Hello Group,
This is off topic but I know there are experts in this group.
I am the amateur radio sector representative of Radio Spectrum Advisory
Committee (RSAC) of Telecommunication Authority of Hong Kong. RSAC is an
official advisory committee under the Hong Kong Government.
http://www.ofta.gov.hk/en/ad-comm/rsac/main.html
The Asia Pacific Telecommunity is now having its meetings in Hong Kong.
http://www.aptsec.org/
One of the discussion is related to WRC 2012 Agenda item 1.23 about the
allocation of a 15Khz segment within 415-526.5Khz for amateur services.
As a representative of RSAC, I am now attending the discussion group for the
Agenda item 1.23.
Propagation in this band is primarily by means of ground wave,so availability
of
this band for the amateur service may provide a useful extension of the
capability of the amateur service to provide disaster notification and relief
communications on a wider area basis than is normally provided by the VHF or
UHF
bands that form the main-stay of amateur disaster relief communications.
My questions are :
1. practically speaking, apart from huge traditional wire antenna, are there
any other antennas of managable size (also reasonable efficiency) which can be
easily set up under distress situation?
2. to make communciations of say within 200-300km, what ERP is required?
3. for a segment of 15Khz, voice communciation seems quite restrictive. How
efficent will it be under digital mode (not CW) such as Pactor?
I must admit that I am not a radio man by profession and have limited knowledge
on MF radio operation. I am looking forward to your advice and apologise for
the band width in this mail reflector.
73
Johnny VR2XMC
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