|
|
Post by modeng2000 on Nov 4, 2023 7:46:10 GMT
No longer required
|
|
SteveW
Elder Statesman
Posts: 1,458
|
Post by SteveW on Jun 23, 2024 12:09:38 GMT
Just found this one ...
In the old days I believe the kit to use would be a "Grid Dip Oscillator". As I recall its a bit like a little transmitter in the general range of the target tuned circuit frequency which, demonstrates a "dip" as the thing is tuned through the the resonant frequency of the target tuned circuit. At resonance the "unknown" tuned circuit draws energy/power from the source and this is registered on a meter as a "dip" or drop in a meter reading.
|
|
|
|
Post by modeng2000 on Jun 23, 2024 13:23:05 GMT
Steve, you are quite right about using a GDO to find resonance. I bought a beaten-up one from eBay and refusbished it.
A replacement scale was needed that I was able to toch up and print together with making a missing coil from the set.
Someone had been inside and rewired parts of the circuitry but now back to normal.
John
|
|
