Re Radio the Voice of Vietnam (https://mediumwave.info/2024/08/26/vietnam-9/)
I have been told by a reliable source that the transmitters from Dong Hoi were relocated to the new replacement transmitter site. They are Harris/GatesAir DX-200s. One was installed at the time of the original Dong Hoi diplexing, and one later. That later one replaced the original single frequency Dong Hoi transmitter, which was Chinese made, and we were told had been itself relocated from some underground site after the war. It was very similar to Russian transmitters of that era, using high level plate modulation and output tubes (valves) which were vapor phase cooled. The VoV had replaced the original Russian or Chinese output and modulator tubes with American made Eimac ones, purchasing them in Europe when the US government prohibited supply to Vietnam. That transmitter had originally been used (evidently somewhere in China) with a classic 4 element box side-fire parallelogram array with 2 driven towers and 2 parasitics as could be seen from some of the control system nomenclature.
Ben Dawson (2024-09-08)