Authored by VE3EFJ
The SPR4 also had some variations from the desk top model marketed as marine back up receivers known as the RR1 and RR2 receivers.
The RR1 was a rack mount white SPR4.
Thr RR2 was an RR1 with a 500kHz step synthesizer (consider it an RR1/SPR4 with an FS4).
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