Here's a 144MHz 1.5Kw water-cooled LDMOS amplifier putting out full power in a June VHF contest, with me operating at W2SZ/1. It was a cloudy day, and the amp was so cool, in fact, we were worried about condensation. Look at the size! The power supply is a 50v/50a surplus PC supply off of ebay. The amp was built by Brian Justin, WA1ZMS.
I have found cold plates on the surplus market. Every once in a while, Electronic Surplus Sales in Manchester, NH has em. Amp in Action: https://www.youtube.com/watch?v=vegBv6ddAUA 73 Gerry Hull, W1VE | Hancock, NH USA AKA: VE1RM | VY2CDX | VO1CDX | 6Y6C | 8P9RM <http://www.yccc.org> <http://www.yccc.org/> <http://www.facebook.com/gerryhull> <https://plus.google.com/+GerryHull/posts> <http://www.twitter.com/w1ve> On Sun, Dec 14, 2014 at 6:32 PM, David Cutter <[email protected]> wrote: > > I'm a little surprised that folks in this group haven't suggested liquid > cooling for this modest application. Semiconductor cold plates have been > around for a long time, are economical to use and in my view a much better > solution than forced air cooling. They are compact, quiet, require far > less cabinet space, keep junctions cooler and more stable than air could > ever and enable higher reliability. > > Look at Aavid for instance, whose devices I used on many occasions: > http://www.aavid.com/sites/default/files/products/liquid/ > pdf/liquid-cold-plate-datasheet-hicontact.pdf > > If you play your cards right, you can cool the amplifier and the power > supply on a short 4-pass plate. Put the heat somewhere convenient, not in > your shack. > > 73 > > David > G3UNA > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
