Rolls HR78 User manual
HR78 AM/FM Digital Tuner
Rolls Corporation
Salt Lake City, UT
2/13
SCHEMATIC
To view the HR78 schematic, visit our web site at www.rolls.com. Find the HR78
page, and download the online Owners Manual.
PROGRAMMING PRESETS
Select the AM or FM band you wish to program (AM, or FM). Using the TUNING +, or
TUNING - buttons to select the station you wish to program. To store that station in a
preset (1 - 10), press the MEMORY button followed by the Preset Number button you
want that station stored to. Then press the memory button once again to store the pre-
set. (+5 must be used for accessing presets 6-10)
You may repeat this process for all 10 FM presets, and 10 AM presets.
SPECIFICATIONS
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 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: VDC
Dimensions: (190w x 185d x 42.5h) mm
Weight: 3 lbs
www.rolls.com
AM LOOP ANTENNA
- Connect the cord of the accessory AM loop antenna to the AM LOOP 300 Ohm termi-
nals. When tuning in AM stations, move the antenna to the left or right and set in the direc-
tion 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 reections
FM waves, like light waves, travel in a straight direction unless reected o 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 reected o build-
ings 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 reection". To reduce this problem, select an antenna with good directivity and
place it in the best location with strong reception.
QUICK START OPERATION GUIDE
INTRODUCTION
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. Please
read this manual carefully as it contains important information regarding the proper setup
and operation of the HR78.
FEATURES:
• 10 FM and 10 AM presets • Retains presets when power is o
• Large LCD digital display • 1 space EIA 1/2 rack chassis
• Output Level control • RCA and 1/8" (3.5mm) Outputs
INSPECTION
Unpack and Inspect the HR78 package Your HR78 was carefully packed at the factory in
a protective carton. Nonetheless, 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.
WARRANTY
For complete Warranty information and registration, please visit our web site; www.rolls.
com. Click on the REGISTER YOUR WARRANTY HERE line. Or, complete the Warranty
Registration Card and return it to the factory.
DESCRIPTION
FRONT PANEL
• POWER: When pressed in, applies power to the HR78.
• FREQUENCY DISPLAY: LCD display showing the active information relevant to the cur-
rent operation of the HR78.
• 1 - 10 PRESET STATIONS: Selects and Stores the Preset stations. (+5 must be used for accessing
presets 6-10)
• FM ST: Selects between Stereo and Mono FM operation.
• BAND: Selects between the FM preset, and the AM preset band.
• MEMORY: When the desired station is selected, this button is pressed, followed by the
desired Preset Station number to Store the preset.
• LEVEL: Adjusts the output level of both the RCA and 1/8" (3.5mm) outputs. PLEASE
NOTE: FOR A LINE LEVEL OUTPUT, SET THE LEVEL CONTROL AT APPROXIMATE-
LY 3 O'CLOCK.
• TUNING (- and +): Selects the stations that the HR78 is receiving. Pressing and holding
the + or - buttons will auto search for the next station.
DESCRIPTION CONTINUED
HR78 DISPLAY
-Band indicator and number.
-Stereo / Mono indicators. Indicates whether the HR78 FM Mode is operating in Stereo or Mono.
-Mhz/Khz - indicates Megahertz (FM), or Kilohertz (AM) reception.
-Preset number - indicates which preset has been selected within the selected band.
-Station frequency indicator
REAR PANEL
• VDC USE ROLLS SUPPLIED ADAPTER ONLY!!!
• Stereo Outputs RCA: Unbalanced RCA outputs.
1/8" (3.5mm): Stereo Line/Headphone Output
• FM ANT. 75 Ohm: Connects to the included 75 ohm FM antenna.
• AM LOOP ANT. 300 Ohm Connects to the included 300 ohm AM Loop antenna.
CONNECTION
- Connect the Rolls supplied adapter to the VDC power jack of the HR78, and to an AC outlet
with the proper voltage.
- Connect the HR78 Left and Right outputs to a mixer, amplier, or other audio device.
FM Antenna
INDOOR T SHAPED ANTENNA
- Connect the antenna to its corresponding input on the rear panel of the HR78. While
listening to a broadcast, hold the stretched ends and move around until the antenna is
facing a direction where the signal comes in the strongest. Secure the antenna in this
position.
OUTDOOR FM ANTENNA
- Installation of an outdoor FM antenna is recommended for a very high quality FM recep-
tion.
• The lead-in antenna cable should be of the 75-ohm coaxial type as it suppresses intru-
sion of noise more eectively than the 300 ohm twin lead type.
• The cable should be straight and as far away from power lines as possible. Cut o any extra
length.
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