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#37
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loran questions
"Doug" wrote in message ink.net... "Lynn Coffelt" wrote in message ... "Larry" wrote in message ... Bruce in Alaska wrote in news:bruceg- : well, if your rich and famous..... I am rich and famous. I use Yaesu ham radios...(c; They come with LSB and 10 Hz steps, not 100 or 1Khz. Heck, that ain't nothing! My RME4350 goes 20 times further than that....... just during warm up. Lynn W7LTQ Ever thought of trying some zener diodes or solid state regulators in it to see if stabalizes? Do is have VR type gaseous regulator tubes? It been a few years since I peeked inside an RME. Doug K7ABX Well, it does already have VR tube plate regulation for the oscillators, but the irritating drift was caused by heater voltage changes. A less than brilliant attempt was made to use back-to-back zener diodes regulating the various oscillator AC heater voltages (using a separate higher voltage filament transformer too), but that turned into a real power hog, and did not deal with the varying duty cycle of a clipped AC voltage. Biggie, of course, was the awful RF noise generated by this brilliant idea. Completely saturated the front end (and probably the mixers and IF too) The RME has been resting under a dust cloth, on a storage shelf for about 40 years now (in three countries and four States). Old Chief Lynn, W7LTQ (et al) |
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