![Rockwell Collins Pro-Mark ORIGINAL KWM380 HF380 KEYPAD MINT [REV-D] Hamradio](http://thumbs.ebaystatic.com/pict/260944562173_0.jpg)
The 75S-1 receiver and 32S-1 transmitter, comprising the heart of the S/Line, operated separately or together to transceive. The units included crystal bandpass filters and a new compact PTO design that provided stable, highly linear tuning across 200 kHz band segments. The S/Line tuning dial mechanism was unique when introduced. It used concentric dials and a gear mechanism that provided precise dial resolution, better than 1 kHz. Collins had introduced additional S/Line components, including the 30S-1 kilowatt power amplifier, the 30L-1 desktop power amplifier, and the 62S-1transverter, which provided coverage of the 6 meter (50 MHz) and 2 meter (144 MHz) amateur bands. The KWM-2 transceiver replaced the KWM-1 using many of the S/Line’s design features and matching its styling. Other accessories included speakers, microphones and control consoles.
