The FRR-26 is also designated the R-517.
Although I have repaired this set and it works well, I have no documentation, schematic, approximate age, or information on how it was used. I am assuming it was used in the late 50's for teletype or CW. With the right crystal (or VFO?) this should work well for a QRP frequencyin the 80 or 40 meter bands.
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