hip hip<br><br><div class="gmail_quote">On Thu, Aug 27, 2009 at 9:38 PM, <span dir="ltr"><<a href="mailto:john.foege@gmail.com">john.foege@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I'd like to share with you all how amazing lighting is. What I had expected was the surge traveled down the dog fence wire and jumped into the RG-8 on the ground over the top of the buried loop. Yes even in the wet ground in a huge copper loop, it created enough to blast a pinhole discharge through the RG-8s dielectric and down into the ICOMs HF antenna connector.<br>
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What I noticed today when I shipped the ICOM out for service, was that it also jumped out of a screw on the ICOMs top chassis into the Mirage 80 watt brick amp that was sitting near it -- torching little black marks everywhere it went.<br>
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It also managed, as I looked more carefully at my gear to totally kill my Astron!!! Not cool!!<br>
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So, being ever hopeful, I thought that, most likely, everything in the Astron likely survived except the LM723 regulator chip. I called up Cables and Connectors, and they had one left in stock. An NTE923, which is a pin compatible replacement.<br>
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I grabbed it and dropped it in. Voila! The Astron fired back up. I adjusted the voltage trim pot to get it up to 13.8V.<br>
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I wasn't satisfied, however, with just seeing that it fires up and reads 13.8V. I wanted to test it under a full load. Not having a 0.3 ohm 550 watt resistor handy, I racked my brain all day, and even tried to build a salt-water resistor, which worked only marginally well.<br>
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Finally, my dad and I came up with the idea of using a transformer as a ballast, and he suggested the 1kW microwave xformers I have in the basement.<br>
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I wired up the Astron to the primary coil as a big fat wirewound resistor and cranked her up. She comes up at 40 Amps 13.8V and is humming along fine.<br>
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I'm super happy about this and thought I'd share!! In the future, if your Astron gets spanked by lighting, try the LM723 first!<br>
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73s John<br>
Sent via BlackBerry by AT&T<br>
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