Delta Electronics CPB-1

This version of the Delta CPB-1 comes without panel for mounting directly on the phasor panel (drill template supplied).

The Delta Electronics CPB-1 Common Point Impedance Bridge is an operating impedance bridge designed for permanent installation in the phasing equipment at the antenna common point. The CPB-1 operates with common point power up to 5 kW with 100% amplitude modulation on a continuous basis. It features two 4" dials calibrated directly in resistance and reactance. A front panel meter operates as a null detector. The R and X dials are manipulated as a normal bridge to give a null indication on the panel meter while the transmitter is operating at full or reduced power. The value of the common point resistance and reactance are then read directly from the two dials. _

Many directional antennas have common point impedances that vary from time to time due to seasonal drift of the antenna parameters. The Common Point Bridge permits the station operator to determine the common point impedance at all times, even during normal operating hours. By minor adjustment of the common point resistance control, the station can maintain radiated power at the full license value at all times. Changes in the antenna system that affect the common point impedance are easily detected with the Common Point Bridge.

• Frequency Range: 500 kHz to 1.65 MHz

• Power Rating (at 100% amplitude modulation continuous): 5 kW

• Resistance Range: 30 to 100 ohms

• Reactance Range: ±50 ohms at 1 MHz

• Accuracy: Resistance: ±2% ±1 ohm; Reactance: ±2% ±1 ohm (Provision is made for your consultant to adjust the calibration to agree exactly with your licensed resistance value)

• RF Source: Transmitter operating at normal or reduced power acts as source, no generator is required

• Detector: Tuned internal detector with 25 µA panel meter; BNC output connector for use with external detector

• Terminals: No. 10-32 Screw Terminals

• Mounting: Mounts directly on the phasor panel (drill template supplied)

• Dimensions: 7" high x 19" wide x 10" deep