digital radio

Status
Not open for further replies.
A

andrew8485

New Member
hello i have been learning about basic fm radio (complacated) and need some one to point me into the right direction, i want to find some info on how the newer radios work, the ones that when you push a button it scans thew the freuencys or to a memory frequency i tried to do a search but no luck on that topic. i know i can to it with a rotation know hooked on a var cap but how do i so it like new radios ,with the push of a buttion, can some one lead me in the right direction with a search idea thanks a mill
 

They work by using a 'varicap diode', this is a device whose capacitance varies as it's reverse bias changes - actually most rectifier diodes do this fairly well. There are then basically two ways of searching, you can use a slow analogue ramp to scan the tuning, or you can do it digitally within a PLL (Phase Locked Loop) - where the software would sequentially increase the frequency in the correct steps.
 
Thank you all for replying now i can do more research with the info you gave me. these are the reasons why message boards are just as important as search engines thanks
 
i just got around to looking these topics up and it apears that i need to use programing to do this. does any one have a scamatic of a nice radio. there is accually not alot of tutorials on the web thanks
 
Status
Not open for further replies.

Similar threads

  • Question
Accurate 5-digit digital ammeter module
Replies
6
Views
667
electronium
F
Digital Caliper – A Curious Thing
Replies
2
Views
1K
For The Popcorn
F
  • Question
Is it possible to make a gate level digital wrist watch
2 3
Replies
56
Views
5K
Fluffyboii
  • Question
High frequency voltage measurement with digital multimeter
Replies
15
Views
3K
electronium
E
  • Question
Digital voltmeter error
2
Replies
27
Views
4K
el34man
E
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…