Is there such a source on-line or elsewhere ?
TIA !
TIA !
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Past Daytime Coverage Maps of Now-dark AM stations ?
- Thread starter Steve Green NEPA
- Start date
I wish that I could find information on old directional antenna arrays and coverage maps. There are a few fccinfo.com, but quite recent ones. Art Vuolo used to have a three ring binder full of a few dozen. I asked him about it but I didn't get an answer.
I have a large-format, coil-bound book of AM station coverage maps published and updated in the 1950s/1960s by the Mutual Broadcasting System. Its pages are too large for me to scan (2' x 3'), but below is a quick jpg of a page from it taken with my cellphone.
If anyone would like to see other frequencies (and I don't get flooded with requests for them), I'll post better composed/lit/focused pics of them here.
Any chance I could borrow and scan the book and return it to you for the www.americanradiohistory.com website? I'd pay the shipping, of course.
WBCK 930 must have added the fourth tower when they went to 5 kW Daytime, to protect WEOL better and serve Kalamazoo better. WOKY 920 overlap would be over Lake Michigan. WKBM 930 Sandwich, IL was sandwiched in much later.
BTW, these maps by frequency show the patterns, not the actual groundwave contours. I liked the Kear and Kennedy individual ones that showed the 0.5 mV/m and 0.1 mV/m contours. It made it look like the stations all served a huge area. When the stations signed on with those facilities, there was a de facto service area beyond the 0.5 mV/m.
BTW, these maps by frequency show the patterns, not the actual groundwave contours. I liked the Kear and Kennedy individual ones that showed the 0.5 mV/m and 0.1 mV/m contours. It made it look like the stations all served a huge area. When the stations signed on with those facilities, there was a de facto service area beyond the 0.5 mV/m.
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Considering a couple of things w.r.t. that,
a) the book is in kind of fragile shape
b) it has quite a few "paste-on" pattern updates that have come loose, or never were pasted on
c) not sure about the legality of making/publishing an electronic copy of the complete book.
If it was legal to do so, maybe I could get it electronically copied by a local source — which should avoid its possible rough handling and/or even its loss in transit.
Below is a set of present-day, nighttime, 50% skywave, 0.15 mV/m contours for 930 kHz.
It is no wonder why NIF coverage areas for 930 kHz are not very large.
It's out of copyright. That series was the predecessor of the Cleveland Institute map books, and those are no longer covered either. I lost mine, unfortunately, in one of my relocations.
In any case, my website would be responsible for any rights issue.
www.americanradiohistory.com
Not a dark station, certainly, but I like this old coverage map of 77 WABC.
It's pretty accurate as far as a fairly good listenable signal is concerned.
https://www.musicradio77.com/map.html
It's pretty accurate as far as a fairly good listenable signal is concerned.
https://www.musicradio77.com/map.html
Great web site. Have been visiting it quite a bit in the past.
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