Motorcycle wheel alignment tool
If you ride a motorcycle you should probably get one of the alignment tools to be sure your rear wheel is parallel to the road. Here I propose an affordable…
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23 December 2021
Yaesu FT-290 / FT-690 / FT-790 OLED replacement screen. Installation guide
If you have ordered the OLED screen you may need this little guide to install it inside your favorite rig. In this guide FT-290 is taken as an example, for…
20 December 2021
Yaesu FT-290 / FT-690 / FT-790 OLED replacement screen
Related posts: Installation guide Yaesu FT290 yet a very good ham radio rig suffers from a leaky screen which is a natural phenomenon touching soon or late every transceiver of…
7 November 2021
Wideband noise source v1 DC-100 MHz
tags: noise source, zener For measuring the noise figure of amplifiers in a 50 ohm system, noise source which generate Gaussian RF white noise are often used. Here I present…
17 January 2021
Wideband noise source v2 DC-200 MHz
tags: noise source, zener, BFR93A Some modifications of the broadband noise source presented previously. This second version is based on a two-stage amplifier, with the same BFR93A transistors. The difference…
17 January 2021
Portable antenna at 5 euros for the 2 meter band (144-146 MHz)
tags: VHF portable antenna, DIY antenna, cheap antenna Here I present a portable Yagi type antenna for the 2 m band, i.e. 144-146 MHz. This is very easy to do,…
17 January 2021
Baofeng UV5R Comparison of the original antenna with a counterfeit on the NA-771
fig.1 tags: Baofeng UV-5R, NA-771 Nagoya, comparison Here I am comparing the SWR of the original antenna with that of the obviously counterfeit Nagoya NA-771 antenna.As can be seen in…
17 January 2021
Balun 1:9 for a long wire antenna, operating between 3 and 50 MHz
tags: balun, long wire antenna Here I show my realization of a 1: 9 "BalUn" (actually a UnUn) for the 3-50 MHz band based on two FT114-61 toroids. The use…
17 January 2021
Yagi antenna for the 70 cm band (430-440 MHz)
tags: yagi antenna, 70 cm, cheap, simpleThis Yagi antenna that I present here was developed with the aim of capturing signals between 430 and 440 MHz from amateur radio satellites.…
9 January 2021
UV-5R sensitivity and squelch
Measured sensitivity of a UV-5R is made as follows: an LF signal of frequency 1 kHz is FM modulated over a width of 10 kHz and sent to the input…
9 January 2021