[hpsdr] Penny mirror sigs

[Joachim DL7JP]

Dear all,
 
Mercury arrived a few days ago also at my place, to tnx to everyone who is
involved!
 
So, I went to replace Janus/SDR1000 by Penny and Mercury, and - after
struggling
for a while to find the documentation, Mercury seems to work OK nw, but
Penny is 
creating a mirror siginal:
 
Attached is a screen shot of an Olivia Signal sent at 3593 USB, NF center
frequency is 
1000Hz; as you see, a roughly equally strong mirror signal is sent out 1 kHz
below 3593.
 
Does anyone have an ideas where to look for the problem?
 
Tnx, Joachim.
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