Total posts : 45366
[quote=PhilB]
These scopes are very sensitive so a wire loop connected between the probe and scope ground will serve well for a pickup. Length of the wire depends on how far your TX is from the scope position.
[/quote]
This is a follow up to the above comment that I previously posted. If you want a monitoring setup for your scope that is selective to eliminate interference from other off frequency stations, you can use any AM radio as a front end to the scope. On older AM radios, you can connect the scope to the output side of the IF transformer. If you have a newer “single chip” radio, connect the scope to the ceramic IF filter. Try both sides and pick the best.
By using an AM receiver, you will get the benefit from the tuning stages to filter out unwanted stations. By connecting the scope to the IF stage, you still get the RF waveform at 455 kHz. As long as the radio isn’t overloading the modulation display will be good.
You can modify your “off air monitor” radio by sodering a short wire to the IF stage and running it out to the back of the radio. You can still use the radio normally. It will just have a scope probe hanging off the back.
