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<DIV><EM><FONT color=#800000>PS: Regarding the 3:1 argument I think the extra
antenna efficiency/small size may well be offset (possibly more than offset) by
the propagation advantage of the lower frequency. Laser did not choose
558kHz by accident.</FONT></EM></DIV>
<DIV><FONT size=2 face=Tahoma></FONT> </DIV>
<DIV><FONT size=2 face=Tahoma>Maybe true, but in many cases I suspect it might
be much easier to raise the EMRP to compensate for that, rather
than erect a mast three times as high!</FONT></DIV>
<DIV><FONT size=2 face=Tahoma></FONT> </DIV>
<DIV><FONT size=2 face=Tahoma>Alex</FONT></DIV>
<DIV><FONT size=2 face=Tahoma></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=info@a-bc.co.uk href="mailto:info@a-bc.co.uk">Associated Broadcast
Consultants</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=cma-l@mailman.commedia.org.uk
href="mailto:cma-l@mailman.commedia.org.uk">The Community Media Association
Discussion List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, September 18, 2015 8:54
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [cma-l] AM community
radio</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>Just a thought possibly for a low cost antenna system...
<DIV><BR></DIV>
<DIV>When I was a student many moons ago in Manchester, Radio Rag used to
operate their AM transmitter from the student halls tower block I lived in.
I don't know what you'd call it, but I guess it was an inverted
monopole. 100W transmitter up on the 12th floor feeding into a near
vertical wire radiator down to ground level.</DIV>
<DIV><BR></DIV>
<DIV>Obviously if circularity in coverage is important that might be a problem
(but I don't recall the signal was that strongly impacted behind the
building). But if your local council are obliging it might be a way to
get a reasonably efficient antenna quite cheaply.</DIV>
<DIV><BR></DIV>
<DIV>Glyn</DIV>
<DIV><BR></DIV>
<DIV>PS: Regarding the 3:1 argument I think the extra antenna efficiency/small
size may well be offset (possibly more than offset) by the propagation
advantage of the lower frequency. Laser did not choose 558kHz by
accident.</DIV>
<DIV><BR></DIV>
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