I'm trying to make a tone transmitter that can transmit a tone at least one hundred feet in clear sight to any standard radio on a frequency where no one is broadcasting. I understand that the values in my tank circuit are a bit off, but once I am able to transmit to a radio, then I want to adjust the transmitting frequency.
I tried the first circuit. The enable connection point (of course marked enable) works perfectly, but the transmitting distance seems weak.
I'm thinking of doing the second circuit, but I don't want to waste a circuit board only to find out that it doesn't work.
So using only BJT (NPN or PNP) transistors for the RF portion, how should I arrange the parts for maximum transmission power without violating law? I think my limit is 1/4 watt, I'm not sure.
For initial tests, I'll use 9 VDC but in the end I'll use 5 VDC that's generated from a 7805 regulator that the 9V will feed into.
Should I go with the second circuit or would it function better if I changed how the parts are connected?