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73-67-25 Series
T-Pass, Transmit Combiners
73-67-25 Series

73-67-25 Series, 406-512 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.

Models
  • 73-67-25-2B-nn
  1. -nn in model number represents the number of channels.
  2. These specifications are applicable to 406-512 MHz models.
  3. Models available with 5W/60W loads. Same specifications as 25W and 100W models, except load power.
  4. -MC option reduces maximum number of channels to ten 10-inch or 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).
73-67-25 Series Systems (10"Cavity Diameter)
Tx-Tx Sepration Cavity Loss Maximum Power
1 MHz -1.5 dB 150 W
250 kHz -1.5 dB 150 W
125 kHz -2.0 dB 150 W
75 kHz -2.5 dB 125 W

Loss (dB) vs. No. of channels
Tx-Tx Sepration 2 4 8 12
1 MHz -2.4 -2.5 -2.8 -3.1
250 kHz -2.7 -3.2 -3.7 -4
125 kHz -3.4 -4.4 -5.0 -5.5
75 kHz -4.3 -5.6 -6.6 -7.1
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T-Pass, Transmit Combiners
73-67-25 Series
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product specifications:
Item No
73-67-25 Series
Item Name
406-512 MHz, T-Pass Combiner, 10" Cavity
Frequency Range
406-512 MHz
Cavity Type and Diameter
3/4-wave, 10” (254 mm)
Maximum Continuous Transmit Power
150 W
Isolator Load Pwr Continuous
5 W/25 W [Note 3]
Min Tx-Tx Separation at Cavity Loss
150 kHz @ -1.5 dB
75 kHz @ -2.5 dB
Typical Tx-Tx Isolation at Min Separation
Typical Antenna - Tx Isolation
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
12 [Note 4]
Dimensions
79.5” x 24” x 36” (H x W x D) [Note 6]
(2019 x 610 x 914 mm)
Weight - Basic Single Channel
14 lbs. (18.6 kg)
Weight - Expansion Channel Assy
19 lbs. (8.6 kg)
compatible devices:
21-65-25-xx-T Series
406-430 MHz, T-Pass Expansion Channels
21-70-25-xx-T Series
450-470 MHz, T-Pass Expansion Channels
21-71-25-xx-T Series
470-490 MHz, T-Pass Expansion Channels
21-72-25-xx-T Series
490-512 MHz, T-Pass Expansion Channels
21-75-25-xx-T Series
510-530 MHz, T-Pass Expansion Channels
accessories:
93-00 Series
T-Pass, Transmit Combiner Racks