Not sure if I'm measuring the output of the DDS correctly or not. ?I'm measuring the brown wire that's connected to the Raduino's red wire and I'm showing a crusty 909.1 kHz signal. ?My BITX40 has never received anything other than noise and distorted signal at one frequency. ?Red light is "ON" on the Raduino. ?All circuits have be traced and it seems to be the DDS output?

Mark W5MCU

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This is perhaps the fourth time we've had an Si5351 come up at something like 1mhz instead of 4.8mhz. ?My best guess is that that 25mhz reference crystal near the Si5351 has failed and needs to be replaced, but that is just a guess. ?Here's some other threads on this:

/g/BITX20/topic/4525558

/g/BITX20/topic/4526026

/g/BITX20/topic/4526172

> You are seeing feedthrough from the 900 MHz that the 25 MHz is multiplied to for the frequency dividers.

If so, that Rigol scope is greatly exceeding spec, I may have to go buy one. ? ;-)