AMPLITUDE MODULATION HIGH FIDELITY

The Output of an AM Transmitter with 100% Modulation

 This site was started to promote AM transmission on the Broadcast Band.
It has been extended to cover other interests - vacuum tube design and early recording equipment

AMPLITUDE MODULATION

  The properties of both AM and FM are developed both intuitively and mathematically in the introduction.
The design of a solid state AM tuner with a maximum bandwidth of about 38KHz. and neglgible distortion is described in detail.
A low power vacuum tube transmitter with matching characteristics is also described.
A regenerative receiver employing 2 volt filament tubes rounds out the section on AM receivers.
A sample of audio from both receivers is included.

DESIGN of VACUUM TUBE EQUIPMENT

  The design of vacuum tube equipment is rapidly becoming a lost art.
The detailed design of the following vacuum tube equipment is included:-
 [1] A push-pull 6L6 audio amplifier
 [2] A push-pull 6V6 audio amplifier
 [3] A high performance low power AM transmitter
 [4] A two tube regenerative receiver
 [5] An Australian radio receiver from the forties.
 [6] A high performance Voltage Regulator

ACOUSTIC and EARLY ELECTRICAL RECORDERS

  The detailed design of the following equipment is discussed:-
 [1] Edison Vertical [ Hilland Dale ] Recorders
 [2] Vertical Recorders with Negative Feedback
 [3] Henry Harrison's 1926 Recorder
 [4] The WE4A Reproducer
 [5] Audio tracks are included to illustrate the above.

INTRODUCTION


HIGH PERFORMANCE AM TUNER


LOW POWER AM TRANSMITTER


REGENERATIVE RECEIVER


6V6 PUSH-PULL AMPLIFIER


6L6 PUSH-PULL AMPLIFIER


WE4A WESTERN ELECTRIC PICKUP


EDISON VERTICAL [HILL and DALE]

ACOUSTIC RECORDING


AIRZONE VACUUM TUBE RECEIVER


HIGH PERFORMANCE VOLTAGE REGULATOR


ERRORS and QUESTIONS

CONTACT



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