L band Antenna
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Author Andrei
05/08/2019
We have another cool post by SignalsEverywhere YouTube channel and you could see the full video here Satcom antennas used for L-Band reception from Inmarsat, Iridium and more with an RTL SDR Airspy and other Software-Defined Radios. A lot of these antennas are actually made for some commercial purpose like keeping ships connected to Inmarsat. In fact, the shipborne antenna has a nice motorized system for pointing the antenna that [SignalsEverywhere] is hoping to modify for his own purposes.

With what appears to be standard NEMA 17 steppers onboard, it should be relatively easy to supplant the original controller with an Arduino and CNC shield. Though considering the resale value these particular units seem to have on eBay, we might be inclined to just roll our own positioner.



The QHF antenna is another interesting teardown. The antenna makes a helix shape and looks like it would be interesting to build from scratch. There isn’t a lot of details about the antenna designs, but it is interesting to see the variety and range of antennas and how they appear internally.

L band is from 1 GHz to 2 GHz, so signals and antennas get very strange at these frequencies. The wavelength of a 2GHz signal is only 15cm, so small antennas can work quite well and are often as much mechanical designs as electrical. The L band contains everything from GPS to phone calls to ADS-B.


Feel free to watch the full video where he will be reviewing each antenna type L band that he is curently using for the day to day software find activity.

The first inmarsat SATLINK he shows as, I have to say that looks awesome and is quite briliant with the step motor control. The PCB is also quite well made.

Apart this post, if you have your own project and you need good quality PCBs, consider using the services of JLCPCB.com which will offer you quite good services, I use their services a lot of my PCBs.

Consider supporting ELECTRONOOBS on PATREEON.







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Blog#89 - L band Antenna

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