Hello,

If you want to read more about mixers, read the attached PDF's.

Bertus

thank you very much Bertus.....
i am reading one book, and in the book say, that mixer is product/detector, where is two input and one output, if output audio frequency, is this correct?

 

A Ring Modulator is for a Ssb transmitter, where you only transmit a carrier when you speak, or send audio, this reduces the power requirements of the rf amplifier ,and reduces the bandwidth of the signal.

The output of the Ring Modulator has two products, the Sum and the Difference of the two frequencies being converted, these are the Upper and Lower sidebands, only one sideband is transmitted , so in theory two signals can occupy the same frequency and won't interfere with each other.

In the receiver the same circuit is used and an oscillator called a BFO is used to reproduce the original Audio signal.

You need to search and study SSB radio receiver circuits further.

Hi
i am reading one book, and in the book say, that mixer is product/detector, where is two input and one output, if output audio frequency, is this correct?

 

Hello,

The product detector’s job is to convert an incoming signal from RF frequencies to
audio frequencies. It is simply another mixer whose output is in the audio
frequency range.

Read the attached PDF.

Bertus

 

Where do you live? How old are you? What is your electronic background?

What book are you reading?

If I give you 2 numbers.......say 22 and 20. What are the sum and difference of those two numbers?

What are the sum and difference of 4.001 MHz and 4 MHz?

 

Hello,

Read the attached PDF.

Bertus

Hello, it is very nice lesson…..
Thanks Bertus

 

Where do you live? How old are you? What is your electronic background?

What book are you reading?

If I give you 2 numbers.......say 22 and 20. What are the sum and difference of those two numbers?

What are the sum and difference of 4.001 MHz and 4 MHz?

sum 8.001, diferrence .001Mhz

 

Ok....those are your outputs from the mixer.

 

Hello,

sum 8.001, diferrence .001Mhz

So what would be the output signal when it is filtered by a lowpass filter?

Bertus

 

Hello,

An other interesting design for you could be the Direct Conversion Receiver:
https://en.wikipedia.org/wiki/Direct-conversion_receiver
http://www.microwavejournal.com/articles/3226-on-the-direct-conversion-receiver-a-tutorial

Bertus

 

Ok....those are your outputs from the mixer.

Thanks man, now i start to understand, but do you know any animation, how it demolate , for example am fm i find enough, how they work detector, for example am(i see animation of graphics in internet, how come sinewave after diode, and demulated, after filter also for fm), but for ssb i cant find. do you have any idea where can i find? any animation of graphics how they look unmodulated and demulated...

 

Hello,


So what would be the output signal when it is filtered by a lowpass filter?

Bertus

Hi Bertus, to say the truth i still dont know, because i am focused in mudulation and demulaation, and this new for me SSB(because i thought he work like FM)

 

Hello,

An other interesting design for you could be the Direct Conversion Receiver:
https://en.wikipedia.org/wiki/Direct-conversion_receiver
http://www.microwavejournal.com/articles/3226-on-the-direct-conversion-receiver-a-tutorial

Bertus

Bertus i am read you article, thanks

 

If you want to study different types of modulation and really enjoy radio......pick up one of these.

https://www.amazon.com/gp/offer-lis...p_used_olp_sr?ie=UTF8&condition=used&qid=&sr=

 

If you want to study different types of modulation and really enjoy radio......pick up one of these.

https://www.amazon.com/gp/offer-lis...p_used_olp_sr?ie=UTF8&condition=used&qid=&sr=

you think arrl 2000?

 

Hello,

The EYE has a lot of books for download:
https://the-eye.eu/public/Books/Electronic Archive/
There are many RF related books among them.

Bertus

 

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

 

Hello,

The ARRL handbook is from the american ham club:
https://www.box73.de/product_info.php?products_id=3856
The RSGB handbook is from the english ham club:
https://www.box73.de/product_info.php?products_id=3821

Bertus

 

i wanna thank everyone for help. i understand now..thnx

 

Hello,

The EYE has a lot of books for download:
https://the-eye.eu/public/Books/Electronic Archive/
There are many RF related books among them.

Bertus

thanks Bertus, i see a lot of books nice ;-)

 

Hello,

The ARRL handbook is from the american ham club:
https://www.box73.de/product_info.php?products_id=3856
The RSGB handbook is from the english ham club:
https://www.box73.de/product_info.php?products_id=3821

Bertus

i have to buy one.....