Purpose. Many of the classic radios of the 1960’s arid 1970’s are still in use. They work well and sound good. The newer modern rigs have many “bells and Whistles”, a lot of them not really useful. But they do have one very important improvement: a digital readout .. The PD-8OO Digital Frequency Display adds this
valuable feature to your older rig.
Description. PD-8OO works with transceivers that have three oscillators in their heterodyne scheme. One usually a crystal oscillator, another a VFO or variable frequency oscillator, and the other a fixed frequency “carrier oscillator” . Three cables bring these signals to the Digital Display where, in two mixers, the exact operating frequency is regenerated. This Is displayed on a six digit numerical readout.
Here are a few pictures of the PD-800 configured for the Heathkit HW101 transceiver.
Here is the power supply that came with the PD800
The operating manual is HERE