Rolls HR78 业主指南
DESCRIPTION CONT.
REAR PANEL
• +12 VDC
• Stereo Outputs RCA: Unbalanced RCA outputs.
1/8" (3.5mm): Stereo Line/Headphone Output
• FREQ SELECT: This switch selects between 9 and 10Khz frequency centers
for the AM section. Note: The Power must be off when changing the Frequency
Select.
• 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.
• Stereo Outputs RCA: Unbalanced RCA outputs.
1/8" (3.5mm): Stereo Line/Headphone Output
• FREQ SELECT: This switch selects between 9 and 10Khz frequency centers
for the AM section. Note: The Power must be off when changing the Frequency
Select.
• 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 PS27 to the 12VDC power jack of the HR78, and to an AC
outlet with the proper volage.
outlet with the proper volage.
Connect the HR78 Left and Right outputs to a mixer, amplifier, or other audio
device.
device.
FM Antenna
Indoor T-shaped FM antenna
Connect the T-shaped FM 300 ohm antenna to its corresponding input on the
rear panel of the HR78. Open the ends of the antenna to form a "T" shape. 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.
Indoor T-shaped FM antenna
Connect the T-shaped FM 300 ohm antenna to its corresponding input on the
rear panel of the HR78. Open the ends of the antenna to form a "T" shape. 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
reception.
• The lead-in antenna cable should be of the 75-ohm coaxial type as it suppress-
es intrusion of noise more effectively than the 300 ohm twin lead type.
• The cable should be straight and as far away from power lines as possible. Cut
off any extra length.
Installation of an outdoor FM antenna is recommended for a very high quality FM
reception.
• The lead-in antenna cable should be of the 75-ohm coaxial type as it suppress-
es intrusion of noise more effectively than the 300 ohm twin lead type.
• The cable should be straight and as far away from power lines as possible. Cut
off any extra length.
OPERATION
SET THE FREQUENCY SELECT
The Power must be switched OFF when selecting this option.
AM radio stations in the United States operate on 10kHz channel centers. In
other parts of the world, stations are on 9kHz centers. The HR78 provides a rear
panel switch to select the frequency centers for proper reception.
If you are not sure where this switch should be set, contact your local station for
their operating information.
The Power must be switched OFF when selecting this option.
AM radio stations in the United States operate on 10kHz channel centers. In
other parts of the world, stations are on 9kHz centers. The HR78 provides a rear
panel switch to select the frequency centers for proper reception.
If you are not sure where this switch should be set, contact your local station for
their operating information.
PROGRAMMING PRESETS
Select the AM or FM band you wish to program (AM, or FM 1 or 2). Using the
TUNING +, or TUNING - buttons - select the station you wish to program. To
store that station in a preset (1 - 6), press the MEMORY button followed by the
Preset Number button you want that station stored to.
You may repeat this process for all 12 FM presets, and 6 AM presets.
Select the AM or FM band you wish to program (AM, or FM 1 or 2). Using the
TUNING +, or TUNING - buttons - select the station you wish to program. To
store that station in a preset (1 - 6), press the MEMORY button followed by the
Preset Number button you want that station stored to.
You may repeat this process for all 12 FM presets, and 6 AM presets.
AM Loop antenna connection
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. Interfer-
ence or noise may be generated.
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. Interfer-
ence or noise may be generated.
Multipath 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 "multipath reflection". To reduce
this problem, select an antenna with good directivity and place it in the best loca-
tion with strong reception.
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 "multipath reflection". To reduce
this problem, select an antenna with good directivity and place it in the best loca-
tion with strong reception.
CONNECTION CONT.