[Amps] RF Interference
aa6eg at hotmail.com
Sat Oct 11 12:41:43 EDT 2008
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
> 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
> Any and all help will be greatly appreciated.
> Bob Maser W6TR
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