Bird Technologies 28-88-04B User Manual

Instruction Manual
Vari-Notch
Manual Part Number
YOU'RE HEARD, LOUD AND CLEAR.
® Duplexers (4” Cavities)
7-9176
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 one year 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 7-9176
Copyright © 2004 TX RX Systems, Inc.
First Printing: September 1997
Version Number Version Date
1 09/19/97
2 04/09/98
3 04/26/99
4 06/23/04
Symbols Commonly Used
WARNING
CAUTION or ATTENTION
High Voltage
Use Safety Glasses
ESD Elecrostatic Discharge
Hot Surface
Electrical Shock Hazard
NOTE
Important Information
Bird Technologies Group TX RX Systems Inc.
GENERAL DESCRIPTION
Vari-Notch® duplexers are used to provide simulta­neous operation of a transmitter and receiver (or two transmitters) which are at different frequencies while connected to a common antenna. These duplexers are frequently used in radio repeater systems. This instruction manual (part# 7-9176-1) covers the installation, tuning, and maintenance of Vari-Notch duplexers constructed from 4” diameter cavities.
Tabl e 1
shows the model numbers and electrical specifications of the duplexers covered by this manual. Vari-Notch duplexers are composed of two groups (or sets) of daisy-chained resonant cav­ity filters, which couple signals to and from the shared antenna. This creates two signal paths, a
high frequency channel and a low frequency chan­nel. The minimum frequency separation between the channels, as well as the isolation in dB’s (per channel and between channels) is listed for each model in table 1.
The cavity filters used in a transmit channel will reduce transmitter noise components at the receive frequency, thus preventing noise desensiti­zation of the receiver. Conversely, the cavity filters used in a receive channel will isolate the receiver from the transmitter carrier preventing carrier desensitization of the receiver.
Model
Number
28-38-03A/D 132 - 174 150 0.5 1.9 80 45
28-37-07A/C 144 - 174 400 3 0.7 85 30
28-37-06A/C 144 - 174 125 1 1.2 75 35
28-37-04A/C 144 - 174 125 0.5 1.8 65 30
28-37-81227-A-R2 144 - 174 125 0.5 2 65 30
28-52-02A 215 - 250 250 1.6 1.2 90 55
28-56C-02A 380 - 420 250 5 0.7 100 50
28-65-07A/B 406 - 430 250 3 1.25 85 60
28-65-02A/B 406 - 430 350 3 0.8 80 30
28-66-02A/B 442 - 450 350 5 0.6 100 46
28-70-09A/B 450 - 470 250 5 1.25 100 70
28-70-02A/B 450 - 470 350 5 0.6 100 46
28-69-06A/B 470 - 512 250 3 1.25 86 60
28-69-02A/B 470 - 512 350 3 0.8 80 30
Frequency
Range
(MHz)
Power
Rating
(Watts)
Min. Freq.
Separation
(MHz)
Insertion
Loss
(dB)
Isolation
(dB)
Per Chan. Bet Chan
28-89-01A/B 806 - 866 125 45 0.8 90 60
28-88-04A/B 890 - 960 125 39 0.8 90 50
28-88-01A/B 890 - 960 125 3.6 1.25 90 40
28-97-01A/B 1215 - 1300 125 12 1 100 50
Tabl e 1 :
TXRX Systems Inc. Manual 7-9176-4 06/23/04 Page 1
Vari-Notch Duplexer electrical specifications.
Resonant cavity filters are the basic building blocks
a
of the system. Also important, are the interconnect cables between each filter which have cut length's equivalent to either 1/4 λ or 3/4 λ of that channels pass frequency. The exception is the antenna cable that couples each channels final filter to the antenna port, which is cut to 1/2 λ of the other
(or
remaining) channels pass frequency. This effec­tively places a relatively large impedance in parallel with the antenna, insuring a good impedance match between the other
(or remaining) channel and the antenna. This technique of impedance matching allows both channels to be connected to the same antenna with very little loss due to mis­matching. The antenna cables are permanently soldered and crimped to the antenna junction. The combination of the antenna junction and the attached antenna cables is referred to as an "Antenna Junction Assembly".
Figure 1
shows the functional block diagram of a typical four-cavity Vari-Notch duplexer system. Six and eight cavity systems are similar except for the
extra filters in each channel. The photograph shown in
Figure 2
is the front view of a typical four­cavity Vari-Notch duplexer. Each of the physical components in the system is labeled with the field adjustable parts shown in emboldened italics.
UNPACKING
Care should be used when removing the duplexer from it's shipping container to avoid unnecessary damage. It is important to visually inspect the duplexer for any shipping damage as soon as pos­sible after taking delivery. It is the customers
responsibility to file any necessary damage claims with the carrier.
Vari-Notch duplexers are rugged devices but may become detuned if jostled or dented during ship­ping. The most easily damaged parts of the duplexer are the tuning rods. These rods are marked where they exit from the locking nut with a dab of red varnish or other color/type of paint. If this seal appears to be broken it may indicate that the system has been detuned in transit.
High Frequency Equipment
Low Frequency Equipment
RG214 or RG142 Double-Shielded Cable (Supplied by customer)
Rejection notch tuned to low frequency
Rejection notch tuned to high frequency
Interconnect Cable
λ
or 3/4 λ of this)
(1/4 (channels pass freq.)
Vari-
Notch
Filter
Passband tuned to high frequency
Vari-
Notch
Filter
Passband tuned to low frequency
Vari-
Notch
Filter
Vari-
Notch
Filter
Antenna Cable
(1/2 λ of the other)
(channels pass freq.)
Antenna Junction
To Antenn
TYPICAL FOUR CAVITY VARI-NOTCH FILTER
Figure 1:
TXRX Systems Inc. Manual 7-9176-4 06/23/04 Page 2
Block diagram of typical four-cavity Vari-Notch Duplexers.
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