Bird Technologies 81-37-25 User Manual

YOU'RE HEARD, LOUD AND CLEAR.

Instruction Manual for

VHF & UHF Dual-Section

Isolators

Manual Part Number

7-9095

8625 Industrial Parkway, Angola, NY 14006 Tel: [phone] Fax: [phone] [e-mail] 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 7-9095

Copyright © 2006 TX RX Systems, Inc.

First Printing: May 1994

Version Number Version Date

1 05/24/94

2 07/29/99

3 01/17/06

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.

Input Connector

Output Connector

Remove screws to

access tuning

capacitors

Remove stickers
to access tuning

capacitors

Remove stickers

to access tuning

capacitors

Input Section

Load

Output Section

Load

Figure 1: VHF or UHF Dual-Section Isolator.

GENERAL DESCRIPTION

Isolators perform two important functions. Their pri­mary function is to keep other RF frequencies out
of the transmitter so that intermodulation products
cannot be generated. isolators have a substantial
amount of reverse isolation. They also insure that
the transmitter never sees any significant reflected

struction and theories of operation of ferrite isola­tors refer to the TX RX Systems Inc. publication
“SEMINAR SUBJECTS” titled “An Elementary
Introduction to Ferrite Isolators, Circulators and RF
Loads” (literature number C2003H92). Contact
your TX RX Systems sales representative if you

wish to order a copy.
power so it will always operate with maximum sta­bility at full-power output. Isolators prevent energy
from getting to the transmitters output by dumping
RF energy entering the output of the isolator into a
dummy load.

Dual-Section Isolators

Dual section units have two load ports, one for

each section of the isolator, refer to Figure 1.

Although loads of equal power rating may be used

for both ports, it is customary to use an output load
This manual deals primarily with the procedures
necessary for field tuning ferrite isolators to new
frequencies. It is assumed that procedures in this
manual will be carried out by a skilled electronics
technician who is familiar with the communications

capable of dissipating the maximum expected

reflected power that might be encountered. A small

load (5 watts) is usually installed on the first section

where the high reflected power is not a factor. The

model number on the isolator label indicates the
system. For a more detailed discussion of the con-

TX RX Systems Inc. Manual 7-9095-3 01/17/06 Page 1