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Re: AM tower tuning affected by fog
To: CRTech <crtech@crtech.org>
Subject: Re: AM tower tuning affected by fog
From: John Stortz <ka4flx@gmail.com>
Date: Tue, 16 May 2017 01:27:16 -0400
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I worked with a 2-tower daytimer that went all wacky in rain and whenever there was overnight dew. After years of struggling, we discovered cracked insulators [carbon path in crack becomes conductive when wet] AND the tower sections were not welded together. As the tower aged, there was poor connections between sections of the tower steel. A crew replaced several insulators & tack-welded the tower sections so they became a single conductor. 

The insulators may have cracked from lightning because of poor connections on the tower, which raised the lightning voltage. Welding the tower sections will help protect the insulators from cracking, as well as make a more stable antenna. 

John S.

*Politics is the gentle art of getting votes from the poor and campaign funds from the rich, by promising to protect each from the other.
*~Oscar Ameringer~

On Mon, May 15, 2017 at 4:26 PM, Lou Mueller <loumueller@wedoradio.com> wrote:


I recall looking at your facility on the FCC AM site earlier and noted that your towers are taller than 90 degrees so i would assume you are using sample loops for your DA monitoring. I would suspect a loose connection or a cracked insulator on your tower 3.

Lou Mueller

On May 15, 2017 at 3:51 PM Tom Van Gorkom <tomvangorkom@gmail.com> wrote:

The coils look fine but I did not turn on a bright light and inspect the caps or base insulator...and that reminds me to look at the building insulator as well.. We have geckos running all over inside the doghouses and I have to clean them out every few months but I have never seen a problem from them so far. I don't know how they sneak past the line from the ATU to the tower into the wall and not get burnt.

Tom Van Gorkom
Radio Esperanza Engineering, KRIO AM/FM, KOIR FM
Office: 956-380-8150  
Cell: 865-803-7427

Rio Grande Bible Institute
4300 S US Hwy 281
Edinburg, TX 78539

On Mon, May 15, 2017 at 2:26 PM, Willie Barnett <wbradiolists@gmail.com> wrote:
Wow... that's a weird one! (So's the tower being overloaded by resting birds! Wow!)

POSSIBLY, there may be a capacitor or insulator in the tuning unit that has a crack... and the moisture gets into it, causing the problem. This can also happen to the tower base insulator. (I hope not!!)

There also could be critter nests in places where the moisture wets the nest and de-tunes something. One station I had worked for years ago, had a mouse build a nest INSIDE one of the coils in the tuning unit! Once evicted, the stations parameters returned to normal.


On Mon, May 15, 2017 at 2:50 PM, Tom Van Gorkom <tomvangorkom@gmail.com> wrote:
We have toroid transformers for sampling. The CP did increase by about 1/2 amp along with reflected power by a few watts, but still not a big change. I agree that it can't be much out of tune since tower 4 is usually very affected by tower 3's tuning - closest proximity of the 4 towers. Tower 1 is reference.

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Follow-Ups: Re: AM tower tuning affected by fog
(Tom Van Gorkom <tomvangorkom@gmail.com>, 16 May 2017 21:40:25 -0000)
References: AM tower tuning affected by fog
(Tom Van Gorkom <tomvangorkom@gmail.com>, 15 May 2017 14:26:10 -0000)
Re: AM tower tuning affected by fog
(Lou Mueller <loumueller@wedoradio.com>, 15 May 2017 15:10:33 -0000)
Re: AM tower tuning affected by fog
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 15 May 2017 18:12:26 -0000)
Re: AM tower tuning affected by fog
(Tom Van Gorkom <tomvangorkom@gmail.com>, 15 May 2017 18:51:04 -0000)
Re: AM tower tuning affected by fog
(Willie Barnett <wbradiolists@gmail.com>, 15 May 2017 19:26:55 -0000)
Re: AM tower tuning affected by fog
(Tom Van Gorkom <tomvangorkom@gmail.com>, 15 May 2017 19:51:47 -0000)
Re: AM tower tuning affected by fog
(Lou Mueller <loumueller@wedoradio.com>, 15 May 2017 20:26:42 -0000)
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