SteppIR makes a high voltage supply for long cable runs. And the cable [is]
wound with pairs, they give the ohm-out in the book and it is on line.
For a rotator, I used the Alpha Spid and a Green Heron controller. This is a
great Controller, I did some beta testing for them, works great. I could turn
the Alpha Spid rotator a mile away if I wanted, with 4 small wires. I really
don't like the Alpha Spid all that much, but for a long cable run it would work
good. You just raise the DC supply voltage to get it to turn about 1 RPM. The
Spid is made "rough" in many ways, and mine would not fit a 2 inch mast, I had
to bore it out! But it is also made strong. The mail gear looks like it came
out of a truck's rear end! And, after having it up for a while it still works,
I guess that is the bottom line.
David F. Branson
Senior Technician
Action Communications, Inc.
Tucson, AZ
520.792.0326
520.792.2709 fax
KC0LL@comcast.net
www.kc0ll.net
www.ActionCommunications.com
"America will never be destroyed from the outside.
If we falter and lose our freedoms, it will be because we destroyed ourselves."
--- Abraham Lincoln
Freedom isn't Free, Support our Troops
----- Original Message -----
From: Jim Brown
To: TOWERTALK@contesting.com
Sent: Sunday, May 10, 2009 10:26 PM
Subject: Re: [TowerTalk] Rotor for Long Cable Run
On Sun, 10 May 2009 20:18:48 -0400, john@kk9a.com wrote:
>I would be more concerned about whether the SteppIR will work properly
>with that long of a run.
Hi John,
Thanks. I'm concerned too. FWIW, I am disgusted with the mfrs of all of these
products, including SteppIR, for not publishing specifications for what is
essentially a simple Ohm's law problem that all of their customers need to
solve when doing due diligence. It is a very simple matter to specify the
currents involved, the output of the controller, any adjustment that is built
into the controller, and the IR drop that can be tolerated. Starting current?
Fine. Specify it.
I'm told that SteppIR cable is paired, but there's no indication of which
conductors are pairs. In fact, if I wanted to order my own #18 rather than
use
their #22, I wouldn't know that from reading their documentation. BTW -- if
their cable is a foil shield with drain wire, that drain wire can couple RF
shield current onto the signal pair by a mechanism called Shield-Current-
Induced Noise.
Ohms Law still works. Give us the data on the product so we can use it!
73,
Jim Brown K9YC
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