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On Dec 15, 2:05�am, Phil Kane wrote:
On Thu, 13 Dec 2007 20:27:37 EST, (Mark Kramer) wrote: The story I heard is that this started because Collins radios had an IF of 9MHz and only needed one set of (expensive) sideband filters to have LSB below 9 and USB above. Mixing to get the final output: F1+F2 gives same sideband you start with, F1-F2 inverts. That's what I was told. The real story is that it was the Central Electronics (CV ??) exciter that had that scheme. Yes, the CE 10A, 10B and 20A exciters all used a 9 MHz SSB generator. They were quite popular in the 1950s. But they could not be the source of the amateur LSB/USB convention, because that scheme does not invert the sideband on either 75 or 20. 73 de Jim, N2EY |
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