panic mode

i would need to spend an hour to build it, then another hour to write instructable. i'm not oppsed to do it but for something i don't have use for, that is too much time so it will have to wait until i have nothing better to do. i was learning electronics as a kid, then learned more tech school and then at university. i've spent a LOT of time doing all kind of projects, many were RF (for me and my friends). at that time DIY was quite popular and it was not that hard to find knowledgeable person. today i don't see people making their own transmitters/receivers. i suggest starting with simple things like FM mike (2 transistors). this is very cheap, simple and good to practice with. you will be able to see what is really meant by keeping everything short etc. this will make difference between good and bad design. good will do easily 100m without antena. bad will strugle with 10m even if using antena. next step is to make something with more power. making stable oscillator is not trivial but for jammer for example, that is not needed. if you don't modulate the transmitter it will make "silence". this is ok for demo but to get real kick, it has to be modulated. to get harmonics (tons of frequencies) one should use non-sinusoidal signal. the steeper the edges, the more harmonics. simple square wave oscillator (NE555 or whatever) will do. good luck