Drew Diamond "Simple Superhet RX"

[G0JJI]

Hi Peter,

I think you can trust Drew's work. Can you hear the VFO and BFO using another receiver? Can you inject a signal into pin 1 on either NE602 and see a corresponding signal at the output?

I don't have notes on the NE602 but are those readings in keeping with expected input for the device?

'morning/evening Lou
ok thanks for that I'll give it a go today.  Don't have a freq gen though, but will try finding bfo and vfo on rx as you suggest.
Peter

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gDay Peter,

without being familiar with the exact circuitry, my immediate response is the same as Lou's. Check to see if the oscillators are oscillating. It is a good sign that you are hearing broadband noise... at least some RF energy is getting through! If you can detect output voltage from the oscillator using the RF probe and yet still cannot tune in local signals, this implies that the frequency is wrong.

regards

Ian
VK3YCQ

gDay/good evening Ian
Ok thanks for advice will check oscillating today
regards
Peter