16-11-2019, 07:31 PM
To get back to the subject of this thread-further checks on the 114 showed that it's L.O. is off by about 300-400kHz -the upper end of the MW band is at around 1300 kHz rather than the 1600 it's supposed to be. The alignment doesn't appear to have been tampered with, so my first suspects are the oscillator trimmer (which does have an effect on the frequency) an it's two parallel padder caps, one of which is 180pf, the other 47pf. The fact that the L.O. won't tune above about 1300kHz suggests to me that either there is too much capacitance present, or the inductance is too high, but why?? I can check the capacitors on one of those Chinese Testers, but not the inductance Any ideas, fellow members??
