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VEC-862 Instruction Manual Step Attenuator

VEC-862 STEP ATTENUATOR

Introduction

The VEC-862 Step Attenuator is ideal for any application requiring a low power

50 ohm attenuator that operates from dc to lower UHF.

The VEC-862 Step Attenuator can be used to prevent front end overload or as an

"isolation pad" to properly terminate filters and/or preselectors. Common uses

include receive signal reduction for transmitter hunting, a standard dB reference

for S meter scale calibration, a dB change reference for antenna comparisons,

and many other low-power signal level attenuation applications.

The VEC-862 Step Attenuator provides attenuation values to 81dB in one dB

steps. The maximum power rating is 125 milliwatts (1/8 watt) and the usable

frequency range extends into the UHF range. The input and output connectors

are standard 50 ohm BNC females.

Specifications

Connectors........................................ BNC female

VSWR .............................................. <1.25:1 from dc to 170 MHz

(typically <1.1:1)

(worse case for all values of attenuation)

<1.6:1 from 170 to 500 MHz

(typically <1.1:1)

Bypass Loss...................................... <0.65 dB at 170 MHz

<2 at 500 MHz

Power Rating.................................... 125 milliwatts continuous

Attenuation Steps ............................. 1dB, 2dB, 3dB, 5dB, 10dB,

and (3) 20dB steps.

Attenuation Accuracy....................... 0.2 dB or 5% of total attenuation,

whichever is greater

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VEC-862 Instruction Manual Step Attenuator 1 VEC-862 STEP ATTENUATOR Introduction The VEC-862 Step Attenuator is ideal for any application requirin

VEC-862 Instruction Manual Step Attenuator 2 Operation The VEC-862, like all constant impedance "pi" or "T" attenuators, is a bi

Page 3

VEC-862 Instruction Manual Step Attenuator 3 Transmission/Return Loss Graphs A: Transmission Loss Lines B: Return Loss Lines

VEC-862 Instruction Manual Step Attenuator 4 Schematic

VEC-862 Instruction Manual Step Attenuator 5 Parts List Designator Description P/N R1 5.62 Ohm Resistor 100S-0562 R17, R20, R23 10 Ohm Resistor

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Vectronics VEC-862 Manuel d'utilisateur