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
A High Efficiency Extended Length Mobile Antenna
By W5JGV I originally wanted an antenna that would not hit everything overhead while driving, since it was to be installed on a van. I came up with an... Read more
IARU Region 1 Monitoring System Says Radio France International Splatter “Untenable”
The International Amateur Radio Union (IARU) Region 1 Monitoring System (IARUMS) August newsletter reports that Radio France International was active... Read more
Baofeng DM-5R Buyer Beware by VE3IPS
“I have been alerted by several hundred emails about the launch of the new Baofeng DM-5R (I am the President of the Toronto Baofeng users group... Read more
The K7RA Solar Update – 03/18/2016
Solar indicators were lower this week, while geomagnetic indicators were higher. Compared to the previous seven days, average daily sunspot numbers in... Read more
Visualizing RF Standing Waves on Transmission Lines
This video illustrates how RF (radio frequency) standing waves are created in transmission lines – through the addition of the forward (t... Read more
MRF1K50H: 1500 W CW over 1.8-500 MHz, 50 V Wideband RF Power LDMOS Transistor
This high ruggedness device, MRF1K50H, is designed for use in high VSWR industrial, scientific and medical applications, as well as radio and VHF TV b... Read more
How to Receive Beautiful Images of the Earth Directly From Space | GOES-15,16,17 and Himawari 8 HRIT
“In the fall of 2016 I saw my first rocket launch and little did I know that the satellite on that rocket would come to shape and fill my though... Read more
RadCom Plus, Vol. 2, No. 1
4 DATV video link Construction, testing and characterisation Mark Atherton, ZL3JVX has been working on a 1.3GHz digital video shack-to-repeater link u... Read more
PJ4VHF Listen D4C/B – Transatlantic Beacon reception on 144 MHz
A post on the D4C Facebook page says: On May 6, 2015 history was made on contact across the Atlantic on VHF bands on the W-E path: The new D4C... Read more
2016 CQ WW CW Disqualification List
List of entries disqualified from the 2016 CQ WW CW Contest . 5Z4/DJ6TF 5Z4/DL2RMC 9M2R BA3MM BG3IAY CO8ZZ CR5K DR5E EE8E EU8R I1EIS KP4BD OU2W R5WW R... Read more
QCWA Donation to Support ARISS Space Station Hardware Upgrade
Amateur Radio on the International Space Station (ARISS) has announced a “notable contribution” from the Quarter Century Wireless Association (QCWA) t... Read more
Nomination Deadline Extended for Philip J. McGan Memorial Silver Antenna Award
In light if the coronavirus pandemic, the ARRL Public Relations Committee has extended the nomination deadline for the Philip J. McGan Memorial Silver... Read more
HamCation 2017 -Orlando/FL – 71st edition
“HamCation® 2017 is just around the corner. Time is flying, before you know it the 71st edition of the second largest show in the United States... Read more
Storm Storm Comes & How Starlink Fell | Space Weather Briefing 02.09.2022
Storm Storm Comes & How Starlink Fell | Space Weather Briefing 02.09.2022 Read more
The Hobbyist’s Guide to the RTL-SDR : Really Cheap Software Defined Radio
Available for PC, Mac, smart phones, tablets or Kindle devices A comprehensive guide to the RTL2832U RTL-SDR software defined radio by the authors of... 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
