Re: [Repeater-Builder] 220 MHz E F Johnson 529

[Scott Zimmerman]

 Snip.... I got almost 800 milliwatts out of the transmitter/exciter, I am going to feed that into a Japanese RF module when I get the power control working where it won't burn the module up.   Paul,   Instead of turning the power set control down to 200mW to drive a typical M57776 power brick, consider using the additional power to drive multiple modules. If you run about 400mW of drive and use a power divider and combiner to run two bricks in parallel, you'll have an amplifier that works great and makes about 75W.   If you're really adventurous, use 3 splitters and 3 combiners to run 4 modules with your 800 mW of available drive. That should make you about 160W or so. If you have sufficient receiver sensitivity or multiple receivers to support the additional transmitter coverage, it'll make a great system.   We built a 50W version for a customer in Tucson. He's at (I think) 9000' AMSL. I think he told me his repeater covers 3 states and 2 countries!!   YMMV   Scott   Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 ----- Original Message ----- From: Paul Finch To: Repeater-Builder@yahoogroups.com Sent: Tuesday, February 14, 2006 11:16 PM Subject: [Repeater-Builder] 220 MHz E F Johnson 529 Hello,   I got a wild idea to build a 220 MHz out of a Johnson Fleetcom 529.  So far all my repeaters are Johnson, why not the 220?  Well it's been fun so far.  I found out that most of the multiplier tuning string from a UHF 559 worked really well to replace the coils to get it to tune to 220.  I also replaced the last multiplier transistor and predriver with the transistors from the UHF unit.  I got almost 800 milliwatts out of the transmitter/exciter, I am going to feed that into a Japanese RF module when I get the power control working where it won't burn the module up. YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.