07-06-2015, 02:45 PM
Picked up a Heathkit IG-102 RF Signal Gen and have started to check it out. Here’s the schematic link. Someone had cut some of the resistors out of the RF output circuit but I have no idea why.
[Image: https://www.dropbox.com/s/pngawjvlpexny3....jpg?raw=1]
There is also a strange item that I don’t understand and doesn’t seem to be on the schematic. Below is a pic of the circuit where the 680 resistor in question is located and a pic of the resistor with a wire wrapped around it. I was thinking it might be something like the gimmick wire in Philcos but this wire is looped around the resistor AND soldered to BOTH ends, essentially taking the resistor out of the circuit. What’s with that????
[Image: https://www.dropbox.com/s/89ovt749bggtu3....jpg?raw=1][Image: https://www.dropbox.com/s/7gy0lgb1mogprv....jpg?raw=1]
I’m getting 400Hz out of the audio modulation and I can faintly hear an AM radio catch the RF leakage from the unit as I tune through the frequency on the radio so its working, at least to some level. Unfortunately I don’t have a scope to actually look at it.
[Image: https://www.dropbox.com/s/pngawjvlpexny3....jpg?raw=1]
There is also a strange item that I don’t understand and doesn’t seem to be on the schematic. Below is a pic of the circuit where the 680 resistor in question is located and a pic of the resistor with a wire wrapped around it. I was thinking it might be something like the gimmick wire in Philcos but this wire is looped around the resistor AND soldered to BOTH ends, essentially taking the resistor out of the circuit. What’s with that????
[Image: https://www.dropbox.com/s/89ovt749bggtu3....jpg?raw=1][Image: https://www.dropbox.com/s/7gy0lgb1mogprv....jpg?raw=1]
I’m getting 400Hz out of the audio modulation and I can faintly hear an AM radio catch the RF leakage from the unit as I tune through the frequency on the radio so its working, at least to some level. Unfortunately I don’t have a scope to actually look at it.
