Rolls HR78 业主指南

Thank you for your purchase of the Rolls HR78 AM/FM Digital Tuner. This unit 

has been carefully designed and assembled to provide years of reliable AM/FM 

reception and audio quality. Please read this manual carefully as it contains im-

portant information regarding the proper setup and operaton of the HR78.

 

• 12 FM and 6 AM presets

• Retains presets when power is off

• Large digital LCD display

• Level control

• 9 - 10 kHz bandwidth select switch

• RCA and 1/8" (3.5 mm) Stereo Outputs

1. Unpack and Inspect the HR78 package

Your HR78 was carefully packed at the factory in a protective carton. Nonethe-

less, be sure to examine the unit and the carton for any signs of damage that 

may have occurred during shipping. If obvious physical damage is noticed, 

contact the carrier immediately to make a damage claim. We suggest saving 

the shipping carton and packing materials for safely transporting the unit in the 

future.

2. 

For complete Warranty information and registration, please visit our website; www.

rolls.com. Click on the REGISTER YOUR WARRANTY HERE line. Or, complete the War-
ranty Registration Card and return it to the factory.

INTRODUCTION 

 

 

 

1

FEATURES

INSPECTION

TABLE OF CONTENTS

DESCRIPTION

 

Front Panel 

 

 

 

2

 

Rear Panel 

 

 

 

3

CONNECTION   

 

 

 

4

OPERATION   

 

 

 

5

SPECIFICATIONS 

 

 

 

6

WARRANTY   

 

 

 

Back Cover

FM
Intermediate Frequency: 

 

 

10.7 MHz +/- 0.3

Tuning Range:  

 

 

 

87.5 - 108 MHz

30 dB quieting sensitivity: 

 

 

28 dB

IF Rejection 87.9 MHz: 

 

 

50 - 56 dB

Image Rejection 105.9 MHz:   

 

20 - 26 dB

3dB Limiting Sensitivity: 

 

 

28 - 35 dB

THD 1 mV Input: 

 

 

 

0.5 - 2 %

Auto Tuning Sensitivity 97.9 MHz: 

 

25 - 30 dB

AM Suppression: 

 

 

 

26 - 32 dB

AM
Intermediate Frequency: 

 

 

450 kHz +/- 5

Tuning Range:  

US:    

 

520 - 1710

 

 

 

International:    

531 - 1602 kHz

20 dB quieting sensitivity: 

 

 

58 dB

IF Rejection 603 kHz:  

 

 

25 - 32 dB

Image Rejection 1404 kHz:   

 

32 - 38 dB

Auto Tuning Sensitivity 999 kHz: 

 

28 - 35 dB

Max Output @ 1 kHz:  

 

 

0.5V +/- 0.05V

Supply Voltage: 

 

 

 

12 VDC, 200mA  

 

 

 

 

 

 

(Rolls Model PS27)

Dimensions:   

 

 

 

(190w x 185d x 42.5h) mm

Weight: 

 

 

 

 

3 lbs