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Beat heard at some frequs
I can hear a whistle in some frequs in one band for example 53 and the same noise at 30mhz.. ¿is something beating with the synth?.. ¿maybe a small audible delta between the tx side step osc and the reference fss that modulates the tx vco?.:roll:
Hey guys, ive tried my best and the prc77, looks fine now, but i dont trust her so much... fss problem may apear again another day.
Ive got a PRC77A (25khz version), is someone here familiar with it?, couse despite i know the basic changes and new fss system with only a xtal reference to tweak...
Did you change the tuning capacitors?, the frec control mechanism? assure the correct capacitance ratio? Im not sure capacitro and vco of different brands are interchangeable from one radio to another, if you have a RCA ill put an rca a39 a38.... Capacitance ratio could also afect loop stability...
Yep, if they are not damaged enough....
I only have found partial solution, if you calibrate 39 the book way... it wont help, couse probably your problem is on the frequency tuner gears that dont fix the capacitor the same point all the time, at least it seems to create too much error for the...
Not an easy task guys, that was my theory but if you have yours, i will be greateful of reading them. Fss unlocks, even if you cal it like the manual says, i close the radio, the, days pass... then radio unlocks one day and when i open the radio i find out that fss is now locked haha... sick!
I have seen it, but it dont help for this anyway, what they say is that if you use diferent brand of tandems with an a39 they could send you 1mhz low or high becouse of the diferences between manufacturers. I thing thats not that matter. Alignment is very clear as i have said at the manual, but...
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