Victor X-Ray Juliet Info
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Designer, technology enthusiast and licensed radio amateur, operating under the callsign MM7VXJ. 

This site serves as a record of my experimentation with radio telegraphy, electronics and other related projects.

I also create CGI animation as silico.studio and my 3D prints are avalable to purchase from physis.shop

Radios   
    Yaseu FT-857     Yaesu FT-818      Yaseu FT-4X        LilyGo T-Echo     Heltec LoRa32     RTL-SDR       Hack-RF        T1000-E  
Antennas                      Diamond VX30N [2m,70cm]                        DIY V-Dipole [137 MHz]                        Parabolic [1.7GHz]                        DIY Random Wire [14 MHz]                    
           
29th July 2021
Building a VHF Dipole
144.000 MHz (2m)
RTL-SDR

 After experimenting with the antennas that ship with the RTL-SDR I wanted to build an antenna explicitly for the 2m amateur bands which are between 144.000 and 146.000 megahertz in the UK.

I calculated that each ‘leg’ of the dipole should be 49cm in length to give good coverage at 145.000 MHz. I connected the dipole to a length of 50 Ohm coax cable and tied everything else together, clamping the antenna to a fig tree trellis. 

I later realised that this antenna is ‘un-balanced’ as it has no balun to correct the impedance of the coax and the antenna itself, but for a first attempt at making a antenna the results were workable.