[RFI] Accessory port RFI
Wescom, Gary" <GRW1@pge.com
Thu, 26 Mar 1998 11:35:40 -0800
One trick that has worked for me is to feedline shield choke to reduce
the RF in the shack. My configuration makes it fairly simple to do
this. My different antenna feedlines all connect to a coax switch which
connects to my tuner which connects to my radio. I replaced the short
coax jumper between the coax switch and the tuner with a coiled coax
choke. This choke is simply 6 or 8 turns of the coax, about a foot in
diameter, taped together. This stopped RF feedback I was experiencing
on a couple different bands on different antennas.
This beauty of this scheme is that it is really cheap and simple to try.
If it works for you, you may simply leave the coil of coax in place like
I do or order one of the fancy PVC pipe encapsulated commercial chokes
that you see advertised in the ham magazines.
> From: firstname.lastname@example.org[SMTP:email@example.com]
> Sent: Thursday, March 26, 1998 8:53 AM
> To: firstname.lastname@example.org
> Subject: [RFI] Accessory port RFI
> Was pleased to see an "Accessory" port on the back on my Icom 737. It
> well with my TNC for packet, rtty, etc. Unfortunately, the
> microphone audio
> is distorted (quite badly, I'm told) when a cable remains connected to
> port. I've tried the Radio Shack chokes which separate in to two
> sections. No luck. Audio is still so bad I just unplug the cable.
> Kelly Boswell
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