Yaesu FRG-7700 Survival Manual
Communications receivers
Hide thumbs
Also See for FRG-7700:
- Maintenance service manual (137 pages) ,
- Service manual (53 pages) ,
- Instruction manual (36 pages)
Advertisement
Quick Links
Advertisement
Related Manuals for Yaesu FRG-7700
Summary of Contents for Yaesu FRG-7700
- Page 1 Yaesu FRG-7700 Survival Guide PAØPGA...
-
Page 2: Specifications
SPECIFICATIONS Frequency Range: Audio Output: 150 khz - 30 Mhz in 30 bands 1.5 Watts ( 8 ohms, 10% THD) Modes: Speaker Impedance: AM, SSB (USB, LSB), CW, FM 8 ohms 4 - 16 ohms for external speaker or headphone Sensitivity: SSB/CW 0.15 - 0.3Mhz... - Page 3 73’ Wim Penders PA0PGA Description: The FRG-7700 is a compact communication receiver, for the reception of AM/SSB/CW and FM signals between 150khz and 30 Mhz. The receiver is very sensitive and stable, and has a pleasant audio. It has no special bells and whistles, but is designed with the shortwave listener in mind.
- Page 4 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. If you want to work on your FRG-7700, it is a must to have the manuals and schematics.
- Page 5 Rotate the dial to the “0” position and check the voltage, it will be around 2.4 Volts. The manual says between 1.5 and 2.0 Volts, but none of the four receivers I tested were in that range. All of them had higher values from 2.25 – 3.1 volt and are working fine, so I let it at that.
- Page 6 Be Careful: Remove the powercord first!! The lamp of the VFO is mounted in a small reflector that is very close to the soldering side of the receiving board and this lamp is always “glued” to the grommet from the heat of the lamp, so changing is very difficult.
- Page 7 Under 2 Mhz the FRG-7700 is in my opinion very unsensitive, and if I want to do some Dx-ing in this band, I use my R390A receiver, I will try to make my FRG-7700 at least as sensitive, it will be the next mod project, and I will update this page, when I have everything figured out.
- Page 8 PAØPGA...
- Page 9 PAØPGA...
- Page 10 PAØPGA...
- Page 11 A FRG-7700 adventure ( a resurrection story of a FRG-7700) I had a recently a receiver with a bad displaydriver, and obtained another from Internet as spare, with a defect. 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 powersupply of his had blown up, so I expected that I had just got a bunch of spareparts for my other receivers.
- Page 12 with some wires, so I measured the connections and found a broken trace. To repair the board, it was necessary to take the PLL board out of the receiver. While I was at it I measured all diodes and inspected the rest of the board very carefully.
-
Page 13: Fine Tuning
I checked the resistance of the movement and even that was almost the same. I swapped the meter scale, and put the meter back. The only change was the connection, it was reversed on the new meter. The FRG-7700 was now working again, so I did a tune-up according the manual, surprisingly, it needed not much re- alignment. - Page 14 This modification is very elegant, because there is no drilling or extra knobs necessary, simply undone if neccessary, easy to use and has no side effects in stability of the receiver. I can recommend this mod and have now done it to all my FRG-7700’s, except one, who had the memory module installed.
- Page 15 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. This is the resurrected FRG-7700 in my shack PAØPGA...