Describing and demonstrating an end-fed multiband antenna for portable use.
It’s a full-sized half wave on 20 metres and a loaded half wave on 40 metres. The antenna also works on 10 metres. It’s not recommended for use on other bands.
A broadband transformer replaces the antenna coupler. While it’s likely less efficient than an L-match antenna coupler this arrangement allows instant band changing. Its only disadvantage is that its bandwidth on 40 metres is somewhat narrow (150kHz approx) when used with the loaded half wave wire described.
Similar to the Par Endfedz design this transformer will work on other bands with a half wave wire. With 10m of wire I could get low SWR (as indicated by the FT-817’s indicator) on 20 and 10m. 20m of wire gave those two bands plus 40 and 15m. Some variation of the trimmer will however be necessary so it’s worth carrying a small screwdriver, preferably attached to the transformer unit to prevent loss.
There’s a bit of cut and try in construction. Those wanting a premade unit should investigate either the Dutch HyEndFed or the American Par Endfedz 40/20/10m end-fed models. Both have received good reviews on eham.net .
Check these links for further info:
* http://pages.suddenlink.net/wa5bdu/ef…
* http://pa-11019.blogspot.com.au/2012/…
* http://www.hamradio.me/antennas/lnr-p…
* http://www.eham.net/ehamforum/smf/ind…
* http://pa3hho.wordpress.com/antennes/…
* http://www.hyendfedantenna.nl/joomla/…
* http://www.parelectronics.com/end-fed…
* http://www.eham.net/reviews/detail/5105
* http://www.mwrs.org.au/wp-content/upl…
The USA contacts included were on 20 metres, made in the morning. Good contacts have also been made within VK on 40 metres.
Recent Posts
Carribean Tropical Storm Earl – Emergency activities
Tropical Storm Earl is currently heading across Central America affecting the countries of Honduras, Guatemala, Belize and Mexico. IARU Region 2 has r... Read more
Canada Day 2020 Contest Under Way
Each year on July 1, the anniversary of Canada’s Confederation, Radio Amateurs of Canada (RAC) sponsors the Canada Day Contest. The event continues un... Read more
ARRL Contest Results Posted
The Preliminary 10 Meter Contest results have posted, as have the preliminary 160 Meter Contest results and the full 10 GHz and Up Contest results. Vi... Read more
New Spratlys incident delays emergency evacuation of sick ham radio enthusiast from Pag-asa
InterAksyon.com The online news portal of TV5 MANILA, Philippines — The emergency medical evacuation of a sick amateur radio enthusiast f... Read more
David Clark DC PRO-X Hybrid Electronic Noise-Cancelling Headset
David Clark DC PRO-X Hybrid ENC Technology in a Supra Aural (Rest-on-Ear) Headset Design Leading edge technology and sleek, supra aural design put t... Read more
TO5FP – St. Pierre & Miquelon
Team F4HEC Freddy, F1RAF Nicolas, FK8IK Michel, F5TMJ Laurent is currently activating FP (DXCC 277, NA-032) until september 20th 2016. Activity expec... Read more
The K7RA Solar Update 12/18/2015
Australia’s Space Weather Services issued a geomagnetic disturbance warning at 2224 UTC on December 17. It read in part, “Two coronal mass ejections o... Read more
Ultimax Extreme Antenna 1.0 to 54.9 MHz
The ULTIMAX DXTREME end-fed antenna covers from 1.0 to 54.9 MHz continuous and is rated at 2 KW (SSB) , 1.2 KW CW & RTTY. The DXtreme com... Read more
RigPi RigPi MFJ-1234 Station Server, Remote Ham Radio @Hamvention
RigPi MFJ-1234 “Our first look at the brand new RigPI Remote station server called the MFJ-1234. This little beauty allows you to connect and co... Read more
ACOM ATU04AT- REMOTE AUTOMATIC ANTENNA TUNER AND SWITCH
Remote matching of antennas – less losses in the feed line. Designed for installation in a shack, under a shed, or in open (see mounting kit opt... Read more
Carbon Fiber Mast for Ham Radio Antennas
Carbon Fiber Masts from Gigaparts for your Ham Radio Antenna – these masts come in 3 different sizes, this one being the 50′ version. This... Read more
San Felix DXpedition…. Bad News
“The following (translated) appears on the Radio Club de Chile (CE3AA) webpage: On September 6, 2016, Radio Club of Chile, represented by its Pr... Read more
Financial Woes Reported at Dayton Hamvention Venue – Hara Arena
Source: By Jill Drury – See More: Hara Arena Photos: Read more
70 MHz: BNetzA allows operation in Germany
During the Sporadic E season 2017, German radiators of approval class A can again use a section of the 4 m band at 70 MHz for experiments. The officia... Read more
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Ftriband-end-fed-half-wave-antenna-for-portable-use%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
