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ID: hamfest find DDS-DRIVEN SYNTHESIZER 10 MHz
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wd5jfr:
I can't find anything about it Googlng description or photos of it or the pcb. It powers up and the displayed frequency can be changed but no output. Really not sure what this unit was designed to do. Any info appreciated.
Thanks
Hank
bingo600:
The interesting part would be the SMD Chip , but we can't see the "ID"

To me it seems like there is an unpopulated component near A1 / C12 , that could have been an Oscillator.
Any chance that the Coax connected there , is connected to the REF BNC ??


If yes , then i'd try to inject some 10MHz to the REF BNC

/Bingo
ebastler:
Any hints on the backside of the PCB?
PA0PBZ:
The SMD chip looks like a AD9850 or family member, the ref clock input is indeed at pin 9 and it goes to the coax near the A1 designator. A basic AD9850 uses a 125MHz reference so maybe it needs something higher than 10MHz to output the correct frequency.
coromonadalix:
yeah same here,  9850 or 9851  controlled by a PIC

the problem would be to find the non compiled code ......  must came from many projects found on the web


you seem to have an transistor going into the filter line to smooth out the output frequencies, but we dont see the other side of the pcb for this section

just find theses dds ic's datasheet and follow the signal lines,  maybe there is  a selection to enable or disable the dds output ???
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