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Hey,
I have to tell you, I used
RG-58 on a commercial repeater the other day. Before the flames read
on.....
I was installing a DB-228 on a
180 foot Rohn SSV tower for a customer as well as replacing their broken TPL 25
in 150 watt output PA. The old repeater was a Kenwood putting out 25
watts, just right for the input but the new Icom was putting out 40 watts, to
much! I had taken the computer to program the lower power but left the
cable in the other computer bag! The drive to get the cable would have
been 120 miles, not an option. Got on the internet and looked up the specs
on RG-58, it was 6. something dB for 100 feet. I called the local Radar
Trash store to see if they had a fifty foot roll of RG-58, they said no but went
and looked for two 25 foot rolls. He came back and said, guess we got some
in because they now had several boxes of the coax. I went to the store,
bought the coax, $19 dollars plus but that was cheaper than the trip for the
cable. I installed the coax, sure enough it dropped it right at 3 dB to 20
watts! I hooked the amp up and it was putting out 115 watts, seems low for
that much input but hey, it worked and what do you expect from TPL!
What lets this work is the 6
MHz of transmit/receive isolation in the system, doubt if you could do this in
Ham service at 600 KHz.
Heck it worked, next time I go
I will make sure I have the cable and computer!
Paul
WB5IDM
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