We used a TU-50 splitter and two SAV-15 power modules and modified the existing driver. We ended up with about 73 watts and turned it down a bit. Also used a form of the Wilkinson combiner for the outputs. We ground and polished the existing heat sink to mount the modules on and we know it's just about bullet proof. One at least two occasions the RC-210 controller keyed it all night. No problem.
You can read all about it on K7IOU Dave's page http://home.comcast.net/~micorrepeater/ de WD7F John in Tucson ----- Original Message ----- From: "Kevin Custer" <[email protected]> To: <[email protected]> Sent: Friday, October 16, 2009 6:08 PM Subject: Re: [Repeater-Builder] Radio conversion to 225MHZ > K5IN wrote: >> Kevin, >> >> >> Any suggestions for a decent quality 220mhz amp for repeater duty? >> >> Micor 20-25 watts drive or pull the PA and exciter in and 50-60 watts >> output? > > For 50 watts, we use two Japanese power modules and Wilkinson power > dividers for splitting and combining. We build an IPA that supplies the > required drive for the two modules, it's a one transistor buffer that > puts out about 1 watt but it's output is variable from 1/2 watt to 1 > watt. This drives the two modules in parallel and the output is > combined with another Wilkinson. > > I think Scott has pictures - it was never "officially" written up that > I'm aware of. > > Kevin > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.421 / Virus Database: 270.14.20/2441 - Release Date: 10/16/09 18:39:00
