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Noisy Guest
On Sat, 03 Jan 2004 11:52:46 GMT, Shortwave Sportfishing
wrote: On Sat, 03 Jan 2004 04:15:31 GMT, (Larry W4CSC) wrote: On Fri, 02 Jan 2004 13:02:37 GMT, Shortwave Sportfishing wrote: Until the transformers go soft. ;) S'plane to me how transformers "go soft"?? You've been around as long as I have, don't tell me you've never had a transformer loosen it's windings, or the varnish disintegrate on the wire causing transformer noise - both RF and mechanical. A buzzing loose core doesn't change transformer operation, that I ever saw. Hell, if that was so, half the flourescent lights in any WalMart would be dark! Heck, I've got a Astron RS-30a under my desk that is noiser than hell and has been since I bought it WAY back when. :) Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. I don't use analog, series pass regulated power supplies, here. The ham shack 12V equipment all runs off a bank of 90-year-old Nickel-Iron cells I got from a demolished Holiday Inn. They provide about 800AH at 14VDC and are charged by a WalMart automatic shutoff 10A charger all mounted under the house. This power supply provides the 120A 14VDC to power my highly-modified TenTec Hercules II solid state HF linear amp, about 650W OUTPUT. It also powers all the VHF, scanners, and other 12V toys cluttering up the desk. It's hooked to a 1KW Tripplite UPS that powers the desk light and computers/monitors/modems/routers and other network toys in power outage. The lights in here don't ever blink...(c; One of my neighbors came over to ask if I knew why the power was off. Seeing my computer running on the net, he thought his house was down. I told him my power was off, too, and I had called it in. Batteries don't hum and go ballastic with high voltage to destroy everything like series-pass analog power supplies....yecch! Later, Tom S. Woodstock, CT ---------- "I object to fishing tournaments less for what they do to fish than what they do to fishermen." Ted Williams - 1964 |
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