Operating instructions

A-1
Appendix A
DIRECTIONAL POWER HEADS
Contents
Features......................................................................................................................................... A-7
Performance data - power head only............................................................................................. A-8
Performance data - in conjunction with 2948B .......................................................................... A-10
Additional parts associated with directional power head............................................................ A-13
Supplied ............................................................................................................................... A-13
Optional ............................................................................................................................... A-13
Using the directional power head accessory............................................................................... A-14
General................................................................................................................................. A-14
Power supply ....................................................................................................................... A-14
Procedure ............................................................................................................................. A-14
Technical description.................................................................................................................. A-16
Directional coupler assembly............................................................................................... A-16
Channel circuit..................................................................................................................... A-16
Control circuit...................................................................................................................... A-16
Power supply and oscillator................................................................................................. A-16
List of tables
Table A-1 Conversion of VSWR to return loss ......................................................................... A-13
List of figures
Fig. A-1 Power range of HF directional power head................................................................. A-11
Fig. A-2 Power range of UHF directional power head.............................................................. A-11
Fig. A-3 VSWR range for HF and UHF directional power heads............................................. A-12
Fig. A-4 Percentage to dB error conversion .............................................................................. A-12
Fig. A-5 Directional power head screen .................................................................................... A-14
Fig. A-6 Simplified block diagram of HF or UHF power head................................................. A-17