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Re: [TowerTalk] OR2800 rotor cable

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] OR2800 rotor cable
From: Les Kalmus <w2lk@bk-lk.com>
Reply-to: w2lk@bk-lk.com, "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Thu, 22 Apr 2010 12:01:51 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Absolutely. You let Jeff know which rotator you have and he 
pre-configures it.

Les

Al Williams wrote:
> I wasn't aware that the Green Heron controller could be used to turn the 
> OR2800 rotator!
>
> k7puc
>
>
> ----- Original Message ----- 
> From: "Les Kalmus" <w2lk@bk-lk.com>
> To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
> Sent: Thursday, April 22, 2010 8:32 AM
> Subject: Re: [TowerTalk] OR2800 rotor cable
>
>
>   
>> One leg of the circuit is grounded, which would be the shield if using 
>> coax.
>> I did not have the noise problem using unshielded multi conductor cable
>> until my controller failed and M2 "upgraded" it to the current version.
>> Without going into the details, none of the fixes they sent me helped.
>> Some people have reported that the noise is not a problem when using
>> coax (i.e., W3LPL).
>> Rather than running another wire, I switched to a Green Heron controller
>> which makes no noise using the original cable.
>>
>> Les W2LK
>>
>> Jim Brown wrote:
>>     
>>> On Thu, 22 Apr 2010 10:49:59 -0400, Les Kalmus wrote:
>>>
>>>
>>>       
>>>> These pulses are a notorious source of noise when the rotator is in 
>>>> motion.
>>>> M2 recommends shielded cable, i.e. RG-58 to suppress that noise.
>>>>
>>>>         
>>> Interesting. That's very different from shielded twisted pair. Question: 
>>> Is
>>> the circuit ground-referenced? If so, RG58 is probably the best solution. 
>>> If
>>> it's balanced, a good twisted pair should work as well.
>>>
>>> 73,
>>>
>>> Jim K9YC
>>>
>>>
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>>>       
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