User Manual

Mission Valley Radio Repeater Equipment + Upgrade
User/Maintenance Handbook
Handbook No. 50-078021HBKM Page 42 of 85
3.14.1 Description
The purpose of the VHF combiner is to take the downlink products of all the VHF shelves and
combine them together so that they may, in turn, be combined with the 800MHz signals from the
cellular amplifiers to feed the tunnel antennas. The reverse is true of the uplink path where the VHF
signals from each of the tunnel antennæ are coupled from the 800MHz signals, filtered, amplified,
combined and then split equally for the inputs of the VHF uplink amplifiers.
The uplink low-noise-amplifier used in the shelf, has an alarm pair, configured as a summary, volt-free
relay contact pair terminating at pins 1 & 2 on the ‘D’ type alarm connector.
3.14.2 Technical Specification
PARAMETER SPECIFICATION
Frequency ranges: 160-162MHz (D/L, U/L)
VSWR: better than 1.5:1
Shelf size: 3U
Uplink amplifier gain: 20dB (typical)
Rejection: >30dB
RF connectors: N type, female
operational:
-20°C to +60°C
Temperature
range
storage:
-40°C to +70°C
Case: Alocrom 1200/Iridite NCP
Heatsinks: None
Handles: Aluminium alloy
Finish
Fascia: Painted to RAL 7035
Alarms Fitted: ‘D’ connector, pins 1& 2
3.14.3 Parts List
AFL Part # Part Description Qty.
01-002503 FILTER VHF H/B 6 SMA S 100W 2
05-002901 3dB BROADBAND SPLITTER SMA 1WATT 1
07-005401 160-470MHz 3 WAY SPLITTER 4
11-006002 LNA VHF 70-500MHz WITH RELAY 1
13-001803 DUAL DC/DC CONVERTER 24V-12V 1A 1
19-000826 2U,3U,4U 19" UNIT 400 DEEP LID 1
19-000921 3U 19" UNIT 400 DEEP CHASSIS + BKT 1
80-024203 TRANSMITTER HYBD COUPL.3 PORT 2
80-063627 3U FRONT PANEL FOR H/S 80-063920 1
91-030002 N ADAPTOR PANEL FEMALE:FEMALE 15
91-500001 POWER PLG 3 PIN PNL.MOUNT NC-X 1
91-510003 3 PIN R.ANGLE FREE SOC.NC-X. 1
93-540035 1K3 0.25W 1% RES MRS25 M:F 2
96-110001 FUSE HOLDER 20 x 5mm6.3A 1
96-700034 LED RED 5mm IP67 INTEGRAL RES. 24V 1
96-700035 LED GREEN 5mm IP67 INTEGRAL RES 24V 1
97-400005 HANDLE TYPE H6802 3U [ALLOY] 2