AM Radio

425

05:36:44

AM Radio having a little truble trying to tun it I have put a 60ohms resister in for the speaker output. But cant quite work out what values for the inductor and capacitor to tune the arial... any ideas

published 12 years ago

UncleRick

12 years ago

Tune the tank for the frequency wanted and the antenna capacitor for best amplitude. That is If the RF source can be tuned to. You might try isolating the RF source with some high resistance, to allow the antennna cap to tune. If the source has too low of an impedance, you might not see any tuning effect from adjusting the antenna capacitor. Of course i could be wrong. P.S. The tank is the coil & capacitor in parallel.

pip

12 years ago

As unclerick said put 1meg in series with source and 6.26mh in parallel with 27pf for the tank is a good place to start.

thebugger

12 years ago

Its impossible to do without a modulated signal also the simulation speed is uncontrollable and uncorrect.check one of my circuits its called amplitude modulation ;)

thebugger

12 years ago

Incorrect :D

pip

12 years ago

Partly true, but to simulate the self resonance of the tank filter and follow it through to the output for testing' only a sine wave is needed the carrier is only required for transmission through the air not for if stage or demodulator.

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