05-22-2014, 04:06 PM
I doubt there is anything wrong with the RF coil. If the coil were to have shorted turns, the inductance would decrease not increase. Therefore you would need more compensator capacity, not less.
Is there anything else connected to the RF coil tuned circuit which would increase the stray capacity?
The other possibility is that the oscillator is running a higher freq than required to track the RF stage. You might try increasing the capacitance of the osc high freq compensator slightly. This would require you to tune the same station in with less tuning cap capacity, which would correspondingly reduce the RF stage tuning capacity. Then the RF compensator could be reassembled adding a small additional capacitance to achieve resonance.
Is there anything else connected to the RF coil tuned circuit which would increase the stray capacity?
The other possibility is that the oscillator is running a higher freq than required to track the RF stage. You might try increasing the capacitance of the osc high freq compensator slightly. This would require you to tune the same station in with less tuning cap capacity, which would correspondingly reduce the RF stage tuning capacity. Then the RF compensator could be reassembled adding a small additional capacitance to achieve resonance.
