G2 tri-band / quad-band

This is merely a historical archive of years 2008-2021, before the migration to mailman3.

A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/baseband-devel@lists.osmocom.org/.

Harald Welte laforge at gnumonks.org
Tue Nov 9 08:10:46 UTC 2010


On Tue, Nov 09, 2010 at 06:29:00AM +0000, Wolfgang Spraul wrote:

> I could imagine that some ICs on the G2 can do quad, but other
> components on the board (filters?) actually pick 3 of those 4?

According to the schematics it is a quad-band design.  The Antenna switch is a
SP5T (two bands tx, 3 bands rx), followed by an additional filter that
separates the 850 from the 900 in the RX path.

Given that the filters (including the 850/900) are all unbalanced-to-balanced
filters, I doubt that somebody would simply not place them (as you cannot
replace them just with a 0ohms resistor or soemthing.  By removing one filter
you would not be able to produce a standard 850/1800/1900 or 950/1800/1900
configuration but something like 850/900/1800 or 850/900/1900 which doesn't
maeke sense.

My personal educated guess is: they are all quad-band.

-- 
- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)




More information about the baseband-devel mailing list