[UK-CONTEST] More Hardline info

[Adrian Rees (MW1LCR)]

I am going open wire feeder on all my HF aerials. The following link is
to a classic book about Radio Antenna Engineering, from Edmund Laport,
one time chief engineer for RCA, at the height of SW broadcasting. The
book is well worth a read, even if you don't bother with open wire
feeders the photographs are very interesting.

The chapters about open wire feeders, including the practical
installation of QRO (50Kw +) feeders are very good.


http://snulbug.mtview.ca.us/books/RadioAntennaEngineering/


Regards

Adrian MW1LCR

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of
gm4fam at tiscali.co.uk
Sent: 09 January 2009 18:37
To: uk-contest at contesting.com
Subject: [UK-CONTEST] More Hardline info


Just as a quick illustration of power losses using 100 metre lengths of 
various feeders:-

100 watts of RF on 1.8 MHz would yield:-

82.1 watts (0.86 dB loss) using Belden 8267 (RG-213)
86.5 watts (0.63 dB loss) using Wireman CQ-110 (RG-213)
93.6 watts (0.29 dB loss) using LDF 4-50, and
97.6 watts (0.11 dB loss) using LDF 6-50

These are for TopBand; at 28 MHz and above the figures are much more 
depressing for co-ax!

The attached link gives many options so as to ascertain losses for 
various feeders and at various frequencies:-

http://www.ocarc.ca/coax.htm


73 Cris 
GM4FAM




50% off Norton Security 2009 - http://www.tiscali.co.uk/security 

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