Bird Technologies 73-67-25 Series - Manual (Page 8)

TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 2
Table 1: General specifications for 6.625” cavity system.
Frequency Range (MHz) 406 - 512 MHz
Cavity Type and Diameter 3/4 wave, 6.625” (168 mm)
Maximum Continuous Transmit Power 150 Watts
Isolator Load Power (Continuous) 73-67-11-2B-nn: 5W/25W [Note 3] ; 73-67-11-2D-nn: 5W/100W
Minimum TX-TX Separation at Cavity Loss 215 KHz @ -1.5 dB ; 115 KHz @ -2.5 dB
Typical TX-TX Isolation at Minimum Separation (dB) 80 dB
Typical Antenna - TX Isolation (dB) 70 dB
Typical TX Noise Suppression depends on cavity loss
Nominal Impedance (Ohms) 50
Maximum Input Return Loss (VSWR) -20 dB (1.22:1)
Temperature Range (°C) -30 to +60
Connectors, Input and Antenna N
Mounting Peg Rack ®
Mounting Options
MC: 19” rackmount adapter plates, 17.5” high
LR: System supplied without Peg Rack ® [Notes 4,5]
Maximum Channels / Rack 15 [Note 4]
Dimensions 65.25” x 24” x 36” (H x W x D) [Note 6] ; (1659 x 610 x 914 mm)
Weight - Basic - Single Channel [lb (Kg)] 73-67-11-2B-nn: 36 (16.3) ; 73-67-11-2D-nn: 37 (16.7)
Weight - Expansion Channel Assembly [lb (Kg)] 73-67-11-2B-nn: 15 (6.8) ; 73-67-11-2D-nn: 16 (7.2)
Note 1: -nn in model number represents the number of channels.
Note 2: These specifications are applicable to 406 - 512 MHz models.
Note 3: Models available with 5W/60W loads. same specifications as 25W and 100W models, except load power.
Note 4: -MC option reduces maximum number of channels to ten 10-inch or twelve 6.625-inch channels per rack.
Note 5: -LR systems are tuned and tested on customer frequencies, then disassembled for shipping.
Note 6: Rack depth with cavity tuning rods at maximum frequency. Rod travel is approximately 5.1” (130 mm).
0
-5
Atten
uation (dB)
-10
-15
-20
-25
-30
-35
-40
-45
-50
0.01 0.1 1
Offset from Fo (MHz)
10
73-67-11-Series Systems
6.625" Diameter 3/4-Wave, Fo = 460 MHz
IL = 1.0 dB
IL = 1.5 dB
IL = 2.0 dB
IL = 2.5 dB
IL = 3.0 dB
Figure 2: Typical transmitter noise suppression using 6.625” cavities.