Nautel FM10, Technical Instructions

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10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 3-12
15 July 1997
Table 3-2 Control/Monitor Function Controls and Indicators (Continued)
PANEL MARKING/
REF FIG NOMENCLATURE FUNCTION
DES NO. USED IN TEXT
A13A1DS9 MD-7
MD-8 REFLD PWR ALARM When turned on, indicates a reflected power in excess
of 100 watts is/was being reflected back to the output
of the RF power amplifier modules. Latching circuit
maintains turned on state when reflected power is
restored to an acceptable level.
A13A1DS10 MD-7
MD-8 IPA INPUT ALARM When turned on, indicates exciter's RF output level
is/was outside allowable limits for the IPA module.
Latching circuit maintains turned on state when RF
drive is restored to an acceptable level.
A13A1DS11 MD-7
MD-8 IPA OUTPUT ALARM When turned on, indicates IPA module's RF output
is/was less than 80% of the optimum RF drive level
for the RF power amplifier modules. Latching circuit
maintains turned on state when intermediate RF is
restored to an acceptable level.
A13A1DS12 MD-7
MD-8 IPA SWR ALARM When turned on, indicates a load impedance
mismatch, at output of IPA (intermediate power
amplifier) module, caused by one of the following:
- intermediate RF's reflected power was in excess
of 160 watts.
- intermediate RF's forward power was in excess
of 600 watts.
Latching circuit maintains turned on state when cause
of alarm has been removed and operation has returned
to normal.
A13A1DS13 MD-7
MD-8 IPA TEMP ALARM When turned on, indicates temperature inside the IPA
module is/was in excess of 73
°
C.
Latching circuit maintains turned on state when cause
of alarm has been removed and operation has returned
to normal.
A13A1DS14 MD-7
MD-8 REMOTE (CONTROL) Turns on when
REMOTE CONTROL
switch S5 has
been pressed and the on/off status of the RF power
stage is being controlled remotely.