[Amps] RF Interference

Pat Barthelow aa6eg at hotmail.com
Sat Oct 11 12:41:43 EDT 2008

Hi Bob,

How about salvaging an instrument grade brute force line filter from an old piece of gear, I dont know if they exist in Computer switching supplies, but I tore apart some really old instruments, that had the Industry standard 3 blade connector that accepted the molded cord.  If that brute force filter  is grounded to your enclosure- cage,  that may help.  Then next, maybe a high pass filter between the antenna and the box. 

All the best,   Pat Barthelow   AA6EG    Skype:  sparky599Please note my new phone number:(530) 878-7056; aa6eg at k6bj.org

Jamesburg Moonbounce Team


> From: bmaser at tampabay.rr.com
> To: amps at contesting.com
> Date: Sat, 11 Oct 2008 11:53:28 -0400
> Subject: [Amps] RF Interference
> This may be a little off target for this reflector but maybe someone can 
> offer up some advice, and it IS RF interference from a RF amplifier so here 
> goes.
> When we moved into this home about 6 years ago the garage door opener went 
> belly up in the first 3 months.  I immediately went down to Home Depot and 
> caught a sale for a Genie Excelerator garage door opener.  It was neat 
> because it goes up really fast and has all the whistles and bells.  About a 
> month later I noticed that when I would go key down with the 3CX3000 amp it 
> would freeze up the opener and in order to unfreeze it, all you had to do is 
> trip the circuit breaker and reset it and all was well again.  Just talking 
> on SSB never seemed to bother it.  It was a pain in the *** so I called the 
> Genie folks and they sent me a replacement board.  The new board had the 
> same problem.  At that point I started putting ferrite cores on the power 
> cord and on the wires that go to the door button.  Nothing helped.  Next I 
> built a cage out of 1/4" mesh and installed that around the whole motor/PC 
> board unit.  This helped somewhat but it also made the wire antenna less 
> sensitive so it would only activate the door when you got within 20' or so.
> During all this time, I was having monthly phone conversations with the 
> Genie "Tech Support".  They have logged 11 calls from me and they have just 
> told yesterday me that  they can't help me and they suggest that I go out 
> and buy another opener.
> Has anyone else experienced this sort of problem and come up with solutions? 
> FYI, the 115V that the opener is hooked up to is a dedicated line with no 
> other circuits going any where into the house.  Just for kicks, I plugged it 
> in to a wall circuit in our kitchen using a extension(with ground) and it 
> still freezes up when the amp is being used.  Barefoot doesn't bother it at 
> all.
> Any and all help will be greatly appreciated.
> Bob Maser  W6TR 
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