--- On Sat, 5/2/09, va...@securenet.net va...@securenet.net wrote:
From: va...@securenet.net va...@securenet.net
Subject: [Repeater-Builder] desense question
To: Repeater-Builder@yahoogroups.com
Date: Saturday, May 2, 2009, 7:44 PM
Running the hamtronics REP-200 with the optional 15 watt PA
in it.
After all the filtering, I get a whopping 8 watts out.
I put a small strip amp inline with the TX port of the
repeater, before
the filtering, and it caused desense. Maybe tossing spurs -
I have no
way to test. Location is also not great for the moment,
and the antenna
is very temporary. A Diamond x500 connected with COAX
(please dont shoot
me). The club antenna will be down off the old tower (8 bay
sinclair)
and I do have the heliax for it.
The amp is a UHF PA off a mobile rig, and I needed about 50
feet of
RG58U to attenuate the signal from the repeater into the
amp module.
Is this my problem? Lack of shielding causing desense?
When I put
everything back to normal, my test station was solid copy.
What is my best option to get a little more oomph on the
output with out
tossing megabucks at it?
Thanks
Ian
VA2IR
It is probably that 50 feet of rg-58. I have seen desense with as little as 6
feet of rg8 going from a transmitter to the duplexer. You may be able to
bypass the amp section of the Hamtronics or just build an atuenuator in a
shielded box out of resistors.
Guess that you may be able to wrap the rg58 in some tinfoil and see if that
helps with the desense. Not a very good longterm solution, but a way to run a
check.
