References

MLA-ER/30-10

To start evaluating this type of Magnetic Loop Antenna (MLA), we must first say that this is a „compromise antenna“. The fact is that we can get something by sacrificing something else.
The small size and an easy transportability, a nice mechanical design, simple assembly, easy mounting, this all would attract mainly mobile users. Making MLA-ER ready to operate is really easy and no skills are needed. Basic tuning (band switching) is quite easy by swapping capacitive segments. So far all sounds fine, but then...

To make any magnetic loop antenna operate at the peak of its theoretical performance (and not to have a nice technical artefact only), a MLA must (contrary to a piece of a wire that can operate always and anywhere) meet some additional physical conditions. Some are determined by a good technical design and technology used by the manufacturer, other conditions should be met by the user at the final location. The resonant-loop systém must be optimized (tuned), otherwise the promised and promoted features of the MLA-ER would never materialize. From my own experience I must say that using only a SWR meter to tune MLA-ER is bothersome, inaccurate and simply poor. A beginner would be certainly lost. I can confirm everyting what the author had written. The best for tuning is using an antenna analyzer, AA. Then the tuning can také less than a minute or a couple of minutes. A „professional“ may succeed even without an AA, but those are rare birds. They might know and require no instructions.

To conclude my evaluation of MLA-ER: This antenna is mainly suited for digital operations where it is not needed to tune over a larger frequency sector in a band. Certainly I would not recommend this antenna to beginners without an experience in antenna techniques. They can really be quite dismayed by a poor MLA tuning which is required to use all magnetic loop antennas.
Any tiny change in the vicinity like turning the loop by several degrees, or hanging wet laundry on a drying hanger close to the loop, can mistune the antenna. With an AA the problems are gone. The evaluated MLA-ER is a good and low-cost solution for many radio amateurs who cannot build their dream antenna. The MLA-ER can be also used in a situation which is not optimal, but this would be another story of thinking and using it.

73, Emil, OK5AG

I am using both MLA-M and MLA-T at a complex housing of a city. It is well known that most dwellers live in a restricted area here in overoccupied Tokyo. However, we do not want to give up operating with HF antennas at our veranda. So we must beg for small but efficient antennas, MLA-M and MLA-T. feel very happy to use MLA-T especially on top bands.

Aki Kogure, JG1UNE

Hello Olda,
I tested the MLA by skimmers on 30, 20, 17 and 15 meters. Evaluation: comparable reports to those with a LW, sometimes also better. As conditions were not good at 12 and 10 meters, I still have to try it there. Now I am installing 60m band in my ATS TRX, I would like to try the MLA also at my other QTH and on 60 m band.

Igor, OM3CUG

Hello Olda,
I have to say that MLA-C works quite well for me on 40 and 60 meters but on 80 meters I do not have a large number of qso’s on CW, maybe because of my geographical qth (I only have land to east or north east and south, Europe and Africa) or maybe because of the low SFI. Nevertheless, I am very happy with the antenna and for the price and for the shape of the antenna (we do not need to install a mast with guides, for instance) it deserves what I paid for it. Thanks, Olda.

David Quental, CT1DRB

Hallo Olda,
I examined it again and really I can only congratulate. With a completely invisible antenna in the room I can normally work on 80m. Tuning can be quickly drilled. Now I did on the first call and the EM7 G3 for 579 and 599 After my CQ also responded skimmers . All QSOs and test for skimmers was WKD on the my out 50W. I think, min. 3 db reserve to LP 100 W. So what can I say, good luck in JA and elsewhere. Super, my congratulation!!!

Jirka, OK2RZ

My QTH is on 9h floor in a 13-story building. My antenna sits on a chair near a window. I detected no change by locating it on my balcony. After a while of operating my station I became convinced that MLA is a genial invention of its kind. I normally believe only in things I can prove myself. Although I am an electronic engineer and a teacher at a high school of electronics, I do not trust too much antenna theories. First I want to try it, then I can evaluate it. My excitement of MLA-M was high and exceeded any expectation. The magnetic loop antenna is no chimaira but an excellent antenna, mostly suited for those having problems to locate suitable antennas on apartment blocks and similar situations.

Jozef, OM6TC

Magnetic loop represents totally different feeling of the air. Because of the nature of MLA, it uses primarily magnetic part of radio waves, performs with a very strictly defined directional effect and works as a frequency preselector. Thus, in compare with the common antennas, you can use those effects to almost eliminate the disturbing and jamming signals, focusing on the interesting weak ones. And you can use MLA for transmitting, too... The experience is great. I recommend it.

Karel, OK1UHU

Hello Olda,
In addition to the generally known reasons WHY a MLA, I would offer more comments on MLA-M. The matching is perfect! On all bands it literally sucks out all TCVR power out, even without the need to use an antenna tuner. Very great during thunderstorms- I can use it indoors during a storm, when it also rejects QRN. A good reference antenna: given my limited land area, I cannot build more antennas next to each other, switch them and compare by skimmers. Thanks to MLA I can use it as a reference while I build other antennas and test them one after another. MLA is good due to its good match at all bands, I cannot afford another larger one as a reference.

A joke to finish: our grandsons were excited with Star Gate series. So they connect an old notebook to my MLA and start entering „addresses“. After I hear „seventh symbol insterted“, I can see toys and fluffy bears flying through MLA rings as they „fly“ to other planets... So the MLA entered as an indivisible part of our interior and my life style... D

Milan, OK2BYW

Hello Olda,
I had an exciting QSO last night (23/07/2017, 0303 UTC) on 80 meters using the MLA-C. I worked RI1ANO in the South Shetland Islands of Antarctica on JT65. The distance and bearing from my location to that of RI1ANO is 12,288 km at 164 degrees. I have to admit that I’ve never thought such a thing to be possible for me on 80 meters and I’m still amazed by what happened.

What amazes me even further is that my MLA-C is on a north side balcony. It must be magic.
There are times that I wish for the MLA-C to work better than it does on 40 meters but I truly love the antenna on 60 and 80.

Very 73

Joe, AI0Y

Dr Olda. I use aerial MLA cca 1.5 years. In first I use tcvr from MFJ who had 5 W output. Now I have tcvr KX3. I live in town Plzen where is a big QRM and QSOs with that antenna were nothing much. But on my weekend house - that was very success !! I had QSO with 10 watts -stations from Arizona and also from Florida. MLA is beautiful antenna for QRP QSOs! 73 and MLA forever!

Vláďa, OK1IVU

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