Quote:
Originally Posted by old_tv_nut
Going nicely!
... If you short the 820 pF you could also measure the self-resonant frequency, although you will have to correct the result due to the scope probe capacitance.
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Measuring the self resonant frequency is an interesting thought, The original peaking coils are machine wound in a pattern to minimize self capacitance. My winding is by hand bunch wound which inevitably will affect self capacitance.
It would be interesting to compare a coil I make by hand with a NOS Merit machine wound coil which is first made to match resonance with the 820pF and then tested for self resonance. The peaking coil is designed to resonate with the circuit self capacitance hence my winding may skew in-circuit performance.
This will all become apparent on the final I and Q channel frequency sweeps.