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 14 (19) 29 Mar 00
3.6.8 RX Stability
The RX-amplifier is unconditionally stable for all loads at input and output of the TTPA.
3.6.9 RX Redundancy
In the event of failure of one of the transistors in the balanced LNA the gain will drop by approx.
6dB. An RX-minor alarm will be generated. If both transistors fail, an RX-major alarm will be
generated.
3.7 F
ILTER
P
ARAMETERS
Rx and Tx bands according to paragraph 2.1
Isolation ANT to LNA input
DC – 1000 90 dB
1000 – {35 MHz below Rx Band} 30 dB
1910 – 1990 50 dB
Tx Band (20 MHz wide) 85 dB
1990 – 5970 40 dB
5970 – 12750 20 dB
3.8 P
OWER
S
UPPLY
P
ARAMETERS
3.8.1 Supply Voltage
- 48 Volts DC
3.8.2 Supply Voltage Tolerance
Measured at BTS port.
Max: -60V
Min: -40 V
3.8.3 Supply Voltage Noise Tolerance
! Ripple and noise 10Hz to 100 MHz: 100 mVp-p
! Wideband noise 4kHz to 20 MHz, any 3kHz band: 1V p-p
3.8.4 DC/DC Redundancy (option 4)
The power supply consists of two DC/DC converters in parallel, sharing the current. In the case
off one converter failing, the remaining converter will power the unit to full operation. An alarm
(DC-minor) will be signaled to the PDU. If both DC/DC converters fails, or no power is applied to
the unit, the APDU detects this automatically and raises an alarm.
3.8.5 DC Input Protection
! Reverse Voltage Protection
! Over voltage Protection ( see lightning spec.)
! Over current protection