Well if the red LED is extinguishing that means at TP110 you have enough signal. But it is a tad complex this radio. May I direct you to articles in Short wave magazine written by JL Linsley Hood. September and October 1981. The first article explains how the
radio works and the second one how to align it. You need to do some research to understand the circuitry. And I would advise against tweaking any coil slugs or caps you until you know what you are doing. Connecting a sensitive longer scale voltmeter across
the S meter is a good method when aligning the set.?
First off check out the power supplies. The mains transformer is centre tapped and full wave rectified. The DC then passes through S5-b, to Q411 via the choke. There is about 17v here. The voltage regulator delivers 10v which generally supplies much of
the circuitry. Just after Q411 is zenor diode D413 which develops the 9v line. ?This is found on the green wires under the audio board. This voltage is the supply to the HG oscillator box that generates the MHz signals and also the 2-3MHz oscillator board
with Q201. The IC Q106 mixes the 2-3MHz signal and the comb of frequencies coming from Q301.?
I will stop here as Lindsley Hood explains it all very clearly.
Mike G4THN
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On 13 Jan 2025, at 10:43, Miguel Frutos via groups.io <m.frutos@...> wrote:
?
Thanks Mike for the hints which were?very helpful.
I followed your procedure without success: the lock light would never go off (sometimes it would just dim a bit). After touching VR102 as per instruction booklet, the light goes off correctly in every frequency?configuration, but still nothing is tuned.
I need to keep troubleshooting
Regards,
Miguel
El sáb, 11 ene 2025 a las 0:11, Mike Anthony via
(<g4thn=
[email protected]>) escribió:
The stuff under the electrolytic caps looks like glue that was used to hold them in place before they were soldered. Look at the top of such caps. Any convex shape is bad news, they should be dead flat on top. First connect an antenna!?
If it was working before try the following. Select one of the four bands. Say band C 4-11MHz. Rotate the MHz knob to centre 7 under the curser with the red lamp off. Rotate the preselect knob to get maximum response. There are numbers there to assist.
Finally use the main tuning dial to show half way between 100 and 200. The set is now tuned to 7.150MHz. Tuning around this figure during daytime will almost certainly bring up strong amateur stations. To resolve the SSB, switch the mode switch to LSB. You
will need safe crackers fingers for this and the fine tune control helps here.?
To tune an AM broadcast station switch to either AM or AM/ANL. In general the ATT and TONE switches should be in the centre position.
If none of this works you may have a problem!
Best of luck, they are remarkable receivers.
Mike G4THN
Sent from Mike's iPad
?
Hello,
I collected a FRG-7 yesterday. I thought it was in better shape and probably overpaid?for it (EUR100).
The overall aesthetic condition can be improved:
- It's painted in black.
- The power switch cover is missing. And the light dim cover and shafts are missing.
- the rubber feet, from bottom and side are missing.
- The carrying handle is missing.
- The rear lugs to keep the power cord are missing.
I think all this can be improved. When switching on I can't tune anything, although the previous?owner sent me a video of it working fine, so I guess I have not been lucky yet.
There is something under the power capacitors, I'm not sure if this is because they are leaking. Also, some pads seem to be missing in the PCBs (not sure if this is a concern or not).
I think everything is fixable. I appreciate?any help or hints you can provide.
Regards,
Miguel
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