User's Manual

1
Safeguards
2
Terms and
Warranty
3
Principle of
Operation
4
Installation
5
Operation
6
Control System
7
RF Components
8
Power Supply
9
Maintenance
10
Troubleshooting
Directional Coupler
The dual directional coupler provides RF samples proportional to forward and
reflected RF power to be converted to DC voltages for monitoring. These analog
voltages are converted for processing using analog-to-digital converters and
provide the control system with valuable data for monitoring purposes. Output
power should be set following the operating procedure found elsewhere in this
manual. The directional coupler uses Type N connectors on lower power systems
and 7-16 DIN connectors are used for increased power handling capability. Other
connectors are available upon request – this connector is typically the RF output
connector on the back panel of the enclosure. On higher power systems, high
power handling connectors are used, especially in the overall output combiner.
On lower power systems, the coupler is typically based on microstrip architecture
on the exciter circuit board.
Frequency Ran
g
e 41
–
100 MHz (option A)
162 – 254 MHz (option B)
470 – 862 MHz (option C)
Max Output Powe
r
2 kW DTV (3 kW ATV)
Couplin
g
-36 to -60 dB (on any channel)
Couplin
g
variation < ±0.15 dB 162
–
254 MHz
< ±0.15 dB 470 – 862 MHz
Return Loss > 30 dB (VSWR < 1.07)
Directivity > 30 dB
Environmental Conditions -5 to +55 °C (+23 to +131 °F)
Connectors N, 7-16DIN, EIA 7/8” (dependent on power level)
Frequency Ran
g
e 41
–
100 MHz (option A)
162 – 254 MHz (option B)
470 – 862 MHz (option C)
Max Output Powe
r
20 kW DTV (30 kW ATV)
Couplin
g
-48 to -72 dB (on any channel)
Couplin
g
variation < ±0.15 dB 162
–
254 MHz
< ±0.15 dB 470 – 862 MHz
Return Loss > 30 dB (VSWR < 1.07)
Directivity > 30 dB
Environmental Conditions -5 to +55 °C (+23 to +131 °F)
Connectors EIA 1-5/8” or 3-1/8”(dependent on power level)