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Most trendy ham rigs have a voice activated transmission (VOX) mode, though we don’t know many individuals who use it usually. When a transmitter is in VOX mode, it begins transmitting while you speak, after which, while you pause for a second or two, the transmitter turns off. Many elderly ham transmitters, although, didn’t help VOX, so Heathkit bought the VX-1 “digital voice management” so as to add VOX to older transmitters. [Jeff Tranter] reveals us inside a clean-looking unit.
These gadgets have been bought from 1958 to 1960 and used tubes and a selenium rectifier. The gadget is linked between the microphone and the transmitter. It additionally sat between the receiver and the speaker to mute audio whereas transmitting. The unique unit had a screw terminal to connect with the surface world, and a number of the screws had stay line voltage on them. The unit [Jeff] examines is modified to have phono jacks together with a couple of different repairs.
The wiring seems to be like a tube radio. Tubes are above the chassis, and point-to-point wiring is beneath. There’s additionally an uncommon sealed selenium rectifier. [Jeff] reveals how the gadget works utilizing only a receiver. A number of minor repairs have been wanted.
In case you are focused on getting your ham license, most trendy radios help VOX out of the field — no rhyme meant. We do, nonetheless, love that previous Heathkit gear.
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