[Towertalk] M2 2800P-A

[Brian Petku]

Al,
I ran into the same problem as you when I originally installed my M2 rotor.
In my case I have a bundle of waterproof romex going out to my 130' tower
which is 350' from the house. The problem is that PWM noise (mine is DC
motor type) from the motor leads was coupling into the pulse circuit. If you
look at the signal with a oscilloscope you can see the PWM noise. Since one
side of the pulse was ground, I connected both outer conductors of the romex
(3w x 16ga) to ground and used the conductor in the physical center of the
romex for the pulse. It cleaned up the PWM noise and the reading is
accurate. .

Hope that helps..

73,
Brian/W8WD


----- Original Message -----
From: "Al Baker" <w5iz@yahoo.com>
To: <towertalk@contesting.com>
Sent: Monday, March 04, 2002 8:25 PM
Subject: [Towertalk] M2 2800P-A


> Learned colleagues,
>
> I just installed a M2 2800 rotator and am having a
> devil of a time getting the display to track with the
> antenna position.
>
> My the cable run on the tower is 140 feet and from the
> tower to the house is another 180 feet for a total
> cable run of 320 feet.  I broke the cable at the base
> of the tower to eventually install lightning
> protection.  There is no lightning protection in the
> circuit at this time.
>
> I am using 2 x 12 and 2 x 16 for the 4 control wires.
>
> The antenna tracks perfectly with the box at the base
> of the tower on the 140 foot run, but goes haywire
> when the 180 foot run to the house is tied in.  I
> checked the run to the house and it is perfect.  I
> also ran another separate 180 foot run to the house
> today and still have the indicator box going haywire
> when the total run is 320 feet.
>
> Eric at M2 recommended using RG8X for the reed
> switching pair of leads...keeping the power leads as
> the 2 x 12.  Before I go buy 320 feet of RG8X I wanted
> to hear from any of you on the reflector as to whether
> you think this will cure the gremlins.
>
> Thanks and 73 de Al W5IZ
>
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