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#11
January 24th 06, 04:55 AM
posted to rec.radio.amateur.homebrew
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Astron Power Supply problem
Gudmundur wrote:
In article CNEzf.140599$WH.64582@dukeread01, says... I've got a problem with my Astron RS-20 power supply. With no load, it's fine, but anything above 4amps or so makes it drop way down and my rig drops out of lock. I haven't measured it under load but the rig works ok to 10 or 11 volts so it must be dropping below that. I found a schematic and downloaded it, all the voltages are fairly close to what it says on the schematic with no load, I haven't made any measurements with a load on it. I'll pick up a headlight tomorrow to put a load on it and make more measurements. Does anybody have any ideas? Thanks, Kerry, WD5ABC Is it just simply RF getting back into your supply and causing havoc? Perhaps the supply is O.K.? You need at least 3 headlights to get the supply under a load that compares to your rig. Try more lights and see if it craps out. Nothing normal ever seems to happen to me... I did go out to get a 2nd headlight so I could get about 7.75 amps on it. I found a 1000uf capacitor that had a leg corroded so badly that apparently during the move it wiggled around enough to break loose. I went to the local Radio Shack (which, by the way, has apparently turned into a cell phone store) and they didn't have any 1000uf but they did have some 470uf caps so I put two of them in parallel to get close to see if it mattered. Pins 11 and 12 showed about 8 or 9 volts too low before but now they are right on according to the chart on the Astron schematic. I connected one headlight (3.75 amps) and turned on the supply. It showed 13.59 volts. Then I connected the 2nd headlight (4 amps) and it stayed dead on 13.59 volts. Looks like I'm in business! Somebody has been into this supply before and butchered it, so I may clean up a few things while I'm in it. I guess I should fix that capacitor, the next guy in there will say the same about me if he sees 2 paralleled 470ufs instead of a 1000 uf! THanks for your help guys! 73, Kerry WD5ABC PS This post may look different, I'm on my Linux box out in the shack tonight. |
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