Antenna loop portatile costruita nella Repubblica Ceca, adatta per il QRP da 3,5 a 28 MHz B PLUS TV a. s., Požárnická 140, 742 83 Klimkovice, Czech Republic phone: +420 556 420 360, fax: +420 556 420 301 e-mail: [email protected], http://www.btv.cz http://www.btv.cz/media/produkty/mla/mla-m/pdf/Manual_MLA_M_eng_rev2.pdf ANALISI della MLA-M Magnetic Loop Antenna – Multiband 3,5 a 28 MHz QRP http://air-radiorama.blogspot.com/2017/01/analisi-della-mla-m-magnetic-loop.html https://www.radioworld.co.uk/generate_product_pdf?product_id=1654063 https://www.radioworld.co.uk/search/products?query=loop+mla " Antenne LOOP" commerciali per BCL - SWL - OM http://air-radiorama.blogspot.it/2013/10/antenne-loop-commerciali-per-bcl-swl.html Antenne LOOP per SWL-BCL ,autocostruzione http://air-radiorama.blogspot.it/2015/01/antenne-loop-per-swl-bcl-autocostruzione.html
magnetic loops are a compromise antenna and performance will be down on a full size wire antenna particurlarly on lower hf bands this article compare this magnetic loop with a full sized wire antenna on 80 meters by vk3ye. Listed under the Antennas/Magnetic Loop category that is about Magnetic Loop antennas.
Having had great success with a loop made using LDF4-50 Heliax and the much smaller 24″ diameter bicycle wheel rim loop I decided to try making a larger loop that would work on the 17m, 20m a…
Last month I published the teaser video for the Ultimate Man Portable Magnetic Loop antenna build. The build utilises the DIY Magnetic Loop Starter Kit from Chamaleon Antenna. Well, its time to hav…
Many thanks to SWLing Post contributor, Dave Gahimer (K9ZCE) for the following guest post: Small Magnetic Loop Antenna with Broadband Amplifier for SDR Reception by Dave Gahimer (K9ZCE) Those with …
Magnetic Loop Controller for 4 Antennas: This project is for those ham amateurs who don't have a commercial one . It's easy to build with a soldering iron, a plastic case and a little knowledge of arduino. This controller doesn't have endstop limit capabilities. In case you'd prefer a mode…
Magnetic Loop Antennas for The Radio Operator with Limited Space pt.2 Home Made HIGH POWER Magnetic Loop by Popeye ...
I have long been intrigued by the magnetic loop antenna and have been reading widely on the Internet on the subject for some time. I also saw Tony VK3CAT’s AlexLoop and thought it would be fu…
Incuriosito dalla pubblicazione all'indirizzo : http://air-radiorama.blogspot.it/2016/12/mla-m-magnetic-loop-antenna-multiband.html e dai commenti , ho analizzato brevemente la situazione : Caratteristiche dichiarate dal costruttore : MLA Magnetic Loop Antenna MLA-M antenna is suitable for 8 HF bands : 3,5 MHz; 7 MHz; 10 MHz; 14 MHz; 18 MHz, 21 MHz, 24 MHz and 28 MHz. At indoor desktop antenna design is special tuning by two knobs without any problems and by use of two variable capacitors which works in similar way as standard Π unit. Perfect impedance optimization in 3,5 MHz - 28 MHz is achieved by OK2ER and B PLUS TV a.s. patented design. Technical specifications: Loop diameter: 62 cm Dimensions: 63 x 75 x 18 cm Weight: 2,6 kg Input impedance : 50 Ohm Input connector: PL Maximum input power (according to indoor use): 10 W Frequency range: 3,5 to 28 MHz SWR (tuned): 1:1 max 1:1,2 Circuito parziale : Diagramma SWR/Frequenza Commento N.1 : Ciao a tutti, Non mi piace tanto il sistema usato per l'alimentazione .. Non sono un esperto, ma ho sempre usato la tecnica della piccola spira di accoppiamento.. non vorrei in quel modo distruggere il Q di tutta l'antenna, caricandola troppo, nonostante il variabile in serie al centrale del coax (guardate le foto del pdf che c'e' nel sito, non lo schemino indicato da loro che non rispecchia la realta') . Qualche parere ?? 73 E AUGURI da ik1wvq Mauro Bernardetto Risposta : I diagrammi mostrano che non ci sono grossi problemi di antenna troppo smorzata . La banda passante e' abbastanza stretta ( 16 KHz ) ed il Q facilmente calcolabile con la formula : Q = Fo/Bo Dove Bo e' la banda passante dei due punti son SWR pari a 5.83 . Q = 3518/16 = 220 L'uso di una piccola capacita' in serie appesa sul lato caldo del loop e' uno dei tanti modi di accoppiamento suggeriti dai libri per i loop quantanche per i circuiti risonanti parallelo. Si forma un partitore capacitivo che fa passare da bassa impedenza ( lato connettore ) ad alta impedenza ( estremo del loop ) . Normalmente non si usa per problemi di isolamento e pericolosita' in TX . Ma qui siamo in RX o QRP . Semmai ci sono dei limiti fisici invalicabili sulla efficienza , relativi a qualsiasi antenna piccola rispetto alla lunghezza d'onda . Commento n.2 Non pubblicato se non qui perche' non c'e' Nome e Cognome . Quanti "Memento" dovro 'ancora pubblicare fintanto che non se ne ricevano piu' ...hi .... ? Ciao, il mio parere è che possedendola, posso dirti che funziona davvero, ottima per radioascolto e sistemi digitali ma anche per comunicazioni a bassa potenza qrp. Fabio IU8DAR ................................................................................................................................................................... Fabio , per farti perdonare , ci dici quanto l'hai pagata ? Buon acquisto o sperimentazione a tutti ! Claudio Re
Magnetic Loop Antenna Automated Tuner: Hello community - Dave here (radio callsign G7IYK), I am very pleased to publish details of my latest project which is a magnetic loop (ML) antenna automated tuner. Before we get deep into the project, I intend to outline what a magnetic loop anten…
I have long been intrigued by the magnetic loop antenna and have been reading widely on the Internet on the subject for some time. I also saw Tony VK3CAT’s AlexLoop and thought it would be fu…
The tutorial of a DIY magnetic loop antenna for the amateur radio band featuring a remote tuning system implemented on Arduino with a RC servo.
Magnetic Loop for the 2m band Materials and description The whole choice is copper. This loop is made of 50cm of 4mm "soft" tubing. The capacitor of two 1mm circular plates with about 3cm diameter torch-brazed to the loop conductor. The coupling loop is made of 1mm solid wire and held by a luster terminal. Tuning is done by bending the loop to in- or decrease the capacitor plate's distance. The whole thing is than strapped to a bar of plastics with a tiny whole in it's center of mass to be skewered to my fiberglass telescopic mast. Meanwhile I built a second magnetic loop for this band, made of an old used UHV (ultra high vacuum) ring gasket and a small tube capacitor. The gasket is made of 1mm copper with an outer diameter of 120mm and an inner diameter of 100mm. The capacitor is connected by screws and the coupling loop by a luster terminal screwed on the gasket. A photograph is taken, but not yet available, sri... The main concern with copper is, that it corrodes. Remember, skin effect... Some finish should be applied to protect the conductor's surface. Experience Such kind of omnidirectional antenna gives the possibility to be QRV with horizontal polarisation, as commonly used for the CW and SSB section of the 2m band. This actual design shows a 1.3:1 bandwidth of about 150kHz, centered to 144.200MHz. The SWR on the lower end of the CW section still allows transmitting. The aerial gave good results on the local rag chew at 144.350MHz (using 10W pep) with the clear advantage of the directional diagram of a "lying" magnetic loop. Do not believe people telling you that this kind of antenna does not work for higher frequencies. It will not make you QRV from the basement, but held up in the air, to the same hight you would lift a beam to, it performs really satisfatory. Photographs
The tutorial of a DIY magnetic loop antenna for the amateur radio band featuring a remote tuning system implemented on Arduino with a RC servo.
Last month I published the teaser video for the Ultimate Man Portable Magnetic Loop antenna build. The build utilises the DIY Magnetic Loop Starter Kit from Chamaleon Antenna. Well, its time to hav…
Antenna loop portatile costruita nella Repubblica Ceca, adatta per il QRP da 3,5 a 28 MHz B PLUS TV a. s., Požárnická 140, 742 83 Klimkovice, Czech Republic phone: +420 556 420 360, fax: +420 556 420 301 e-mail: [email protected], http://www.btv.cz http://www.btv.cz/media/produkty/mla/mla-m/pdf/Manual_MLA_M_eng_rev2.pdf ANALISI della MLA-M Magnetic Loop Antenna – Multiband 3,5 a 28 MHz QRP http://air-radiorama.blogspot.com/2017/01/analisi-della-mla-m-magnetic-loop.html https://www.radioworld.co.uk/generate_product_pdf?product_id=1654063 https://www.radioworld.co.uk/search/products?query=loop+mla " Antenne LOOP" commerciali per BCL - SWL - OM http://air-radiorama.blogspot.it/2013/10/antenne-loop-commerciali-per-bcl-swl.html Antenne LOOP per SWL-BCL ,autocostruzione http://air-radiorama.blogspot.it/2015/01/antenne-loop-per-swl-bcl-autocostruzione.html
Diese kleine Mini Magloop ist wirklich genial. Sie besteht im Endeffekt aus nur einem Drehko, einem Kondensator und einem Ringkern. Ich hatte erst einen 140-43 eingebaut. Den habe ich aber gegen einen gelben Amidon Eisenpulver Ringkern T106-6 ersetzt. Damit funktioniert es ganz gut. Mit dem zuschalt
I have long been intrigued by the magnetic loop antenna and have been reading widely on the Internet on the subject for some time. I also saw Tony VK3CAT’s AlexLoop and thought it would be fu…
Magnetic Loop Antenna Automated Tuner: Hello community - Dave here (radio callsign G7IYK), I am very pleased to publish details of my latest project which is a magnetic loop (ML) antenna automated tuner. Before we get deep into the project, I intend to outline what a magnetic loop anten…
Last month I published the teaser video for the Ultimate Man Portable Magnetic Loop antenna build. The build utilises the DIY Magnetic Loop Starter Kit from Chamaleon Antenna. Well, its time to hav…
I have long been intrigued by the magnetic loop antenna and have been reading widely on the Internet on the subject for some time. I also saw Tony VK3CAT’s AlexLoop and thought it would be fu…
The tutorial of a DIY magnetic loop antenna for the amateur radio band featuring a remote tuning system implemented on Arduino with a RC servo.
I have long been intrigued by the magnetic loop antenna and have been reading widely on the Internet on the subject for some time. I also saw Tony VK3CAT’s AlexLoop and thought it would be fu…
Haunted as many others by radio interference and noise I started looking for a wideband portable antenna . Soon I became focused on a magnetic loop antenna. The only catch was the method of feeding by a Faraday loop , it made the project hand sensitive …. In the Rothammel Antennabook I found a complete different way of feeding made by capacitors . This was a big improvement and made a perfect match possible between 6.5 and 30 MHz. Both tuning capacitors come from old AM radios and because their sections are switched in series , they can be used up to 30 Watts without arcing. They interact so it’s wise to make some markings on the front for fast tuning. The loop is made of RG-213 coax and rests on a cross made of 6 mm. fibreglass rods( kite shop ) Inside the tuner is a shortcut between the centre and the braid of the coax loop to form a solid ring . By simply adding a second loop with a 5 cm.spacing and a switch to put the loop's in parallel or in series, the antenna becomes a 80-10 m. portable low power loop for travelling. The travelloop was born HI. It has been my travel companion for many years with many qso’s even far over the Atlantic. Tuning capacitors : http://www.rfparts.com/capacitors/capacitors-antennaload.html GG8ODE added a smart tuning indicator , ideal for home made rigs without swr meter : https://rsars.files.wordpress.com/2013/01/qrp-loop-tuner-80-20m-g8ode-iss-1-32.pdf 6.5-30 MHz TRAVEL LOOP 6.5- 30MHz tuner 3.5- 30 MHz VERSION WITH BANDSWITCH THE SWITCH SHOWN FROM BEHIND CAUTION ! Magnetic loop antennas can produce a high voltage that may be harmfull to your health. Tune your antenna at low power and take a safe distance while operating .
Haunted as many others by radio interference and noise I started looking for a wideband portable antenna . Soon I became focused on a magnetic loop antenna. The only catch was the method of feeding by a Faraday loop , it made the project hand sensitive …. In the Rothammel Antennabook I found a complete different way of feeding made by capacitors . This was a big improvement and made a perfect match possible between 6.5 and 30 MHz. Both tuning capacitors come from old AM radios and because their sections are switched in series , they can be used up to 30 Watts without arcing. They interact so it’s wise to make some markings on the front for fast tuning. The loop is made of RG-213 coax and rests on a cross made of 6 mm. fibreglass rods( kite shop ) Inside the tuner is a shortcut between the centre and the braid of the coax loop to form a solid ring . By simply adding a second loop with a 5 cm.spacing and a switch to put the loop's in parallel or in series, the antenna becomes a 80-10 m. portable low power loop for travelling. The travelloop was born HI. It has been my travel companion for many years with many qso’s even far over the Atlantic. Tuning capacitors : http://www.rfparts.com/capacitors/capacitors-antennaload.html GG8ODE added a smart tuning indicator , ideal for home made rigs without swr meter : https://rsars.files.wordpress.com/2013/01/qrp-loop-tuner-80-20m-g8ode-iss-1-32.pdf 6.5-30 MHz TRAVEL LOOP 6.5- 30MHz tuner 3.5- 30 MHz VERSION WITH BANDSWITCH THE SWITCH SHOWN FROM BEHIND CAUTION ! Magnetic loop antennas can produce a high voltage that may be harmfull to your health. Tune your antenna at low power and take a safe distance while operating .
Having had great success with a loop made using LDF4-50 Heliax and the much smaller 24″ diameter bicycle wheel rim loop I decided to try making a larger loop that would work on the 17m, 20m a…
Magnetic Loop Antenna Automated Tuner: Hello community - Dave here (radio callsign G7IYK), I am very pleased to publish details of my latest project which is a magnetic loop (ML) antenna automated tuner. Before we get deep into the project, I intend to outline what a magnetic loop anten…
Last month I published the teaser video for the Ultimate Man Portable Magnetic Loop antenna build. The build utilises the DIY Magnetic Loop Starter Kit from Chamaleon Antenna. Well, its time to hav…
The tutorial of a DIY magnetic loop antenna for the amateur radio band featuring a remote tuning system implemented on Arduino with a RC servo.
Hi, Jerry here, I hope you enjoy seeing what I'm up to. Stop by often, as I am constantly updating my galleries.
This is part 2 of my series on building a cheap loop antenna. If you haven’t read part one, it’s here. In this second part, I’ll cover the building of the tuning capacitor. Obliga…
