Instructions for Building a Portable Double Cross Antenna: Great for NOAA/Meteor Weather Satellites

Over on Reddit user merg_flerg has uploaded an imgur post that carefully details a step by step guide for building a double cross antenna. A double cross antenna is great for reception of satellites like NOAA and Meteor since it has a sky oriented radiation pattern with very few nulls. This means that it can receive satellite signals coming from the sky well. Alternative antennas for NOAA/Meteor include turnstiles and QFH antennas, although the double cross antenna seems to have the least nulls, meaning that the signal is less likely to fade in and out as the satellite moves across the sky.

merg_flerg’s design is also modified from the standard design slightly, allowing it to become easily disassembled and carried within a backpack. At the end of his tutorial he writes that he gets much better reception with his double cross antenna than he does with his QFH.

In the post he demonstrates the final constructed antenna decoding a NOAA APT weather satellite image with an RTL-SDR and the WXtoIMG software. See our tutorial for information on decoding NOAA weather satellite images.

The finished double cross antenna connected to a PC running an RTL-SDR and WXtoIMG.
The finished double cross antenna connected to a PC running an RTL-SDR and WXtoIMG.

6 comments

  1. Johnathan

    I built this antenna, it works like a champ. I used a little bit of a different method using 3d printed parts, but I used the same specs and I get great signal. I think what a lot of people are having problem with is that they aren’t using 50 ohm cable. Using 75 ohm Coax (TV Cable) Won’t give you a great signal.

  2. Don DeGregori

    It’s interesting to see 3 negative reports so soon! Maybe they have made mistakes in it’s construction or use?

  3. DE8MSH

    Hi merg_flerg!

    What does ‘better than old qfh’ mean? Has it a lower elevation performance? Or do you mean stronger signal power? Let us know :).

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