User Manual

Table Of Contents

Axell BSR 3308-PS NFPA

Product Description and User’s Manual

3.6 Grounding

NOTE: Refer to section 3.1.6 for the grounding requirements.

WARNING! Do not use the grounding bolt to connect external devices.

To ground repeater

Connect main ground to Repeater grounding lug.

3.7 Before Connecting the Antennas or Power

Before connecting the antennas or power perform the following procedures described in

this section:

• Verify isolation between the donor and mobile antennas

• Verify link between the BTS and the Repeater

3.7.1 Verifying Isolation between Donor and Mobile Antennas

The isolation between the Base/Donor and Mobile/Service antennas is critical.

• For proper operation of the Repeater, it is recommended that the isolation between

the Donor and Service antennas be at least 15dB higher than the Repeaters set gain.

• Insure proper vertical or horizontal distance separation between Donor and Service

antennas

NOTE: Lower isolation can lead to high in-band ripple, oscillations and low signal quality.

To measure the isolation, proceed as follows:

1. Inject a known signal from a signal generator into one antenna (preferably the

Donor antenna).

2. Measure the coupled output from the Service antenna, using the Spectrum analyzer

and LNA if applicable.

3. Perform this procedure across the frequency range of both the Uplink and Downlink

bands.

4. Register the lower result for system operation.

Grounding lug