[time-nuts] Changing FE-5650A frequency?

[Don Latham]

wow, a little more picking will get you to the dds pinout wrt the 24-bit
programming word...

Alexander Wright
> On 07/04/13 15:10, Herbert Poetzl wrote:
>> The purpose of the polymer foam is isolation to keep a
>> stable temperature throughout the boards.
>>
>> http://www.qsl.net/z/zl1bpu/PROJ/FE5650-2.jpg
>>
>> The top layer in this image is the DDS board, and it is
>> basically identical to the FE5680A, which means it can
>> be adjusted in a wide range, but only does digital synthesis
>> based on the reference frequency.
>>
>> But let's see what Bill says to the pictures ... :)
>>
>> best,
>> Herbert
>>
>
> Herbert, the board doesn't seem to be the same, the chips which are
> visible don't line up with the ones in that picture. Anyway my curiosity
> got the better of me and I dug through the foam some more to find a long
> row of DIP switches. I bet i can change the divider ratio with some
> combination of those:
> http://m0tei.co.uk/fe5650pics/IMG_20130407_170929.jpg
>
> Also, you can see that the chip is an AD9955 DDS chip:
> http://novatech-instr.com/PDF_files/AD9955.pdf
>
> -
> Alec
>
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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
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