Tait TEL0061 Exciter Specification

C1.8

T856/857 General Information

M850-00

1.2 Specifications

1.2.1 Introduction

The performance figures given are minimum figures, unless otherwise indicated, for
equipment tuned with the maximum switching range and operating at standard room

temperature (+22°C to +28°C) and standard test voltage (13.8V DC).

Where applicable, the test methods used to obtain the following performance figures
are those described in the EIA and ETS specifications. However, there are several
parameters for which performance according to the CEPT specification is given. Refer
to Section 1.2.6 for details of test standards.

Details of test methods and the conditions which apply for Type Approval testing in all
countries can be obtained from Tait Electronics Ltd.

The terms "wide bandwidth", "mid bandwidth" and "narrow bandwidth" used in this
and following sections are defined in the following table.

Channel Spacing

Wide Bandwidth 25kHz ±5.0kHz 15.0kHz

Mid Bandwidth 20kHz ±4.0kHz 12.0kHz

Narrow Bandwidth 12.5kHz ±2.5kHz 7.5kHz

Modulation

100% Deviation

Receiver

IF Bandwidth

1.2.2 General

Number Of Channels .. 128 (standard)

Supply Voltage:

Operating Voltage .. 10.8 to 16V DC
Standard Test Voltage .. 13.8V DC
Polarity .. negative earth only
Polarity Protection .. crowbar diode
Line Keying Supply (if required) .. -50V DC

Supply Current:

1

Transmit - T856 .. 5.5A (typical)

- T857 .. 750mA

Standby - T856 .. 165mA (typical)

- T857 .. 150mA (typical)

Operating Temperature Range .. -20°C to +60°C

1. Additional channels may be factory programmed. Contact your nearest Tait Dealer or
Customer Service Organisation.

29/02/00 Copyright TEL

M850-00

T856/857 General Information

Dimensions:

Height .. 183mm
Width .. 60mm
Length .. 322mm

Weight .. 2.1kg

1

Time-Out Timer (optional) .. 0 to 5 minutes

adjustable in 10 sec-

ond steps

C1.9

Tail Timer .. 0 to 5 seconds adjustable in 100ms

2

steps

Transmit Key Time .. <30ms

Transmit Lockout Timer .. 0 to 1 minute adjustable in 10 second

steps

1.2.3 RF Section

Frequency Range .. 400-520MHz (refer to Section 1.4 and

Section 1.5)

Modulation Type .. FM

Frequency Increment .. 5 or 6.25kHz

Switching Range .. 8MHz (i.e. ±4MHz from the centre

frequency)

Load Impedance .. 50 ohms

Frequency Stability .. ±1ppm, -20°C to +60°C

(see also Section 1.4 and Section 1.5)

Adjacent Channel Power (full deviation):

Wide Bandwidth (WB) .. -75dBc
(±25kHz/15kHz B/W)

Mid Bandwidth (MB) .. -70dBc
(±20kHz/12kHz B/W)

Narrow Bandwidth (NB) .. -65dBc
(±12.5kHz/7.5kHz B/W)

Transmitter Switching .. complies with ETS 300 113

1. Adjustable from 0 to 10 minutes in PGM800Win version 2.12 and later.

2. Adjustable in 20ms steps in PGM800Win version 2.12 and later.

Copyright TEL 29/02/00