Topband: Nasty QRM From ??

[Stephen Hawkins]

Jim,

Toggling a switch rather then disassembling two under warranty garage 
door openers and splicing in a non switching supply is a much easier 
solution for me.

Steve

On 1/24/20 2:15 PM, Jim Brown wrote:
> On 1/24/2020 9:39 AM, Stephen Hawkins wrote:
>> I have two new Chamberlain Garage Door openers that have cheap 
>> Chinese switching supplies in them that use the wires to the switch 
>> at the people door and the wires to the sensors at the bottom of the 
>> roll up doors as antenna. Despite toroids and bypass caps they wipe 
>> out 160m.   When I know we are in for the evening I power them off at 
>> the circuit breaker panel.
>
> The better solution is to simply replace those nasty power supplies 
> with old-fashioned LINEAR power supplies, cutting the cable for both 
> the new and old power supplies and splicing the Linear supply to the 
> cable going to the garage door openers. Details on my website, in the 
> app note about building contest scores by killing receive noise.
>
> 73, Jim K9YC
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband 
> Reflector
>
>
-- 
Stephen Hawkins NG0G
ng0g at arrl.net
73 49 111 01001001