone know of any standards against which key clicks are 
measured?  I don't but the results seem pretty good to me.  I also think 
that the close in noise and spurs, and wideband noise are excellent.  
The combined blocking dynamic range of Mercury, and wide band noise of 
Penny, show excellent potential for being able to work in close 
proximity, eg on a DXpedition.

73, Greg, ZL3IX