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Re: [TowerTalk] RMC-1000 remote - what type of cable to run?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] RMC-1000 remote - what type of cable to run?
From: Howard W6HDG <W6HDG@arrl.net>
Date: Thu, 06 Nov 2014 10:45:33 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Ray,
I just joined the list today so hope I am responding properly. Thanks for the pics. Are your MARB and MAF parts from 40 years ago as well? They look brand new. Very nice job on your base.

I'm in Poway north of San Diego. It has been less than 2 months since our new antenna ordinance has gone into effect - see page 81 in Nov QST. This will be my very first tower.

I have power nearby. I'll attach a pic of my base and see if it gets to the group. This was from last week before the forms got removed. US Tower wants the steel template to stay put for 24 hours after the pour, so you can see the elevated frame which allowed the concrete to be troweled smooth underneath.

Two questions for you - are you going to put non-shrink grout under the base as US Tower suggests? And how do you keep the exposed base threads from rusting? Mine are already starting.

Howard W6HDG


At 10:19 AM 11/6/2014, you wrote:
Howard,

For that short of a run, I would use rotator cable would work. Is the AC going to be at the base of the tower. For mine, the AC is at the base of the MA770.

My MA770 came from an SK in the Hollywood Hills.

Where are you in So Cal? I grew up in SD, and in the 70's moved to Ventura and the Ojai Valley. Retired in 2009 and moved to Chino Valley, 15 miles north of Prescott, AZ. Beautiful county and a very nice place to live. Â

Attached are 4 photos of my installation here in AZ. I'll have to dig deeper to find the photos of when I brought the tower to my CA home showing the limit switches.

Ray,
N6VR



On Thu, Nov 6, 2014 at 11:02 AM, Howard W6HDG <<mailto:W6HDG@arrl.net>W6HDG@arrl.net> wrote:
Ray,
Thanks very much.   I guess that rotor cable would be too lightweight?

I know that this tower design has been around a long time - I didn't realize 40 years. The winds are mostly gentle in my area of S. California so I'm hoping for 65 feet extension without too much sway. I'm putting a Steppir DB18 (96 pounds) on it.  I will be able to supervise my tower traveling up and down outside my shack window. The shack is just 20 feet from the base. 73, Howard W6HDG

At 09:48 AM 11/6/2014, you wrote:
Howard,

The cable should be 8 conductors, and depending on cable run, 14ga or 16ga. There is no large current traveling in the conductors, mainly control signals.

I have a 40 year old MA770 in the air, but would think the mounting of the limit switches and type are different. I took off the limit switches on mine, and because of winds, only raise the tower about 2/3 height.

I do have photos of the originally mounted limit switches but may take me awhile to find them.Ã?

Send me a personal email and I can send you some photos when I find them.

73,

Ray,
N6VR

PS, there was another ham on this reflector who was selling his MA770 about 2 - 3 months ago. You may want to search the archives for him. His call may be N2JFS???

On Thu, Nov 6, 2014 at 10:25 AM, Howard W6HDG <<mailto:W6HDG@arrl.net>W6HDG@arrl.net> wrote: I've got a US Tower MA-770MDP on order with the RMC-1000 remote.� I want to prewire my shack before the tower arrives.� Does anyone know the specifics of the required cable - how many conductors and sizes?� I don't imagine that US Tower will be providing this cable, will it?� Tnx� Howard W6HDG

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