Below is a diagram and some construction details, note that the element is continuous except for a gap at the top across which the variable capacitor is wired

The Delta loop has an impedance of about 100 ohms and to match it we use a quarter wave of 75 ohm coax in series to with the 50 ohm feeder

L'ottimo funzionamento della loop a onda intera sulle HF da non confondersi con la loop magnetica che misura una frazione di lambda mi ha indotto a sperimentarla in VHF

A high voltage shunt capacitor made from 154 cm 60.5 inches of RG-58/U coaxial cable approximately 150 pF

To build a loop antenna for low frequency LF and medium wave MW reception with remote-controlled tuning

The first part of this article dicusses an improvement to the loop antenna

The writer describes experimental work carried out on a CFA Loop for 3.5 MHz including the problems in making it work and the performance achieved

This controller has been designed to automate the control of magnetic loop antennas

Hula hoop long and medium wave receiving loop antenna

La soluzione che ritengo più semplice ed efficace è costruirsi un'antenna a telaio quadrato da 40 a 60 cm di lato, oppure esagonale

Segnale sufficiente per la normale ricezione è necessario l'uso di un preamplificatore da almeno 20db di guadagno

L'antenna loop in banda VLF costituisce un metodo valido per l'ascolto dei segnali presenti in banda il minimo ingombro e la versatilità ne fanno un elemento immancabile nell'ascolto amatoriale delle VLF

This loop antenna is that it is a high impedance loop, appear This means it can work directly with many receivers

Magnetic-loop that I am using for the 160m band, wich provides the best rejection of the white band noise generated by the 380kV power line, passing some 200m

The idea behind the double loop is that two properly polarised magnetic fields enhance each other and because the two loops are in parallel

My idea is not to tune the loop, but simply transform the complex impedance

The concept of the Hula Loop came after many years of building medium wave loops of varying size

Loop is built on a 23-inch quilting hoop, the base is seven inches in diameter and is sold as the mounting plate for clocks

20 meter loop antenna–it’s such a simple project and requires no special order components, in fact, all of the components save, perhaps, the antenna connector can be purchased at a diy store

My capacitor wasn't large enough to take the loop down to 80 metres, at least not without adding more turns

The first antenna of this type that i made, was something similar to a frame antenna similar to those used by the old am radios figure-1 left, with several turns of thin enameled copper wire and a variable capacitor between its terminals, about 300 pf

The range of 2.7 to 7.3 mhz, the variable tuning capacitor is a 3 recovery air cages on an old tube radio receiver

Ideale per il mobile, radio cluster, beacon VHF

The aea isoloop hf antenna was an antenna i used off the balcony in a chicago high-rise

Planned hinge-capacitor, remote control via motor-driven excenter, plates 25x25cm, spacing at 80m = 625 cm2/128pf = 4.88mm,spacing at 40m = 625cm2/14pf = 44.64mm

All the cores are connected in series with a centre connection after 20 turns, resulting in a rectangular coil of 20 + 20 turns

Using an alloy rim of a bike wheel to make a loop antenna

Aligning the antenna is straightforward, first set the switch to the first band position 20metres and adjust the corresponding trimme

The loop is 1.6m in diameter and uses 8 pieces of 15 mm copper pipe cut to 61cm long, it tunes from 20 through 80 meters

A properly designed and constructed small loop of nominal 1m diameter will outperform any antenna type except a triband beam on the 10m/15m/20m bands

I thought that two loops shaped as the figure-8 might bring relief and that with two paralleled loops the impedance at the tuning point might decrease and that the magnetic fields support each other

A 145 MHz 2m loop, using the software at the bottom of this page, i worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency

Tuning capacitor and section of 160m-loop 7/8" Cellflex-Cable, 2.8m diameter

Suspended between two 3m wires 20m band about 1.8m above ground,the ends of the suspension wires have to be folded back and twisted or shortened for 15, 12 and 10m

The critical part on this type of antenna always remains the variable tuning capacitor which is located at the hot spot of the antenna, zone where the impedance is the highest and the developed voltage very important

The magnetic loop is an unusual antenna, as with all smaller than perfect antennas, it has some drawbacks and some benefits

Commercial and handcrafted probes similar to those shown are commonly used in EMC diagnostic work

Covered HF bands: 40m to 10m 5.5MHz-29.8MHz Max. power 10W tested with an Yaesu FT-450AT Remote tunable through the coax

This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception

For qrp operation with limited space

Multi turn wire loops are often used as low frequency receiving antennas, applications such as geophysical research, oil exploration and survivable

The losses increase the bandwidth, but increasing the bandwidth in this way is a total nonsense because the efficiency decreases, it is better to increase the diameter of the loop or the thickness of the loop of the loop

I have found that a small receive-only loop antenna can be used to make the situation much more tolerable

Loop antennae have been used from elf to uhf since the beginning of radiocommunications, at low frequencies, the main problem for loop antennae is to have enough sensitivity

This is the popular k9ay loop receiving antenna, the directional receiving antenna this system provides a cardioiddirectional pattern in four different direction