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On Fri, 6 Jul 2012, Scott Dorsey wrote:
The VHF transceiver fundamental can be set for the 220 Mhz ham band, but because of the drifting and the AM modulation, they take up pretty much the whole band. Also the spectral purity is... not exactly good. I would not not recommend firing one up today. But that's not really unique to the Model 19. Assuming it's a superregen receiver and modulated oscillator, that sort of thing homesteaded the vhf and uhf bands. They were great when there was little use, they were simple to build and cheap, it got people on the air. And then "civilization" would come along, fancier equipment and a desire for DX. So they were banished from six metres (maybe when it was still 5 metres?) and moved to 112MHz or if after the war, 144MHz, made an impact and then were banished from there. 220 next, to the extent that 220 was ever used, then 420MHz. Those APX-6 radar transponders were more complicated (but had the advantage of being cheap surplus) but did the same thing for 1215MHz, a simple transmitter with a broad receiver to match. Decades later, all those cheap doppler radar gizmos converted for use on the 10,000MHz band was similar. One could even argue that the Heathkit Lunchboxes were in a similar vein, simple and cheap, yet more civilized since the transmitters were crystal controlled. Though of course, there never was a Heathkit produced "220'er" (I'm sure I've seen a modification article where someone put one on 220MHz) or a "420'er" (but there were early CB sets that had similar innards, and one article in "73" about 1968 that was a fairly cheap and easy transverter made out of juice cans that was intended for a Sixer or Twoer. Michael VE2BVW |
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