This projects was developed as a result of experiments to become QRV on 80 meters

The small single turn magnetic loop antenna consists of a single winding inductor, about 3 feet 1 meter in diameter, and a tuning capacitor

A loop useable from 7 - 21 mHz, using half inch copper tube 3 feet in circumference

One major problem receiving long waves e.g. 137 kHz ham band is the presence of local noise sources

A versatile wide bandwidth receiving antenna suitable for general short-wave amateur band reception

Althoughthe loop has less gain than a dipole, the radiation pattern and small size make the antennaquite useful for certain situations

Receiving antenna for LF-MF with good performance from 100 kHz through 2 MHz

To build a relatively small loop antenna which can be placed for instance at the balcony

I have slowly developed my loop antennas into fully automated, remotely controlled, high power 500W antennas for the 80m through 6m bands

The air core loop antenna reproduced here has basically the same characteristics as a frame loop that also uses air core

This antenna is picking only the magnetic part of the elektro magnetic radio wave

CV equals 230 pf, gauge is at the end, the CV equals 230 of the 4mm bla

Loop ad onda intera realizzata per la gamma degli 80 metri

Costruire una antenna portabile per essere subito operativi almeno in 15 e 20 metri

Il condensatore scelto è un modello sottovuoto, 5 kV, corrispondenti a più di 100W

E' un LOOP sintonizzato e schermato elettro staticamente

I decided to look for an active magnetic loop antenna and started to gather data and compare them, here is what I found

On VLF and LF, a compact and portable loop antenna was built this article shows the prototype of an active VLF loop antenna

Although this online calculator is intended to assist with designing and building homemade, ham radio loop antennas for use in the HF bands, magnetic antennas have been constructed that function in the VHF or even the UHF frequencies

The antenna is about 30 metres from the shack and at the highest point of the garden, the loop was wound with 36 turns and centre tapped, the inductance was found to be about 3 mh. 30 metres of rg58cu has a capacitance of about 3000 pf

Frame loop antennas are used on 136 for receiving and usually consist of around 50 turns of wire on a 1 metre or so square framework, resonated to the required frequency, and matched by some form of link coupling

In the space between the two ends a variable capacitor is placed and tuned to resonate at a specific frequency

Thus for F = 136kHz wavelength 2205m if the parasite is less than 110m, its magnetic field will be more than 10 dB below its electric field

The results not bad at all on 14 mhz, i built one for the 7 MHz, exagonal shape, the sides are 50 cm each, circumference 4 m, copper tube 16 mm in diameter

Ho avvolto circa 1710 m, di filo verniciato 0.50 mm di diametro, in un octoloop di 1 m di diametro fatto con tubo di plastica di 40 mm di diametro

Can the YouLoop give satisfactory performance for MF and LF band reception

Cerchione da bicicletta da 64cm di diamtetro senza raggi,un condensatore variabile 2X 350 pF,un condensatore variabile per i 10-15 metri da 50pF

Ho voluto provare un'antenna per la sola ricezione, si tratta di un loop magnetico quadrato, di 152 cm di lato, che ho costruito seguendo le indicazioni di KC2TX

Small loop in sprat 60 and it has proved useful to the qrper, especially where space is at a premium

Magnetic antennas can solve apartment-resident radio listening problems

Magnetic loop, made for bands between 40 and 15 meters, according to the diameter we can choose the bands or higher or lower

It goes without saying that the 50cm hoop is larger than the 35cm hoop, but what the other hears is received by the other

This mysterious small loop antenna that works on all HF bands

The loops shown are all coupled with a ferrite transformer which is used to match the 50 ohms coaxial feeder to the feed point resistance of the loop

Diameter 1.27 meters. perimeter 4 meters, width 80 mm. material dural alu,loop antenna with manual tuning motor drive is planned

Although a magnetic loop antenna aka small loop antenna is very compact, its efficiency is close to a half-wavelength dipole if carefully built

When building a magnetic loop antenna, one inevitably comes across the question of coupling

Antenna with a diameter of 80 cm. The motorized variable capacitor creates a frequency range from 29 to 14 MHz with 100 watt transmission power

An antenna that is extremely simple to build and theoretically has improved transmission and reception characteristics versus dipoles, ground plane verticals, and almost all alternative antennas that might be installed

Except for the coupling loop, which is made from RG-58 coax, the entire antenna is made from hardware store parts

In the 10-30 meter band a VSWR of almost 1:1 was achieved, also in the 40 and 80 M band a VSWR of less than 2:1 was achieved

Multi turn wire loops are often used as low frequency receiving antennas, the loop sensitivity decreases as frequency decreases

The inner conductor travels from the feed tee around the loop and is connected to the outer conductor adjacent to the feed tee

Tableantenna invisible loop antenna

All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier

A 10 ft length of 5/16in copper tube gives a 39in diameter loop

Foldable magnetic loop antenna that should be easily assembled and disassembled for QRP HF pack

The loop aerial has a natural resonant frequency at which the reactance of L equals the reactance of C and at which the response peaks such that the output voltage

I receive and transmit on 136 kHz 2200 m LF- band