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Title: Amateur MF Allocation Moves a Step Closer Post by: Pete, WA2CWA on February 24, 2011, 02:03:37 PM Time to start thinking about those really long antenna arrays and high verticals.
From the ARRL web site dated 2/24/11: http://www.arrl.org/news/amateur-mf-allocation-moves-a-step-closer (http://www.photolib.noaa.gov/bigs/theb2298.jpg) (http://www.astel-comms.com/images/tee_antenna.gif) Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 24, 2011, 02:13:31 PM Will my G5RV work?
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 24, 2011, 02:37:07 PM Will my G5RV work? 1/4w is something like 507' long... and mobile experience tells me that the lower in frequency, the more critical the tuning is on an antenna, and the higher the Q gets, because physical limitations will keep it so relatively close to the ground... unless it's a loop antenna. Homebrewed tuner (with extra amounts of Fixed-L added in series - Air-dux, anyone?) and some W-I-D-E spaced capacitors, feeding open-wire line to a loop that's >1000' in overall length.That band should quickly become know as "Ranchers Frequencies", because only Ranches will have enough real-estate to erect any kind of half-way decent antenna! Title: Re: Amateur MF Allocation Moves a Step Closer Post by: KB2WIG on February 24, 2011, 02:55:50 PM G,
Dont worry 'boute that... MFJ will make a tuna for Steves g5rv. klc Title: Re: Amateur MF Allocation Moves a Step Closer Post by: WB2EMS on February 24, 2011, 03:22:38 PM Might become a popular band if it's below the lowest frequency threshold of BPL emissions. :o
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 24, 2011, 03:38:57 PM G, Dont worry 'boute that... MFJ will make a tuna for Steves g5rv. I can't believe the HUZman has a dummy-lo...er, G5RV (off-center fed coat hanger) for an antenna... Title: Re: Amateur MF Allocation Moves a Step Closer Post by: KA0HCP on February 24, 2011, 04:43:41 PM Well Alright! I've been making sketches for a Flat Top Tee antenna and eyeballing which trees to hang it from.
A fellow could sneeze and be off frequency with only 15kc's, but it is a start. General aviation is rapidly changing over to glass cockpits with satellite weather, notams, synthetic 3d map displays and approach guidance. The FAA started abandoning Non Directional Beacons over ten years ago, which should open more and more space between 200 and 500kc for amateur radio to request in the future. Bill Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 24, 2011, 05:20:35 PM Several AMers have been using the 500 kHz experimental allocation for several years. Jay - W1VD is but one.
http://www.w1vd.com/ Here's Jay's transmit antenna. No ranch required. http://www.w1vd.com/XNStxantenna.html Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 24, 2011, 06:57:06 PM Several AMers have been using the 500 kHz experimental allocation for several years. Jay - W1VD is but one. Here's Jay's transmit antenna. No ranch required. Uhm... no way you can get a pair of 95' towers in a 60x120' residential lot... Title: Re: Amateur MF Allocation Moves a Step Closer Post by: KF1Z on February 24, 2011, 07:30:08 PM I even know of a company making mono/dual band SDR transcievers for 500khz ( and 137khz ).
I think they'll be around $200. Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 24, 2011, 09:53:20 PM You said ranch homey!
Several AMers have been using the 500 kHz experimental allocation for several years. Jay - W1VD is but one. Here's Jay's transmit antenna. No ranch required. Uhm... no way you can get a pair of 95' towers in a 60x120' residential lot... Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 25, 2011, 10:23:46 AM You said ranch homey! Yeah, I did. Define "Ranch" ;-) I see a Ranch as 5+ acres. 50x100, or 60x120, or even a 100x200 lot won't support an antenna for 461kHz! :o 20 100' zig-zag runs, back and forth in a wwwwwwwwwww type of configuration? ;-) Ranch, bro... you gots ta have acreage! Like Don, or Timtron... (hey, I seen Pictures!) ;-) Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 25, 2011, 12:17:08 PM You're from Texas and you call five acres a ranch? They're gonna take away your citizenship! ;D
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 25, 2011, 12:40:36 PM You're from Texas and you call five acres a ranch? They're gonna take away your citizenship! ;D It's more of a 'spread' than any place I've ever lived! ;-) Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 25, 2011, 01:45:57 PM Me too. Keep the dream alive. :D
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 25, 2011, 03:21:30 PM Anyone on 15m? I'm on 21.245, now!
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: w5omr on February 25, 2011, 03:22:49 PM 21.425, that is...
Title: Re: Amateur MF Allocation Moves a Step Closer Post by: Steve - K4HX on February 25, 2011, 03:38:04 PM http://amfone.net/Amforum/index.php?topic=26902.0 AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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