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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I did it this way in a home brew transceiver some 25 years ago, and that worked fine. For the trimmers use a small screwdriver or a ceramic one, the procedure to align the PLL is described in the Yaesu Operator and also in the Service Manual, There are some changes to make in the manual: The main dial can be set exact enough, but not quick enough to follow quickly changing talk. With the condenser fully open I had a frequency of around Khz.

If you should obtain a memory module, the only thing you have to change, is pulling the wire off the plug, and connect the plug to the memory module. Mamual receiver has normally a overlap at each range from between 30 to 50 khz at each side from the range, for example at 7 Mhz the receiver tunes from to khz, and other bands have the same overlap at each end.

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I use it also for repainting and refill markings on boat anchor receivers, like the RA and Racal. You can check the age of your FRG if you look at the serial number: The manual says between 1. After changing the diode maanual frequency display was working correctly, and the problem with the clock was solved also. Well, why not tune a varicap in the VFO with the existing circuit?

Is the set very unsensitive, check first the semiconductors in the circuit, or there can be resistor or condenser failure, that is much more likely than misalignment… Closely check for abnormalities burnt or cracked components, bad soldering joints, bad mmanual and other trouble spots. Most of the time the problem is a loss of the frequency coverage, usually at the end of the tuning scale. Just check for a I had a recently a receiver with a bad display driver, and obtained another from Internet as spare, with a defect.

Copies of the User Manual and the Service Manual can be obtained from the Fox-Tango website, by far the best website for all classic Yaesu equipment. So I took the VFO out the receiver, a very easy job, although it means manuao removal of all knobs, scales and front panel.


This modification is very elegant, because there is no drilling or extra knobs necessary, simply undone if necessary, easy to use and has no side effects in stability of the receiver. I have a credo here: While I had the meter out, I searched my junk box, and found a VU meter from an old cassette deck, which was a near- perfect fit.

I did only the listed mods on the mamual board, there are some more on the power supply, but i did not use them, so look at the site eventually. 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: CFJ k6 or, much more expensive: The pages are in German, so I will give a translation of the mods, for the benefit of all of you who are not fluent in that language.

For the power supply board I had 2 options: I cleaned it as far as possible, but the needle stuck every now and then, so I suspected a broken movement, or the coil out of his bearings.

The source for trouble is the rectifier, who becomes very hot, so hot in fact that in one case the manuual to the transformer caught fire, and the condenser exploded. After a careful inspection of the PLL msnual, I saw that the band switch had been tampered with, the switch had been removed and resoldered, but several print traces were pulled off, and repaired with some wires, so I measured the connections and found a broken trace.

The receiver is very rugged and, normal used, there are not much problems.

Yaesu FRG-7700 Instruction Manual

If it is not possible to collect equipment myself, and pay cash, I am not interested, and can better save my money.

In normal use I have the fine tuning in the midposition, so I can tune either way of the station. However, if you don’t have either, skip this alignment, If you receive signals, this section is working. Your Frog has then a very bright green display, that will again last for years. My command of the English language could be better, so I apologize for linguistic mistakes here and there.


I changed all three diodes for 1N types, because they had a bad oxidation of their leads. This last part is a pure audio modification, and makes the audio somewhat higher, and gives a better SSB signal, but for SW broadcast, the audio quality is good as is and need no changes. I swapped the meter scale, and put the meter back. The reasons where bad switching contacts in the mode switch. One of the things I missed on this receivers is a small RIT control or fine tuning, a very handy device when I am listening in on a net or rag chewing Hams.

Well, as things go, this rx had also a display problem, the previous owner told me that he had used the receiving and PLL board himself for a swap, because the power supply of his had blown up, so I expected that I had just got a bunch of spare parts for my other receivers.

I soldered everything spider-style to the tuning condenser.

The adjustments are frg-700 minor in a well-aligned set. I have to see what I buy. 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. A change for 4x 1N or another bridge rectifier is also possible. Painting the front is as a whole is almost impossible, the lettering is printed on the front and is easily damaged. If you want to work on your FRG, it is a must to have the manuals and schematics.

Again, I did not like the result, and changed C to nf. If the receiver is switched off, the display is off, however power to the IC is always on. I took the switch out and removed the back plate. If you check carefully, use the schematics and the very good circuit description in the handbook to make yourself familiar mankal the circuits used.

Service and User Manual – Yaesu FRG – Receiver — Download free service manuals

Remove the power cord first!! The rag chewers are not always at exactly the same frequency, and constantly tuning with the main dial is no fun, because you easily overcompensate, losing all information. By submitting a comment, you are declaring that you agree with these rules:.