Simple, Elegant, Low-Cost, Low-Risk.
Also Available in 40, 30, 17, 15, 12, 10 and 6 Meters
Someone once said the best things
are usually the simplest, how very true in this case. This adage can be applied
to amateur radio antennas as well for one of the ham radio lessons learned over
the years is- if you can put up a dipole, you should. This is a different method for operating portable QRP. Since we need to maximize the 1-25 watts available to us, eliminate feed-line loss by connecting the antenna directly to the radio. No bulky, heavy coax to carry. No lossy RG8X or RG58 to deal with. If your radio has a BNC female connector, this antenna will directly connect. If you wish to connect to another terminal such as an SO-239 an adapter is required.
For
Portable, Stealth, Emergency or Everyday low power operation, a resonant dipole
is one of the most cost effective, highest value, best performing antenna
solutions available. Using these principles, we have created an ultra-portable,
mono-band, rapid deployment, half -wave dipole antenna. Our dipole
requires no assembly and can be erected in minutes. Designed as a QRP
primary antenna, it also functions as a quick deployment auxiliary, emergency
or backup antenna in the event a primary antenna experiences difficulties. It's
also a great, inexpensive gift to give to those involved with amateur radio
that requires no additional finishing. It fits easily into your pocket,
glove box, bag or carrying case.
Check out our antennas in action here:
HamRadioConcepts - Stealth Dipoles
and here:
HamRadioConcepts - FT-817 Portable Communications
and here:
20M Dipole Testing Multi-Band Dipole Testing
For 22.00 you will receive:
Many
experienced hams would agree that it's easy to erect an antenna system inferior
to the standard half-wave dipole, but very difficult to out-perform one. It
seems to me that wire antennas, in general, tend to be overpriced for what you
get. Determining what type of antenna to use for radio operations can be a
frustrating experience but justifying the expense for some of them may even be
more so. As a new ham, I wanted to get on the air with something that was worth
what I paid for it and have it perform to expectations. This wasn't always the
case, either in cost or performance. So I now offer something that I would have
wanted, but could never find: a simple, functional, easy to use and deploy
resonant dipole antenna for around $20 bucks. That's all there is to
it.
This
antenna shown is a classic 20M half-wave dipole optimized for QRP / QRP Portable and
Stealth operation. It takes almost no space and weighs almost nothing, and is
nearly invisible 20 feet in the air. It consists of a binding post with a BNC Male connector, 20 AWG stranded, UL-1007 tinned-copper antenna wire
and two (2) ring connector eyelets at each end, thoroughly insulated with
waterproof marine-grade heat shrink on both ends for maximum strain relief. All
electrical connections are soldered using silver bearing rosin-core solder. Weighing
less than 5 ounces, (141 grams) this antenna is a half-wave dipole on 20
Meters. When compressed, it fits into a space 4.5" x 2.5" x 1.5"
(115 x 64 x 39mm). Extended, the dipole is cut for the middle of the 20 meter
band. Thus, the entire antenna is approximately 33 feet in length. It can be
used in any of the standard dipole configurations, flat-top, inverted V,
sloper, etc. Most often I use the flat top configuration without any center
supports, it's that light. But every operator will have judge the conditions,
landscape, and operational needs for themselves. Like any antenna however, it
should not be used near power lines.
The SWR values have been measured with an antenna analyzer, see the photos for
a chart. The 20 meter version is displayed but all bands from 40 meters up are available. Here in the Great Lakes area we have many trees, so to elevate the radials for portable use, one of the better solutions is an arborists throw bag and
slick line. This makes 30 feet or so perfectly routine and reasonable. With
practice and skill, more height can be gained and these items are easily found
on eBay. No doubt each operator will have their preferred method, but I find
these to be exceptionally light, compact, portable and trail-friendly.
Nothing else comes close in terms of value. I have used end fed wires,
portable verticals, rubber ducks, mobile ground-plane antennas, loading coils,
you name it. If purchased retail, all of these things are significantly
more expensive than this antenna. Even as purchased components and hand
assembled, they are all more expensive and will not perform any better. For
example, one can purchase, as I have done, a 9:1 matchbox for an end fed QRP
portable. One would still have to purchase the wire and assemble the antenna.
One also has to pay for shipping and wait for the unit to arrive. In total,
this can't really be accomplished for less than $50... try it. One could also
purchase the individual components and assemble the unit themselves, there are
no special tricks or techniques. In fact, I encourage the
home-brew-antenna-making art, but you would end up spending as much or more.