[TowerTalk] OR2800 rotor cable

[Al Williams]

I wasn't aware that the Green Heron controller could be used to turn the 
OR2800 rotator!

k7puc


----- Original Message ----- 
From: "Les Kalmus" <w2lk at bk-lk.com>
To: "Tower and HF antenna construction topics." <towertalk at 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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