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HR78X 

AM/FM Digital Tuner   

With XLR Outputs 

 

Rolls Corporation

Salt Lake City, UT

9/19

SPECIFICATIONS
FM
Intermediate Frequency: 

 

 

10.7 MHz +/- 0.05

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: 

 

 

530 - 1710 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: 

 

 

 

15 VDC Rolls PS27s 

 

 

 

 

 

Dimensions: 

 

 

 

6.75"w x 4.5"d x 1.75"h

Weight:   

 

 

 

3.5 lbs

www.rolls.com

AM LOOP ANTENNA
- Connect the cord of the accessory AM loop antenna to the AM LOOP 300 Ohm terminals. When 
tuning in AM stations, move the antenna to the left or right and set in the direction which yields 
the optimum reception.

• Do not place the power cord or speaker cords near the loop antenna. Interference or noise may 

be generated.

Multi path reflections
FM waves, like light waves, travel in a straight direction unless reflected off objects in their path. 
Because of this, two sets of waves reach your antenna from the FM station; those that have 
traveled directly to the antenna, and those that have been reflected off buildings or mountains. 
When the antenna receives both kinds of signals, the two interfere with each other and result 
in distorted sound and poor separation. This phenomenon is called "multi path reflection". To 
reduce this problem, select an antenna with good directivity and place it in the best location 
with strong reception.

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