Note
73, Apr 1963, p. 39.
Only a few examples of Multi-Eimac's ATR-4 SSB transceiver were manufactured. The 80-10 meter rig ran 180 watts PEP input on SSB, 75 watts on AM, and 180 watts on CW with a pair of 6146s.
No actual advertising for the ATR-4 has been found as of this writing (2026). The following text appeared in a promotional piece ( "A Survey of Transceivers") published in the April 1963 issue of 73:
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The MULTI-ELMAC Model ATR-4 Transceiver provides complete coverage of the 80M through 10M Amateur bands. Upper and lower sideband operation with excellent carrier and sideband suppression marks the basic design, but AM (USB with carrier) and CW with adjustable sidetone completes the requirements of the most versatile amateur.
The features, to mention a few, include:
VOX
Manual keying
Break-in CW
100kc calibrator
Adjustable VFO dial drag
A unique PTO with a tuning ratio of 20kc/turn is nearly linear and is mechanically superior in design. An overload indicator that measures final amplifier grid current provides a positive visual indication of flat-topping and simplifies adjustment of the mic gain for optimum clean output. The indicator aids the tune-up procedure and shows the 100% modulation level for AM operation.
The sideband generator has good long term carrier suppression requiring no field adjustment. Sideband rejection and additional carrier suppression is obtained with a 5.420mc crystal filter containing six crystals. The audio characteristics are shaped to provide a high intelligence power level and a crisp sound on-the-air. The final amplifier contains a pair of 6146's in parallel operating into PI network with adjustable antenna loading.
The receiver utilizes a product detector and optimum AVC characteristics for SSB operation. Receiver shift control provides a plus and minus 1 kc tuning of the received frequency independent of the transmit frequency.