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
“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
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
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
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