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#9
March 25th 11, 05:56 AM
posted to rec.radio.shortwave
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Grundig Satellit 500 - Help needed
On Mar 24, 8:47*am, "D. Peter Maus" wrote:
On 3/24/11 24:29 , wrote: On Mar 23, 5:03 am, "D. Peter *wrote: On 3/22/11 23:18 , bpnjensen wrote: On Mar 22, 4:14 pm, "D. Peter * *wrote: * * *Check the antenna select switch, and the DX/Local switch. It sounds like you have some oxidation in your unit. These switches, if oxidized, will produce the very symptoms you describe, especially true if FM is now working. * * *Throw these switches several times. Move the toggle in a circle until you get some change in the noise. * * *I experience this regularly with my own Sat500. Could you get the same results with a squirt of cleaner in the switch innards? * * You could. Wearing through the oxide is a better solution for serveral reasons. Cleaners tend to dissolve, or at least soften, existing lubricants within the switch, which can cause them to migrate into contact areas, attracting dirt, rehardening into films that interfere with contact. Or worse, creating corrosive elements by chemical actions between the cleaner, the lubricants, and some airborne crap. Which necessitates more frequent cleaning of the switch. Eventually, replacement is required. * * Cleaning may produce a result, but it often comes at a cost of shorter switch life. Real switches have gold plating in the contacts . For real . * *Indeed they do. * *And when those get noisy, it's because the base metal substrate has migrated through the gold and oxidized. In which case replacement is the only option. * *At one station I worked, we bought a Harrison Pro 790 console for the production studio. Tremendous console. But they cheaped out on the switches. * *I had to replace them all. Hundreds. They provided them for us. And they were better switches than had been installed. But WHAT a PITA.- Hide quoted text - - Show quoted text - C'est la vie . |
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