BIRD TERMALINE 8251 Series Operation Manual Download Page 22

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1 kW Termaline Coaxial Load Resistor Series 8251

Specifications

Frequency Range

8251
8251T
8251N
8251D, 8251D7-16

DC – 2400 MHz
DC – 2000 MHz
DC – 1000 MHz
470 – 860 MHz

Power Rating

1000 Watts continuous duty

Impedance, Nominal

50 ohms

Operating Position

Horizontal only – vent plug up

VSWR

8251N
8251D, 8251D7-16
8251

8251T

1 VSWR Measured using a female N connector.

1.10
1.065
1.10, DC – 1000 MHz
1.20, 1000 – 2000 MHz
1.30, 2000 – 2400 MHz
1.10, DC – 800 MHz
1.20, 800 – 1000 MHz
1.30, 1000 – 2000 MHz

Connectors

8251
8251D
8251D7-16
8251N
8251T

“QC” Type, Female LC
1–5/8” EIA Swivel Flanged
7/16 Jack, IEC
“QC” Type”, Female N
“QC” Type”, 1-5/8 EIA Fixed Flanged

Thermoswitch Temperature

8251T-230
8251T-300

110 °C (230 °F)
149 °C (300 °F)

Ambient Temperature

–40 to +45 °C (–40 to +133 °F)

Cooling Method

Oil dielectric and convection currents

Dimensions

18”L x 6”W x 8.5” H
(455 x 151 x 216 mm)

Weight, Nominal

25 lb. 8 oz. (11.6 kg)

Finish

Gray Powder Coat

Summary of Contents for TERMALINE 8251 Series

Page 1: ...ERMALINE LOAD RESISTOR SERIES 8251 Operation Manual Copyright 2016 by Bird Technologies Inc Instruction Book Part Number 920 8251S Rev G Termaline is a Registered Trademark of Bird Electronic Corporation ...

Page 2: ... to remove the RF transmission line while RF power is present WARNING Do Not Service Or Adjust Alone Under no circumstances should any person reach into an enclosure for the purpose of service or adjustment of equipment except in the presence of someone who is capable of rendering aid WARNING Safety Earth Ground An uninterruptible earth safety ground must be supplied from the main power source to ...

Page 3: ...ons in the instruction manual are not followed The caution symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area This symbol indicates that the unit radiates heat and should not be touched while hot This symbol indicates that the item must not be discarded but instead managed according to the collection and recycle of was...

Page 4: ... in an explosion or severe burns WARNING Disconnect the unit from all power sources before servicing The unit may be energized from multiple sources The potential for electric shock exists WARNING Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied Leaking RF energy is a potential health hazard CAUTION This load is designed for operation i...

Page 5: ...EGURIDAD DEL INSTRUMENTO BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI N EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L INSTRUMENT IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFIC...

Page 6: ...I DES INSTRUCTIONS D ENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D ENTRETIEN POUR PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX NE PAS EFFECTUER D ENTRETIEN SI L ON N A PAS ÉTÉ QUALIFIÉ POUR CE FAIRE ASSISTENZA TECNICA LE ISTRUZIONI RELATIVE ALL ASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO PER EVITARE PERICOLOSE SCOSSE ELETTRICHE NON EFFETTUARRE ALCU...

Page 7: ...apter Layout Introduction Describes the features of the 8251 series load and indicates the capabilities of each model in the series Theory of Operation Includes the details of the loads construction as well as a description of the coolant used and the interlock provided Installation This chapter details installation from unpacking the unit to proper mounting and RF connections Operating Instructio...

Page 8: ...Chapter 3 Installation 4 Unpacking and Inspection 4 Setup 4 Mounting 4 Installing Thermoswitch 5 Connecting RF Power 5 Using a QC Connector Coupling 6 Using a 13 30 Coupling 6 Using a Swivel Flanged Coupling 6 Using a Unflanged Coupling 6 Chapter 4 Operating Instructions 7 Normal Operation 7 Operating Under Abnormal Conditions 7 Shutting Down 7 Emergency Shutdown 7 Chapter 5 Maintenance 8 Troubles...

Page 9: ...f Contents viii Storage and Shipment 12 Storing the Load Resistor 12 Shipping the Load Resistor 12 Customer Service 12 Specifications 13 Replacement Parts 14 Available QC Type Connectors 14 Limited Warranty 15 ...

Page 10: ...used as supports for freestanding use or as brackets for fixed mounting A vent plug at the top of the unit relieves internal pressure from coolant expansion The load s simple and rugged design minimizes maintenance requirements Applications Use an 8251 load As a substitute antenna for tuning transmitters under nonradiation conditions or for making routine tests and adjustments As a substitute for ...

Page 11: ... 1 Optional thermoswitch kit P N 2450 129 available 8251N Female N DC 1000 MHz N A1 8251D2 2 Requires bullet P N 4712 020 not included 1 5 8 EIA Swivel 470 860 MHz N A1 8251D7 16 7 16 IEC 470 860 MHz N A1 8251T 2303 3 Bullet included 1 5 8 EIA Fixed Flanged DC 2000 MHz 230 F 110 C 8251T 3003 1 5 8 EIA Fixed Flanged DC 2000 MHz 300 F 149 C ...

Page 12: ... of the cooling tank where radiator fins surrounding the tank transfer the heat to the air When the coolant is heated thermal expansion causes an increase in the internal pressure An expansion tank on the upper rear of the load allows for coolant expansion due to the rise in temperature and is equipped with a vent plug see Figure 1 on page 2 to relieve this pressure while protecting the opening fr...

Page 13: ...tance on page 9 for details 1 Remove the shipping plug from the load Refer to Figure 1 on page 2 for location of the plugs 2 Verify the o ring seal is in place on the vent plug then install in the load Mounting Place the load in a dry dust and vibration free environment Do not use outdoors or in areas of condensing humidity For operation above 300 W allow at least 6 15 cm of clearance on all sides...

Page 14: ...o not apply more than 10 in lb 1 1 N m of torque to the terminal nuts 4 Replace the cover 5 Check the requirements of the transmitter interlock and make connections as required Figure 2 Thermoswitch Connecting RF Power Note After installing the load the RF transmission line can be attached using standard coaxial line coupling kits WARNING Disconnect the unit from all power sources before servicing...

Page 15: ... flange on the coaxial input outer conductor 5 Insert the bolt sets and tighten evenly all around to transmission line manufacturer s recommended torque Note Use all of the bolts Figure 3 Swivel Flanged Coupling Using a Unflanged Coupling 1 Insert the center bullet 2 Push until it sets the midpoint nibs 3 Position the outer sleeve with clamping bands over the input connector 4 Set the transmission...

Page 16: ...rned off Turn off RF power at the source Emergency Shutdown Turn off RF power at the source Note If the interlock thermoswitch is properly connected RF power will be automatically turned off when the coolant temperature reaches an unsafe level WARNING The vent plug must be used at all times when the unit is operating or cooling Failure to do so could result in an explosion or severe burns CAUTION ...

Page 17: ... Replace the O ring See Load Resistor on page 11 Defective or improperly installed rear O ring Replace the O ring See Rear Seal on page 10 High or low DC resistance Loose RF input connector Tighten connector Faulty RF input connector Models with QC type connectors Replace connector See RF Connector on page 10 All other models Return the unit for service Faulty resistor Replace the resistor See Loa...

Page 18: ...enter and outer conductor of the load resistor 4 Compare the measured value with the previous measurement and with the baseline resistance measured when the load was put into service Note If the new value differs from either of these by more than 1 ohm this could indicate a failing resistor Figure 5 Measuring Resistance Coolant Coolant lifetime will vary greatly depending on operating conditions F...

Page 19: ...ctor normally supplied frequency and power must be limited to the capa bilities of the connector Rear Seal If the coolant has not been drained from the load stand the unit on end with the RF connector down before disassembly 1 Unscrew the four screws at the corners of the guard cover 2 Unscrew the tube nut from the tank nozzle using a small wrench if necessary and pull the nozzle free 3 Unscrew an...

Page 20: ...w any coolant to drip back into the tank Note The O Ring should be free of twists and positioned evenly around the flange of the resistor housing If the O ring shows signs of deterioration e g is no longer pliable or has surface cracks replace it 7 Replace the entire load resistor assembly Note It cannot be further disassembled 8 Put the clamping band in place and tighten it 9 Remove the shipping ...

Page 21: ...cessary to empty out the coolant 4 Wrap the connector in padding 5 Pack and brace the load in a sturdy wooden crate for shipment Customer Service Any maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified service center If the unit needs to be returned for any reason request an Return Material Authorization RMA through the Bird Technologies web...

Page 22: ...connector 1 10 1 065 1 10 DC 1000 MHz 1 20 1000 2000 MHz 1 30 2000 2400 MHz 1 10 DC 800 MHz 1 20 800 1000 MHz 1 30 1000 2000 MHz Connectors 8251 8251D 8251D7 16 8251N 8251T QC Type Female LC 1 5 8 EIA Swivel Flanged 7 16 Jack IEC QC Type Female N QC Type 1 5 8 EIA Fixed Flanged Thermoswitch Temperature 8251T 230 8251T 300 110 C 230 F 149 C 300 F Ambient Temperature 40 to 45 C 40 to 133 F Cooling M...

Page 23: ...Part Number BNC Female 4240 125 BNC Male 4240 132 C Female 4240 100 C Male 4240 110 HN Female 4240 268 HN Male 4240 278 LC Female1 1 Normally supplied on the 8251 4240 031 LC Male 4240 025 Open Term 10 32 Nut 4240 080 LT Female 4240 018 LT Male 4240 012 N Female2 2 Normally supplied on the 8251N 4240 062 N Male 4240 063 SC Female 4240 090 SMA Female 4240 336 SMA Male 4240 334 7 16 Jack IEC Type 16...

Page 24: ...ery such claim for breach of these warranties shall be deemed to be waived by Buyer unless made in writ ing within ten days from the date of discovery of the defect The above warranties shall not extend to any products or parts thereof which have been subjected to any misuse or neglect damaged by accident rendered defective by reason of improper installation or by the performance of repairs or alt...

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