Steve,
I will try an answer your question from a broadcasters point of view. I
have
a general understanding of RF and FCC stuff.
When you see a station's licensed power listed, it is almost always for a
1/4 wave tower. When I was at WQMA 1520, our tower was 150 feet which is
1/4
wave for 1520 Khz. If the tower is taller then 1/4 wave, it is therefore
more efficent then it needs to be.
If a tower is more efficent (taller then required) then you don't need
quite
as much power to make the same coverage area that a slightly shorter tower
would produce.
Most stations elect for 1/4 wave towers, much much cheaper to build.
Paul Walker
www.onairdj.com
P.S. I think Powell would even agree I explained this one well.
On Thu, Oct 30, 2008 at 12:23 PM, Steve Ratzlaff
<steveratz@xxxxxxxxxxxx>wrote:
As an AM TX and general domestic AM dummy, what does all this mean, about
not being able to put a 1kW signal into some type of tower? What does the
power and or tower have to do with not being able to feed full power into
the antenna?
Steve
----- Original Message ----- From: "Paul B. Walker, Jr." <
walkerbroadcasting@xxxxxxxxx>
To: "Mailing list for the International Radio Club of America" <
irca@xxxxxxxxxxxxxxxx>
Sent: Thursday, October 30, 2008 9:44 AM
Subject: Re: [IRCA] QSL request
There was an AM not far from me at WABV, that was on a Class C Channel
and
supposedly had a 5/8 wave tower.. and put the full 1KW into the tower.
Glad we could try and help!
Paul Walker
www.onairdj.com
On Thu, Oct 30, 2008 at 6:36 AM, Craig Healy <bubba@xxxxxxxxxxxxxxxxxxxx
>wrote:
The station that received the QSL is WNBH-1340 in New Bedford, MA. The
report came from Finland. There have been a few reports from
Scandinavia
in
the past few years.
WNBH is a bit of an anomoly in that it has a tall tower, yet puts the
full
kilowatt into in. No power cutback to make it an equivalent
kilowatt/quarter wave tower. On vacation on Monhegan Island off the
coast
of Maine I could hear WNBH if I nulled the other pests. It does get
out
well.
Thanks to all for the ear work!
Craig Healy
Providence, RI
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--
Sincerely,
Paul B. Walker, Jr.
www.onairdj.com
walkerbroadcasting@xxxxxxxxx
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