Was just thinking how large the coverage area of a 50 KW AM station low on the band and located in the upper great plains would be. WNAX-570 in Yankton, SD runs only 5 KW, but has one of the larger coverage areas of any AM station in the country. Just something that someone who used to be in the business and still has an interest in it thinks about from time to time.
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How far would it go??
- Thread starter wpiv926
- Start date
I'd never looked at this one before...CBK 540 at Watrous, Saskatchewan. I figured with 50 kW it had to be big, but it won't fit on the Radio-Locator map...
http://radio-locator.com/cgi-bin/pat?call=CBK&service=AM&status=F&hours=U
http://radio-locator.com/cgi-bin/pat?call=CBK&service=AM&status=F&hours=U
Here is a link to a short paper comparing the groundwave fields of non-directional stations using 1/2-wave vertical antennas with 1, 5, 10 and 50 kW transmitters, for three ground conductivities and frequencies from 600 kHz through 1600 kHz.
Many AM stations use shorter antennas (around 1/4-wave), which produce slightly lower fields -- but this paper compares them all on an equal basis to show how frequency and conductivity affects field intensity, for a given transmitter power.
http://www.radioworld.com/article/am-coverage-frequency-vs-conductivity/23739
Many AM stations use shorter antennas (around 1/4-wave), which produce slightly lower fields -- but this paper compares them all on an equal basis to show how frequency and conductivity affects field intensity, for a given transmitter power.
http://www.radioworld.com/article/am-coverage-frequency-vs-conductivity/23739
K
kenglish
Guest
I usually try to listen to Radio Australia programming on CBK during my early morning commutes in Salt Lake City. Sometimes it's great. sometimes all I get is a Mexican channel.
With KIHU's mighty 194 night-time watts on 1010 in "Tooele" (SLC) I guess CBR's not much of an option.
CBK takes the cake...no problem hearing them at Mt Rushmore during the day. How far east has anyone heard them at night? I have yet to log them in Indiana.
CBK is only using just over a 1/4 wave-length tower. "95.80" electrical height.
BobOnTheJob said:
In SE Iowa, they used to be reliable enough in the mid 70s that I'd listen to a Saturday night program, "Al Bonner's Hall of Fame" every week. Or I'd try to...some weeks CBK would have some pretty deep fades, other weeks quite good.
Today, KWMT in Fort Dodge IA on 540 runs about 170 watts at night, so CBK might still be ID-ed, but it's in the background.
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