You might try a magnetic loop. Here is a Wikipedia article with references to others: http://en.wikipedia.org/wiki/Magnetic_loop
73, Matt W6NIA On Tue, 14 Dec 2010 23:41:47 +0800 (HKT), you wrote: >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 > > > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:Elecraft@mailman.qth.net > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
