Topband: noise source narrowed down-

[Dinsterdog@aol.com]

No, not the famous 80 meter buzzsaw.......this is the noise I asked for help 
on re: 160 10 KHz hummm yesterday-

Ok, the noise has been isolated to the number one antenna port on the 
Ameritron RCS-4 antenna switch- 

Any one of the four bevgs, when hooked up to it- pick up the 10KHz spaced hum 
which generates a 10 over nine noise- - the other antenna's have it but at a 
very low, almost unnoticable level- 

Disconnect any of the antennas from the number one antenna port- and poof- 
it's gone- as is the slightly detected hum on the other antennas- 

So it takes any one of the four beverages I have, to be hooked up to the 
number one antenna port,  for the noise to show up- disconnect port one, and 
my troubles go away- 

bummer as I thought just switching to the number one port, with or without 
antenna would do the trick to generate the hum.....thinking it was a noise 
rectifier problem...........but if the antenna is not hooked on the port one- 
everything is clean- 

The good news is that it is not a local or regional humm....electri fence, 
cable box etc.......

The bad news is that this is the 2nd Ameritron RCS-4 I've tried that has gone 
bad- the first one almost burned my house down- ...bad AC module.......now 
this one has a simple, I hope, problem to fix- if I can fax the schematic to 
anyone who wants to take a crack at it- let me know- what ever is used to 
filter out any potential AC noise in the unit via the number one antenna port 
seems suspect-- I'd really appreciate any thoughts- thx!! 73  Paul  N0AH



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