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136 kHz Projects - Antennas

" ADA" : An Active Differential Antenne For 5Hz – 500 KHz by I1RFQ
This article describe the design, construction, measurements and receiving experiences made with such “exotic”antenna that fully covers ELF – SLF – ULF – VLF - LF and part of the MF.
http://www.vlf.it/cr/differential_ant.htm

"Lightweight" LowFER Verticals by KØLR
As anyone knows who has tried it, erecting a tall, flimsy mast with a large top hat presents quite an engineering challenge. Here is a description of two LowFER vertical antennas that are relatively lightweight and easy to erect, but rugged enough to survive at least a moderate ice or wind storm.
http://www.qsl.net/k0lr/LTWT-verticals/VERTS.HTM

137kHz E-Field Probe Antenna by G3XBM
This small E-field probe was developed for use on a car mag-mount antenna base, so I could drive around the local area (up to 25km) to measure the signal strength of my 137kHz QRSS3 beacon feeding a 20m spaced earth-electrode antenna in the garden.
https://sites.google.com/site/g3xbmqrp3/antennas/137efp

Antennas for 136kHz by ON7YD
The main object of this page is to provide information. It has been deliberately kept simple, no fancy and flashy tricks, in order to achieve maximum compatibility for the different browsers and to allow fast downloading.
http://www.strobbe.eu/on7yd/136ant/

Klik voor vergrotingA 10' Receiving Loop for LF DX Work by VE7SL
My ten foot air-core receiving loop was originally designed and constructed for NDB DXing. More recently, it has been pressed into service for LOWFER DX work.
http://qsl.net/ve7sl/loop.html

Klik voor vergrotingA Broadband Shielded Receiving Loop for LF DX Work by VE7SL
This is a description of a broadband ( ~40kHz - 500kHz) shielded receiving loop and preamplifier suitable for low-noise LF reception. The preamplifier was originally developed by the late Ralph Burhans, a dedicated engineer and LF experimenter.
http://qsl.net/ve7sl/burhans.html

A Really Simple LF Receiving Loop by KØLR
Mitch Powell has been having such good success with a receiving loop suspended in a tree that I decided to do the same thing. My original plan was to make an X-frame of PVC pipe with 15 foot diagonals.
http://www.qsl.net/k0lr/simple-loop/Simple-Loop.htm

Constructing a LowFER Antenna by W9RB
Getting on the air with a LowFER station is more complicated than getting on the ham bands since commercial equipment isn't available and construction is involved. The "RB" LowFER antenna is 31 feet tall with a 24 foot diameter top hat.
http://www.qsl.net/w9rb/webdoc11.htm

E-field Probe Antenna by G3XBM
Recently I have been trying out a small active voltage probe antenna to aid reception on the LF bands. I used a PA0RDT designed active antenna to listen successfully to amateur signals on both 500kHz and 136kHz.
https://sites.google.com/site/g3xbmqrp3/antennas/efp

Experimental 136kHz Vertical Antenna by G3YMC
The vertical at the G3YMC QTH is based on my old Butternut HF2V 40/80m vertical. This forms the vertical section of the antenna, and is free standing at 10m high.
http://www.davesergeant.com/vertical.htm

Receiving Loop for Long Waves by DF3LP
One major problem receiving long waves (e.g. 137 kHz ham band) is the presence of local noise sources. So I decided to erect an antenna which is able to cancel out this unwanted source.
http://www.qsl.net/df3lp/projects/lfloop/index.html

The Big Loop Project by VK2ZAY
OK, it isn't large in terms of the wavelengths it was built to capture, but large enough and composed of enough copper to need a substantial wooden frame. It has 51 turns of heavy (4mm squared) wire, a side length of 1 metre.
http://www.vk2zay.net/article/50

The G3YMC Loop Antenna by G3YMC
The QTH at G3YMC is in a typical suburban estate with terraced houses on all sides and a back garden of 15m x 7m. ... A loop antenna seemed the ideal answer.
http://www.davesergeant.com/loops.htm

The Octoloop by N4YWK
The octoloop is a length of 25 pair telephone wire inside an octagonal loop shield of 3/4 hard copper pipe. Mine is about 7 ft dia and wired for 50 turns, and gimballed for noise rejection.
http://www.vlf.it/octoloop/rlt-n4ywk.htm

Vertical antenna with inductive toploading by ON7YD
In an environement with a lot of 'vertical objects' (trees etc.) close to the antenna inductive toploading can significantly increase the performance of a short vertical antenna.
http://www.qsl.net/on7yd/indtop.htm

WD2XNS 137 kHz Transmit Antenna by W1VD
The Marconi transmit antenna in use at WD2XNS is easier to describe than it is to photograph! It's radiator consists of a #14 THHN vertical wire 95' tall. The top of the radiator connects to a three wire tophat suspended between two Rohn 25 towers (110' and 100' tall) that are located 100'apart.
http://www.w1vd.com/XNStxantenna.html

250 - 400 µH Variometer by GØMRF
Tuning an LF antenna can be tricky. An antenna that's much shorter than a quarter wavelength will have a high Q and consequently a narrow bandwidth. A loading coil with a series of taps can be used, but a constantly adjustable inductor like a variometer will make tuning a lot easier.
http://www.g0mrf.com/variometer.htm

Compact ferrite loading coil for LW antennas by DK5PT
What I am using for LF antenna matching is a relatively small ferrite pot-core instead of big coupled air coils.Pot cores are primarily used for power transformers in switching supplies , ...
http://www.wireless.org.uk/dk5pt-f.htm


Creation date : 07/08/2007 @ 22:01
Last update : 23/09/2018 @ 14:51
Category : 136 kHz Projects
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