Well, I must humbly submit my most recent gaff. It's nothing like landing long on a short runway (yikes!), but it relates to my inquiry on troubleshooting my JPS NIR-12.
For several days now, Don W3FPR has been trying to help me figure out why power was not being applied to this unit. It was thought to be a bad diode running in series in the 12 volt line. Why was I getting 13 volts on the anode and virtually no volts on the cathode side. It was as if there was no ground on the cathode side of the circuit. I tried shorting the diode which made an impressive smoke job of an electrolytic capacitor shunting to ground. Well then I retraced my steps. I discovered that when I pulled the unit out of the shelf, the Radio Shack modular power plug (which goes to a 'wall wart') came off the 2-prong saddle on the wire. I merely plugged it back in the saddle. The AHAH moment came when I checked the polarity of the plug - I had accidentally reversed the polarity of this plug (VERY easy to do with these modular plugs). The diode was simply doing what it was designed to do - protect the unit against dumb things like this. In the immortal word of Homer Simpson - D'oh !!! Don, thanks for being SOooooo patient with me !!! 73, Jamie WB4YDL _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
