User's Manual

Bronx Justice Centre Radio Repeaters
Handbook Number: 80-283501HBKM Page: 16 of 86
4.1.6.1Description
This shelf receives the single uplink RF from the antenna(s) and, similar to the downlink, one of the
five channels is substantially different in frequency to the other four. This means that channel 1 is
routed through a dedicated bandpass filter and the other four signals together also use a single filter.
The output of this ‘four-way’ signal path is then split to four individual crystal filters, which, together
with channel 1 path form the five uplink inputs to the five VHF amplifying shelves. Channel 1 signal
needs no crystal filter as its single bandpass filter is tuned to a much narrower bandwidth to the filter
in the other path containing the ‘four’ frequencies. This is a passive shelf and has no connection to
the PSU and no alarms
4.1.6.2Technical Specification
PARAMETER SPECIFICATION
Height: 3U
Width: 19" (482.6mm)
Shelf
dimensions:
Depth: <450mm (excluding connectors & handles)
operational: -20°C to +60°C Temperature
range:
storage: -40°C to +70°C
Weight: <10kg
Frequency ranges passed: 153.965 to 154.980 & 158.925MHz
Impedance: 50ȍ
Humidity: 5 – 95% non-condensing
RF Connectors: N type female
Environmental protection: IP44
Case: Iridite NCP coating
Heatsinks: None
Handles: Silver anodised aluminium alloy
Finish
Fascia: Painted to RAL7035
4.1.6.3Parts List
AFL Part # Part Description Qty.
01-003105 SD NOTCH FILT.N 6 SECT.VHF H/B SMA 2
19-000922K 3U CHASSIS KIT (450mm deep) 1
91-030002 N ADAPTOR PANEL FEMALE:FEMALE 6
91-130001 SMA ADAPT 'T' ALL FEMALE 3 GHz 4
93-980195 154.755MHz CRYSTAL FILT FAN4M52500 1
93-980196 154.785MHz CRYSTAL FILT FAN4M52500 1
93-980197 154.980MHz CRYSTAL FILT FAN4M52500 1
93-980198 154.6575MHz CRYSTAL FILT FAN4M52500 1