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Re: [TowerTalk] US Tower Up/Down Raising Fixture (MD-750) Motor Switch

To: Patrick Greenlee <patrick_g@windstream.net>
Subject: Re: [TowerTalk] US Tower Up/Down Raising Fixture (MD-750) Motor Switch
From: Charles Gallo <charlie@thegallos.com>
Date: Tue, 1 Jan 2019 16:29:36 -0500
List-post: <mailto:towertalk@contesting.com>
Had, I miss mercury wetted contactors. Carbon contactors also don’t stick, but 
have higher resistance
--  
73 de KG2V
Charlie

> On Jan 1, 2019, at 4:21 PM, Patrick Greenlee <patrick_g@windstream.net> wrote:
> 
> I did not propose a relay.  I was thinking of up-sizing the wire sufficiently 
> to obviate a relay.  I concur with your low opinion of the A/C contactors.  I 
> have replaced some of those too. Brute force switching and HD wire run.  
> Reliable and not prone to failure.
> 
> Patrick        NJ5G
> 
>> On 1/1/2019 1:03 PM, Richard (Rick) Karlquist wrote:
>>> On 1/1/2019 10:45 AM, Patrick Greenlee wrote:
>>> As you mention, upsize the wire and operate in the dry.  This assumes that 
>>> you aren't at the ragged edge of too much wire loss now.  Probably not but 
>>> you could grab a meter and make sure.
>>> 
>>> Patrick        NJ5G
>>> 
>> 
>> The trouble with what you describe is that if the relay
>> sticks on, you are too far away from the tower to
>> kill the power and stop the motor.  The type of relay
>> used is the same as is used in air conditioners, and
>> AC relays are famous for sticking on.  On my HDX-5106,
>> the relay has stuck on twice.
>> 
>> 73
>> Rick N6RK
>> 
> 
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