At 09:08 PM 09/11/2004 +1000, you wrote:
> Rockby Electronics have the Conexant GSM TW03 DB100 module going for=20
>A$ 44.545 plus GST.
>
>It comes with no aerial or sim card holder and is naturally obsolete=20
>(I believe). One shock when mine arrived today peak transmitting power=20
>is 2A, my idea of using it in a project that is battery powered may=20
>not work.
>
>The manual (and what a tome it is) has to be purchased separately

Hi

GSM devices use GMSK modulation, ie RF bursts 577uS long every 4.6mS. Tha=
ts
where the 2A comes in.


Here are the specs of some other, not-obsolete devices;

Motorola g18 GSM/GPRS OEM Embedded Module
Voltage:  3.0 to 6V measured at the I/O connector during the transmit slo=
t
(576=B5s out of 4.6ms)
Current: =3D7.2 +/- 0.5 mA @ DRX 2 standby (sleep)
         =3D3.5 +/- 0.5 mA @ DRX 9 standby (sleep)
         < 150uA off current
         300mA avg. in call at power level 5 (max. 350 mA)
         1.2 A peak @ 217 Hz at power level 5 (max. 1.8 A)

The Wavecom Integra M2106 modem
Power supply:
              . 5VDC / 1A
              . 310mA average current in communication (GSM900, 0% DTX, P=
max)
              . 9mA in idle mode
              . Peak 1,87A @ 5V


Of more concern to me is the itsy weeny 40 pin connector you have to
interface to.

Regards
Roland Jollivet


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