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On a similar theme, I just installed a SSB radio and am wondering how
people are using theirs. Is Sailmail the way to go? Do I need the
expensive PACTOR II modem? The channels available are a little
overwhelming. Any advice for a novice?
Thanks,
At 12:47 PM 12/29/01 -0600, Karl Denninger wrote:
>Most of the rest of the world is on GSM, and on a frequency different than
>the US. There ARE two carriers (Cingular and Voicestream) that use GSM in
>the USA.
>
>GSM phones are COMPLETELY incompatable with AMPS/TDMA/CDMA digital and
>analog services. AMPS is the older 800Mhz analog service. TDMA and CDMA
>are either digital on 800Mhz or PCS service, typically at 1.4ghz (if I
>recall the frequency correctly)
>
>If you have a GSM phone (Voicestream or Cingular) it will NOT work on any of
>the other carrier's networks. Those phones cannot run on AMPS, CDMA or
>TDMA. Period. The systems are completely incompatable. The converse is
>true as well.
>
>"Tri-Mode" phones come in two flavors - US ones that do either CDMA or TDMA
>*AND* AMPS, or international GSM phones that are GSM-only but handle all
>three GSM frequencies (we use a different frequency than Europe - Europe and
>the rest of the world have two different frequencies in use, we have only
>one.)
>
>If you have a US GSM phone it is PROBABLY single-frequency, unless you
>bought (or rented) it specifically to be able to roam overseas.
>
>GSM phones use a "SIM card" - basically a NVRAM card that contains your
>authentication info plus your phonebook, messages, etc. TDMA/CDMA/AMPS
>phones have the info in the *PHONE* and, theoretically, cannot be modified
>(in practice they can be and often are)
>
>Older phones do not have encryption on the authentication information. AMPS
>doesn't support it, and theft of service is rampant on analog systems for
>this reason. CDMA and TDMA, along with all GSM systems, DO support and use
>encryption on the phone's authentication and theft of service is a LOT
>harder to pull off.
>
>GSM has some really nice capabilities that the US standards DO NOT,
>including 56kbps data. However, to date at least, both Cingular and
>Voicestream price their data services somewhere north of outrageous, which
>is unfortunate because the only other real option is CDPD, the older analog
>packet standard (of which AT&T is the only carrier of significance, and they
>have limited capacity and reach), which is limited to 14.4kbps.
>
>--
>--
>Karl Denninger () Internet Consultant & Kids Rights Activist
>http://www.denninger.net Cost-effective Consulting
>http://childrens-justice.org SIGN THE UPREPA PETITION TODAY
>
>On Sat, Dec 29, 2001 at 12:26:42PM -0500, csutter wrote:
> > This has been my experience, too.
> >
> > The it is tricky now as to what phones will work in Canada, US, UK,
> and Europe. We don't
> > have phones with simm (?) cards, WAP, etc. yet. But there are
> > some models that will cross all these lines.
> >
> > Corinne Sutter-Brown
> >
> >
> >
> >
> >
> >
> > automatic mail servant: TheBat! 1.53d
> >
> >
> >
> > Saturday, December 29, 2001, 12:15:41 PM, you wrote:
> >
> > Spc> Incorrect. I've owned several digital cell phones, they've all
> been able to switch to analogue. They've all been dual mode phones.
> Tri-mode phones are generally used by people who travel to
> > Spc> Europe where the frequencies are different. Dual mode phones can
> be "forced" into either modes. I've travelled to different areas of
> Ontario, and the phone beeps to let me know that it's gone
> > Spc> analogue.
> >
> > Spc> I generally replace the phone when the battery stops holding a
> charge. It's cheaper to get a new phone than to replace the battery
> >
> > Spc> Pierre & Tracy Mitham
> > Spc> aboard Shanica J II
> >
> > Spc> ------------------------------
> > Spc> This mobile message sent using PocketMail.
> > Spc> Sign up for unlimited e-mail at www.PocketMail.com.
> >
> > ___________________________________________________________________________
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Stan Gardner ~~~_/) ~~~ Schlumberger
Automated Test Equipment
Senior Mechanical Engineer Probe Systems
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FAX - 408-586 4654 San Jose, CA
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