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Recent content by simonleung

  1. S

    Inconsistent SDHC card OCR register

    Hello all, I'm trying to get SDHC card (SanDisk 4G) working with my ARM microcontroller. Here is what I'm doing - Send CMD0. Receives 0x1 - Send CMD8. Receives 0x1 + 0x00 0x00 0x01 0xAA - Send CMD58. This is where things can go wrong. It always return 0xFF and 0x1. Afterwards, the OCR bytes...
  2. S

    GPRS registration problem

    Hi all, I'm trying to get a Wavecom Q64 working on O2 network in Ireland. I just can't get registered. What I did: AT+CMEE=1 OK AT+CGCLASS="CG" OK AT+CGATT=1 +CME ERROR: 148 148 means "unspecified GPRS error" which isn't really helpful. Any suggestions? Thanks in advance. ----------...
  3. S

    No signal problem with GSM modem

    I've used a multimeter to check the antenna and it appears to be OK. Is it still a good idea to try preparing my own antenna? Otherwise I'll just RMA it.
  4. S

    No signal problem with GSM modem

    Thanks. I've tried a few combinations: SIM + antenna SIM + no antenna No SIM + antenna No SIM + no antenna And in all situations, CSQ command always returns 99,99. AT commands are fine, I can unlock the SIM card with a PIN (I'm using the module with SIM from my phone). ---------- Post...
  5. S

    No signal problem with GSM modem

    Hi all, I have a setup with wavecom Q64 + antenna and can't seem to get registered on a network. There a two things that I think might be wrong: 1. signal: AT+CSQ always returns 99,99, with or without SIM. I read somewhere that this command can be issued in either situation, true? 2. IMEI...

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