There are no ads, please add some
by David B. Murray, KD1BL
Background:
While taking the Level II Emergency Communications Course, my mentor, Ron Kane (AD6KV) presented information on Near Vertical Incidence Skywave (NVIS) operation. Being interested in the reputed “no holes” coverage in mountainous regions, I used the Google Search Engine to learn more about NVIS antennas. With the wealth of information about NVIS operation available on Google, this artical will focus on construction and effectiveness of my “cloud warmer”.
Bill, W1WAW, and I decided to set up NVIS antennas at our respective locations in northwest Vermont, and to use them to communicate on a daily basis over the two major ridges between us. I also have a CW-160 antenna averaging 40 feet high, so that antenna provided a comparative benchmark. We have held 8AM QSOs daily for about 4 months. Recently Earl, K1YLB, joined us each morning using his NVIS dipole which slopes from 10 to 20 feet above ground. Bill’s NVIS dipole is constructed much as presented below, and is 10 feet above ground. Mine is hung at 8 to 10 feet above ground between two trees.
What we have learned has been very positive! Thus this article.
Range:
The 80 meter NVIS antenna consistently provides dependable communications from the northwest corner of Vermont to over a 350 – 400 mile RADIUS range, covering all of New England, down into Pennsylvania, and westward to the Niagra Falls area. I have been able to communicate reliably with any station in that area without asking for fills. The message gets through! My 40 meter NVIS work has been more limited, but I expect to have developed more information by the spring of 2008. The NVIS antenna should be a strong candidate for emergency communications in mountainous terrain!
* This article accurately shows the layout of the 75/40 meter antenna. All the performance information in this article relates only to use of the 75 meter portion. My experience has shown that 40 meter NVIS activity has been possible only since early November. Using the NVIS F2 Layer Status Map one can learn toknow when 40 meter NVIS work is possible. That map is updated at about 42 minutes after the hour. During the late Fall to early Spring, I expect to see daily 40 meter NVIS work available.
Read Full Article:
VIDEO
A powerful HF to VHF transceiver from Expert Electronics The SunSDR2 PRO is the latest transceiver from Russian company, Expert Electronics, and packs... Read more
Frank Donovan, W3LPL, notes that the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center (SWPC) has published its o... Read more
MacLoggerDX HD is an Amateur Radio application that monitors the spots from your favourite DX Cluster for DXing, Contesting or casual rag-chewing. It... Read more
Telegraph Machine “On 6th January 1838 Samuel Morse’s revolutionary telegraph system was demonstrated for the first time at the Speedwell Iron W... Read more
INTERNATIONAL REPLY COUPONS– Read Full Article: Read more
Resonant frequency [Resonance frequency]: 28, 21, 14 MHz Frequency [Frequency]: 24, 18 MHz Logoperiodic Number of elements [Number of elements]... Read more
What is POTA? Parks On The Air Ham Radio Read more
The World Wide Radio Operators Foundation (“WWROF”), in collaboration with the Slovenia Contest Club (“SCC”), is pleased to announce the first annual... Read more
Icom IC 705 10 Features in 10 Minutes Read more
The Mar-April issue of CQ is now online for the digital subscribers. See more: Read more
Moonbounce enthusiasts are invited to take part in a commemorative Earth-Moon-Earth (EME) slow-scan television (SSTV) party on 23 centimeters, marking... Read more
Icom IC-7851 vs Kenwood TS-990 Read more
Steve Andrew has just added a couple of cool new features to his popular Spectrum Analyser software which works with all the SDRplay RSPs. is latest r... Read more
The KAT500 is a high power autotuner that can be used with both the K3/KPA500 and all other HF amplifiers and transceivers. The KAT500 uses the same... Read more
The Russian Woodpecker – Trailer A Ukrainian victim of the Chernobyl nuclear disaster discovers a dark secret and must decide whether... Read more
Recent Posts
SunSDR2 PRO Review by RadCom
New NOAA Updates Solar Cycle 25 Prediction
MacLoggerDX HD for iPad
Morse Demonstrates Telegraph Machine
All About INTERNATIONAL REPLY COUPONS by N6HB
Yagi Antenna GXP-7 (7 elements 5 bands)
What is POTA? Parks On The Air Ham Radio
World Wide Digi DX Contest
Icom IC 705 10 Features in 10 Minutes
The Mar-April issue of CQ is now online for the digital subscribers
EME SSTV Lunar Landing Commemorative Event Set
Icom IC-7851 vs Kenwood TS-990
Yet more features in the SDRplay Spectrum Analyser
KAT500 High-Power Auto-Tuner & Smart Antenna Switch
The Russian Woodpecker – Trailer
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fa-portable-7540-meter-nvis-antenna%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
