TELEVISION-TRANSMISSION-BAND-C - DML Microwave Ltd.

TELEVISION TRANSMISSION BAND CIRCULATOR

Page 1

Chandlers Way, Temple Farm Industrial Estate,

Southend-on-Sea,Essex SS2 5SE

Phone: +44 (0) 1702 463440

Fax:+44 (0) 1702 463670

email: sales@dmlmicrowave.co.uk

www.dmlmicrowave.com

DATA SHEET 2 Edition 2

GENERAL INFORMATION

This range of circulators is designed for amplifier protection

in solid state television transmitters. Their purpose is to

protect amplifiers whose outputs are to be combined to

produce high power. Each device is phase matched to ensure

that the combined power is produced as efficiently as

possible. The circulators will withstand a full 200 Watt

continuous wave into a short or open circuit. This gives the

amplifier the highest possible level of protection. The phase

matching specification is maintained over the full temperature

range. All production devices will have insertion phase spread

within a 16° window.

As the three types are mechanically identical,the layout of the

transmitters need not var y to accommodate different bands.

Moreover,they are constructed using common materials and

designs. This allows maximum flexibility when ordering. These

high quality components are already in volume production.

FEATURES

•High Power Handling

•Closely Matched Phase

•Same Compact Outline for all Three Bands

•External Load Available

•Mechanically and Electrically Robust

SPECIFICATIONS

Frequency Range (Low Band) 470 - 580 MHz

(Mid Band) 570 - 710 MHz

(High Band) 700 - 860 MHz

Insertion Loss 0.4 dB

Isolation 20 dB

VSWR (All Ports) 1.25:1

Power Rating 200 Watt CW

Impedance 50 W

Phase Matching +/- 8 ° of Nominal

Operating Temperature Range 0 to 60 °C

NOTES

Case temperature to be maintained at 60 °C maximum

Certificate No. FM25025

ISO 9001