The modulator is at a set frequency, what crystals would be best for it's use? Any dimensions of the crystal would be great!
2007-03-22 13:21:29 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
You wouldn't use a crystal for an amplitude modulator. The classic circuit is an audio transformer in series with the power supply line to the plate and screen grid of the final power amplifier tube.
2007-03-22 20:15:33 · answer #1 · answered by Frank N 7 · 0⤊ 0⤋
Amplitude modulators are for putting voice, or some some other type of intelligence onto a carrier wave. The old way is to use, as stated, a transformer in the plate lead of a transmitting tube. A much better way is to mix it into the carrier wave, as an amplitude modulating source close to the primary oscillator. The problem there is that the rest of the stages have to be linear.
Crystal dimensions are measured in thousandths of an inch, and require special tools to do the work. I wouldn't even attempt it, unless I wanted the most powerful level of frustration I could ever hope to attain. FYI, crystals are made from quartz. Yep, we make a rock vibrate to get a radio frequency out of it.
2007-03-22 22:04:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋