ARRL puts out one every year. Least they use to. Pick any one you desire.

Thnx Man

 

You don't have to buy a new one. The radio principles remain the same.

 

Hello,

There are some ARRL books for download at the internet archive:
https://archive.org/search.php?query=electronics arrl handbook

Bertus

 

michael1978......here is a newer edition than I have.

https://www.pdf-archive.com/2017/05...rl-handbook-for-radio-communications-2011.pdf

 

Hello,

There are some ARRL books for download at the internet archive:
https://archive.org/search.php?query=electronics arrl handbook

Bertus

Thnx Bertus.....

 

michael1978......here is a newer edition than I have.

https://www.pdf-archive.com/2017/05...rl-handbook-for-radio-communications-2011.pdf

Thnx man is very good...…..thnx a lotttt

 

This new circuit is a 40 meters AM shortwave radio. It is not an 100MHz FM radio.

 

It is not a radio for voices or music, its output is a beep whenever there is a CW (carrier wave), like Morse code.
The beep tone is produced by the product detector difference between the radio carrier that is received and the BFO.

 

Hello,

On the HAM radio bands there are conversations between HAM's in SSB.
This can not be received with a normal AM receiver.
A product detector is able to detect the SSB signal.

If you want to to hear what happens on the short wave radio, you can listen online here:
http://websdr.ewi.utwente.nl:8901/

Bertus

 

Actually, that kind of mixer and a product detector are the same function, but used for different purposes, thus different names. Also called frequency converters by some folks. Sorry about getting into this thread late. Oh Well.

 

A "Beat Frequency Oscillator" is a special local oscillator.....purposely offset from carrier or IF. Hence the name beat. Meaning tone.

It can not be used to feed a product detector. If you feed a product detector with a BFO.....the product detector becomes a frequency converter. Mixing two different frequencies.

If you tune your BFO to the same carrier or IF......the BFO becomes a LO....local oscillator. Now the frequency converter reverts back into a product detector. Mixing two equal frequencies.

The math remains the same.......only the mixer and LO names are changed. The special names are a condition or circumstance.

The product detector can also detect frequency and phase shifts. FM detection.

 

Thanks Everyone...a nice wekend..

 

A "Beat Frequency Oscillator" is a special local oscillator.....purposely offset from carrier or IF. Hence the name beat. Meaning tone.

It can not be used to feed a product detector. If you feed a product detector with a BFO.....the product detector becomes a frequency converter. Mixing two different frequencies.

If you tune your BFO to the same carrier or IF......the BFO becomes a LO....local oscillator. Now the frequency converter reverts back into a product detector. Mixing two equal frequencies.

The math remains the same.......only the mixer and LO names are changed. The special names are a condition or circumstance.

The product detector can also detect frequency and phase shifts. FM detection.

In receivers used for CW (telegraph code) reception the BFO ALWAYS feeds the product detector and the result is an audio tone indication that the carrier is present. That is the only purpose of the BFO and product detector. The frequencies are not quite the same, usually about 700 Hz different. Thus the tone heard is that 700 Hz tone.
In a single sideband receiver the BFO is fed to the product detector to replace the supressed carrier, so as to uninvert the speech and make it understandable. For SSB reception the BFO frequency must be very close to the signal ferquency fed to the product detector.
For FM detection the BFO frequency should be the same as the other frequency, but 90 degrees out of phase, so that the difference is the audio frequency causing the change in signal frequency.

 

Hello,

Some time ago I posted this thread :
RF related links

Bertus

 

Hi, one more time me, i try to understand ssb, and i watch one video one YouTube, how they remove carrir frequnecy and lower side band, but
i dont understand, how the am signal looks in spectrum, til now i see only sine wave, how to say, how become signal in spectrum in sine wave?
when in spectrum they ary three sine, lower side carrier upper side, how come only one sinewave...…...

 

Hello,

Here are a couple of pages that will explain the use of SSB:
https://www.radio-electronics.com/i...modulation/single-sideband-ssb-modulation.php
https://w6bky.me/2009/08/16/single-sideband-a-tutorial/
http://www.hamuniverse.com/ssbinformation.html

Bertus

 

Hello,

Some time ago I posted this thread :
RF related links

Bertus

Hi Bertus i go to look, because als in arrl radio book, i see the same picture like you see now

 

Hello,

Here are a couple of pages that will explain the use of SSB:
https://www.radio-electronics.com/i...modulation/single-sideband-ssb-modulation.php
https://w6bky.me/2009/08/16/single-sideband-a-tutorial/
http://www.hamuniverse.com/ssbinformation.html

Bertus

Hi, i understand single band how is working, but for those all am fm ssb dsb, in spectrum analyzer, like don look, like normal, how they look for example am sine wave, fm sinewave,
for example you see the picture how does look figure am a, in #55, but in figure am b, in #55 they look only three lines, this three lines i dont understand this three line verical

 

Hello,

Picture (b) is an AM signal for one tone.
Picture (c) is an AM signal with a mixture of tones.

Bertus

 

Hello,

Picture (b) is an AM signal for one tone.
Picture (c) is an AM signal with a mixture of tones.

Bertus

Bertus, ahhh this signal for one tone, and he looks normal like one sinewave? right of maybe i am mistake?