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Re: [CQ-Contest] Coax Stubs for SO2R

To: cq-contest@contesting.com
Subject: Re: [CQ-Contest] Coax Stubs for SO2R
From: Joe <nss@mwt.net>
Date: Wed, 9 Sep 2015 13:30:17 -0500
List-post: <cq-contest@contesting.com">mailto:cq-contest@contesting.com>
Ok distance from the amp, as described below, can make a difference. on the level of blocking harmonics. Now how about on recieve side if you want say youre on 20 and want to block 40, does this distance still apply? On Field days we just had a "T" on the back of the radio and hooked as needed what stub was needed to block the offending station.

Joe WB9SBD

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On 9/9/2015 9:51 AM, Randall K Martin wrote:
Jeff, regarding stubs on six-pack, I place mine on the six individual band ports. A few are "Tee-d" in right at the SO239 on the six pack, but most are connected with a "T" a short distance away.

I need to rethink this, based on the knowledge that there is a proper distance that the stubs should be placed away from the amplifier output, and that the distance also depends on the tank circuit of the amp. My amps are different, and I couldn't tell you how long the coax lines are between the amps and the six pack without measuring them.

I can say that my stubs do make a difference.

Frank W3LPL can you steer me towards any references discussing how to eliminate RFI from T2X controller boxes? I have three of them.

73 Randy K0EU
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