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Copyright 2005 ISC Technologies 

 
Indoor Cabinets 
This upright style cabinet has provisions in the base for bolting it down to a concrete floor. 
All cabinets have an ac power outlet strip with six grounded outlets and a 4.5 meter (15 
foot) CSA (UL) approved, three-wire line cord installed in the cabinet’s base. Remove the 
knockouts that best fit your installation needs when routing the ac power cord, antenna 
cable, and other wiring. 
 
 

Caution 
DOC and FCC Rules and Regulations require that the transmitter be installed so that 
all controls are protected from adjustment by unauthorized personnel. Cabinet doors 
must be kept locked unless the transmitter area is secure. 
 

Transmitter Rack Mounting 
When the Power Amplifier is ordered without a cabinet, it is supplied with rack mounting 
hardware and can be installed in any standard EIA 19-inch rack. However, certain guide-
lines should be followed when installing the transmitter. The Power Amplifier location 
should provide enough unobstructed space (at least 30cm [12 inches]) immediately to the 
rear of the large finned heat sink and fan located on the rear of the PA chassis. This space 
is necessary for proper cooling of the amplifier power elements. 
When the Power Amplifier is installed in a cabinet, airflow through the cabinet should not be 
restricted, and the cabinet should have ample louver openings for airflow at both top and 
bottom. 
 

5.3 Operating and Servicing Hazards 

 

Voltages 

 

Operating voltages ranging from a few volts to 120 or 240 volts ac are present in this 
equipment. Care has been taken in the design of the equipment to insure personnel 
safety. Terminals where ac line voltages are present are enclosed by covers that 
require tools for removal. Do not remove these covers or service the equipment with 
ac power applied to the equipment. 
 

 

Human Exposure to Radio Frequency Energy 

 

In August 1996 the Federal Communications Commission (FCC) of the United States with its 
action in Report and Order FCC 96-326 adopted an updated safety standard for human exposure 
to radio frequency (RF) electromagnetic energy emitted by FCC regulated transmitters. Those 
guidelines are consistent with the safety standard previously set by both U.S. and international 
standards bodies. The design of this product complies with the FCC guidelines and these 
international standards. 
 
 This equipment is intended for use only in a permanent professionally installed licensed site. 
Licensing of that site may require that an Environmental Assessment be performed based upon 
human access, antenna type, antenna mounting height, ERP, operating frequency, duty factor, 
and any co-located transmitters that contribute to the overall Radio Frequency energy exposure 
level. 
 
 Compliance is ultimately the responsibility of the site licensee and a determination of compliance 
can only be made by evaluating the complex factors of the specific site. 
 

 

Summary of Contents for 9T97A250

Page 1: ...Copyright 2005 ISC Technologies 9T97A250 450 MHz Power Amplifier User Manual 9110 00118 REVB...

Page 2: ...cal Description 4 P A CIRCUIT AND LOGIC CIRCUIT DESCRIPTIONS 4 1 Power Amplifier Circuit Description 4 2 Logic Circuit Description 5 INSTALLATION 5 1 Overview 5 2 Cabinet Installation 5 3 Operating an...

Page 3: ...rough a two terminal barrier strip on the rear of the power amplifier A 15 pin D connector for monitoring the power amplifier s operating condition using its associated test set is mounted near the ba...

Page 4: ...er to each final Each final amplifies this input power and the output from the finals are combined and filtered The alarm logic samples both the output forward power and reflected power 4 1 2 Driver T...

Page 5: ...tors C2 C3 C17 C5 and C6 Power 28 Vdc is fed via a faston tab to the collector of transistor Q1 through a dc coupling network Matching of the transistor s Q1 output is provided by Z4 Z3 C8 C9 C10 and...

Page 6: ...r fan driver and optional fixed bias supply The logic board has three connectors a 1 x 2 pin connector for the dc fan power a 6 pin connector for the regulator and a 2 x 8 pin connector for the power...

Page 7: ...LED D10 are red When these LED s are illuminated this indicates a problem in the power amplifier LED D9 is latched by Q1 where the reflected level is detected above a certain level 30 of rated power...

Page 8: ...D10 and sets the alarm The temperature sensor has hysteresis determined by R29 and R32 5 INSTALLATION 5 1 Overview The transmitter location should be chosen to protect the equipment from dust and extr...

Page 9: ...louver openings for airflow at both top and bottom 5 3 Operating and Servicing Hazards Voltages Operating voltages ranging from a few volts to 120 or 240 volts ac are present in this equipment Care ha...

Page 10: ...lifier into the rack but do not interconnect 2 Connect the voltmeter to the power supply Check that polarity is correct Check that the leads are not shorted out 3 Switch ON the power supply and check...

Page 11: ...er Check that the power amplifier s output power is acceptable 18 Switch OFF the power supply and disconnect the 250 watt R F load Remove the front panel of the power amplifier and connect the power a...

Page 12: ...250 W Tuning tool slot insulated DC ammeter 25 A full scale 2 5 accuracy Cables with appropriate connectors Test set M 97 6 1 3 Exciter Check 1 Set up the exciter and test equipment as shown in Figur...

Page 13: ...ired to properly align the 9T97A250 RF power amplifier Directional wattmeter 50 ohms 250 watts full scale 5 accuracy Directional wattmeter 50 ohms 5 watts full scale 5 accuracy 50 ohm termination 250...

Page 14: ...26 or JR27 to enable the power auto shutdown to either NO POWER or LOW POWER respectively 14 Switch ON the power key the exciter and connect a 10 Vdc voltmeter to test point TP4 P 13 1 on the logic bo...

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