how to design am transmitter

[vead]

hi

i want to know how to decide which one circuit is use for am transmitter

i know to create transmitter circuit we require modulator,amplifier and oscillator
there are different circuit like ring modulator balanced modulator
but i don't know which modulator ,which oscillator is use for am transmitter

thanks

 

[demetal]

Hi,
The choice of the oscillator depends on the purpose, range and frequency of transmission... In most cases balanced modulator is being used...

 

[chuckey]

A balanced modulator has no carrier at the output, this is not what we want with an AM transmitter. The simplest modulator that is suitable for an AM transmission is a high level modulator. This is where the modulator alters the current flowing in the RF power output device. Its disadvantage is that it requires a power equal to half the power amps rating, but for low power its cheap and rugged with low distortion.
Frank

 

[thebadtall]

You may want to build a Real AM transmitter, using valves and high voltage.
If you're interested Ive got working schematics for 800w 1kw and 2kw

 

[tpetar]

Tutorial
https://www.mikroe.com/old/books/rrbook/chapter2/chapter2.htm


Simple AM Transmitter

**broken link removed**

 

[goldsmith]

Dear vead
Hi
It is pretty simple but depends on how much power do you need in your out put ? if you tell me a bit more explanations i can help you as well .
Best Wishes
Goldsmith

 

[Ogu Reginald]

To build a good transmitter, taqke the following steps:
Build an audio pre-Amp,
An oscillator circuit a crystal oscillator arrangement is desirable because of its improved stability,
A mixer.
Precautions are:
Make sure that the tracks of the vero-board are reduced to the minimal length where possible.In fact a PCB should be used for all frequency dependent circuit.

 

[chuckey]

thebadtall, proper tubes like 813s, 807s or poofy little line output bottles?
Frank