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KZDC downgrading day signal

willdav713 said:
So in a way, the tower for KZDC AM failed like KJOJ 103.3 did out of Freeport but not because of a hurricane.
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Huh?!? The KJOJ-FM tower collapsed due to whipsaw winds from a severe thunderstorm, not a hurricane.

KZDC is reporting a failure of the transmitter itself combined with a sale of the tower site land. Two entirely different scenarios.
secondchoice said:
Why are they reducing the power daytime from the night site? It looks like they are protecting XESC at night with 920 watts. In theory there is no skywave during daytime hours.
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They likely can’t replicate the day pattern at the night site, or don’t want to go to the expense of doing so. and there are likely issues with first adjacent stations as explained in post #5 of this thread.

Besides, dropping to 290 watts during the day saves on the power bill.
 
ted chittenden said:
And I didn't realize (gulp) that only one tower was used for the nighttime arrangement. Given that information:

1) There are no same frequency stations KZDC has to protect until you get to Seminole (going north/northwest); Paris (going northeast); or Port Arthur (going southeast), and all of those are pretty far away.
2) On the other hand, when one looks at adjacent frequencies, one finds stations at 1260 kHz licensed to Falfurrias, San Angelo, and Taylor (an Austin suburb). The Taylor station especially would really limit how much power one could legally use with a non-directional antenna on 1250 kHz.

Thanks for the heads up.
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If they ran the nighttime pattern daytime they don't even reach Austin on paper. 1260 is on the other side of Austin. The current 25KW daytime pattern on paper is in the southwest part of Austin and the 1250 Night pattern should reduce the adjunct channel interference between Austin and S.A helping Taylor. The current 1250 25kw KZDC is closer to San Angelo than the night pattern on paper. The current 1250 daytime pattern has a lobe headed south towards Falfurrias.

IMHO you are correct about the one tower operation. But using the old non scientific "4 times the power doubles the coverage in AM" not counting the directional pattern difference 25,000 divided by 4 equals 6250 divided by 4 equals 1562.. so there could be at least a 75% reduction in daytime coverage.
 


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