Radio: Difference between revisions

Revision as of 15:45, 8 April 2010

Outputs a logic high and logic low. What is the best way to convert this to a co/sine wave (multiplex?)
What value are we looking for?

FM is most likely too high to create
AM radio (car stereo) is about right. Find a station you want to tune to. KFBK 1530?
AM is allowed +- 5kHz
96kHz of bandwidth (due to what the audio card can sample)
SI570 can create a number of frequencies

Switching Regulator
SI570, KN9YIG
Johnson counter
Jumper selectable band pass filter?
http://www.sdr-kits.net/USB/USB_Description.html
Softrock is taking up about 40mA, USB provides 100mA for USB2, and up to 500mA for a high-powered USB 2.0 bus.

Example 9.12, work through the math please
Can oscillators produce sine waves without needing a square wave? Do we need to have potentiometers instead of resistors to make sine waves not clip?

@@ Line 20: / Line 20: @@
 :*AM is allowed +- 5kHz
 :*96kHz of bandwidth (due to what the audio card can sample)
-*SI570 can create a number of frequencies
+:*SI570 can create a number of frequencies
@@ Line 29: / Line 29: @@
 :*Jumper selectable band pass filter?
 :*http://www.sdr-kits.net/USB/USB_Description.html
+:*Softrock is taking up about 40mA, USB provides 100mA for USB2, and up to 500mA for a high-powered USB 2.0 bus.
 *Book questions