POH VIH equipment
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From the Mercury, Wednesday, August 12, 1925 Radio Notes "I was surprised to see that the American ships were fitted with the old-fashioned navy selector, which is still in use on some of the land stations, and is a feature of the installation of VIH." In the radio progam Bright Sparks a WW1 operator mentioned using a receiver with three crystal detectors - he preferred the "perikon". The Kurrajong Radio Museum (http://www.vk2bv.org/museum/) has a "Tuner C" apparently built about 1917, but which contains what looks like a three crystal detector. So the POH receiver probably looked something like that.