I used to repair some of these devices while still active in this hobby. What I found was that merely tuning for the highest IF level was not the right way. The range of the radio often will be reduced due to noise etc. I managed to get hold of some service manuals from suppliers, and found it the best to follow their adjustment procedures. You might find that they will provide you with alignment/testing procedures if you ask. Maybe they will charge a small fee for photocopies only.rehan said:I have to tune receiver for radio control aircraft , freq: 72mhzFM.
2. Then after demodulation i should tune for max output or after IF stage i should do that .
3. the signal i am receiving is PWM so i canot adjust sine wave.
4. How to detect if ceramic filter is working alright because many times after crash of model the filter is faulty and it gives gittering signal output.