Hi all, Just in case it might be of use/interest i have loaded an Excel
spreadsheet onto my web site which does a calculation of the ERP of a
Marconi and loop aerial, of the same dimensions. This may be useful for
determining what aerial current you must restrict to if you are to stay
within the 100mW ERP restriction.

Exterience on 136khz has shown that the measured ERPs from typical amateur
locations are about 6dB below the value calculated . This is probably due to
the high angle radiation of short aerials and the absorption of foliage and
surrounding buildings.

The sheet is not yet indexed on my "download" page but may be accessed
directly with

www.alan.melia.btinternet.co.uk/download/ERP1.xls

Please allow for finger trouble at this end and advise if there are any
problems of access or operation.

Cheers de Alan G3NYK