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HF Propagation


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Multiband HF Projects - Loop Antennas

Click to enlarge"Slinky" Helical Magnetic Loop Antenna by N4SPP
A standard Slinky is a toy made from a flexible 90-turn metal spring. It has diameter of 2 inch (≈7 cm). Each Slinky contains about 67 feet (20 m) of flat steel wire (1/10 inch wide), and weighs approximately pound (225 gram).

4-Band Cola Antenna (20-17-15-10m) by G8ODE
Deploying a centre fed open loop half-wave dipole in a square shape lowers the impedance to around 8-12ohms.

40m-10m Delta Loop Antenna by GU3WHN
This simple broad band antenna is easy to build, has gain similar to that of a dipole and is tolerant of nearby objects. It can be erected in almost any configuration provided the wires are well separated otherwise it acts as a singe band broadband dipole.

Click to enlargeA homemade magnetic loop for 10-17 meters by PA3FG
Magnetic loop antennas are very compact hf antennas. If properly build they can be used for transmitting. There are already many good theories about them so i will keep this part of the story very short.

Click to enlargeA Magnetic Loop Antenna by G3YCC
Various articles have appeared describing magnetic loops for HF use, some with complicated methods of remote tuning and the antenna can be quite a useful and interesting project.

Click to enlargeA Magnetic Loop Antenna for Shortwave Listening (SWL) by KR1ST
The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor.

Click to enlargeA Wide Bandwidth Active Loop Receiving Antenna by MAYF
A versatile wide bandwidth receiving antenna suitable for general short-wave amateur band reception. This antenna has also been used successfully for the reception of QRSS signals in the 20, 30, 40, 80 and 160 Metre bands.

Click to enlargeCobWeb Aerial by MPZT
Back in the summer of 2012, I decided that I wanted to build a CobWeb.
Much of the inspiration was obtained from G3TXQs CobWeb webpage.

Click to enlargeExperimentele HF-antenne voor de kleine tuin door PE1HOY
De ruimte die Markus, PE1HOY in Uithoorn, voor een antenne beschikbaar heeft is ongeveer 8 tot 9 meter, van het woonhuis tot de schuur.

Foldable Mag Loop 40m-17m by PAWIT
The small HF magnetic loop is made from standard aluminium profile purchased from a hardware store. The six main sections are 67cm (26.4") long, this length maximises the number of pieces that can be cut from two 2.5m (8.25 ft) lengths of aluminium square tube.

Click to enlargeHF Receiving Loop by VK2ZAY
This experiment was inspired by Peter VK2TPM's receiving loop experiments for 80 metres. My loop is a bit smaller than Peter's, a single turn, the circumference is 4 metres + a little for the aligator clip lead, made from medium gauge mains lamp cord ("zipcord" for the yanks).

Click to enlargeMagnetic Loop Antenna by LA6NCA
For communications from 20 to 200 km is this small loop better or as good as a full size field mounted dipole. An HF whip antenna is also mounted on the car. The magnetic loop is fare better than the whip antenna.

Click to enlargeMagnetic loop antenna for 160 to 15 metres by VK3YE
October 1997's Novice Notes looked at compact antennas that amateurs use to operate from confined locations. The smallest antenna described for 80 metres was a magnetic loop. This article provides all the details needed to build your own.

Click to enlargeMagnetic loop HF antenna by G3XBM
In the last few days I have been experimenting with an HF magnetic loop antenna for the first time. These antennas are well known and work well, but for some reason I've never used one apart from on 136 and 500kHz where I used an 80m square magnetic loop made from standard PVC covered wire.

Click to enlargeMagnetic Loop With Capacitive Load For 30-10m by HB9MTN
A light and portable Magnetic Loop Antenna with improved Bandwidth and Performance

Click to enlargeMultiband Deltaloop by DL2HCB
After a Qth change last year, I was fortunate to get permission for an outside antenna. The new antenna was built with the following considerations in mind: At least 10 - 20m coverage; Open wire feed to simplify matching ...

Multiband Vertical Loop Antenna 10, 14, 21, 28 MHz by VE2AZX
- The wave emitted by the vertical loop may be polarized vertical or horizontal depending on the feedpoint location.

Click to enlargeMy Magnetic Loop Antenna by KR1ST
I built this antenna when I lived in an apartment complex which does not allow antennas and where I had no real estate to play with.

Click to enlargePacking Crate Antenna by SMVPO
I have been placed in a situation where a landlord denied permission to erect an antenna. Any form of antenna was unreasonable, even a white-painted broom handle caused interference!!

Click to enlargePedestrian mobile magnetic loop for 40 to 10 metres by VK3YE
I've described a few magnetic loops for HF pedestrian mobile. This one is my favourite. It's light and robust enough to use for hours at a time yet performs well on the busiest HF bands.

Click to enlargePedestrian mobile magnetic loop for 20 to 6 metres by VK3YE
In 2012 I made a 40 centimetre diameter magnetic loop antenna for pedestrian mobile. Covering 21 to 50 MHz.
I've since made a SummerLoop II using parts from the Original.

Portable Mag Loop For 40m-10m by G8ODE
The square loop has 60cm sides and, with the capacitor, tunes from 7.0-30 MHz. The Faraday coupling loop is approximately 1/5 (2.4m + 10cm wire tails) of the circumference of the loop. It is better to make the loop slightlylonger and trim for an SWR of 1:1 (ref 50 ohms) on the lowest band.

Click to enlargePortable Small "Magnetic" Transmitting Loop for 40-17 mtrs by N4SPP
Mid-2012 I acquired a portable QRP rig: a Yeasu FT-817ND (HF + 2m + 70cm, 5 watt). So I needed a portable loop (40-20 or 40-10). Such loops are available commercially for several hundred euros/dollars. You can make one yourself for a fraction of that price.

Click to enlargeRaamantenne voor de 160, 80, 40, en de 20 meterband door PE1KQP
Het concept van deze antenne is niet nieuw, maar door de goede verkrijgbaarheid en lage prijs van de zogenaamde hengelmasten ( 12 m lang ) is het mogelijk om een veelzijdige vakantie antenne te maken.

Simple RG213 Mag Loop (30m-15m) by G8ODE
Its amazing what you can do with a bit of spare coax and an old vintage brass 130PF capacitor with 1mm spacing. During the Lighthouse weekend, when the local QRN was really bad, this simple loop was constructed and performed remarkably well.

Click to enlargeSMVPO-style Spiral Loop Antennas by N4SPP
This antenna is very compact: ≈ 120x120 cm (4x4 ft). It is basically a transformer loop antenna: it consists of a multi-turn tuned loop and a small feed loop. The tuned loop is spiral-wound and square, has about λ total wire length.

Click to enlargeSmall "Magnetic" Transmitting Loop for 80-20 mtrs by N4SPP
Print page button This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up.

Click to enlargeThe G4ILO Wonder Loop by G4ILO
The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. It is designed for portability, and can be assembled or disassembled in about a minute.

Click to enlargeThe Rockloop by W9SCH
W9SCH described this small loop in Sprat 60 and it has proved useful to the QRPer, ... It is basically a variant of the usual magnetic loop, using a toroid balun to get a reasonable match on the three bands.

Click to enlargeW9SCH's Rockloop Antenna by DL1GSJ
Years ago I started experimenting on magnetic loops & Co; I like the idea of narrow resonant aerials. When I saw the rockloop I never believed it might work (Ohmic resistance of the wire).

Click to enlargeWide Band Active Loop Receiving Antenna by PA3GZK
If one has no place for an antenna of sufficient length for receiving radio signals, a small active antenna may be the solution and you may find on the Internet a lot of related publications.

Creation date : 11/08/2007 @ 14:50
Last update : 06/03/2019 @ 22:21
Category : Multiband HF Projects
Page read 47452 times

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