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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 11:55:55 -0500
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Interesting. That could happen here. I decided that I would go to the site the next time it happens so I could see everything while in failure.

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 11:52 AM, Rick Jesse <javajava56@gmail.com> wrote:
Check this site:


Top story...


On Mon, May 15, 2017 at 10:52 AM, Tom Van Gorkom <tomvangorkom@gmail.com> wrote:
It becomes unstable - that is, the -179 deg bounces all over the place and of course, being on the line between -179 and +179 makes it look really bad. The logs record +101, 81 deg, then -179, then +179 deg , and the power ratio of 46.5% went down to 30% but bounced around too.

What's strange is that I don't know exactly when the fog formed but probably 4-5 AM, it affected the tower at 6 AM - perhaps when thickest, and by 6:20ish it returned to normal. At 6:45 we switch to day pattern which does not use tower 3 and all is normal.

I don't have solder connections except for grounding copper strips. All else are screw terminals. I will likely shut it all off so I can check all of it. I spray cleaned and checked what I could without danger.


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 10:29 AM, Rick Jesse <javajava56@gmail.com> wrote:
Yep.  I'm with Lou.  Check your connections and especially soldered joints.


On Mon, May 15, 2017 at 10:10 AM, Lou Mueller <loumueller@wedoradio.com> wrote:

Tom,

When you notice this are you out of compliance (5% ratio / 3 degrees phase)? Do the parameters come back to normal after the fog lifts? 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. 

Lou Mueller - Louis Mueller Broadcast Service

Altamonte Springs, FL

On May 15, 2017 at 10:25 AM Tom Van Gorkom <tomvangorkom@gmail.com> wrote:

Any AM guys out there? We have an AM 4 tower directional array. For the first time in my 4 years here, two foggy mornings in a row affected adversely tower 3, the negative tower in the night pattern, but strangely, it had no affect on the tuning parameters of the others that I would normally see if it was really out of tune.

I cleaned up all vegetation around the towers just in case, checked and cleaned the relays, checked other connections but could not see anything obvious. It's running perfect otherwise and I am not sure how to reproduce the problem.

Any ideas?

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
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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
(Rick Jesse <javajava56@gmail.com>, 15 May 2017 15:30:05 -0000)
Re: AM tower tuning affected by fog
(Tom Van Gorkom <tomvangorkom@gmail.com>, 15 May 2017 15:52:28 -0000)
Re: AM tower tuning affected by fog
(Rick Jesse <javajava56@gmail.com>, 15 May 2017 16:53:02 -0000)
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