<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body><div>Hi Michael,</div><div><br></div><div>the antenna seems not to be active according to the wiring diagram and some forum posts I found.</div><div><br></div><div>I double checked the connection of GPS and GSM. Seems to OK ...</div><div><br></div><div>Greetinx</div><div><br></div><div>Chris</div><div><br></div><div><br></div><div>Am Mittwoch, den 05.08.2020, 08:01 +0200 schrieb Michael Balzer:</div><blockquote type="cite">
Chris,<br>
<br>
two additional thoughts:<br>
<br>
- maybe the VW antenna contains a GSM and a GPS antenna (?), and you
connected the wrong one?<br>
<br>
- maybe the VW antenna is an active one and needs a supply voltage
which is currently missing?<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 05.08.20 um 07:24 schrieb Mark
Webb-Johnson:<br>
</div>
<blockquote type="cite" cite="mid:431C9ED3-C59C-46A6-948E-9800300BDFD9@webb-johnson.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Maybe,
<div class=""><br class="">
</div>
<div class="">Or the VW antenna is way off on specification.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 5 Aug 2020, at 1:17 PM, Chris van der
Meijden <<a href="mailto:chris@arachnon.de" class="" moz-do-not-send="true">chris@arachnon.de</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div class="">
<div class="">Thank you for your response.</div>
<div class=""><br class="">
</div>
<div class="">That leaves me with a poor home made SMA
to Fakra adapter cable, I guess ...</div>
<div class=""><br class="">
</div>
<div class="">Regards</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<div class=""><br class="">
</div>
<div class="">Am Mittwoch, den 05.08.2020, 09:27 +0800
schrieb Mark Webb-Johnson:</div>
<blockquote type="cite" class="">The antenna surely
helps, but in some locations you can receive a signal
with a piece of wet string resting on the antenna
connection. Seriously. At my office desktop, I still
get 3G without an antenna connected (but I don’t
recommend it due to possible feedback in the modem
module).
<div class=""><br class="">
</div>
<div class="">These are not binary on/off situations.
An antenna rated to 1710-1990 will still work at
1991, or even 2100, but just not optimally with the
best reception or transmission.<br class="">
<div class=""><br class="">
</div>
<div class="">The original Fasttech antennas were
designed for 2G (OVMS v2), but should still cover
some 3G ranges optimally. The newer ones (from
Medlock in USA and OpenEnergyMonitor in UK) should
cover all ranges (up to and including 4G LTE) -
and we used these for radio certification so have
been very thoroughly tested at all the supported
2G and 3G frequency ranges.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 5 Aug 2020, at 12:21 AM, Chris
van der Meijden <<a href="mailto:chris@arachnon.de" class="" moz-do-not-send="true">chris@arachnon.de</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
<div class="">
<div class="">Still digging on the subject
...</div>
<div class=""><br class="">
</div>
<div class="">Today I took my original
Fasttech OVMS v2 antenna out of my Nissan
Leaf and connected it to the OVMS v3 in
our VW e-Up. And surprise, surprise I got
direct connection over the SIM to the
network.</div>
<div class=""><br class="">
</div>
<div class="">The VW antenna gives me -101
dBm, the Fasttech antenna gives me -91
dBm.</div>
<div class=""><br class="">
</div>
<div class="">So I took a look at the
frequencies ...</div>
<div class=""><br class="">
</div>
<div class="">The old fasttech antenna has a
frequency range of 824-960 / 1710-1990.
</div>
<div class=""><br class="">
</div>
<div class="">o2 (my SIM card provider) uses
GSM 900 and GSM+LTE 1800 for 2g (4g LTE
cannot be used on the SIM5360) and uses
UMTS 2100 for 3g.</div>
<div class=""><br class="">
</div>
<div class="">Now I have two theories on
what make things go wrong with the VW
antenna, but work with the fasttech
antenna:</div>
<div class=""><br class="">
</div>
<div class="">1. My home made sma / fakra
adapter cable to the VW antenna is bad
(could be, but in the city it connects)</div>
<div class=""><br class="">
</div>
<div class="">2. Because 3g on 2100 mHz is
not available through the fasttech
antenna, OVMS v3 is forced to 2g and
everything runs fine.</div>
<div class=""><br class="">
</div>
<div class="">Any corrections on the second
theory are welcome. I'm guessing ...</div>
<div class=""><br class="">
</div>
<div class="">I will buy an other sma 2g/3g
antenna just to get rid of the problem,
but will also continue thinking on this
one.</div>
<div class=""><br class="">
</div>
<div class="">Greetinx</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Am Montag, den 03.08.2020,
12:31 +0200 schrieb Chris van der Meijden:</div>
<blockquote type="cite" class="">
<div class="">Hi Michael</div>
<div class=""><br class="">
</div>
<div class="">yeah, economical visionaries
are always a lot of fun :-))</div>
<div class=""><br class="">
</div>
<div class="">I read that "GSM voices
services" line too and checked on that
with my mobile phone. I restricted the
connection of the phone with
*#*#4636#*#* to "GSM auto (PRL)" and it
connects to EDGE. So data over GSM is
available ...</div>
<div class=""><br class="">
</div>
<div class="">Still mysterious. Will dig
some more ...</div>
<div class=""><br class="">
</div>
<div class="">Greetinx</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<div class=""> </div>
<div class=""><br class="">
</div>
<div class="">Am Montag, den 03.08.2020,
12:21 +0200 schrieb Michael Balzer:</div>
<blockquote type="cite" class=""> Chris,<br class="">
<br class="">
we don't tell the modem to restrict
itself in any way. Bugs in the modem
firmware are likely, but I think a
serious bug like this would have been
solved early.<br class="">
<br class="">
I've read the pilot description now, and
you need to pay attention to this
section:<br class="">
<br class="">
<blockquote type="cite" class="">statt
der üblichen drei Dienste LTE, UMTS
und GSM kommen in Kirchfarrnbach "nur"
LTE 800 und LTE 900 für die
Datenversorgung sowie GSM für
Sprachdienste und SMS zum Einsatz. Auf
UMTS haben die Funknetzplaner hier
verzichtet, weil bereits LTE und GSM
alle Anforderungen der Bevölkerung
erfüllen.</blockquote>
<br class="">
…translated…<br class="">
<blockquote type="cite" class="">Instead
of the usual three services LTE, UMTS
and GSM, "only" LTE 800 and LTE 900
are used in Kirchfarrnbach for data
supply as well as GSM for voice
services and SMS. The radio network
planners have dispensed with UMTS here
because LTE and GSM already meet all
the requirements of the population.</blockquote>
<br class="">
So you have neither UMTS nor EDGE. GSM
is only available for voice streams and
SMS. Data is only available via LTE.<br class="">
<br class="">
Your only option is to tell them they're
a bunch of … outstanding economical
visionaries, who could possibly consider
rethinking their IoT compatibility ;-)<br class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 03.08.20
um 11:33 schrieb Chris van der
Meijden:<br class="">
</div>
<blockquote type="cite" cite="mid:1596447186.2720.4.camel@arachnon.de" class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
<div class="">I did some more reading
on the SIM5360 and also digged a bit
through the simcom source. Found
loads of AT-commands there :-)</div>
<div class=""><br class="">
</div>
<div class="">I could not find an AT
command to restrict the selection to
2g. Perhaps I did not look deep
enough, but if someone knows the
command ...</div>
<div class=""><br class="">
</div>
<div class="">I'm still thinking why
the automatic fallback to 2g does
not happen. </div>
<div class=""><br class="">
</div>
<div class="">- The transmitter offers
only 2g (GSM 900 mHz) and LTE (800
or 1800). No 3g.</div>
<div class="">- I have a signal
strength of -110 to -100 dBm</div>
<div class="">- AT+COPS? gives me an
empty response.</div>
<div class=""><br class="">
</div>
<div class="">Could it be possible,
that somewhere in the code something
like</div>
<div class=""><br class="">
</div>
<div class="">- I don't have 3g</div>
<div class="">- I do have LTE</div>
<div class="">- Lets try LTE</div>
<div class="">- I see LTE</div>
<div class="">- I have no hardware for
LTE</div>
<div class="">- OK, don't do anything</div>
<div class=""><br class="">
</div>
<div class="">happens? So somehow
fallback to 2g never happens?</div>
<div class=""><br class="">
</div>
<div class="">Just guessing around ...</div>
<div class=""><br class="">
</div>
<div class="">Regards</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<div class=""> </div>
<div class=""><br class="">
</div>
<div class="">Am Montag, den
03.08.2020, 10:10 +0800 schrieb Mark
Webb-Johnson:</div>
<blockquote type="cite" class="">The
SIM5360E should auto-switch between
2G and 3G. It supports the following
frequency bands:
<div class=""><br class="">
</div>
<blockquote style="margin: 0 0 0
40px; border: none; padding: 0px;" class="">
<div class=""><span style="font-family: arial,
verdana, helvetica,
sans-serif; font-size: 16px;
font-variant-ligatures:
normal; orphans: 2; widows: 2;
background-color: rgb(255,
255, 255);" class="">GSM/GPRS/EDGE
850/900/1800/1900MHz;</span></div>
<div class=""><span style="font-family: arial,
verdana, helvetica,
sans-serif; font-size: 16px;
font-variant-ligatures:
normal; orphans: 2; widows: 2;
background-color: rgb(255,
255, 255);" class="">UMTS/HSPA+
900/2100MHz</span></div>
</blockquote>
<div class=""><br class="">
</div>
<div class="">There are SIMCOM
options/commands to restrict the
selection, but the default is
automatic.</div>
<div class=""><br class="">
<div class="">Regards, Mark</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 2 Aug 2020,
at 6:40 PM, Chris van der
Meijden <<a href="mailto:chris@arachnon.de" class="" moz-do-not-send="true">chris@arachnon.de</a>>
wrote:</div>
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div class="">
<div class="">Hey Michael</div>
<div class=""><br class="">
</div>
<div class="">Thanx for
the help :-)</div>
<div class=""><br class="">
</div>
<div class="">The AT
commands are working
now, but as expected no
connection at all. So
also no fallback to 2g.
Or no GPRS offered on 2g
...</div>
<div class=""><br class="">
</div>
<div class="">Here some
(German) information on
the "site lite"
transmitters:</div>
<div class=""><br class="">
</div>
<div class=""><a href="https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152" class="" moz-do-not-send="true">https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152</a></div>
<div class=""><br class="">
</div>
<div class="">I also did
not find any AT command
for the SIM5360 to force
2g. I will play a bit
around with the modem in
the next days. Will also
try congstar, I do have
a congstar SIM laying
around here ...</div>
<div class=""><br class="">
</div>
<div class="">Greetinx</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Am Sonntag,
den 02.08.2020, 10:59
+0200 schrieb Michael
Balzer:</div>
<blockquote type="cite" class=""> Chris,<br class="">
<br class="">
how to send modem
commands and read the
responses:<br class="">
<br class="">
<tt class="">OVMS# log
level debug simcom</tt><tt class=""><br class="">
</tt><tt class="">Logging
level for simcom set
to debug</tt><tt class=""><br class="">
</tt><tt class="">OVMS#
simcom cmd AT+COPS?</tt><tt class=""><br class="">
</tt><tt class="">SIMCOM
command has been sent.</tt><tt class=""><br class="">
</tt><tt class="">D
(164488782) simcom: tx
mcmd ch=4 len=10 :
AT+COPS?</tt><tt class=""><br class="">
</tt><tt class="">D
(164488792) simcom: rx
line ch=4 len=23 :
+COPS:
0,0,"congstar",2</tt><tt class=""><br class="">
</tt><tt class="">D
(164488802) simcom: rx
line ch=4 len=2 : OK</tt><br class="">
<br class="">
Now let's see if we have
3G:<br class="">
<br class="">
<tt class="">OVMS#
simcom cmd AT+CPSI?</tt><tt class=""><br class="">
</tt><tt class="">SIMCOM
command has been sent.</tt><tt class=""><br class="">
</tt><tt class="">D
(164693462) simcom: tx
mcmd ch=4 len=10 :
AT+CPSI?</tt><tt class=""><br class="">
</tt><tt class="">D
(164693482) simcom: rx
line ch=4 len=85 :
+CPSI:
WCDMA,Online,262-01,0x16C3,7824927,WCDMA
IMT
2000,454,10836,0,7.5,104,18,8,500</tt><tt class=""><br class="">
</tt><tt class="">D
(164693482) simcom: rx
line ch=4 len=2 : OK</tt><br class="">
<br class="">
Yes. Well, no surprise,
Telekom network :-).<br class="">
<br class="">
The SIM5360 is supposed
to automatically fall
back to 2G if 3G isn't
available. On a quick
browse through the
manual, I didn't find a
command to force 2G,
just one to lock to a
specific 2G cell… you
could do that depending
on your location, but
maybe you should first
inspect your modem
status now.<br class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am
02.08.20 um 09:39
schrieb Chris van der
Meijden:<br class="">
</div>
<blockquote type="cite" cite="mid:1596353995.7318.1.camel@arachnon.de" class="">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8" class="">
<div class="">Hi all</div>
<div class=""><br class="">
</div>
<div class="">I'm
trying to understand
some principals of
the SIM connection
methods of OVMS.</div>
<div class=""><br class="">
</div>
<div class="">Reason
is that I recently
moved from "the big
city" Munich to the
very much rural
village Thalham. In
Thalham we have so
called "lite" mobile
transmitters. These
transmitters are
installed, as far as
I understood, to
safe money and to
prepare the
transition of the
providers to 4g /
5g. They are forcing
the frequencies
towards the 4g band
with those.</div>
<div class=""><br class="">
</div>
<div class="">So these
transmitters seem to
offer only 2g and
4g, but no more 3g
(really ???).</div>
<div class=""><br class="">
</div>
<div class="">I don't
have any network
connection with the
SIM in my OVMS here
in Thalham. In the
next village Zolling
I have connection.
In Zolling they
don't have the
"lite" transmitters,
but still have full
3g support. The
antenna of my OVMS
is working well
(-100 dBm to -70
dBm).</div>
<div class=""><br class="">
</div>
<div class="">Now my
questions ...</div>
<div class=""><br class="">
</div>
<div class="">Does
OVMS have a fallback
on SIM5360 Europe to
2g (EDGE) if 3g is
not available?</div>
<div class=""><br class="">
</div>
<div class="">I also
did some reading in
the modem
documentation and
tried to send some
AT commands. Goal is
to try to force the
SIM into 2g mode. I
tried i.e.</div>
<div class=""><br class="">
</div>
<div class="">simcom
muxtx 2 AT+COPS?</div>
<div class=""><br class="">
</div>
<div class="">to get
some information
from the SIM, but I
don't get an answer
on that command at
all. No matter what
channel I try. Am I
missing something
there?</div>
<div class=""><br class="">
</div>
<div class="">Thanx
for input.</div>
<div class=""><br class="">
</div>
<div class="">Regards</div>
<div class=""><br class="">
</div>
<div class="">Chris</div>
<br class="">
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