Hi Hank, There is a series diode on the RXTX board to guart against the reverse power supply polarity problem so you should be ok. When the power supply is connected with the right polarity, what current is supplied to the RXTX board in RX mode?
73, Tony KB9YIG ----- Original Message ----- From: hczerwick To: [email protected] Sent: Sunday, June 01, 2008 12:56 PM Subject: [softrock40] HELP! RXTX 6.2 Finished my kit yesterday. Did all the prelim tests in the Builders notes up to testing the receiver part. Everything checked out. Went to hook it to the windows computer with Rocky. I rarely use windows as I'm mostly a Linux guy. I do have a second computer here with XP on it. Noticed I had driver issues with the sound card. Got that straightened around. No luck with the RXTX. Played with the jumpers a bit. Still no luck. Put it away for the night. Here's the stupid part on my part. I had two bits of end leads from caps soldered in the power in part of the board. I had a old end from a dead computer fan that fit on there nicely. It was a 3 prong plug. Until I hooked the coax up then I had to plug it on backwards for it to fit. Well this morning I decided to go back to testing square one and in seeing how many mA draw there was I inadvertently reversed the polarity. So now when you go and test the resistance between + and ground it behaves like you are charging a cap up. Starts out low resistance and builds until it's off the chart. Have I fried the whole works? Or do you think I may have just cooked the voltage regulator? Any thought appreciated. Hank AB2XG
