I have no way to prove this, but there's reason to believe that the noise
problem is specific to the M2 controller (or, rather that it doesn't deal
properly with the noise.) Green Heron told me that OR2800 rotors will not
have the noise problem with their controller and that they've sold many
controllers for OR2800 rotors and none has had the problem. Accordingly, I
purchased a GH controller for use with my OR2800PX via more than 350' of
standard rotor cable and have never had a noise or missed pulse problem. The
good news is that M2 will sell the rotor without the controller (at least
they did when I bought mine.) I've seen the M2 controller fail at a number
of installations, so I believe there are other good reasons to go with GH.
The GH alternative is more expensive, but well worth it in my opinion.
73, Dick WC1M
> -----Original Message-----
> From: Jim Brown [mailto:jim@audiosystemsgroup.com]
> Sent: Thursday, April 22, 2010 11:04 AM
> To: Tower and HF antenna construction topics.
> Subject: Re: [TowerTalk] OR2800 rotor cable
>
> 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
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|