[hpsdr] Janus frequency response ?

Al K0VM at arrl.net
Wed Jun 6 13:14:48 PDT 2007


FWIW ...

I feed an HP-204C audio gen directly into the Janus I/Q input connector 
Input).  I with 145mv from the sig gen, I read the following levels as 
reported at the bottom right of the Power SDR (1.6.3) pan adapter screen...

Freq.    I(only)  Q(only)   I&Q              Relative to 1Khz I&Q
1Khz    -54.7    -55.1     -52.0 (dbm)        0db
5Khz    -55.0    -55.2     -53.0                 -1
10Khz  -55.3    -55.4     -53.0                 -2
20Khz   -57.3   -57.5     -54.8                 -2.8
40Khz   -61.4   -61.4     -58.5                 -6.5
80Khz   -67.2   -67.5     -64.0                  -8.0

The levels displayed within the pan adapter display where slightly 
different above the DDS Freq compared to below the DDS frequency.  The 
number reported above are the greater of the two responses.

AL, K0VM



 1181160888.0


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