Yaesu FRG-7 Communications Receiver

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I have ordered two VLF converter kits and this radio will be dedicated to being this use in the future. The last photo on this page shows the coil that was damaged. I also suspected both T102 and T104 were damaged.

I saved an Ebay search for anything to do with FRG-7 and after a lot of faulse leads I eventually found a fellow in Western Australia who was wrecking one and I bought the RF board. It arrived in good condition and was complete with the pre-selector band switch still wired to the board. It took me about a year to get "Roundtoit" and I also fitted an IEC power connector and a better 2.5mm DC connector. It was a lot of effort working out where every wire went but after about two hours of drawing diagrams and slowly taking the old parts out and fitting in the new parts the FRG-7 worked again, almost how Yaesu intended. The lowest band still does not work and I have not had time to see if it was something I did or a legacy of the efforts of "Harry the Ham".

The first two photos above show the new RF board fitted and the third image shows the Bi-Colour LED modification.
This can be found on this web site

The added slow motion drive made tuning from one end of a 1MHz segmet quite a pain and it was quite tight. This FRG-7 has the Fine Tune control, missing from early versions of the receiver, and this makes tuning SSB signals easy. The addition of a 10pF capacitor between th circuit and the control lowers the tuning range making SSB even easier to resolve. The added slow motion drive was suggested for these early versions but a better plan would have been to add a Fine Tune control rather than butcher the main tuning shaft and the metal work. I removed Harry's addition but had to turn up a shaft extender to repair the damage he had done. The original shaft is 6mm and the Harry cut it short and bored out the BIG tuning knob to quarter inch for the reduction drive he used.

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Written by and Copyright, Phil. Storr © Last updated 17th April 2016