I had to replace T101 in my FRG. The small winding (the one closer to the antenna input) turned out to be interrupted, so I couldn't receive any more in the A band. My attempts stopped a long time ago, so at present time I can't recall all the steps I made to set up a home-made replacement for that transformer. For sure I couldn't use the original tiny coil former. The main winding might even have broken off, while I was handling that delicate component. Both windings, in fact, were made of extremely thin enameled wire. I made my deductions concerning a possible value for the parallel inductance in the preselector (the main winding). I considered the frequencies involved for the A band and the maximum and minimum capacity the variable air capacitor may give, considering how it is used for the A band (I inspected the schematic). Signals on A band came back, but I had to face an imperfection: readings on preselector's scale after adjusting are not coherent with the received frequency readings. I asked for a test a friend of mine owns a FRG-7 as well. So I eventually concluded the mentioned behavior is not normal.
Has anyone here possibly faced and fixed the same issue?
So far I couldn't even find the service manual, but I suppose the alignment procedure for the preselector might be acting on the inductance to tune at the lowest frequency of A band, and acting instead on the trimmer capacitor to align the preselector around 1.6 MHz. I've in mind to get back to work with that receiver. Meanwhile, I tried to ask here, after realizing this is a new place for FRG-7 owners after the Yahoo Groups service was discontinued.
Thanks in advance!
A.
