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  1. roger88

    Hayes modem command AT+CRM=0, AT+CRM=1, etc.

    I see this command being used this way in a system consisting of a PC hooked to a cellphone: AT+CRM=0 for circuit data service AT+CRM=1 for a generic PPP Internet service AT+CRM=2 for a cellular digital packet data service I can't find the +CRM command in Hayes command reference materials. Is...
  2. roger88

    GPRS Modem using ATD command *99# for PC-Internet connection

    I am seeking help understanding GPRS modems, in partcular as described by a patent. I am also seeking information regarding the earliest use of the patented technology. I am interested in input re my particular questions below and in talking to any experts offline. I need expert help...
  3. roger88

    Seeking oldest dual-band non-uniform monopole helical antenna

    BrianR, Are you saying that you had a single wire wrapped tightly at the bottom and not as tightly at the top such that you could receive two different non-contiguous frequencies? What do you mean by "replaceable tops?" I'm not quite picturing this design. -Roger88
  4. roger88

    Seeking oldest dual-band non-uniform monopole helical antenna

    I am seeking the earliest example of a single-conductor helical antenna with two different sections (differing by either pitch and/or diameter) designed for dual-band (or multi-band) use - particularly in the normal mode.
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