02-26-2014, 02:26 PM
Morzh - I baked it because Mr. Ramirez and others said to. The bakelite absorbs moisture, and apparently it affects the circuit.
Thanks for the info. Is that BK generator capable of modulation?
My 'transmitter' is just a cobbled together circuit I built with spare parts on a breadboard. Basically a clock circuit generates the carrier with a crystal and dividers, that signal is modulated with an audio transformer, then sent through a pot to the gate of a power mosfet that switches 40-90v across a ferrite transformer. The output is tuned with a tank circuit and fed to 20 feet of wire on the ceiling. The antenna pulls about 4 watts when connected, but it's only audible for a quarter mile or so. Still enough rf to stop a trackpad from working
The signal is a fairly clean sine wave, hopefully enough so to use.
The AVC line measured at the end of the volume pot, correct? Or is it before the 2 meg resistor?
Thanks for the info. Is that BK generator capable of modulation?
My 'transmitter' is just a cobbled together circuit I built with spare parts on a breadboard. Basically a clock circuit generates the carrier with a crystal and dividers, that signal is modulated with an audio transformer, then sent through a pot to the gate of a power mosfet that switches 40-90v across a ferrite transformer. The output is tuned with a tank circuit and fed to 20 feet of wire on the ceiling. The antenna pulls about 4 watts when connected, but it's only audible for a quarter mile or so. Still enough rf to stop a trackpad from working
The signal is a fairly clean sine wave, hopefully enough so to use.
The AVC line measured at the end of the volume pot, correct? Or is it before the 2 meg resistor?
