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The crystal spec is 3rd Overtone so I assume it would prefer the overtone then, however it is over 30 years old.
Question is will replacing the crystal with a new one get it oscillating again? Other than the crystal and the transistors there are only passives which tend to be very reliable.
The circuit comes from the Yaesu FT-480R 2m transceiver so would have worked as designed. I certainly agree that the oscillator on the bread board wasn't tuned to create the 3rd overtone, I was simply testing the crystal to see if it worked at all. To see it oscillate at the fundamental seems...
I didn't think a crystal would behave like that but it was worth asking the question. The binary combination goes from 0000 to 1001 so I'll have to check this is working correctly and not pulling it to far out as you say. I can confirm I'm using TP11 to test the output. Looks like I may have...
I need some help with a crystal oscillator which is being very stubbornand not oscillating. It is part of a PLL and has a crystal with 63.9151MHz written on it. The manual says the crystal is a 3rd overtone which is not surprising at this frequency. The circuit seems to be a Colpitts...
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