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Strange Antenna challenge Memorial Day - need suggestions
I'm looking for suggestions for the Strange Antenna Challenge this
Memorial Day week-end. One guy used a pair of back-to-back trucks to make a dipole, and one guy loaded up a sports stadium. A group in Atlanta used an Extension Ladder on 20M and that worked well, but that seems a little less strange than I'd like. It almost looks like a regular antenna when it's standing straight up. I want something that doesn't look like an antenna (one guy suggested hoisting a BBQ grill into the trees, but I'm sure that wouldn't work well on 20M). I want something that can be adjusted to be somewhat near resonance without a tuner. Ideas? Eric |
Strange Antenna challenge Memorial Day - need suggestions
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Strange Antenna challenge Memorial Day - need suggestions
On Thu, 20 Mar 2008 10:34:22 -0700 (PDT), Eric
wrote: I want something that doesn't look like an antenna (one guy suggested hoisting a BBQ grill into the trees, but I'm sure that wouldn't work well on 20M). The grill no, but the tree, probably (why skip the obvious in both strange AND doable?). I want something that can be adjusted to be somewhat near resonance without a tuner. Then it wouldn't be strange - would it? 73's Richard Clark, KB7QHC |
Strange Antenna challenge Memorial Day - need suggestions
On 20-Mar-2008, Buck wrote: Path: border1.nntp.dca.giganews.com!border2.nntp.dca.gig anews.com!nntp.giganews.com!bigfeed3.bellsouth.net !bigfeed.bellsouth.net!bignumber.bellsouth.net!new s.bellsouth.net!bignews7.bellsouth.net.POSTED!b6d4 19e3!not-for-mail From: Buck Newsgroups: rec.radio.amateur.antenna Subject: Stealth Loop antenna Message-ID: X-Newsreader: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 48 X-Complaints-To: X-Abuse-Info: Please forward a copy of all headers for proper handling X-Trace: enggpaojkliedbjjdbdpiflmbcekedmfhojhikkbagflhcbopd pcindpodohfflilmehcadebpjbmnbeonldlemekfihcohpppai mpifmkcegckdogcmapfnfkkinfaikccgicoleplfnlbfebeelh cnmdabofba NNTP-Posting-Date: Thu, 20 Mar 2008 09:30:13 EDT Organization: BellSouth Internet Group Date: Thu, 20 Mar 2008 09:30:34 -0400 Bytes: 2671 X-Original-Bytes: 2628 Xref: number1.nntp.dca.giganews.com rec.radio.amateur.antenna:295507 This is an interesting antenna. It is a mobile stealth magnetic loop antenna. http://stealth.ae/plugins/custompage...categories=136 I watched the video and checked out the details. The antenna is basically a loop with the roof of the car (the bottom of the luggage rack) as the ground side of the loop, the antenna goes up, folds over the top and back down to the other side of the roof where it feeds thru a high voltage vacuum variable capacitor back to ground. --------------------------- | | |_ | | |( coax conx) = Capacitor | -|_____________| ^ (roof) ^ (feed) I am not as good an artist as some of you, but here is my graphic The coax feeds with a gamma? and is tuned by a stepper motor tuning the vacuum variable cap. Depending on which of the three models, it operates from 1.5-10 MHz, 2.7-15.5 MHz, or 4.5-22 MHz at up to 150 watts. The technical notes have more interesting details: http://stealth.ae/plugins/custompage...cles.php?id=10 It seems to me a homebrew version could be made for base use such as for those in restricted homes. Placed on the peak of the house, the ground side could be a wire across the top of the peak and the loop lift up during use so it would not attract too much attention to the neighbors. I wonder what the size and cost of the Vacuum variable is to make a similar antenna?? Buck N4PGW -- 73 for now Buck, N4PGW www.lumpuckeroo.com "Small - broadband - efficient: pick any two." My antenna at NB6GC is an Aircraft Carrier. Ken Fowler, KO6NO |
Strange Antenna challenge Memorial Day - need suggestions
On Mar 20, 7:38 pm, "Ken Fowler" wrote:
My antenna at NB6GC is an Aircraft Carrier. That sounds interesting but I don't think there are many of them in Atlanta! Are you in the Navy? Do you have a link for some pictures? Eric |
Strange Antenna challenge Memorial Day - need suggestions
In message
, Eric writes I'm looking for suggestions for the Strange Antenna Challenge this Memorial Day week-end. One guy used a pair of back-to-back trucks to make a dipole, and one guy loaded up a sports stadium. A group in Atlanta used an Extension Ladder on 20M and that worked well, but that seems a little less strange than I'd like. It almost looks like a regular antenna when it's standing straight up. I want something that doesn't look like an antenna (one guy suggested hoisting a BBQ grill into the trees, but I'm sure that wouldn't work well on 20M). I want something that can be adjusted to be somewhat near resonance without a tuner. I've always wondered how well this would get out loaded up on Top Band http://www.firstcity.force9.co.uk/newgallery/out1.htm 73 Brian GM4DIJ -- Brian Howie |
Strange Antenna challenge Memorial Day - need suggestions
On Mar 21, 2:50 pm, Brian Howie wrote:
I've always wondered how well this would get out loaded up on Top Band http://www.firstcity.force9.co.uk/newgallery/out1.htm I'm afraid the homeland security people would want to talk to you about that! They tend to get excitied about wires and electronic equipment near bridges. But it certainly does have an impressive array of vertical radiators. It would be quite directional, so hopefully there are some good DX stations off the ends of this. Eric |
Strange Antenna challenge Memorial Day - need suggestions
On Mar 20, 1:34*pm, Eric wrote:
I'm looking for suggestions for the Strange Antenna Challenge this Memorial Day week-end. One guy used a pair of back-to-back trucks to make a dipole, and one guy loaded up a sports stadium. A group in Atlanta used an Extension Ladder on 20M and that worked well, but that seems a little less strange than I'd like. It almost looks like a regular antenna when it's standing straight up. I want something that doesn't look like an antenna (one guy suggested hoisting a BBQ grill into the trees, but I'm sure that wouldn't work well on 20M). I want something that can be adjusted to be somewhat near resonance without a tuner. Ideas? Eric Things automotive seem to be favored. How about an exhaust system for a radiator and a coil spring for a loading coil. Jimmie |
Strange Antenna challenge Memorial Day - need suggestions
On Mar 25, 10:57*am, JIMMIE wrote:
On Mar 20, 1:34*pm, Eric wrote: I'm looking for suggestions for the Strange Antenna Challenge this Memorial Day week-end. One guy used a pair of back-to-back trucks to make a dipole, and one guy loaded up a sports stadium. A group in Atlanta used an Extension Ladder on 20M and that worked well, but that seems a little less strange than I'd like. It almost looks like a regular antenna when it's standing straight up. I want something that doesn't look like an antenna (one guy suggested hoisting a BBQ grill into the trees, but I'm sure that wouldn't work well on 20M). I want something that can be adjusted to be somewhat near resonance without a tuner. Ideas? Eric Things automotive seem to be favored. How about an exhaust system for a radiator and a coil spring for a loading coil. Jimmie Then we could sit on the car to tune it! We may have to call a bunch of friends over, or else we could chow down on the hamburgers and potatoe salad! Eric |
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