Hi Paul,
Thanks very much; I understand it now. It has all to do with the rules and
nothing to do with actual RF transmission and antennas. So that example that
was cited was getting more coverage than it was licensed for, apparently,
since it used a taller tower without reducing its power. I wonder how much
improvement it made.
Steve
----- Original Message -----
From: "Paul B. Walker, Jr." <[EMAIL PROTECTED]>
To: "Mailing list for the International Radio Club of America"
<irca@hard-core-dx.com>
Sent: Thursday, October 30, 2008 10:33 AM
Subject: Re: [IRCA] QSL request
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
<[EMAIL PROTECTED]>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." <
[EMAIL PROTECTED]>
To: "Mailing list for the International Radio Club of America" <
irca@hard-core-dx.com>
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 <[EMAIL PROTECTED]
>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
[EMAIL PROTECTED]
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