[hpsdr] Janus frequency response ?

[Ahti Aintila]

Al,

Are you sure that the jumpers JP2 and JP5 are placed properly to short
the 39k input resistors R2 and R17? If not, short the resistors and
make a new measurement.

73, Ahti OH2RZ


On 06/06/07, Al <K0VM at arrl.net> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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
>
>
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