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Re: [Amps] RF Interference

To: <>
Subject: Re: [Amps] RF Interference
From: "Carl" <>
Date: Sat, 11 Oct 2008 13:25:26 -0400
List-post: <">>
If all else fails hire an illegal alien to open and close the door as 
needed (;


----- Original Message ----- 
From: "Pat Barthelow" <>
To: "Bob Maser" <>; "AMPS" <>
Sent: Saturday, October 11, 2008 12:41 PM
Subject: Re: [Amps] RF Interference

> 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;
> Jamesburg Moonbounce Team
>> From:
>> To:
>> 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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