[hpsdr] FMT and Mercury

[Ken]

I really do not know about the SDR1000 - but consider the following:

the manual for the SDR1000 says microhertz resolution for the DDS (with a 1 
Hz tuning step)

in rough numbers, if you take 2^48 and 200 MHz you get 0.7 microhertz as the 
"granularity" of tuning.

So that would imply that the DDS *is* taking the closest 48 bit number to 
the desired frequency...which is sent to the nearest Hz by PowerSDR.

Mercury, of course, can do the same with some firmware....

Ken



----- Original Message ----- 
From: "Jim Keeth" <af9a at arrl.net>
To: <hpsdr at lists.hpsdr.org>
Cc: <ke2n at cs.com>
Sent: Tuesday, April 07, 2009 00:19
Subject: Re: [hpsdr] FMT and Mercury


> Ken,
>
> I've been playing around with FMT using a home brew version of the 
> SDR1000 receiver.  I haven't tried with Mercury since I don't have a 
> stable  reference yet.
>
> Maybe you know, is the AD9854 synthesizer in the PowerSDR / SDR1000 
> programmed with a 32 bit word or do they use all 48 bits?
>
> Thanks.
>
> 73,
> Jim AF9A
>
> 


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