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XR3/XR6 Frequency Change Procedure Page 1 of 7

IS07012 Issue 1.0

IS07012 – XR3/XR6 Frequency Change Procedure

INFORMATION SHEET

1 INTRODUCTION

The XR3/XR6 is basically a broadband

amplifier with fixed tuned elements in the

RF drive stage and the RF output filter.

The selection of frequency sensitive

components and adjustment of variable

inductors used in these circuits is normally

performed at the factory at the transmitter’s

assigned carrier frequency. When a

frequency change is required, use the

following procedures to realign the

frequency sensitive components.

1.1 Equipment Affected

This procedure applies to first release

XR3/XR6 transmitters (Nautel Part #

NARA48 and NARA49).

1.2 Responsibility for

Implementation of Procedure

This procedure should be carried out by

qualified station maintenance personnel

who are familiar with the XR3/XR6

transmitter.

1.3 Scheduling

This procedure may be implemented at

the convenience of station maintenance

personnel.

1.4 Manpower Requirements

It is estimated that implementing this

modification will require eight (8) hours to

complete. Note that it is necessary for the

transmitter to be placed in an off-air status

for the duration of this procedure.

1.5 Special Tools/Test Equipment

The following test equipment is required.

Where applicable, items are referenced in

text.

• Spectrum analyzer

• Oscilloscope

• Digital multimeter

• Vector impedance meter (e.g., Tomco

TE1000)

• Function generator (audio to RF)

• Frequency counter

• Modulation monitor

• Audio test set (response and

distortion)

• RF Current Probe(or Delta probe with

meter)

• RMS voltage meter

• Delta RF current probe

• 200 Ω potentiometer

• Notch filter

• Attenuator pad

• Test cable (202-5010)

•

Test load (176-5720-01)

•

Computer with Microsoft

®

Excel

®

1.6 Parts Required

The frequency dependent parts required

to change to the new frequency were

shipped in the same package as this

document. Part contents will vary

depending on the new carrier frequency.

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