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WWV (5 Mhz, LSB) receive was off frequency on the rig I am working on.

Instructions are straight forward, no special equipment, just an antenna and able to receive WWV 5.0 Mhz (likely easier after dark - at least in North America).

An alternative would be to input using a signal generator, but would need to offset by 1.5 KHz to zerobeat since this this receiver is set to LSB for receive. It helps if listening during the minutes when WWV is broadcasting a tone and have a 2nd (calibrated) receiver to match the tones by ear.

Also adjusted (zero beat) the marker at the same time, as stated in the manual.