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  1. X

    about the modulation fail due to the external regulator

    here is a problem about the spectrum of GSM . A GSM Module , which power from external DC-DC regulator. as the osciallator of this DC-DC regualtor works around 400khz , when test GSM spectrum due to modulation , it fail on 400Khz . as its fixed working frequence of regulator , how to resolve...
  2. X

    Problem with AGC in Locosto

    AGC in Locosto ?? RFDave , i couldn't get some IEEE paper as to what you said , could you share them for us? thanks
  3. X

    High dielectric antenna for mobile phone application?

    high Dielectric antenna Do you have some detailed for ATC and HDA ? Thanks
  4. X

    Guidelines for designing PIFA antenna

    Designing PIFA hope more guys to talk about your experiences . i am very concern it.
  5. X

    How to improve the "Pi-pa" noise when make a call

    Re: How to improve the "Pi-pa" noise when make a c thanks for your suggestion , i will try on antenna . but i searched this issue on the web , found some earphones vendors declared their eraphones are with anti-noise feature , i wonder if it's related to the chipset's DSP , maybe others. wish...
  6. X

    How to improve the "Pi-pa" noise when make a call

    Re: How to improve the "Pi-pa" noise when make a c Looking forward to your reply. thanks
  7. X

    How to improve the "Pi-pa" noise when make a call

    When two bluetooth devices conncting , for example , phone with bluetooth function and bluetooth earphone. when making a call , there seems a bit "Pi-Pa" background noise from earphone . it seems worse when both devices are a bit away. how to debug it ? Our BT chipset is CSR BC4. thanks
  8. X

    REQ: some documents about the calibration for GSM phone

    i hope i could get some document detail about it , could you help me?
  9. X

    REQ: some documents about the calibration for GSM phone

    gsm modem calibration i hope someone can help me ,thanks
  10. X

    REQ: some documents about the calibration for GSM phone

    gsm phone calibration Is there someone who can share some documents about the TCXO and crystal calibration theory for GSM phone? thanks
  11. X

    about the timing of normal burst and monitor burst

    My question is also : when searching on GSM network , What's their relation or sequneces between the normal and monitor burst?
  12. X

    about the timing of normal burst and monitor burst

    Could you explain the timing of nomal burst and monitor burst on the GSM? Why there are 3 pulses before the normal burst when RX ?
  13. X

    some epaper about calibration of phone

    Is there sombody who can share some articles or papers for battery or RF calibration of GSM phone? thanks.
  14. X

    some suggestion on antenna design inside a metal housing

    Could u give some suggestion or guideline on inside antenna design inside a metal housing of a mobile phone? the antenna i design is monopole or PIFA . Do you think which is better for performance ? thans in advance.
  15. X

    design about the PIFA

    Do u have some experiences on design a PIFA on the slide phone . what have to be concerned on the slide phone? and How to improve the sensitivity on this phone. Any suggestion or information will be welcome.
  16. X

    Ground size of Antenna

    Flatulent , Do you have its application notes or lecture which let me know more? thanks
  17. X

    Ground size of Antenna

    but i met some cases in the design of chip antenna .it always depends on so big Non-GND area around the antenna. Why ?
  18. X

    what cause modulation fail?

    I use RF3146, but on an other project which use the RF3146, it is OK on modulation.

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