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73-56-11 Series
T-Pass, Transmitter Multicoupler Expansion Channels
73-56-11 Series

73-56-11 Series, 380-420 MHz, T-Pass® Combiners
Broadband architecture of the T-Pass® circuit and coaxial cavities mitigates equipment obsolescence and facilitates ease of system reconfiguration when re-banding is necessary. Each System configured for optimum performance. Ideal for applications with minimal guard band between transmit and receive frequencies.

  1. -nn in model number represents the number of channels.
  2. These specifications are applicable to 380-420 MHz models.
  3. Models available with 5W/60W loads. Same specifications as 100W models, except load power.
  4. -MC option reduces maximum number of channels to twelve 6.625-inch channels per rack.
  5. -LR systems are tuned and tested on customer frequencies, then disassembled for shipping.
  6. Rack depth with cavity tuning rods at maximum frequency. Rod travel is approximately 5.1" (130 mm).
Expansion Channel Specifications
Model Freq. Range (MHz) Isolator Power Isolator Loads Expansion Channel Model Number Starter Channel Model Number
73-56A-11-xx 380-400 150 W See note above 21-56A-11-xx-T 21-56A-11-xx-TS
73-56B-11-xx 400-420 150 W See note above 21-56B-11-xx-T 21-56B-11-xx-TS

Note: "xx" in model number describes isolator and load configuration: 2B = 5 W/100 W


Typical Insertion Loss and Maximum Input Power a
Tx-Tx Sepration Cavity Loss Maximum Power
1 MHz -1.5 dB 150 W
250 kHz -1.5 dB 150 W
150 kHz -2 dB 125 W

Loss (dB) vs. No. of channels
Tx-Tx Sepration 2 4 8 12
1 MHz -2.4 -2.6 -2.9 -3.1
250 kHz -2.9 -3.8 -4.4 -4.7
150 kHz -3.6 -4.8 -5.6 -6.0
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T-Pass, Transmitter Multicoupler Expansion Channels
73-56-11 Series
product specifications:
Item No
73-56-11 Series
Item Name
380-420 MHz, T-Pass Combiner, 6.625" Cavity
Frequency Range
380-420 MHz
Cavity Type and Diameter
3/4-wave, 6.625” (168 mm)
Maximum Continuous Transmit Power
125 W
Isolator Load Pwr Continuous
5 W/100 W [Note 3]
Min Tx-Tx Separation at Cavity Loss
150 kHz @ -2.0 dB
Typical Tx-Tx Isolation at Min Separation
80 dB
Typical Antenna - Tx Isolation
70 dB
Typical Tx Noise Suppression
Depends on cavity loss
Impedance Ω
50
Maximum Input Return Loss - VSWR
-20 dB (1.22:1)
Temperature Range
-30 to +60 °C
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 37.5” (H x W x D) [Note 6]
(1659 x 610 x 953 mm)
Weight - Basic Single Channel
37 lbs. (16.7 kg)
Weight - Expansion Channel Assy
16 lbs. (7.2 kg)
accessories:
93-00 Series
T-Pass, Transmit Combiner Racks