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Recent content by omid_safari

  1. O

    Using IAR with SAM-BA emulator to port my code

    Using IAR with SAM-BA - help needed problem is in startup file that iar attach befor main()
  2. O

    working with AT91SAM7S256 and using Iar embedded workbench

    hi i was tested with ewarm 5.41 and it don't work after restart and chip don't work after program by sam-ba. i trace source code and find out this problem is in startup code. this problem occured exactly after low_level_init and in asm command "b main".
  3. O

    how make a audio reverb with FFT?

    how make a audio reverb? hi how can i make a audio reverb with FFT? is it possible calcualte FFT for 1bit TTL audio sample?
  4. O

    a newbie like to made 20kByte/s data sender by atmega8/16

    i can't find another pll or synth i my city. please someone draw and give me a schematic for connect rf9901 & LMX2206 for the range they are match. i like make a digital solid state radio with few fixed channel. i know calculator-websites but for me it take some days for learn about plls and...
  5. O

    a newbie like to made 20kByte/s data sender by atmega8/16

    here i live, there is one law only : no laws! please tell me how can i connect a pll to RF9902. thanks Added after 6 minutes: if i find a pll ic ,then i must calculate and design a LPF for connect between them? can i connect them directly? Added after 30 minutes: hello guys, i found...
  6. O

    a newbie like to made 20kByte/s data sender by atmega8/16

    what about trasnsmitting to range 500meters. Added after 48 minutes: i found out RF9901-RF9902 now i need a pll for coonet to them.
  7. O

    a newbie like to made 20kByte/s data sender by atmega8/16

    thanks now, i know that must make a serial data tranfer radio. what about receiver type? how many stage for convert? superhet or direct coversion? another question is about carrier frequency. i like my radio work between walls,rooms. also i don't like use low frequency because long antenna is...
  8. O

    a newbie like to made 20kByte/s data sender by atmega8/16

    hi friends, i am try to learn RF and make a one-way data sender for my favorite microcontroller. i don't like use a rf module or any all-in-one chip. my challenge is at first for receiver part. here is my idea: transmitter: base is on a pll fm transmitter for carrier and 8 predefined reference...
  9. O

    I am newbie in rf - answer me Please

    i was had good experience about active filters with opamps in audio jobs,is it good solution for high frequency? is it better than ceramics?
  10. O

    I am newbie in rf - answer me Please

    thanks a lot betwixt,you make a new vision for me,i will try this method and i know that i can do it,but i have not any experience about new hi-speed low-cost technology,my best jobs on AVR and it can't handle this job.i can do it on next version surely. now i have 2 choice: 1-use radio ic...
  11. O

    I am newbie in rf - answer me Please

    but the ceramic filters are 10.7Mhz and 455Khz
  12. O

    I am newbie in rf - answer me Please

    hi sorry,i don't understand which part of this IC limit the bandidth to 5-8Khz?
  13. O

    I am newbie in rf - answer me Please

    MC3371 is good for high-quality audio?
  14. O

    I am newbie in rf - answer me Please

    i like make a wireless transceiver for business active bands. i need one stereo transmitter and 2 mono receiver for left and right channels. and i no like use 88-108Mhz. and this is a big problem because i can't use generic fm radio ics. at first i checked synthesizer & pll method but if i use...
  15. O

    I am newbie in rf - answer me Please

    may i use Am medulation for high quality stereo music in short range(max 500 meter)?? why everybody use FM ?
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