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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There are some things fr-7700 know about the frequency display: Be careful if you buy from Internet, there are many guys who advertise with a receiver in good condition, but when it arrives it is a box full of junk.
It is really mnaual to remove the power cord, otherwise you do not remove all the power, with disastrous results. If I got a spare, changing the IC was done in no time. A FRG with a memory unit has no problem with that, you tune in, push the Memory button and then Memory read.
I have to see what I buy. For the power supply board I had 2 options: Another very good source for free manuals is http: If this IC fails, you are in big trouble, because the manufacturer stopped the production some 15 years ago, and supply is maunal scarce if found at all. 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: After studying the schematic, Manuap suspected a partially defect MC If the end point of each Mhz range is getting lower at the high side of each band, a re-alignment of the first PLL is necessary, receiver receives not higher than or so on the analog scale If only the end frg7-700 at the 5, 12, 20 and 29 Mhz bands are too low, a re-alignment of the second PLL is necessary.
To repair the board, it was necessary to take the PLL board out of the receiver. If you want to work on your FRG, it is a must to have the manuals and schematics. Under no circumstances use metal screwdrivers for alignment of the coil cores, they will ruin the cores. The general alignment can be done as described in the manual, with the proper tools and equipment, it is a straightforward job.
Most of the time the problem is a loss of the frequency coverage, usually at the end of the tuning scale. Several bands were there, but on the wrong position of the switch, 7. Follow closely the procedure in the manual, if the receiver is in a normal condition, the changes should be minor. See for yourself at www.
Yaesu FRG-7700 Instruction Manual
Grg-7700 this site are also modifications, pictures, descriptions and more. I had a recently a receiver with a bad display driver, and obtained another from Internet as spare, with a defect. The reasons where bad switching contacts in the mode switch. 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.
When I tested the output with the counter, I found that the output wire in the connector was broken, so I had to repair the connector Now I had signals on every band, but had another curious problem: Troubles I have encountered so far: I saw one used!!!
This guide is in the true boat anchor tradition, a collection of known faults and their solution, and a story of resurrection of a receiver at my workbench. If they fail once there can be a reason they fail again in the future, nanual putting in a socket is cheap and makes life easier when the need arise.
It seemed to me that both sideband oscillators were running at the same time, but I could not see how, because the sideband switch was working correctly. Direct after filling the lines, I sweep the excess paint off with a cloth saturated with white spirit. You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person’s privacy.
I mounted all on a piece of epoxy experiment board, see the pictures and schematic below. The paint on the msnual plate of the FRG is easily scratched, in particular the sides. I have seen all kinds of junky stuff on e-bay, that was tampered with and sold for high prices, to the chagrin msnual the new owner.
The administrator has the right to edit, move or remove any comment for any reason and without notice. I did it this way in a home brew transceiver some 25 years ago, and that worked fine. Change the band switch to the 20 Mhz band and adjust T for a reading of 7.
Free Service Manuals
The displayed frequency is the PLL frequency 0. In the early versions it was a felt ring, in the later version a spring. Removing the paint altogether from the sides is also a possibility, it can be done with thinner and rubbing with an old cloth, you have just to be manuao with the front itself, the paint there is quick damaged. All of them had higher values from 2.
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.
Yaesu FRV, Yaesu FRV VHF Converter for FRG
This is a survival guide for the FRG, one of the most versatile receivers from Yaesu. So, it seemed that the counter IC did at least something. 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. Dial lamps are long lasting, but they have to be changed now and then.
These terms and conditions are subject to change at any time and without notice. The displayed frequency was the counter input, without the IF offset of khz, and divided by a factor Change C uF to 47 uF, for a higher pitched audio. Well, why not tune a varicap in the VFO with the existing circuit?
Comments 0 No comments yet. I wanted to use the original features, and designed a board, centered around a trustful LM regulator IC and a NPN power transistor. In normal use I have the fine tuning in the midposition, so I can tune either way of the station. Failure to comply with these rules may result in being banned from further commenting.
Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time. The Xtal oscillator was working and at the good frequency.