Tech Bulletin:

Cel-Fi External Antenna Option Version 1.0

Technical Guide

Selecting an Antenna

All RS2 Cel-Fi models have identical External Antenna Specifications. Select a suitable antenna to cover all UMTS bands your Cel-Fi model supports (See table 1 for frequencies by Band).

General Specification:

Indoor Installation Outdoor Installation

Max realized gain* (dBi) 5 5

Frequency Range (MHz) See Table 1 Same

VSWR 1

Beamwidth () 90 360 (Omni or Directed)

Front-to-back Ratio (dB) >15 N/A if Omni

Connector SMA SMA

Install type Professional Professional

Install Instructions Point away from CU and towards donor cell

Install as far away from CU as possible. If not Omni antenna, point to donor cell. Measure RSSI at antenna location and ensure level is below -45dBm.

UMTS Band Frequencies (Note that some Cel-Fi systems support more than one band. Therefore, a suitable antenna must be select-ed to cover all supported bands.

UMTS Band Uplink (MHz) Downlink (MHz)

Band 1 19201980 21102170

Band 2 18501910 19301990

Band 4 17101755 21102155

Band 5 824 - 849 869 - 894

Band 8 880 - 915 925 - 960

* Realized Gain = Antenna Gain Cable loss

Table 1

TB_AntennaSpec_12_0712

Antenna Installation

Outdoor antennas are normally not necessary with a Cel-Fi system. But if an External Antenna is desired, following these simple rules will help guarantee a successful outcome.

Follow the antennas manufacturers instructions for antenna installation. If the antenna is to be installed indoors, it should be a directed antenna (not Omni-

Directional) or system performance may be impacted. If the antenna is to be installed outdoors, it may be Omni-Directional or Directed. Omni-Directional antennas should be installed as high as possible (above the Coverage Unit)

for best system performance. Directed antennas should be pointed towards the donor cell site, and positioned such that

they are facing away from the Coverage Unit. Higher is usually best we well.

Antenna Cable Installation

Attach the antenna cable to the underside of the Window Unit, and install the feed cable according to the antenna manufac-turers instructions.

The total antenna system gain (antenna gain minus feed loss) spec is 5 dBi maximum. Note that lower loss cables may be run over longer distances, but lower loss cables are generally larger and less bendable. It may be easier to use a smaller more bendable jumper cable on the Cel-Fi side of the antenna feed for easier installation.

As shown in the photo to the right, a 90 Degree SMA adapter may be useful if the antenna feed is stiff and does not connect easily to the Cel-Fi antenna port.

How Cel-Fi Functions with an External Antenna Connected

The Cel-Fi Window Unit has four internal antennas that it selects from, based on optimal perfor-mance. If an external antenna is connected, it acts as a fifth antenna. If the External Antenna is de-termined to be the best antenna option, the Status Light on the Window Unit will illuminate Orange.

A lack of an Orange Status Light may indicate a faulty External Antenna or Feed cable.