The Collins 75S-3C is a versatile receiver with exceptionally sharp selectivity and operation in any of three modes - SSB, CW and RTTY. AM reception is provided, and the passband can be optimized by the installation of an optional 3.1, 4.0 or 6.0 kc Mechanical Filter. Two CW mode switch positions with optional plug-in filters offer up to three degrees of selectivity in the CW/SSB function.
The 75S-3C Receiver can be combined with the 32S-1 by using its VFO and can add exstra cristals to work many frequecy rangs. An optional 200 cps crystal filter is the best choice for CW operation. Transmitter and 312B-4 Station Control to make a completely integrated station. The 312B-4 has many functions as for Sperker T/R control F/R Power meter Phone patch control Station mute.