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Date: Sat, 26 Dec 1998 14:47:48 -0500 (EST)
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>From k3lr Sat Dec 26 14:47:46 1998
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To: blackburn@qnet.com
Cc: W2YR@aol.com, rfi@contesting.com
Subject: Re: [RFI] PC keyboard RF immunity?
Message-ID: <19981226.144558.3382.1.KD6ZZ@juno.com>
References: <199812252024.MAA29049@cello.qnet.com>
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From: kd6zz@juno.com (steve godwin)
To: <rfi@contesting.com>
Date: Sat, 26 Dec 1998 14:47:41 EST
Your suggestions given to W2YR regarding the problem with keyboard
immunity were impressive. I am hoping that you will be kind enough to
give me some suggestions on another type of problem I have just about
given up on solving.
I operate the only 220 MHz repeater in Monroe county. The coordinated
frequency is 224.26 minus 1.6 MHz (which is the standard offset for the
220 band plan. ) We have a local 500 watt AM station here, WKWF, which
is about 3/4 of a mile from my QTH. When the repeater comes up the
repeater output frequency beats with the signal from WKWF and the
negative component comes in on the input (1.6 MHz). I have tried
by-passing the coax shield, open stubs, shorted stubs and a helical
resonator-- all to no avail. I am convinced that the problem is not
coming through the power supply or the autopatch phone line. I am using
9913 coax up to a 14 element beam on a 45 foot tower. I previously was
using an omni-directional Ringo Ranger and the problem was the same with
the Ranger. I am using a set of WACOM duplexers which have been factory
tuned and checked for attenuation.
This situation makes the repeater almost useless and I am not supposed to
re-broadcast WKLY on the 220 ham band - HI!
Any suggestions would be greatly appreciated.
Please reply to KD6ZZ@KWest.net.
Thanks and Happy New Year
73,
Steve - KD6ZZ
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