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[TowerTalk] Thumper

To: <>
Subject: [TowerTalk] Thumper
From: "Merlin-7 KI4ILB" <>
Date: Wed, 12 Jul 2006 21:21:52 +0100
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I know this is not the best place to ask this but I do not want to join any 
more NG's 

 What causes the thumping sound that you can get (I mostly hear it on 20m) on 
HF? They are about 1 secound apart and in perfect time. Last night they were 
about S7 and covered from below 14.225mhz up to about 14.300mhz.

 Just curious..

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