[hpsdr] Further Information: Help Needed: PowerSDR TX FrequencyInaccuracy

David McQuate mcquate at sonic.net
Sat Jan 12 09:40:47 PST 2013

The calculations in the FPGAs of Hermes, Mercury, and Penny that 
determine frequency up- and down-conversion have finite resolution, 
which might result in small frequency offsets from the ideal.

On 1/12/2013 6:36 AM, Tokio Endo wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> Hi All,
> It's very strange. Even with Penny and Metis, when I transmit 3.530 
> 000, the TX frequency is 3.529 9989, 1.1Hz down from the displayed 
> frequency.
> In other frequency the measured one may be correct in the transmission.
> In the firmware of Penny there might be some error, or frequency data 
> to Penny.
> It is very very fundamental issue.
> Is there any comments on that?
> 73
> Tokio Endo
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