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This was my 3 wire dipole. I have built quite a few and they work pretty good. Rumor has it, that they were first developed by RAF during WWI to directly connect to the 600 ohm feed of their field radios of that vintage. At the time the antenna match was integral to to the frequency of the tank circuit...Or so is my understanding. In any case, the one pictured is cut for 16.2mhz and gives 17-20 meter coverage. At it's natural resonant frequency it represents 450-600ohm load depending on wavelengths in elevation. Making a near perfect 1:1 match to either 450 or 600 ohm feedline, which is then transformed with either a 9 or 12:1 balun for direct 50 ohm feed to a modern radio. For just the same reasons as you would use a 4:1 or 6:1 transformer balun and t.v. twin lead for a standard 300 ohm folded dipole. Like all folded dipoles, they are really only suited for odd harmonics of the fundamental frequency. For more info: http://www.aarontaht.com For a long time I used one cut for Channel 1 of 60 meters (5.33mhz) and it behaved well at almost 17 meters and 11/10 and 6 meters. Ultimately I found it was happiest with a 6:1 balun on account of it's height above ground. Think of it as a T2FD minus the giant resistor.

All that wire was really heavy, so I cut the top two wires and converted it to a simple dipole.

 

As of mid 2011 I obtained my General Class license. My vanity went into effect November 8th, 2011.

I like Sci-fi and old movies. I'm handy with my hands and I keep myself pretty busy. I (should) do lots of yard work in my yard, (but I don't wink) I work-work in a factory & I can sew. Making kites kept me busy for a few years.

I put wings on airplanes. Someday when I retire from the factory, I'll have my own restaurant where I can sell home made brew and innovative burgers and flavorful cuisine. Until that day, I work for "the man," like every other blue collar Joe and enjoy practicing the whole burger thing on the grill on my back deck.

My first radio was a 2 meter HT gifted via N7YAT. It does well for everything I ask of it. Largely it has encouraged my exploration of all things antenna related. As any HT would. The HT has also been used with great success with a variety of antennas. The below pictured, horizontally polarized homebrewed 8 element cubic quad, lots of homebrewed quarter wave whips, slimjims & J-poles; my mobile 5/8 wave antenna and, every other antenna I've ever constructed. I still have it and of any 2 meter antenna, it still is the first thing I use for an "on air" performance check. 

2 meter homebrew quad. Currently in use for local T.V. reception.

Pictured below is a homebrewed 2 meter phasing harness cut for the AM/SSB portion of the band. I used it for quite some time for a 4 element halo array. The experiment was a success, and I learned A LOT, but 6 dB just wasn't enough gain for my taste. I did make it long enough to work a quad yagi EME array, though... So, look out Moon!

Homebrewed 2 meter phasing harness. A 75 ohm transmission line cut at 1/4 wave length of a given frequency will transform a 50 ohm load to 100 ohms. Two 100 ohm loads in parallel will present 50 ohms at the junction. This is duplicated for each pair of antennas, then again for each pair of pairs. All 4 antennas act as a single 50 ohm load. From here, you can adjust the placement of the antennas to further shape your radiation pattern. Currently, I have a stack of 4 horizontally polarized loops, each one on top of the other to assist in a low take off angle for 2 meter DX. (The arrangement makes my normally doughnut shaped radiation pattern is smashed flat.)

I really like the low risk nature afforded by the simplicity and resiliency of handi-talkies.

Antennas go a long way in this hobby. As evidenced by my HT, a decent antenna can make or break any radio or any QSO.  Among my favorite “quick an' easy antennas” is a 300ohm TV twin lead j-pole I pulled from a back issue of QST from 1994, http://www.iw5edi.com/ham-radio/414/an-easy-VHF-uhf-antenna. Or even easier a length of 50 ohm coax with about 19 inches of the center conductor exposed. The HT was happiest with a 16 element collinear I once built for about $30. Read http://www.rason.org/Projects/collant/collant.htm for further details. 

So far, an MFJ-269 is my first and biggest single antenna related investment. It has enabled all of my antenna experiments.

Here is another one:

A Fat dipole made with 6 wires equally spaced around 4 inch PVC drain caps and a W2DU 1:1 Balun. This antenna has a continuous uninterrupted 2:1 SWR curve of 23.9-30MHZ and happily covers all of 2 meters. You read that right. 1 antenna. 10, 11, 12 and 2 meters. It's particularly convienent to just place it on the back fence, then put away when done, or the neighbors come home.

In

Required station pic.

One incarnation of my HF station, (pictured above), consisted of a RS-70M, wired to 220v, powering an IC-718 with DSP and the optional 1.8 SSB filter, an LDG IT-100 auto tuner, a scaf filter from Idiom Press, a West Mountain Radio CLR DSP, a Timewave ANC-4and a Heil Pro-setNow that I'm a General I'm glad to be doing HF work. With a General ticket, radio just grew 10 fold in size. Ultimately, I envision a complete home-brew system, but we'll just have to see about that. There's much I need to master. (scratch this...too much inner-city RFI, & FCC rejection of complaint letters has spoiled HF for me. I guess it all has to be mobile.)

I have since grown quite a bit and my interests have changed to VHF.

In February, 2011, I obtained an Icom IC-2200H and a 5/8 wave mobile from AES by directly driving to their store on Polaris Avenue in Las Vegas. Yes, it was about 1100 miles each way from Seattle, but I was on vacation, and I enjoyed every minute of the trip.

Got a great picture too. Made the rounds at the Icom HQ in Bellevue, Wa. I'm quite proud of that.

Made the rounds at Icom HQ Bellevue, Wa

During the trip I also especially enjoyed a 146.52 simplex in the Mojave. K7QQQ totally cool. He had Bluetoothed a vox enabled hearing aid into a mobile. Forever memorable.

Pre-amp & amps have got my attention, and I'm also curious about building an antenna tuner. VHF allows for construction of some wicked high gain antennas. More so than HF, the world of 2 meter SSB has proven to more interesting, more challenging, and more be rewarding. I'm glad I made the switch. My 2 meter base station consists of an Icom ic-271a with a 300 watt Mirage amplifier and a Cushcraft yagi. I mostly listen, but I am a member of the Pacific Northwest VHF Society and on occasion will take part in the Sunday 144.240 USB morning net. Give a listen, or call CQ, despite popular opinion, SSB is alive and well on VHF, you've just gotta try.

Given the success with the phasing harness with my home station, and various other antennas, I was also inspired to explore Circular Polarization for terrestrial uses. The circular polarization experiment was so wildly successful, I decided to make it a permanent mobile installation. Many areas that were known dead spots have filled in, repeaters that were previously unreachable are now loud and clear, fade, flutter, and multi path, etc... has virtually disappeared. In general, despite the supposed -3 dB gain in signal strength, intelligibility and integrity of signals has increased 5-7dB over a conventional dipole, especially those "on the fringe." Based on empirical evidence, I agree with this paper here: 
benefits of circular polarization. A perfectly clear and readable FM QSO where the s-meter never moves off S0 or S1 is a relatively common occurrence.

Right now, my main "drive time" repeater is 70 miles away...try that with a mobile whip! 20,000+ miles mounted on the car has yielded few surprises, lots of questions, and many, many, many positive signal reports.

On the very first on air test, the first contact was from my back patio, 30 miles to the Arlington airport on a 5 watts handi-talkie. On a clone of this antenna the first contact was 50 miles to the town of Snoqualmie, also on 5 watts. Pretty good for 2 meter simplex, if I do say so myself. It is based on information from http://sv1bsx.50webs.com/antenna-pol/polarization.html​ There are some particulars concerning radiation pattern and construction, email me if you would like to build one. If you hear me while mobile, I will be on the above mentioned ic-2200h and the homebrewed circularly polarized antenna.  (pictured below) On occasion I will also be on D-Star 145.67 simplex. Soon, I will also have APRS up and running.

 
 

 

 

 

 

 

 

 

 

 

 

 

There certainly is a lot to this hobby. The deeper I get the more I look forward to exploring it, and I look forward to talking to you.

 

Bahrain, 1999

7145438 Last modified: 2016-03-07 02:09:13, 12826 bytes

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