[hpsdr] Janus frequency response ?
Richard Stasiak
rstasiak at sympatico.ca
Wed Jun 6 16:09:23 PDT 2007
Good work Al, thanks for the information.
Now, my next project is to bypass the SDR1000 op amps and get rid of
the hump.
Rick ve3mm
On 6-Jun-07, at 6:45 PM, Al wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> FWIW ...
>
> Okay. After setting jumpers R2 & R17 on the Janus board Here are some
> new numbers... ( Un jumpered included for comparison )
>
>
> 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...
> R2 & R17 Shorted
> R2& 17 open Before After
> Ref Recal
> Recalibration Ref
> Freq. I&Q 1Khz I&Q I Q
> I&Q 1Khz
> (dbm)
> 1Khz -52.0 0db -38.3 -66.4 -66.5
> -64.0 0db
> 5Khz -53.0 -1 -38.5 -66.5 -66.6
> -63.9 +0.1
> 10Khz -53.0 -2 -38.4 -66.4 -66.5
> -64.0 0
> 20Khz -54.8 -2.8 -38.5 -66.9 -66.6
> -64.3 -0.3
> 40Khz -58.5 -6.5 -38.9 -66.7 -66.6
> -64.5 -0.5
> 80Khz -64.0 -8.0 -41.0 -66.9 -66.7
> -65.6 -1.4
>
> The levels displayed within the pan adapter display where slightly
> different above the DDS Freq compared to below the DDS frequency. The
> numbers reported above are the greater of the two responses.
>
> AL, K0VM
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