Shown here in this Hammarlund ad from the September 1970 issue of Ham Radio magazine is part of the equipment of WCCO-TV in Minneapolis, whoss transmitter was then located in the Foshay Tower. The station had a Hammarlund HQ-180-AX receiver mounted on the rack as part of its frequency measuring equipment. The receiver was used to tune in WWV to zero beat the station’s calibrator. Then, signals were received on the receiver and beat against that calibrator.

The receiver was also used to check the tuning of transmitter multiplier stages, to receive time checks from WWV, and as a backup Emergency Broadcasting System receiver.

Shown in the picture is transmitter engineer Stan Allison, and the letter to Hammarlund describing the setup is penned by transmitter supervisor Gerald King Ellison.