This 4th version of the QRP UltraLight MLA antenna has the same foldable construction designed for easy carry in a common laptop bag same as the 3rd version. This antenna was designed primarily for 40m to 12m bands + CB. Diameter of the main loop growed to 1mand same hight as the ver.3. I have used a wider PVC tubing of foldable boom. All this changes caused higher efficiency on all bands, especially on 40M band which was missing in the 3th version of UltraLight MLA. By using this same variable capacitor I was not able to reach the 10M band. Capacitor is connected in serial fashion because of very low resistance in a whole antenna circuit what is very important to secure a high Q and highefficiencyof my loops. I decided to do made 4th ver. because of longlasting poor propagations on higher bands due to a deep Solar minimum in the present years.
The tuning box is made of the solid plastic. For SWR measuring I have used the QRP transceiver XIEGU X5105. The SWR on all bands is better than. 1:1.5
This v. 4 MLA is working from 7MHz to 27,8MHz continuisly and CB band is covered too.
This is the best solution for HAM’s or listeners (SWL’s) who do not have an access to a large space for use a big or long wire antenna. This loop doesn’t need any grounding or counterpoise and work properly also from a very low altitudes. There are many types of this antennas – for 1kW, 100W or QRP power. One of most critical part of this antenna is variable capacitor and the space between it’s plates – bigger space – more power – bigger capacitor – bigger and heavier antenna itself but still good to use as the base antenna.
I like hiking, portable or SOTA activities and I needed a small, lightweight (about 960g), compact antenna and easy carryable in a small bag. So I begun to made the UltraLight Magnetic Loops which are completely foldable and very easy to assemble to a fully functional antenna shape just in a 2 minutes! This antenna has also an adapter to mount it on any standard alluminium fishing tripod stand.