[TowerTalk] RCS4 Antenna Switch - Noise

[n8de at thepoint.net]

Sounds like the diodes and coax are rectifying RF from some strange,  
outside source.
Try putting bypass capacitors across the diodes in the remote unit.
73
Don
N8DE


Quoting K0YR <k0yr at tomrieff.com>:

> T/T,
> This RCS4 has a built in power supply. No wall wort. When switching
> unit is brought in to the bench, there is no noise, only when placed at
> the tower. Noise goes away when power is off or in the #4 default
> position.
> Just curious if anyone has experienced this before???
> Tom, K0YR
>>
>>
>>
>> On Mon, Nov 24, 2014 at 2:58 PM, K0YR <k0yr at tomrieff.com   
>> <mailto:k0yr at tomrieff.com>> wrote:
>>
>>    TT,
>>    I inherited a RCS4 Antenna Switch from an estate.
>>    When first installed it generated noise when using the 1,2 or 3
>>    switch positions. The default is #4.
>>    Did some Google'ing and found discussion about corrosion on the
>>    SO239's mounted to the base plate.
>>    Ran a ground wire across the SO239's to the circuit board. Cleaned
>>    up some of the other connections.
>>    All seemed well and much improved. This past weekend the noise
>>    returned and was sometimes intermittent.
>>    Switch is located about 450 feet out at the towers. Fed with 7/8
>>    hardline.
>>    This unit was manufactured in 1992, so could be anything.
>>    Any thoughts on what I may be missing or failing in the switch to
>>    eliminate the noise.
>>    Tom, K0YR
>>
>>
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