On Sat, 4 Jul 2009 18:24:34 +0200 (CEST) Alexander Lehner <leh...@edv-buero-lehner.de> wrote:
> > > On Sat, 4 Jul 2009, Werner Almesberger wrote: > > > Timo Juhani Lindfors wrote: > >>> My assumption is, that it takes far more than 2.5W, since the USB dongle > >> > >> How about measuring that? Just read the current_now file in /sys. > > > > Telephony can have very high current peaks, in the order of 2 A. > > They are only short, i.e., the size of some transmit time slots, > > so the average current is much lower, but if a design doesn't > > adequately buffer those peaks, there will be problems. > > > > Problems should get worse in areas with poor or no reception. > > Yes, that makes absolutely sense. As soon as I started to transmit some > more data than only a ping or nslookup, the connection was gone. > Also, I _am_ in a region with poor reception, and I have only GPRS, no > UMTS. > > So maybe Timo has better reception conditions or the better hardware > around the Huawai chip. I have an UMTS dongle from FONIC which uses the O2 > Network (whuaaa...). > > Alex. Perhaps one could add a larger by pass capacitor on either the UBS stick or inside the phone? -- Visti Andresen _______________________________________________ devel mailing list devel@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/devel
