This manual is downloaded from the FoxTango site, Yaesu. FRG HF Receiver. Survival Guide. Revision 2 march. If you want to work on your FRG, it is a must to have the manuals and schematics. See: The manuals are very informative and deal. The purpose of this manual is to provide the reader with information critical to the nance of the FRG general coverage communications receiver.
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Change C uF to 47 uF, for a higher pitched audio. Under 2 Mhz the FRG is in my opinion very unsensitive, and if I want to do some Dx-ing in this band, I use my RA receiver, I will try to make my FRG at least as sensitive, it will be the next mod project, and I will update this page, when I have everything figured out.
First I had to construct a new power supply, because the owner had thrown away the mmanual board, but fortunately had still the original transformer, complete with burn marks and burned wires.
In normal use I have the fine tuning in mnual midposition, so I can tune either way of the station. I made a truth table of the 6 input pins of the MB, and soon discovered that pin 15 had no true 0 or 1, but had manaul a voltage of 3. I put in a couple of protection diodes over the LM, for safety reasons. Change the band switch to the 20 Mhz band and adjust T for a reading of 7. After rebuilding, I will try some modifications, to improve selectivity and test some ideas of my own, like a clarifier, improve sensitivity for the AM bands and others.
Yaesu FRG-7700 Instruction Manual
By submitting a comment, you are declaring that you agree with these rules:. Problems with this IC are almost always man-made, like a short during the change of the light bulb in the VFO, see above or poking around in the set with the power cord attached.
Frh-7700 the band switch at the 5 Mhz band and adjust T for a reading of 7. Eventually you can use bulbs with short wires and frg-7700 them to the existing long wires after cutting away the old bulb, using isolation tube or crimping tube to isolate the wires and joints. The displayed frequency is frgg-7700 PLL frequency 0. There are some things to know about the frequency display: Check the soldering joints from the bridge, in the board, they can have some cratering, soldering them trough with a soldering iron, is then the solution.
This is a survival guide for the FRG, one of the most versatile receivers from Yaesu.
PLL Reference oscillator Adjustment: Compared with my other FRG, the signals were almost the same strength, so I spent some time to clean the chassis, knobs and front panel, and rebuild the set. The mahual resolution of the display is 1 khz, so there is always a frequency difference of khz between the true and the displayed frequency.
Web Master Fox Tango International. This is very impossible to repair, so I clean the plates rigorously and after frf-7700 use a good automobile wax to make the best of them.
If it is not possible to collect equipment myself, and pay cash, I am not interested, and can better save my money. CFJ k6 or, much more expensive: The Xtal oscillator was working and at the good frequency.
YAESU FRG INSTRUCTION MANUAL Pdf Download.
The only manjal that can give trouble after longer use are the mechanical parts as switches and controls. After a day on there is no warming-up, and stability of this receiver is now the best of the lot. I then build in the VFO a small circuit with a VHF varicap that was on hand BBand a small ceramic condenser 12pf over the existing vrg-7700 condenser. Another very good source for free manuals is http: It is really necessary to remove the power cord, otherwise you do not remove all the power, with disastrous results.
Rub it dry with an old cloth. Standby 10W 10W ON: Adjust T for a reading of 7 volts on the meter. For the rest of the mods it is necessary to remove the receiver board from the receiver. Yaesu uses a amber filter, to change the color in the style of all their equipment of the time FTZD, FT This tube has a filament, and has in the long run the same problem as all tubes: The only critical part in this mod is the ceramic condenser, it must be a type with a neutral temperature coefficient NP 0, black dot.
All mode communications receiver. See pictures from this mod.
The paint on the front plate of the FRG is easily scratched, in particular the sides. Well, why frh-7700 tune a varicap in the VFO with the existing circuit? Your Frog has then a very bright green display, that will again last for years. I checked the resistance of fdg-7700 movement and even that was almost the same.
If step 8 and 9 is done, you have to re-align T09 and T10 for maximum signal. You see seldom a R with a display failure, because they use a different board layout. You can obtain a used one in good condition for a affordable price on ham fests or on Internet. The S-Meter was also not functioning properly, and after taking it out, Maual saw that the movement was just a block of rust. If your display goes weak, you can solve the problem temporarily by removing the orange filter in the display window.
So I took the VFO out the receiver, a very easy job, although frg-770 means the removal of all knobs, scales and front panel. I just hope that I could help anybody to maintain his FRG in good condition. After inserting the board, I checked the bands, and now I had several more bands with signals.
To get access, you have to disassemble the front panel and the analog dial.