Radio hack

His recent video shows how to put up a workable basic HF antenna in a small backyard. The center of the system is a unun. An unun is like a balun, but while a balun goes from balanced line to an unbalanced antenna, the unun has both sides unbalanced. You can see his explanation in the video below.

The lower the frequency of radio transmission, the more antenna that will be needed in general. You can see the project in the video below. The antenna looks a lot like a magnetic loop antenna.

The one in the video has seven loops forming a mm square. The loop is, of course, an inductor and by removing some insulation, the operator can clip a lead at different points to control the inductance.

A variable capacitor resonates the antenna, so there is definitely tuning required. But if you do need a refresher as to what kind of SDR hardware and software should be in your bag of tricks, then this fantastically detailed account from [RK] about how he hacked his La Crosse WSU-IT weather station is a perfect example. In his write-up, [RK] walks the reader through every step required to find, capture, and eventually decode the transmissions coming from a TX29U wireless temperature sensor.

In the end, [RK] is not only able to receive the data coming from the wireless sensors, but he can transmit his own spoofed data that the weather station accepts as legitimate.

Getting there took some extra effort, as he had to figure out the proper CRC algorithm being used. But as luck would have it, he found a Hackaday article from a couple years back that talked about doing exactly that , which help put him on the right path.

Check out the video below for a demonstration of this particular piece of radio prestidigitation. Contactless payment by means of NFC-enabled bank cards has made our everyday transactions far more convenient over the last decade, but there still remains the tedious task of finding the card and waving it over the reader. Maybe embedded chips are a step too far for many of us, but how about a bank card in a wearable such as a ring? The chip in a bank card comes mounted on a small thin PCB with contacts on one side and a coil on the other that serves as its antenna.

After taking us through the removal of the chip from the card with some acetone, he proceeds to create a replacement for the card antenna by winding a wire coil round the ring. This becomes a trial-and-error process, but in the end, the result is a working NFC payment ring.

We quite like this idea, but would be tempted to both take away some of the trial and error with a vector network analyzer, and run a couple of turns of the wire as a closer coupling coil for the chip. The radio is a clone of a German project and provides a low-power radio with a rechargeable battery.

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