UHF Transmitter/Receiver

[Kunjar]

hello,
im new here and its very nice community...

i wannt build UHF Transmitter and Receiver, for voice only...no video...
how much would its cost??
and there is schematic for build it?

and it can be digital that no one else can listen to this, but me??

thx.

 

[flatulent]

You can use serial ADC and DAC such as used in CD players. This will eliminate most listeners.

 

[Kunjar]

but what about the transmitter?
and how much would its costs all together??

 

[pranam77]

but what about the transmitter?
and how much would its costs all together??

If you are an average hobbyist, the UHF transmitter deisgn is not the job for you. Regarding costs, it depend on the design, and for the design, you may google it. Cheers

 

[Kunjar]

i just want to build a wireless microphone that no one can listen to it, but me...

and i thought that the best option is UHF Transmitter...

i dont know what to do...

 

[dz99]

Hi,

Check this out:

http://www.rf-kits.com/schematics/7413.jpg
http://www.electronics-lab.com/projects/rf/001/index.html
http://www.pira.cz/entx3.htm

Cheers!

 

[Kunjar]

this is for regular FM Transmitter
i need FM Transmitter that no one could listen to this, but me..

 

[dz99]

OK

Questions:
1. digital or analog modulations
2. pre bulit blocks (funcion ICs) or
3. you want to build it from the bottom part-by-part
4. is it okay to involve a PC into the comm link? (Software Defined Radio, less hardware)
5. What is your range requiment?

Anyway if you choose an irregular freq for your comm chanel noone will listen you...

Added after 11 minutes:

maybe this is what you need:
**broken link removed**

 

[pranam77]

i just want to build a wireless microphone that no one can listen to it, but me...and i thought that the best option is UHF Transmitter...i dont know what to do...

As already mentioned, UHF designs are a bit complicated in respect of frequesncy stability and other RF design principles to be followed. You may follow the links given in this thread, construct a FM Tx and tune it out of the FM band may be on 76Mhz or on 110Mhz and tune the receiver to the same frequency. May be this is the easiest what you can do for privacy...Cheers

 

[Kunjar]

but how can i change it to 76MHz if the fm tutorials are 88-107MHz..?

and i cant change the radio do 76 MHz its 88-107MHz, too...

 

[dz99]

but how can i change it to 76MHz if the fm tutorials are 88-107MHz..?

and i cant change the radio do 76 MHz its 88-107MHz, too...

Change the oscillator elements accrodingly...

 

[Kunjar]

sorry i didnt understand what you said...

 

[dz99]

sorry i didnt understand what you said...

If you are unexperienced with RF deisgn, maybe better (and cheaper) to buy this:
**broken link removed**

It has a built in encoder AKA scrambler: https://en.wikipedia.org/wiki/Scrambler