HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 58 of 111 2019-11-25
GSM/WCDMA Antenna - Installation Guidelines
• Install the antenna in a place covered by the GSM signal.
• If the device antenna is located greater then 20cm from the human body and there
are no co-located transmitter then the Telit FCC/IC approvals can be re-used by
the end product
• If the device antenna is located less then 20cm from the human body or there are
no co-located transmitter then the additional FCC/IC testing may be required for
the end product (Telit FCC/IC approvals cannot be reused)
• Antenna shall not be installed inside metal cases
• Antenna shall be installed also according Antenna manufacturer instructions.
Antenna Diversity Requirements
This product is including an input for a second RX antenna to improve the radio sensitivity.
The function is called Antenna Diversity.
Depending by frequency band(s) provided by the network
operator, the customer shall use the most suitable antenna for
that/those band(s)
70 MHz in GSM850, 80 MHz in GSM900 & 140 MHz PCS
band
70 MHz in WCDMA Band V
80 MHz in WCDMA Band VIII
140 MHz in WCDMA Band II
250 MHz in WCDMA Band I
When using the HE910, since there's no antenna connector on the module, the antenna
must be connected to the HE910 antenna pad (F1) by means of a transmission line
implemented on the PCB.
In the case the antenna is not directly connected at the antenna pad of the HE910, then a
PCB line is needed in order to connect with it or with its connector.
The second Rx antenna should not be located in the close vicinity of main antenna. In
order to improve Diversity Gain, Isolation and reduce mutual interaction, the two antennas
should be located at the maximum reciprocal distance possible, taking into consideration
the available space into the application.
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