# MC8790 Diversity - Questions on physical configuration

**URL:** <https://forum.sierrawireless.com/t/mc8790-diversity-questions-on-physical-configuration/6839>\
**Category:** MC/EM Series\
**Created:** [November 6, 2013, 4:20pm UTC](https://forum.sierrawireless.com/t/mc8790-diversity-questions-on-physical-configuration/6839 "2013-11-06T16:20:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pdbuick](https://avatars.discourse-cdn.com/v4/letter/p/43a26b/32.png) [@pdbuick](https://forum.sierrawireless.com/u/pdbuick)\
**Post date:** [November 6, 2013, 4:20pm UTC](https://forum.sierrawireless.com/t/mc8790-diversity-questions-on-physical-configuration/6839/1 "2013-11-06T16:20:29Z")

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I am still working with a considerable inventory of these modules. We are using them for M2M communication and GPS location. There are a few which are only being used for the M2M communication. I note that these don’t have _ANY_ antenna nor a dummy load on the AUX port (GPS as I understand it). The others have a power injection circuit and then an antenna with LNA that is for the GPS band on the AUX port.

My questions are:

[_]Does the second connector have to have a 50 ohm terminator if it is not in use?[/_]  
[_]Does the lack of a 50 ohm terminating resistance on the AUX port significantly effect the cellular function?[/_]  
[_]For diversity reception, would I simply use a second cellular antenna on the AUX connector?[/_]  
[_]Is there a software command I have to use to enable diversity reception?[/_]  
[_]Can diversity work with the power injector circuit and GPS antenna on the AUX port?[/_]  
[_]Should we perhaps be using a cellular multiband antenna instead of a GPS specific antenna on the AUX port?[/_]  
[_]Does the use of a combined dome antenna with both cellular and GPS antennas in one location still do diversity reception? If not, how far apart should the antennas be for reasonable diversity performance?[/_]  
[_]Is there a hardware document available for these devices, which likely answers many of these questions?[/_]

Thanks in advance for any information that you can provide. I do understand radio technology being an E.E.T. and an Amateur Radio operator at the Advanced level in Canada, so keep that in mind when formulating your answers.