Authored by VE3EFJ
10.2 VARIATIONS
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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