Tait T855 User Manual

D3.8 T858/859 Initial Adjustment M850-00
31/09/98 Copyright TEL
3.7 Remote Forward Power Meter Calibration
If a remote meter is connected, adjust RV43 (forward power meter calibration con-
trol) for the remote reading to agree with the RF power meter reading.
3.8 Remote Reverse Power Meter Calibration
If a remote meter is connected, connect a 50 ohm 3dB pad (with the output open
circuit) to the PA output.
Apply RF drive and Tx-Key.
Adjust RV57 (reverse power meter calibration control) for a quarter of the forward
power reading.
3.9 Setting Alarm Levels
Note:
If forward and reverse power metering is being used, set up their calibration
(Section 3.7 and Section 3.8) before setting the alarm levels.
3.9.1 Forward Power
Power up the T858/859 and adjust RV63 (front panel power control) so that the
output power is at the alarm level required (e.g. 40W if the PA normally operates
at 50W).
Adjust RV48 (forward power alarm set) so that the forward power alarm LED
lights.
Check the alarm level setting by adjusting the power up and down and observing
the alarm LED. A few watts hysteresis can be expected.
Readjust RV63 for the normal operating level.
Note:
Remote indication is available at D-range pin 3.
3.9.2 Reverse Power
Power up the T858/859 and adjust RV63 (front panel power control) for the nor-
mal operating power level.
Place a known mismatch of the required value (e.g. 3:1 VSWR) and adjust RV52
(reverse power alarm set) so that the reverse power alarm LED lights.

Tait T855 Specifications

General

Brand	Tait
Model	T855
Category	Accessories
Language	English