RPi’ YU5R Rotator Software is for Remote Controlled the Antennas over the ethernet in the Resava Valley Contest Club YU5R, used the Rasberry Pi and Linux Operating System, Apache server and PHP. You can connect various antenna rotator controlers such as the Yaesu GS-232, LVB Tracker www.g6lvb.com/articles/lvbtracker/, Fox Delta ST2 – Satelte Tracking Interface www.foxdelta.com/products/st2-rs232.htm…
How do you know when the dipole is set at the right length for the band in use? Measure it of course…. (make the dipole out of 30m Aluminum tape measures). 5m + 5m = Half Wave on 20m. 10m + 10m = Half Wave on 40m. 20m + 20m = Half Wave on 80m…
Build your very own superheterodyne radio. Simple to follow instructions with schematics and wiring diagrams! You get a manual, all the parts including silk screened printed circuit board, 4 tubes, sockets, tuning capacitor, Aerial, Oscillator and IF coils, 4 inch speaker, resistors, capacitors, wire, nuts and bolts etc. Four Tube Superheterodyne Radio Kit (Limited Edition)…
This was finished months ago and just now I had time to finish the article. LM3916 is a dedicated IC for VU LED meter. Unlike LM3915 which have 3dB step between voltage levels, the LM3916 have nonlinear steps: -20, -10, -7, -5, -3, -1, 0, +1, +2, +3db, just like old school analog VU meters.…
This interface is galvanic isolation of the transceiver from PC computer. Audio input and output paths are separated by transformers; optocouplers serve to isolate the digital paths, PTT and CW KEY. It was built for Icom IC-718 but can be used for any other radio. Interface support PTT keying over RS232 RTS (pin 7) and…