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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: Tom Van Gorkom <tomvangorkom@gmail.com>
Date: Mon, 15 May 2017 13:50:58 -0500
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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.

The only other thing I have changed recently on that tower is one of the 12 lower guy insulators - 24 inch fiberglass rods. That should not cause this unless somehow the new one with it's smooth finish conducts more when wet, but I can't imagine they could affect it much since they have the same rod insulators at the top as well and the guys are broken up all the way down. Just trying to think of what has changed.

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 1:12 PM, Kevin Kidd <kkbroadcastengineering@gmail.com> wrote:
Exactly what he said...  Do the other towers stay right on normal?  

If it is a feed problem, almost 100% of the time, the other tower/system readings will change by some amount (or even knock the TX off due to VSWR).  This includes the common point current, TX VSWR, etc.

If the affected tower isn't the Reference tower AND only one tower's readings is changing while every other parameter stays normal, it is almost certainly a sample problem.  IE, Twr1, Twr2, Twr4, CP, TX VSWR, TX PO readings all remain within normal constraints, it is typically a sample problem.

And sometimes not...

Do you have sample loops or toroids?

Absolutely don't crank anything until you know what is causing the original problem.


On Mon, May 15, 2017 at 10:10 AM, Lou Mueller <loumueller@wedoradio.com> wrote:
Is only tower 3 affected?  My experience has been is the operating parameters are actually changing on one tower i has an effect on the other towers' parameters too. May have an issue with your sample system. 

Kevin C. Kidd, CSRE/AMD
Lawrenceburg, TN
AM Ground Systems Company  -  WD4RAT
kkidd@kkbc.com  --  866-22-RADIO -- 866-227-2346

Follow-Ups: Re: AM tower tuning affected by fog
(Willie Barnett <wbradiolists@gmail.com>, 15 May 2017 19:26:55 -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)
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