[TowerTalk] Thumper

Merlin-7 KI4ILB merlin-7 at sc.rr.com
Wed Jul 12 16:21:52 EDT 2006

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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