User's Manual

ITC2100-NA Operation and Service Manual Version 1.0

Page 27 of 129

GPS-Antenna

We recommend the 3,3V or 5V Bullet III GPS antenna with TNC-connection by Trimble,

and lightning protection by Huber+Suhner (Art.Nr. 3406.19.0003).

Fig. 5-9: GPS antenna by Trimble (l.) and lightning protection by Huber+Suhner (r.)

Important: The GPS antenna should fulfil the following conditions:

 Only active GPS antennas may be connected (no passive GPS antennas).

 The GPS antenna should be capable of operating at voltages of 3,3V or 5V.

 The maximum current draw of the GPS antenna may not exceed 35mA.

 No combined GPS/GSM antenna may be used.

 The antenna should have a bandwidth of 1575MHz +/- max. 5MHz (usually in the

+/- 2MHz area).

 The GPS signal should have a minimum total gain of 5dB between GPS antenna

and GPS receiver card.

The GPS antenna by Trimble has a TNC connection and the GPS receiver card has an

SMA connection. The HF connection cable should therefore be assembled with an SMA

and TNC connector.

Fixture

An antenna fixture such as that by Glomex may be used. It is made of stainless steel with

thread for coupling nut 1" / 14 and is designed for horizontal and vertical antenna assembly

for tubes between 30mm and 80mm diameter.