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Re: DDS VFO AD9850 + Arduino


 

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Bfo/vco needs to be 12mhz-lsb offset 1500hz or what you think is best.?

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On 29 Dec 2016, at 07:05, Max Morris vk2xam@... [BITX20] <BITX20@...> wrote:

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Hi all,?
I have received the Bit X 40 for Christmas. What a wonderful TRX. Worked first up with great results. VFO is very unstable so I built another DDS VFO using an AD9850 and Arduino. I have built several of these to use in the MST40, MST80 and KNQ7 QRP radios. They all work a treat. However I cannot get one to work with the BIT X. I have the O/P freq at 5MHz at about 300mV. It does not work. When I connect an RF signal generator up, it doesn't start working till about 1.5V of RF is fed into the board. I have removed L4 from the circuit. Any ideas??
Max VK2XAM.

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