Martin's Site
  • Home
  • Ham Radio - K0BXB
    • Operating Modes >
      • D-STAR
      • Ultra Portable PSK/Digital
    • Antennas >
      • Portable Antennas >
        • Vertical Antennas >
          • Silver Bullet 1000 TIA
          • Pac 12 Portable Vertical Antenna
          • Spiral Wound Vertical
          • Portable 17 ft. wire vertical
        • Other Portable Antenna Options
        • Magnet Loop
      • Dipoles/Inverted VEEs >
        • 40/20 Trap-Fan Inverted Vee Comparison
        • Link Inverted Vee
        • Trap Antennas >
          • 40/20 Meter Trap-Inverted Vee
          • 17/20/30/40 Trap Inverted Vee
        • 40/20 Fan-Inverted Vee
        • 40 Meter Inverted Vee
      • Base Station and General Antennas >
        • G5RV Jr of Speaker Wire
        • End Fed Antennas >
          • End Fed Half Wave Antenna
          • 35 foot end fed wire
          • 51 Foot End Fed Wire
          • 84 Foot End Fed Multi-band Antenna
        • Baluns, Ununs, Etc.
        • Tuner/Matchbox >
          • Tuna Tunah II
          • EMTECH ZM-2 ATU
      • Portable Masts
      • Antenna Test Gear >
        • X5105 Antenna Analyzer
        • Field Strength Meter
    • QRP Thoughts & Experiences
    • Radios >
      • Portable Rigs >
        • X5105
        • Ten-Tec R4020 QRP Transceiver
    • Ham Radio Field Days >
      • 2018 Field Day
      • 2016 Field Day
      • 2015 Field Day
    • Portable HF.... >
      • Portable Operating
    • Going Mobile HF & VHF >
      • Re-installing the Mobile
    • Miscellaneous Ham Radio Topics >
      • Keeping wires and ropes untangled
      • Helping Others
  • Backpacking/Camping
    • 2019 Backpacking/Camping Season
    • 2018 Backpacking/Camping Season >
      • Oct 2018 Boundary waters
      • August 4-5, 2018 Wisconsin River Canoe Trip
      • July 16-18 Devil's Lake Birthday Campout
      • June 28-30, 2018 Backpacking/Camping
      • June 2018 ARRL Field Day Camput
      • April 2017 Ice Age National Scenic Trail
    • 2017 Backpacking/Camping Season >
      • July 2017 Camping at Timber-Lee Christian Campground
      • Cancelled Ice Age Trail Backpacking Trip
      • June 2017 Hiking/Backpacking/Camping >
        • Cave of the Mounds and Blue Mounds State Park
      • May 2017 Backpacking/Hiking/Camping >
        • May 19 Ottawa Lakes Campground
        • May 4-7 2017 Porkies Backpacking Trip >
          • Porkies Backpack Trip Day 1
          • Porkies Backpack Trip Day 2
          • Porkies Backpack Trip Day 3
          • Porkies Backpack Trip Day 4
      • April 2017 Backpacking/Camping/Hiking
      • March 2017 Hiking/Camping More Preparations
      • Feb 2017 Hiking/Camping
    • 2016 Hiking/Backpacking/Camping Season >
      • December 2016 Hiking/Camping
      • November 2016 Hiking/Camping
      • Oct 2016 Boundary Waters Canoe Area Trip
      • August 2016 Camping
      • July 2016 Hiking/Camping/Backpacking
      • June 2016 Hiking/Backpacking/Camping
      • May 2016
      • April 2016
    • Shelters >
      • Tents >
        • Reparing Tent Poles
      • Hammocks >
        • Hammock Stand >
          • Portable Hammock Stand
        • SnakeSkins or Sleeves vs. Stuff Sacks
        • Hammock Suspension
        • Keeping Warm in a Hammock >
          • Lite Top Quilt or Bag Liner
          • DIY Under Quilt
    • Glacier National Park 2015
    • Training for Glacier National Park Backpacking Trip
    • Backpacking Stoves >
      • Trangia 27-3 UL Stove >
        • Cooking with Trangia
        • ALOCS Trangia Look Alike Burner
      • Fancee Feest Stove >
        • Fancee Feest & Stanley Cook Pot
        • Another Cat Food Can Stove
      • DIY Alcohol Stove
      • DIY Igniter for Alcohol Stoves
      • Wood Burning Backpack Stoves >
        • Emberlit Fireant
        • Lexada Wood-Gas Stove
      • Gas Cannister Stoves
    • Backpacking Food >
      • Cowboy Coffee
      • Santa Fe Cheesy Beans and Rice
    • Other Gear
  • Adventures
    • 50th Anniversary In Alaska >
      • Day 1 Sites in Fairbanks
      • Day 2 Morning River Boat Cruise
      • Day 2 Afternoon travel to Denali
      • Day 3 Denali History Bus Tour >
        • McKinley Wilderness Princess Lodge Photos
      • Day 4 Coach ride to Anchorage/Whittier
      • Day 5 Ship Cruise at Yakutat Bay and Hubbard Glacier >
        • Photos of Yakutat Bay
      • Day 6 Galcier Bay
  • RC Planes
    • 2018 Flying Season
    • 2017 Flying Season
    • 2016 Flying Season
    • 2015 Flying Season
    • Great Planes Escapade - .40 size
    • T-6 Texan
    • Cessna 170
    • Fokker V.23 WWI Combat Sport Scale Plane
    • Great Planes PT-40 Trainer
    • Great Planes Combat Spitfire
    • Hobbico TWINSTAR
    • Other Planes >
      • Flite-Test FT-Cruiser
      • Micro Fokker Eindecker by Dave Robelen
    • Things I've learned....
  • About
    • July 12, 2017 Flood
  • Other....
    • Remembering Charles & Eva >
      • Feist Family Photos

 Portable Antennas and related things

This page and the ones that follow are focused on portable antenna options that I have been or am playing with. None are necessarily recommended and all this should be taken "for what it's worth." But all of them have worked for me in some situation. Perhaps it will inspire someone to try something. If so, I'm happy!
2018-10-08 Some of us just like to play with different antennas. Over the last hour I had 3 QRP QSOs on 3 different antennas and 2 bands. All about 600 miles, all with Q5 reports. Curiously the lowest report was on 40m with my G5RV, 539! 2nd QSO was on my Link dipole on 30m. Third was on my 35' EF on 40m. I strung up and took down both the link dipole and 35' one during that hour. All fun and with the x5105. All CW. And with zero sunspots! Got my QRP and antenna "fix" for the day!☺
Link Inverted Vee
40/20 Trap Inv. Vee
Fan Inv. Vee
35 ft. End fed
End Fed Half Wave
Picture
My Collection of portable HF antennas, Top back: Mag Loop. Left: two push up fiberglass masts with guys and tent stakes. Center: Wolf River Coils Silver Bullet 1000 TIA with radials. Bottom Left 4 band trap inv. vee. Bottom Center: 35' end fed. Bottom Right: 4 band link inv. vee. Very Bottom: shock cord for ends of inverted vee antennas.

Backpack-able HF Antennas

As with the radio or rig itself, key issues for a practical HF antenna for a long wilderness backpacking trip should be light, consume little space in your pack and be easy to put into operation. To fit well inside the pack with everything else they need to be physically flexible. My experience with backpacks is that they are stuffed absolutely tight with few "straight areas" for anything rigid or more than a foot or so long. I suppose you could hang some rigid pieces on the outside but the likelihood of damage as the pack gets tossed around on the ground and getting snagged as you clamber through the brush seem like hassles to me. So I lean toward wire antennas. They can be relatively efficient, eminently flexible and fit into a pretty small space.

Throw Lines

2018-08-17 I've tried various combinations of cord and water bottles, etc. to come up with a reasonable throw line for hanging an antenna in a tree. All with varying success. I have learned to use an old re-filled water bottle as very likely it will break in the process. At least once I got the bottle caught in the fork of a tree and could not get it loose. The amazing thing is that it "served" for years through the harsh winters of Wisconsin supporting one end of my G5RV! But I've been fascinated by the yellow line with a little red bag on the end that many use in their YouTube videos! So finally, I broke down and ordered one on Amazon the other day.
When it came I was a bit surprised that the bag wasn't attached to the line! So I set about attaching it. My criteria was that the knot should not be snag-able. Of course nothing will ultimately meet that criteria. Trees have an uncanny and unexpected ability to reach out and grab almost anything! But I think I have it, though mind you it is untested at this time.
I decided to loop the yellow cord through the ring on the little red bag overlapping itself about two inches. Then I used dental floss to wrap and tie the overlapping section tightly together. Finally, I put a section of shrink wrap tubing over that. Whether it works or not, it looks good! I'll let you know down the road whether it is a good idea or just an idea.

Portable Masts

2018-08-07 Another issue with operating portable is how to support your antenna. Trees are probably the most common supports used. And when available and about where you need them, do work well. Sometimes they simply don't work because they aren't available or are in the wrong place, or sometimes are the wrong type for what you want to do. Enter the portable mast. If you are driving to the operating site you can buy or fabricate various masts that can be attached to your vehicle or to a platform of some sort that you can put under a car tire. If you are walking to your site weight and bulk become larger issues and things like fiberglass or bamboo fishing poles may be an option. The ideas are endless. Click here or the Portable Masts heading above for my experiences.

Inverted Vee

An inverted Vee is a good antenna and is about as simple to make as a dipole. It is simpler to set up because it only requires a single support for the center. The ends simple droop down toward the ground so can be tied off to tent stakes, rocks, small trees or whatever. I played with two multi-band versions, a Fan style and a Trap style. The fan style simply has an element (two wires or legs) for each band, in this case 20 and 40 meters. The trap style has a single element divided by a parallel tuned circuit that electrically isolates the shorter portion for the 20 meter band while allowing the full leg length to be used on 40 meters. Each has its advantages and disadvantages. The main advantage of the Fan style is relative simplicity of building and tuning it. It's main disadvantage is that it takes four tie off points rather than two and has more wire to be fiddled with in both set up and take down. The advantage of the trap style is that it only requires two tie off points and so is simpler to deploy. It's main disadvantage is that it is somewhat more complicated to tune.

PAC-12 Rigid vertical

Dipole

A dipole is a very good candidate. The down side seems is the requirement of a feed-line and the need for two supports. Of course an inverted Vee configuration makes supporting it easier.  A possible negative is that they are generally single band antennas.
A video by K1YPP talks about two portable antennas that caught my eye. The simplest is simply a dipole attached directly to the radio with no feedline or tuner. He suggests it can be configured like a Vee (as opposed to an inverted Vee) by throwing both wires up into trees. Or you can put one in a tree and the other on the ground. I haven't tried this yet but it sounds interesting. The limitation is that it is a single band antenna.

Magnetic Loops

Another very interesting antenna is the small magnetic loop antenna. Commercially they are kind of expensive. Could one build one that would work? One I saw being discussed by members of the 4SQRP club recently is the Alexloop. I'm not in any way promoting it, it is just one example.

End Fed Antennas

End fed wires are another option. I've played with half wave version in the past but never very seriously. But for this trip I want to explore them more thoroughly as they have the potential of multi-band use which is attractive. A potential negative for almost all end fed wires is the requirement of some kind of tuner or matching network. Two that matching approaches I've had some success with are a simple tuned-secondary transformer with very small primary. I describe it in detail on the page for End Fed Half Wave antennas. The other one is called the Tuna Tunah ii offered by QRPme. Both are built in a tuna tin, so pretty are small and light.

The second antenna suggested by K1YPP in his video is a 51 ft wire and a counterpoise tied directly to a tuner. Another variation I've seen is a 35 ft wire and counterpoise, and I've experimented with using the 33 ft 40 meter half wave on other bands with some success.
My plan is to explore some of these options, especially the wire antennas as they seem like the best candidates as I see things now.

Portable Antenna Related Resources

QRPGUYS
Baluns and Ununs
Backpack Ant. Discussion
The WireMan
PackTenna
Proudly powered by Weebly