02-02-2013, 11:28 AM
The oscillator is working for sure.
Could try adding capacitance in 10 pF increments across the antenna up to 50 pF. If no better that would mean the loop has too much inductance to start with. Inductance of the loop could be reduced by removing turns but will likely be a tedious process.
The math is involved is straight forward if you want to take that approach. Will need to have a way to measure the capacitance of the gang section and the donor loop inductance. This is where a LCR meter is useful.
Typically for a radio like this the antenna gang section will about 100 pF at 1000 Khz on the dial. Loop inductance works out to around 253 micro Henries.
Could try adding capacitance in 10 pF increments across the antenna up to 50 pF. If no better that would mean the loop has too much inductance to start with. Inductance of the loop could be reduced by removing turns but will likely be a tedious process.
The math is involved is straight forward if you want to take that approach. Will need to have a way to measure the capacitance of the gang section and the donor loop inductance. This is where a LCR meter is useful.
Typically for a radio like this the antenna gang section will about 100 pF at 1000 Khz on the dial. Loop inductance works out to around 253 micro Henries.
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