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enrico
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Two questions about GPS module for LtAP mini LTE Rev3

Mon Nov 29, 2021 11:55 am

Hello friends, good mornong,
I have two questions about gps module for LtAP mini LTE Rev3. I have see that under the platic cover have an internal GPS antenna connected to pin marked "ext gps".
This built-in antenna is not good to take a gps satellite signal ? In this case how set GPS menu: internal antenna or external ?

Second question: if I connect a SMA adapter cable (ACSMAUFL pigtail) but d'ont connect any external GPS antenna I damege the module ? It''s safe to teke power on whitout anys antenna gps connected

Thank to all.

E.
 
spynappels
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Re: Two questions about GPS module for LtAP mini LTE Rev3

Mon Nov 29, 2021 12:28 pm

It''s safe to teke power on whitout anys antenna gps connected
While I can't answer the other questions, for this one the answer should be yes.
GPS receivers only use their antenna for receiving signal, not for transmitting. While a transmitter should never be run without an antenna as it carries the risk of damaging the RF Amplifier, for a receive-only module this is not a consideration. You can run any radio receiver without an antenna, the worst that will happen is that you'll simply not receive any signals.
 
enrico
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Joined: Wed Apr 29, 2020 8:56 pm

Re: Two questions about GPS module for LtAP mini LTE Rev3

Thu Dec 02, 2021 9:47 am

Thanks for answers.
I will try to connect an external antenna.
Now, with the built-in internal antenna, I have not received any GPS satellite! ... even after hours, with the modem left outdoors, under a clean sky.
it's a strange mystery!!

Bye,
E.
 
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spippan
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Re: Two questions about GPS module for LtAP mini LTE Rev3

Fri Oct 28, 2022 3:48 pm

Thanks for answers.
I will try to connect an external antenna.
Now, with the built-in internal antenna, I have not received any GPS satellite! ... even after hours, with the modem left outdoors, under a clean sky.
it's a strange mystery!!

Bye,
E.
same here with a LtAP mini and different antennas and different rOS versions
i do not get a sattelite on any of those versions

factory: 6.44.6
6.49.7 (stable)
7.5 (stable)
7.6 (stable)
7.7 beta4


i tested the stock antenna (under the black cover of the LtAP mini case)
a combined 4G/GPS active antenna
a simple uFL antenna
[admin@bkk-car-rtr01] /port> print 
Flags: I - inactive 
 #   DEVICE NAME                     CHANNELS USED-BY                   BAUD-RATE
 0          serial0                         1 GPS                       auto     
[admin@bkk-car-rtr01] /system gps> export 
# oct/28/2022 14:47:53 by RouterOS 6.49.7
# software id = 2K34-BC1S
#
# model = RB912R-2nD
# serial number = C46C0BD50718
/system gps
set coordinate-format=dd enabled=yes port=serial0
[admin@bkk-car-rtr01] /system gps> pri
             enabled: yes
                port: serial0
             channel: 0
         init-string: 
     set-system-time: no
   coordinate-format: dd
  gps-antenna-select: external
[admin@bkk-car-rtr01] /system gps> 

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