User Manual

ALLGON SYSTEM AB - Proprietary
Technical Specification for PCS Tower Top Power Amplifier [Allgon 9256]
Preliminary
-
Subjected
to change without notice
Rev.pA0
File: 93651
Page 8 (19) 29 Mar 00
3.2.5 Supervision
A number of parameters are constantly supervised.
TX Power Amplifier:
Output power, VSWR (when input power within specified limits), transistor currents, voltages,
temperature and power supply. VSWR supervision optional.
RX LNA:
Transistor currents and power supply.
Control unit:
The system controller at startup and at certain intervals makes a system self-test.
3.2.6 Alarming
The TTPA has an alarm connector with two independent relay contacts and an auxillary input.
The Relays are assigned to different alarms depending on whether it is a Major or Minor alarm
(Relay 1=Major, Relay 2=Minor).
This facilitates differentiation of minor alarms (not interrupting transmission) from major alarms
that indicates loss of transmission. All alarms can be gated to one by simply connecting the
contacts in parallel.
ALARM Cause Action in TTPA Relay #
Overtemp Cooling flange above 80°C** RX_bypass****/TX Bypass**** 1
DC-Minor One DC/DC-converter failed none 2
DC-Major**** No DC power to TTPA * TX Bypass 1
TX-Minor One PA Transistor failed None 2
TX-Major PA Failure, No Gain PA shutdown & TX Bypass 1
RX-Minor One LNA Transistor failed None 2
RX-Major LNA Failure none 1
VSWR Alarm***
*
VSWR > 2.5:1*** none 2
OP-Alarm Output Power over Limit none 2
IP-Alarm Input Power over Limit none 2
RP-Alarm**** Reflected Power over Limit none 2
AGC-Alarm Gain control failed Gain accuracy reduced 2
AUX-Alarm**** Auxillary input shorted none1 2
TTA_Minor**** Diversity TTA minor failure none 2
TTA_Major**** Diversity TTA major failure none 2
SYS_Minor CPU System test failed none 2
SYS_Major CPU System test failed TX Bypass**** 1
* Either due to failure of both DC/DC converters, or no DC power applied to the unit.
** restart at +60°C
*** Default value. Software changeable level 2:1 to 5:1 is optional