Difference between revisions of "Radio"

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*BPF:
+
*BPF
  +
:*LPF+HPF=BPF
 
:*What frequency range?
 
:*What frequency range?
:*How to implement?
+
:*How to implement? RL? RC? Do I need something more?
   
 
*Amplifier
 
*Amplifier
Line 9: Line 9:
 
:*What frequency range?
 
:*What frequency range?
 
:*How to implement?
 
:*How to implement?
 
  +
 
*Oscillator:
 
*Oscillator:
 
:*Outputs a logic high and logic low. What is the best way to convert this to a co/sine wave (multiplex?)
 
:*Outputs a logic high and logic low. What is the best way to convert this to a co/sine wave (multiplex?)
Line 17: Line 17:
 
:*FM is most likely too high to create
 
:*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 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)
 
:*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
  +
  +
  +
*Notes to organize:
  +
:*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.
  +
:*Pick a logic family and stick with it: CMOS?
  +
:*Quad Analog switch for the multiplexer (Sine/Cosine). 74(V)HC4066 is one of them
  +
:*The 74VHC4066 doesn't go high enough. We need to use a Frequency Mixer instead, http://yu1lm.qrpradio.com/HF-VHF%20SDR%20receiver-part1-YU1LM.pdf
  +
  +
*Book questions
  +
:*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?
  +
  +
*Class note questions
  +
:*What does LO stand for? Local Oscillator
  +
:*http://www.microwaves101.com/encyclopedia/mixerwaveforms.cfm

Latest revision as of 16:55, 8 April 2010

  • BPF
  • LPF+HPF=BPF
  • What frequency range?
  • How to implement? RL? RC? Do I need something more?
  • Amplifier
  • Do we need an amplifier? Is the incoming signal large enough?
  • LPF:
  • What frequency range?
  • How to implement?
  • Oscillator:
  • 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?
  • Frequency Range:
  • 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


  • Notes to organize:
  • Book questions
  • 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?
  • Class note questions