A Super J-Pole Antenna for the 70Mhz (4m) Amateur band.
The Vortex ‘Super J-Pole’ Antenna consists of a five eighth wave vertical radiator, a half wave tuning section and a half wave top section. At the base, a quarter wave matching stub forms the classic ‘J Shape’. The addition of the extra half wave top section boosts the gain over a standard J-Pole. The Super J-Pole has an added advantage that tuning can be varied over a fairly wide frequency range by moving the feed-point location up or down. This also gives the user finer control over the impedance and match. The antenna is end fed and has an omni-directional radiation pattern and requires no ground plane or radials. The antenna has a nice low angle of radiation, typically 8 degrees when mounted at 4m in height. This angle reduces further the higher the antenna is mounted. A typical installation with the antenna at 8 meters above ground sees the angle reduce to 5 degrees and the gain increases to 7.29dbi when ground reflections are added….
Read Full Article: Link
Antenna
![HF Loop Antennas – ARRL The Doctor is In [ PodCast ]](https://qrznow.com/wp-content/uploads/2017/02/11825222_887255654645435_1859337703964508434_n-265x168.jpg)
HF Loop Antennas – ARRL The Doctor is In [ PodCast ]
“HF Loop Antennas” is the topic of the just-released episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX Enginee... Read more
Four-square eight directions antenna system, with dummy load power indicator and high power
4SQ-8DIR antenna system The four-square phased-vertical array if used by many contesters and DXers for oreration on the low bands. This construction m... Read more
Slim Jim Antenna Project
Slim Jim Antenna The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentra... Read more
HF Omniangles HF-28 ( 10 Meters )
HF Omniangles Our HF line of horizontal omnis are a bit different than the VHF and UHF models in that they aren’t as excellent from an omnidirec... Read more
XR3-NV | HIGH PERFORMANCE 14 ELEMENT 20 / 15 / 10 METER MULTI-MONO CONTEST YAG
The Ultimate Contest Tribander: fourteen elements delivering superior performance on 20, 15 and 10 meters! Click here to download a PDF of the XR6 pro... Read more
500 mW on 7 MHz with the Wadetenna
Testing the Wadetenna on 7 MHz SSB. Only 500 milliwatts was used instead of the usual 5 watts. Contacts up to about 500km, mostly to portable stations... Read more
The New Carolina Windom By Len Carlson, K4IWL
“ As with all ham stations QRO or QRP, ten percent ofa station?s success in quality QSOs is the equipment and the operator. Ninety percent is th... Read more
New! Bonito Loop ML-200
The Bonito ML-200 is a wide band active antenna for reception of long, medium and short waves as well as the lower VHF band. The antenna is is charact... Read more
Radiowavz Sentinel Expedition
“Hope (KM4IPF) talks about the Radiowavz Sentinel Expedition Hex Beam that she and her siblings have been using. They have come up with a few ti... Read more
Feed Point Sealant
Description Liquid Rubber Feed Point Sealant 30ml bottle with brush-in-lid Applicator We have formulated an excellent UV resistant rubber sealant to e... Read more
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fa-super-j-pole-antenna-for-the-4m-70mhz%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
){kind=link}