PowerLogic T300 - What GPS antenna for HU250 4G+GPS modem

[milica_dukic_]

Hello everyone,

In one project with PowerLogic T300 (formerly named Easergy T300), we have a 4G+GPS optional modem for the PowerLogic HU250 module in order to use it as GPS synchronization device.

• Can we use the small antenna which came with that modem, or do we need another one?
  
• If another antenna is necessary: can we use SE antenna ref. EMS59161, or do we have to use some third party antenna (and in that case, what model and what characteristics does it need to have)?

Thanks in advance,

Milica Dukić

[Anonymous user · Accepted solution]

Hello Milica,

yes, that's correct, you absolutely need 2 different antennas, one used for the GPS synchro and the other one for the 3G or 4G cellular data. 

EMS59161 must be connected to the upper connector of HU250 for the GPS synchronization and has to be localized outdoor, with a direct view to the sky... and eventually a  3rd party antenna should make the job if it is dedicated for that frequency : 1575 MHz.

One important point, in case you are using cellular data, it's recommended also using the outdoor antenna (EMS59160) connected to the lower connector of HU250. In this case, it is possible also to synchronize the T300 with this antenna, using a SNTP server available inside your cellular network, if any. This synchronisation, using the cellular data is less accurate than using the GPS antenna which provide a 1 ms time synchronisation accuracy. 

BR

Yves Chollot

[milica_dukic_]

@Anonymous user thank you for help.

Best regards,
Milica Dukić