Posts

DIY Automatic Tune Magnetic Loop Antenna By GM4WZG

DIY Automatic Tune Magnetic Loop Antenna By GM4WZG

DIY Automatic Tune Magnetic Loop Antenna By GM4WZG

DIY Automatic Tune Magnetic Loop Antenna By GM4WZG

The Small Do It Yourself Automatic Tune Magnetic Loop Antenna that he made is only 1 meter in diameter yet it has more or less the performance of a full size dipole – and has an amazing control box.  

Magnetic Loops are easy in concept but like many things, you can either make a super-deluxe version with automatic controllers or just keep it simple.

The version presented here is portable, and has a fully automatic tuning system that links to the CAT port of an FT-817.

A single press of a button initiates a tuning sequence and that’s all that is needed to get this antenna on frequency.

For an antenna that is one meter across, standing 1.5 meters above ground this is a formidable result. You’re going to be 2 s-points down on a doublet/dipole on 40m but if you’re operating from a hotel balcony, portable in the countryside or just at home where normal antennas are not allowed, it is not just a compromise antenna, it is a real antenna.

Check out the full story at http://www.gm4wzg.co.uk/antennas.html

/2 Comments/by

ML-91 Magnetic Loop Antenna

This is the ML-91 HF Magnetic Loop Mobile Antenna. I had shot this footage using my mobile phone Nokia E71, that is why the quality is not good but just OK, …

DD7LP, Christian Petersen zeigt eine Mehrband Kurzwellen Vertikalantenne im Eigenbau und im Betrieb Eine ideale Urlaubsantenne mit wenig Platzbedarf. Hier ma…
Video Rating: 4 / 5

/20 Comments/by

PY1AHD Handheld Magnetic Loop Controller for a HF Light Backpack Magnetic Loop Antenna

You can see on this video my new created device after four years work in designing several remote control systems to tune the variable capacitor of a Small Magnetic Loop Antenna. The antenna can be carried on my back, with a light and simple Back Support described on my web page, or I can temporarily fix the antenna on a balcony or window adjusting the antenna”s resonating frequency from a distant place.

This is both part 1 & 2 of explaining how I constructed my Ham Radio “To Go” box en ligne casino france so KEEP WATCHING AFTER it says THE END. For Portable use both in house and if needed emergency, field day, etc. I plan to use the anderson strip to power my Elecraft KX3 when it arrives to! Will attached KX3 with a bit of velcro or once I get KX3 will see if another way. I have room over my 857 or will change 2 meter mobile to a smaller one(I have a FT-1500 which is smaller)
Video Rating: 4 / 5

/36 Comments/by

Testing a coaxial cable HF magnetic loop antenna

Testing a lightweight HF magnetic loop antenna made from 7 metres of RG58 coaxial cable. Contacts were made on 40 and 20 metres during the Lighthouse Weekend. It uses just three main parts: the coax itself, an air-spaced variable capacitor (approx 50 – 100pF max) and a T50-43 ferrite toroid. The toroid is threaded over the coaxial cable. RF from the transceiver is fed via a 2 or 3 turn winding over the toroid (experiment with this for lowest SWR). The coax inner is left unconnected; only the braid is used here. The loop is for low power use only – it will take 10 – 20 watts before the variable capacitor arcs over. Performance is, as expected, somewhere between a smaller pedestrian mobile magnetic loop and a full sized wire antenna. It would be improved if the variable capacitor was a low loss type and the coaxial cable was soldered straight to it. While there’s enough information above to make your own, it’s worth checking out G4FON’s website ( www.g4fon.net ) for similar loops. My loop is closest to his Version 2.
Video Rating: 5 / 5

/7 Comments/by

This Week in Radio Tech, TWiRT, with Randy K7AGE, from NAB 2012

While at NAB in Las Vegas April 2012 I had a chance to sit down with Kirk Harnack, host of This Week in Radio Tech on the TWiT.tv network and have a chat. We just chatted about ham radio, Kirk’s learning PSK-31, my Youtube video background and a bit about networking. Fun time, with absolutely no pre-planning! You may watch the entire show at; twit.tv Also, please watch Ham Nation with Bob Heil K9EID, Gordon West WB6NOA, and George Thomas W5GDX at: twit.tv
Video Rating: 5 / 5

Demo of LD-1B software-defined radio (SDR) hardware with Winrad SDR software. This was recorded around sunset (5:55 PM) local time, 22:55 UTC on 29 December 2010. The antenna was an MFJ Super Hi-Q Loop which tunes 7 MHz – 21 MHZ. The antenna is horizontally mounted at about 25 feet above ground. The soundcard was an E-Mu 0202 sampling at 192 kHz. The demo begins on 20 meters, with the LO set to 14.0625 MHz and the receiver tuned to some PSK-31 signals around 14.07 MHz. Next, some CW signals, first using the SSB filter followed by the CW filter. The display is zoomed in to facilitate tuning with the narrow filter. Back to the SSB filter, and the LO is shifted into the 20 Meter phone band. Next, the AM filter, and WWV at 15 MHz. Next, 40 meter CW, first using the SSB filter, then demonstrating the CW filter’s capability to separate weak signals from nearby strong signals. Finally, a little shortwave broadcast listening in the “tropical band” This is outside the tuning range of the antenna, so signal levels are somewhat lower than one might expect. For more information about the LD-1B, go to www.lazydogengineering.com To order an LD-1B, got to shop.lazydogengineering.com The fluctuations in signal level and some of the buzzing and clicking sounds that are heard intermittently are due to retuning the magnetic loop antenna when the LO frequency is shifted. Thanks for watching my videos, and be sure to visit http 73, Pete Goodmann, PE, MSEE, NI9N www.lazydogengineering.com www …

/20 Comments/by