TELEVISION TRANSMISSION BAND CIRCULATOR GENERAL INFORMATION * External Load Available 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. * 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 FEATURES * High Power Handling Operating Temperature Range 0 to 60 C * Closely Matched Phase NOTES * Same Compact Outline for all Three Bands Case temperature to be maintained at 60 C maximum As the three types are mechanically identical, the layout of the transmitters need not vary 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. DATA SHEET 2 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 Edition 2 Certificate No. FM25025 ISO 9001 Page 1 BLOCK DIAGRAM & MECHANICAL OUTLINE Dimensions in millimetres DATA SHEET 2 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 Edition 2 Certificate No. FM25025 ISO 9001 Page 2