DKARS MAGAZINE

New hamgear and gadgets (2/4)Seen on www.Kickstarter.comRF Breakout Kit for the Raspberry PiVarious contributionsZelfbouw 100 Watt VHF eindtrap voor $38,12Op Aliexpress.com wordt een VHF eindtrap als kit aangebodenvoor ongeveer 35 Euro. Even zelf in elkaar solderen, afregelenen je hebt voor een prikkie een 80-100 Watt eindtrap aan jeshack toegevoegd.De schakeling werk op 24 Volt en trekt bij maximale output circa6 Ampère. De gebruikte transistor is een MRF186 (XRF186), demaximale input is 3-4 Watt.About this projectWhat is it?An expansion board supplied as a self-assembly kit, designed forexperiments with the Raspberry Pi as a radio frequency sourceor radio transmitter using the programmable clock generatorbuilt into the Pi's processor.Who is it aimed at?This kit is aimed at radio amateurs and electronics experimenterswith an interest in radio.It has plenty of scope for interesting the Pi's primary audience ofyounger people in the world of electronics and radio by showingthem that a Pi can achieve long-distance communication andtalk to something in the real world rather than on a breadboard.BackgroundThe Raspberry Pi clock generator is a powerful frequency synthesiserwhich can generate frequencies up to 250MHz at thePi's 3.3v logic levels. This is enough to provide a useful RF signalsource for experimentation, or given suitable filtering and antennasto allow the Pi to be used as a low-power radio transmitterby users with an appropriate licence.The kit brings the clock generator as well as three GPIO lines andthe 3.3v supply to solderable headers on a PCB. It also providesa BNC socket for RF output, and a DC blocking capacitor to protectthe Pi processor from damage. A prototyping area is providedfor the construction of RF filters or transmitter controllogic.More info on this linkDKARS Magazine, editie 14 -39- augustus 2015