Bird Technologies 73-67-25 User Manual
Y
OU'RE HEARD, LOUD AND CLEAR.
Installation and Operation Manual for
T-Pass® Transmit Multicouplers
73-67-11 Series and
73-67-25/25 (High Power) Series
Manual Part Number
7-9120
8625 Industrial Parkway, Angola, NY 14006 Tel: 716-549-4700 Fax: 716-549-4772 sales@birdrf.com www.bird-technologies.com
Warranty
This warranty applies for five years from shipping date.
TX RX Systems Inc. warrants its products to be free from defect in material and workmanship at the time of shipment.
Our obligation under warranty is limited to replacement or repair, at our option, of any such products that shall have
been defective at the time of manufacture. TX RX Systems Inc. reserves the right to replace with merchandise of
equal performance although not identical in every way to that originally sold. TX RX Systems Inc. is not liable for dam-
age caused by lightning or other natural disasters. No product will be accepted for repair or replacement without our
prior written approval. The purchaser must prepay all shipping charges on returned products. TX RX Systems Inc.
shall in no event be liable for consequential damages, installation costs or expense of any nature resulting from the
purchase or use of products, whether or not they are used in accordance with instructions. This warranty is in lieu of all
other warranties, either expressed or implied, including any implied warranty or merchantability of fitness. No representative is authorized to assume for TX RX Systems Inc. any other liability or warranty than set forth above in connection with our products or services.
TERMS AND CONDITIONS OF SALE
PRICES AND TERMS:
Prices are FOB seller’s plant in Angola, NY domestic packaging only, and are subject to change without notice. Federal, State and local sales or excise taxes are not included in prices. When Net 30 terms are applicable, payment is
due within 30 days of invoice date. All orders are subject to a $100.00 net minimum.
QUOTATIONS:
Only written quotations are valid.
ACCEPTANCE OF ORDERS:
Acceptance of orders is valid only when so acknowledged in writing by the seller.
SHIPPING:
Unless otherwise agreed at the time the order is placed, seller reserves the right to make partial shipments for which
payment shall be made in accordance with seller’s stated terms. Shipments are made with transportation charges collect unless otherwise specified by the buyer. Seller’s best judgement will be used in routing, except that buyer’s routing
is used where practicable. The seller is not responsible for selection of most economical or timeliest routing.
CLAIMS:
All claims for damage or loss in transit must be made promptly by the buyer against the carrier. All claims for shortages
must be made within 30 days after date of shipment of material from the seller’s plant.
SPECIFICATION CHANGES OR MODIFICATIONS:
All designs and specifications of seller’s products are subject to change without notice provided the changes or modifications do not affect performance.
RETURN MATERIAL:
Product or material may be returned for credit only after written authorization from the seller, as to which seller shall
have sole discretion. In the event of such authorization, credit given shall not exceed 80 percent of the original purchase. In no case will Seller authorize return of material more than 90 days after shipment from Seller’s plant. Credit
for returned material is issued by the Seller only to the original purchaser.
ORDER CANCELLATION OR ALTERATION:
Cancellation or alteration of acknowledged orders by the buyer will be accepted only on terms that protect the seller
against loss.
NON WARRANTY REPAIRS AND RETURN WORK:
Consult seller’s plant for pricing. Buyer must prepay all transportation charges to seller’s plant. Standard shipping policy set forth above shall apply with respect to return shipment from TX RX Systems Inc. to buyer.
DISCLAIMER
Product part numbering in photographs and drawings is accurate at time of printing. Part number labels on TX RX
products supersede part numbers given within this manual. Information is subject to change without notice.
Bird Technologies Group TX RX Systems Inc.
Manual Part Number 7-9120
Copyright © 2010 TX RX Systems, Inc.
First Printing: January 1994
Version Number Version Date
1 04/01/94
2 08/02/94
3 03/27/96
4 11/30/06
5 07/26/10
Symbols Commonly Used
WARNING
CAUTION or ATTENTION
High Voltage
Heavy Lifting
ESD Electrostatic Discharge
Hot Surface
Electrical Shock Hazard
NOTE
Important Information
Bird Technologies Group TX RX Systems Inc.
Changes to this Manual
We have made every effort to ensure this manual is accurate. If you discover any
errors, or if you have suggestions for improving this manual, please send your
comments to our Angola, New York facility to the attention of the Technical Publications
Department. This manual may be periodically updated. When inquiring about updates to
this manual refer to the manual part number and revision number on the revision page
following the front cover.
Contact Information
Sales Support at 716-217-3113
Customer Service at 716-217-3144
Technical Publications at 716-549-4700 extension 5019
Bird Technologies Group TX RX Systems Inc.
Table of Contents
General Description ........................................................................................... 1
Unpacking ............................................................................................................ 4
Installation Overview........................................................................................... 5
RF Cables and Connectors ................................................................................. 5
Intermodulation Considerations........................................................................... 5
General Installation Procedure ............................................................................ 6
Transmitter Combiner Checkout........................................................................ 7
Required Equipment ............................................................................................ 7
Procedure .......................................................................................................... 7
Measurement Accuracy..................................................................................... 7
General Tuning Information ............................................................................... 7
Tuning Specifics .................................................................................................. 8
Fine Cavity Tuning............................................................................................. 8
Procedure ........................................................................................................ 8
Cavity Tuning Tip............................................................................................. 9
Coarse Cavity Tuning ........................................................................................ 9
Procedure ...................................................................................................... 10
Retuning System to all new Frequencies .......................................................... 10
Combiner Expansion .........................................................................................11
Typical Expansion Channel Installation ............................................................. 11
Peg Rack Procedure (6.625” and 10” Cavities) ............................................... 11
Relay Rack Procedure (10” Cavities) .............................................................. 12
Relay Rack Procedure (6.625” Cavities) ......................................................... 13
Setting Cavity Insertion Loss ............................................................................. 14
Cavity Loss Setting Procedure 1 ....................................................................... 15
Required Test Equipment................................................................................ 15
Procedure for T-Pass Loop ............................................................................. 16
Procedure for BandPass Loop ........................................................................ 17
Cavity Loss Setting Procedure 2 ....................................................................... 18
Required Test Equipment................................................................................ 18
Procedure for T-Pass Loop ............................................................................. 18
Procedure for BandPass Loop ........................................................................ 20
Maintenance ....................................................................................................... 21
Isolators.............................................................................................................. 21
Table of Contents Manual 7-9120-5 07/26/10
Figures and Tables
Figure 1: Block diagram of typical system ............................................................ 1
Figure 2: Noise suppression graph for 6.625” cavities .......................................... 2
Figure 3: Noise suppression graph for 10” cavities ............................................... 3
Figure 4: Typical Peg rack model .......................................................................... 4
Figure 5: Typical 19” Relay rack model ................................................................. 4
Figure 6: Typical combiner installation .................................................................. 5
Figure 7: Measuring T-Pass channel performance ............................................... 6
Figure 8: T-Pass cavity fine tuning ........................................................................ 8
Figure 9: T-Pass cavity tuning controls .................................................................9
Figure 10: Coarse tuning a T-Pass cavity ........................................................... 10
Figure 11: Peg rack mounting details .................................................................. 12
Figure 12: Relay rack mounting details ............................................................... 13
Figure 13: Top view of T-Pass cavity .................................................................. 14
Figure 14: Setting loop adjustment reference...................................................... 16
Figure 15: Setting T-Pass loop using step attenuators........................................ 17
Figure 16: Setting BandPass loop using step attenuators................................... 18
Figure 17: Setting T-Pass loop insertion loss ...................................................... 19
Figure 18: Setting Bandpass loop insertion loss .................................................20
Table 1: General specifications 6.625” cavity systems.......................................... 2
Table 2: General specifications for 10” cavity systems ......................................... 3
Table 3: Cavity insertion loss reference loop settings ......................................... 15
Appendix A
UHF Isolators (Compact style)
General Description .......................................................................................... 22
Installation.......................................................................................................... 22
Verifying Isolator Functionality ........................................................................ 22
Recommended Test Equipment ...................................................................... 22
Measuring Reverse Isolation (S12) ................................................................... 22
Measuring Insertion loss (S21) .......................................................................... 23
Figure A1: Verifying Reverse Isolation ...............................................................23
Figure A2: Verifying Insertion Loss .................................................................... 23
Figure A3: Typical Reverse Isolation Waveform ................................................ 24
Figure A4: Typical Insertion Loss Waveform...................................................... 24
Table A1: Specifications .................................................................................... 25
Table of Contents Manual 7-9120-5 07/26/10
GENERAL DESCRIPTION
T
T
T
T
T
The model 73-67-11/25-XX-NN Series T-Pass
Transmit Combiners are designed to connect multiple transmitters to a common antenna. They use
three-port bandpass filters (called T-Pass cavities)
and ferrite isolators to provide low channel insertion loss, high isolation between transmitters, high
antenna-to-transmitter isolation, high intermodulation suppression, and excellent transmitter noise
suppression. T-Pass transmit combiners are
broadband and easily adaptable to the most difficult duplex system design requirements.
Transmitter Combiner (T-Pass)
X5
The block diagram of a typical transmit combiner is
shown in Figure 1. The T-Pass filter passes one
X4
narrow band of frequencies and attenuates all others with increasing attenuation above and below
the pass frequency. The T-Pass filter has a “dualport” output loop plate which allows the filter to be
easily connected to other T-Pass filters. Connections between the filters are made with a “thru-line”
cable that behaves like a low loss 50 Ohm transmission line. The thru-line cables are individually
optimized to their own channel frequency. No com-
X3
promises are necessary to accommodate other
channel frequencies. Each channel can therefore
be anywhere in a very broad frequency range.
An isolator is added at the input to each T-pass
channel to increase channel isolation. The ferrite
isolators will isolate the transmitter from unwanted
signals that enter the system via the antenna. The
X2
transmitter sees an excellent impedance match on
its output, because the isolator absorbs reflected
power that would otherwise enter the transmitters
output stage. This improves the stability, spectral
purity and long-term reliability of the transmitter.
The model 73-67-11/25-XX-NN Series T-Pass
transmit combiners are available with either 6.625”
or 10” cavities. TX combiners constructed with
X1
6.625” cavities are ideal for operation at channel
separations of 115 KHz or more, with 110 to 150
Watt transmitters. These models are suitable for
19” relay rack mounting or TX RX peg rack mounting. TX combiners constructed with high perfor-
S
mance 10” diameter cavities, which have higher
selectivity and power handling capabilities, allow
operation at 75 KHz minimum separation with 125
to 150 Watt transmitters. In addition, High power
10” diameter models are also available which contain 250 Watt dual isolators with 100 or 250 Watt
loads.
TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 1
Figure 1: Block diagram of a typical TX T-Pass
combiner. Typical five channel system shown as
an example.
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
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 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).
Note 2: These specifications are applicable to 406 - 512 MHz models.
MC: 19” rackmount adapter plates, 17.5” high
LR: System supplied without Peg Rack ® [Notes 4,5]
Tab l e 1 : General specifications for 6.625” cavity system.
73-67-11-Series Systems
0
-5
-10
-15
-20
6.625" Diameter 3/4-Wave, Fo = 460 MHz
-25
-30
Attenuation (dB)
-35
IL = 1.0 dB
IL = 1.5 dB
IL = 2.0 dB
-40
IL = 2.5 dB
IL = 3.0 dB
-45
-50
0.01 0.1 1
10
Offset from Fo (MHz)
Figure 2: Typical transmitter noise suppression using 6.625” cavities.
TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 2
Frequency Range (MHz) 406 - 512 MHz
Cavity Type and Diameter 3/4-wave, 10” (254 mm)
Maximum Continuous Transmit Power 150 Watt
Isolator Load Power (Continuous) 5W/25W [Note 3]
Minimum TX-TX Separation at Cavity Loss 150 KHz @ -1.5 dB ; 75 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
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 [lb (Kg)] 14 (18.6)
MC: 19” rackmount adapter plates, 17.5 “ high
LR: System supplied without Peg Rack ® [Notes 4,5]
Weight - Expansion Channel Assembly [lb (Kg)] 19 (8.6)
Note 1: -nn in model number represents the number of channels.
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).
Note 2: These specifications are applicable to 406 - 512 MHz models.
Table 2 : General specifications for 10” cavity systems.
73-67-25-Series Systems
0
-5
-10
-15
-20
-25
-30
Attenuation (dB)
-35
-40
-45
10" 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
-50
0.01 0.1 1
10
Offset from Fo (MHz)
Figure 3: Typical transmitter noise suppression using 10” cavities.
TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 3
The TX combiners can be expanded one channel
at a time with factory-tuned, easy-to-install expansion channel assemblies. Expansion is usually
accomplished without modifications to the existing
system, and usually amounts to nothing more than
placing a new channel assembly, or several, on top
of the existing system. New channel frequencies
can be above, below, or between existing channel
frequencies.
The number of channels in the combiner is indicated by the last two digits of the model number in
place of the NN designation. All of the information
for both installation and expansion is included in
this manual. The combiner is easy to install and
has been factory tuned in most cases so that no
adjustments are necessary. The specifications for
the 73-67-11/25-XX-NN family of T-Pass combiners are listed in Tables 1 and 2 for the 6.625” and
10” cavities respectively. The curves shown in Fig-
ures 2 and 3 show the typical transmit noise suppression for the 6.625” and 10” cavity systems
respectively. Noise suppression depends on the
cavity’s loss setting. Figure 4 shows a typical Peg
rack model and Figure 5 shows a typical 19” rack
mount model.
UNPACKING
It is important to visually inspect the system components for any shipping damages as soon as possible after taking delivery. It is the customers
responsibility to file any necessary damage claims
with the carrier.
Figure 4: Example of typical Peg-rack model
using 10” cavities.
TX RX Systems Inc. Manual 7-9120-5 07/26/10 Page 4
Figure 5: Example of typical Relay-rack model
using 10” cavities.
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