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em7455 no signal always

Posted: Sun Feb 27, 2022 8:03 am
by brcisna
Hello All,

A new sealed Sierra Wireless EM7455 module with a usb NGFF M.2 adapter.
Flashed generic firmware twice and with a working sim,am only getting "no signal' when i do mmcli -m 0 for modem information in Debian linux
Have done two of these before and at same location. Only difference is my first two setups,I used an pci-e 1x to M.2 NGFF adapter. This adapter did come with 4dbm rubber ducky antennas. This only get about 50% signal at best at location
The new SW modem did come with the generic 'wire antennas'. I also had another pair of similar wire antennas i know has worked for testing.
Have tried to get familiar with the AT all over again ,but anyone have this happen on this series of modems. No Signal?

Thanks

Re: em7455 no signal always

Posted: Sun Feb 27, 2022 3:48 pm
by DDK65JAG
Mention of Debian linux made my eyes glaze over. But, yeah no signal seems strange. Only things that come to my
simple mind is rp-sma to sma mismatch or modem in low power mode?

Good luck, DDK