From falcon at freecalypso.org  Sat Jan  6 09:19:51 2024
From: falcon at freecalypso.org (Mychaela Falconia)
Date: Sat, 06 Jan 2024 01:19:51 -0800
Subject: GSM class reminder
Message-ID: <20240106091958.A5CB13740331@freecalypso.org>

Hello class,

Just a reminder, our next videoconference session will be a little
less than 9 hours from now, at 18:00 UTC which is also 10:00 USA
Pacific Standard Time.  Same Jitsi videoconference platform as before:

https://meet.jit.si/moderated/de280e2299acb289ffa38669f78ac91f05ceec6da5062ce761a35a0f32cd7a6c

The primary topic for this session will be GSM frequency bands: which
frequencies are usable for GSM, which bands work better for old phones,
the difference between uplink and downlink frequencies, and how
different bands overlap.  Those of you who have an RF Explorer
instrument will get the most benefit out of this class, as we'll be
able to get into a hands-on portion (scanning your local RF environment
for possible spots where a little rebel GSM BTS can operate), but even
if you don't have this instrument yet, you will still benefit from the
theory portion of the class, which we'll do before the hands-on
portion.  (You always have to know the theory first!)

I look forward to seeing many of you soon!

Sincerely,
Mother Mychaela aka Mrs. Falconia

From falcon at freecalypso.org  Sat Jan  6 20:29:49 2024
From: falcon at freecalypso.org (Mychaela Falconia)
Date: Sat, 06 Jan 2024 12:29:49 -0800
Subject: Class notes from this morning
Message-ID: <20240106202957.7015A3740188@freecalypso.org>

Hello dear students,

This morning's GSM class had a low attendance unfortunately, but here
are the presentation notes from today:

https://www.freecalypso.org/members/falcon/class-notes/freq-pres.pdf

This little presentation shows what frequency bands are usable for GSM,
how different bands fare in terms of old phone compatibility, where
the actual uplink and downlink frequencies are for each band, and how
they overlap.  The pictures and notes don't say much because the
explanatory commentary is intended to be covered interactively in the
class.  For everyone who missed today, we can go over it in the next
session, which is yet to be scheduled.

M~