The fault lays in the Wadley loop section .
You need to ascertain the Mhz VFO is working, this runs from 55 mHz to 85 mHz.
Because your lock light goes out at the higher frequencies, this oscillator seems to be working fine.
The loop amplifiers then need to be checked, this can be done without any test equipment to get you in the ballpark..
Reduce the mHz tuning until the lock light begins to extinguish, and while watching its brilliance, carefully and SLOWLY adjust each coil slug looking for a greater dip in brilliance. The lock LED monitors the RF output amplitude? of the loop amplifier chain and is a very good indicator of output level.
? As this improves, tune further down in mHz frequency and repeat the adjustments until no further improvement. This applies to T109 through to T116. Do not fiddle with anything else, although this radio has quite possibly been a victim of the golden screwdriver.
IF the band pass alignment was the issue, the radio will now receive signals.
The main mHz tuning can next be aligned, also without any test equipment.
Tuning in a known BC AM signal, the slug on the VHF VCO can be adjusted to bring the mHz tuning drum into alignment, and then tuning into a known signal in say, the CB band on 27 mHz, the trimmer capacitor can be adjusted to align the 27 mHz frequency to the correct dial setting.
Once done, the signal BPF and third IF filters can be simply peaked on signal.
On Sat, Jul 15, 2023, at 10:31 PM, Chris Rogers via groups.io wrote:
I have a FRG-7 that has the following non working symptoms. The Mhz led can be tuned out on the upper shortwave bands only, and a few stations can be heard at very low volume. The Mhz led does not go out on the lower bands and and no stations are heard.?
Any clue on where to look for the fault would be appreciated.
