1-GT-30TT datasheet, PDF - EEWORLD Datasheet

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1-GT-30TT: DescriptionRF/Microwave Attenuator, 4000 MHz - 8000 MHz RF/MICROWAVE VARIABLE ATTENUATOR, 2.9 dB INSERTION LOSS-MAX; CategoryWireless rf/communication Radio frequency and microwave; File Size172KB，4 Pages; ManufacturerCobham PLC

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1-GT-30TT Overview

RF/Microwave Attenuator, 4000 MHz - 8000 MHz RF/MICROWAVE VARIABLE ATTENUATOR, 2.9 dB INSERTION LOSS-MAX

1-GT-30TT Parametric

Parameter Name	Attribute value
Reach Compliance Code	unknown
Is Samacsys	N
Other features	SMA-F, TTL COMPATIBLE
Nominal attenuation	32 dB
Characteristic impedance	50 Ω
structure	COAXIAL
Maximum input power (CW)	30 dBm
Maximum insertion loss	2.9 dB
Maximum operating frequency	8000 MHz
Minimum operating frequency	4000 MHz
Maximum operating temperature	85 °C
Minimum operating temperature	-55 °C
RF/Microwave Device Types	VARIABLE ATTENUATOR
Maximum voltage standing wave ratio	1.75
Base Number Matches	1

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ATTENUATORS, PIN DIODE

0.25–18 G H

GENERAL INFORM TION

KDI/Triangle Pin Diode attenuators continuously change the amplitude of

a microwave signal by applying a varying DC current, voltage, or digital

signal, depending upon the Model type selected. The basic current con-

trolled models do not have thermal compensation included, the voltage

controlled & digital models have linearization and/or temperature com-

pensation options.

A matched configuration of diodes keeps the VSWR low through all

values of attenuation and frequency.

Linearization is provided in some models, which produces an output

signal that is linearly proportional to the control voltage.

Temperature compensation is also provided in some models, over either

the –55 to +85 degree C range, 10–40 degree C range, or 0-70 degree C

range depending upon the Model type selected. Digitally controlled ana-

log attenuators, Model series “GA”, require an TTL binary logic input.

Standard units in the GA series have an 8 bit input producing 256 dis-

crete values of attenuation. Optional 10–12 bit logic is readily available

simply by specifying in the model number with a dash number.

SERIES GT, 1GT,

2GT, GA

Control Input Impedance:

Switching Period:

10 K ohms, 20 pf.

Standard models can be changed from any

value of attenuation to any other value in 10

microsec. Units can be provided with switch-

ing speed to 300 nanosec. on request. Speed

is related to maximum attenuation required.

That is, 32 dB models are faster than 64 dB

models. Insertion Loss will increase by a fac-

tor of 1.6 on higher speed models.

SMA standard, others on request.

GENERAL SPECIFICATIONS

R.F. Power:

To prevent self-biasing, the attenuators

should be operated at less than 100

mW CW, and 60 watts peak. Units will

not be damaged by application of 1 watt

CW or 100 watts peak.

50 OHMS.

+10 mA, maximum attenuation. 0 mA,

zero attenuation for all current controlled

models.

±15 volts at ±50 mA maximum. For all

models. 1GT, 2GT, GA (except GT)

0–10 volts produces 0–32 dB for 32 dB

models and 0–64 dB for 64 dB models.

Other values of control voltage can be

provided on request.

10 VDC

(dB)

Connectors:

RF Impedance:

Current (GT Models):

Power Requirements:

Control Voltage (1 GT and

2 GT Models):

Maximum Control Voltage:

BIAS CURRENT (mA)

Typical curve of attenuation vs. bias current for GT Models.

BASIC MODEL TYPES

Model

No.*

GT-( )

1-GT-(

2-GT-(

GA-( )

GA-( )TT

GA-( ) TR

)

)TT

)TR

)

)TT

)TR

Input

Control

Current

VOLTAGE 10 TO 40 C

VOLTAGE-TEMP COMP –55 TO +85 C

VOLTAGE-TEMP COMP 0 TO 70 C

VOLTAGE- LINEARIZED 10 TO 40 C

VOLTAGE-LINEARIZED TEMP COMP –55 TO +85 C

VOLTAGE-LINEARIZED TEMP COMP 0 TO 70 C

DIGITAL-TTL 10 TO 40 C

DIGITAL-TTL- TEMP COMP –55 TO +85 C

DIGITAL-TTL-TEMP COMP 0 TO 70 C

Accuracy

Chart

No.

A, B

Input

Control

0–10MA

0–10VDC

TTL

Input Fixed

None

+ & – 15VDC @50 MA MAX

KEY:

Inches[Millimeters] .XX ±.03 .XXX ±.010 [.X ±0.8 .XX ±0.25]

60 South Jefferson Road, Whippany, NJ 07981

Tel: 973-887-8100 • Fax: 973-884-0445

email: sales@mcekdi-integrated.com

See us on the web @ www.mcekdi-integrated.com

11-5-02

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