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<DIV><FONT size=2>Appreciated, though there must be some comfort in the fact
that the design has been 'standard issue' for a century, and is used by many of
the most powerful AM transmitters such as Drotiwich. <FONT size=2>You might also
find BS1386 of some interest.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV>The most critical aspects seem to be as you'd expect getting a good earth
place below the capacity hat, and getting a high quality tuning coil with very
low resistance and able to handle the relatively high voltages involved
(but for a transmitter of a 100W or so that's not so tough). </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The client needs 'expectations management', I guess. If
you find the theoretical antenna design would in all
likliehood cut the client's electricity bill to a quarter, he
might be willing to accept a little uncertainty in the exact radiation
performance! If you could take the antenna efficiency up from 8% to say 30-40%,
there's a very big saving in runnings costs to be had.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Alex</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=transplanfm@hotmail.com href="mailto:transplanfm@hotmail.com">Ian
Hickling</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> Sunday, December 20, 2015 1:24
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [cma-l] AM v FM</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>I appreciate all the advice and input - thank you.<BR>I have the
huge advantage of having worked in an engineering laboratory that built VHF
and UHF antennas and range-tested them so I am very fortunate to have an
inbuilt comprehension of how they look and perform.<BR>Nowhere in all that
worthy information is there evidence of energy propagation patterns - actually
measured in the field as opposed to calculated or computer modelled.<BR>Most
important - the difference between success and failure.<BR>I can't guarantee
to a Client how well an AM (MF) antenna will perform as I can with FM (VHF) -
and that worries me.<BR><BR>
<DIV>
<DIV
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size=3><B>Ian Hickling</B><BR></FONT></DIV><FONT
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