needed: simple radio schematics

[{ antonio }]

russian radio schematics

i am looking for simple radio schematics - everthing from airplane radio to cb radio to am radio to weather band. does anyone might have schematic that has all of these in one? heck i'll a schematic they are seperatedor individual as well. thanks in advance for any help. antonio.

 

[House_Cat]

There are many on the web. Here are a few:

http://www.discovercircuits.com/R/rec-circuits.htm
**broken link removed**
http://www.hanssummers.com/radio/simple/intro.htm

 

[vanko]

Here are some usefull projects.
Perhaps they can help you.

Best regards

 

[mhmd11]

circuit rc 2

 

[mohsen++]

you can use rf module and encoder and decoder ics like as pt2262 and pt2272 to send and receive max 6 command circuite is very simple

 

[majid_valentine]

you should too consider doppler effect in motion reciever!!!!it can was very dificult to desighn

 

[mohsen++]

ofcours doppler effect may be important when the speed of transmitter or receiver is very fast but in model airplane its no problem
we can calculate Δf
Δf=fv/c
for example f =433.92 MHz
c=3exp8 m/s
v=30 m/s=108 km/h
then Δf=433.92exp6*30/3exp8=43.392 Hz
in ppm its about 0.1 ppm
and freqency drift in ask mode and also deviation in fsk mode is very very bigger than this freqency shift

 

[majid_valentine]

can we use simle module for example rfm12 to this goal????

 

[mohsen++]

yes you can use rfm12 for data comunication but you need to initial it by a microcounroler before using
for transmitter and receiver frequency deviation rx bw and...
in otherwise rf power of rfm12 is very low (less than 10dbm) then you can not use it for long rang

 

[FvM]

you should too consider doppler effect in motion reciever!!!!it can was very dificult to desighn

Do you plan a radio on a spaceship?