Originally Posted by EduardoLM

Good day to everyone! This is my first post in this forum, and I would like to apologize if this question is too basic or naive.

I have acquired 2 used Futaba radios (2DR model) and also some Futaba receivers (R122JE model). They are AM and supposedly calibrated for the 75MHz band.

However, they work erratically, and the behavior changes as I swap crystal, transmitters and receivers. I think they need to be calibrated.

Since I have some electronics knowledge, I would like to ask about the general procedures on how to calibrate both transmitters and receivers. I suppose I have to tune LC filters for a narrow output for the nominal frequency, to maximize power on that frequency and reject nearby frequencies.

I also suppose I need and RF generator, oscilloscope and/or a spectrum analyser to do the job.

Am I on the right track? Is there any info, manual or online tutorial on how to do that?

Many thanks!

Eduardo