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 -----
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
