RR-1 Marine Receiver is a commercial grade communications receiver which
employs the most up-to-date (for its time - made 1971-1977) solid state
devices and circuitry and offers complete marine band coverage from 150
kHz to 30 MHz. The received frequency is indicated by a two-speed dia1 that
has accurate calibrations every 1 kHz. Modular construction on easily accessible
printed circuit boards is used throughout the RR- 1. The use of dual gate
MOS-FET transistors in the RR-1 circuitry contributes to its superior intermodulation,
AGC, wide, dynamic range and overload performance. The front panel controls
allow the operator to select frequency, AM, CW, LSB and USB reception. Other
controls include AF and RF gain, accessory crystals, range (band switch),
preselector tuning, AC or DC power, AGC on and off, and an antenna input attenuator.
The RR-1 is basically an SPR-4 that has been optimized, rack mounted and
fitted with crystals to serve the marine user. Osterman states that
it is very scarce.