Product Description
Rolls HR70 Digital FM Transmitter (Maximum Distance 200 Feet)
The HR70 is a digital display analog FM transmitter. Apply a signal to the XLR or RCA inputs of the HR70. Select what frequency you would like to broadcast those signals on (88 to 108 MHz) and you are now sending signals via FM radio, assuming the antenna is connected properly. The HR70 also has a talk over circuit built in. Even though the HR70 is a micropower RF transmitter and requires no FCC license, for it to function properly, good RF practices still apply. The wire antenna provided is set up for the middle of the band or about 92MHz. For any transmitter to operate at its best, it must be earth grounded. You can think if it as "pushing" the signal against the earth. Range can vary widely, depending on grounding, antenna placement, obstructing building/walls, etc.. We have had people report ranges up to 150′. Some experimenting may be required at your venue to find the optimum installation for your situation.
FAQ:
What is the maximum distance an FM transmitter can broadcast without a license? The quick answer is approximately 200 feet for an FM Transmitter covered under Part 15 (Read FCC Public Notice dated July 24, 1991). The full answer is much more complicated than that: 250 µV/meter @ 3 meters (also measured as 48 dBuV/m).
- Frequency Response: 20 Hz - 12.5 kHz
- Antenna Impedance: 50 ohm
- Power: 12 - 15 VDC 500mA 5 x 1.2 mm DC Jack
- Input Impedance: 100KΩ Unbalanced, 600Ω Balanced
- Indicators: Power LED and Clip LED
- Input/Output jacks: XLR balanced INPUT RCA unbalanced input and output
- Dimensions: 6.75"w x 4.25"d x 1.6"h
- Simple way to broadcast signals over FM
- Antenna Jack: BNC
- Antenna included
- Clean simple design
- All metal chassis
- Included DC power supply
INTRODUCTION Thank you for your purchase of the Rolls HR70 FM Digital Transmitter. This unit has been carefully designed and assembled to provide years of reliable FM transmission. Please read this manual carefully as it contains important information regarding the proper setup and operation of the HR70. This unit complies with FCC part 15 rules. INSPECTION Unpack and Inspect the package. Your HR70 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.
• DISPLAY: LCD display showing the active information relevant to the current operation of the HR70. • MIC/LINE: When pressed in, the gain of the XLR Mic In is reduced by 30 dB. • CLIP: LED for indication of when the circuit is over driven/clipping. • MUTE: When pressed unit will MUTE. • LEVEL: Adjusts the level of output. • FREQUENCY UP / DN: Selects the frequency that the HR70 is transmitting. • RELEASE TIME: Adjusts the amount of time for the “ducked” signal to return to its normal level. Counterclockwise; slow - Clockwise; fast. • MIC LEVEL: Adjusts the amount of gain for the Mic In circuit. • DUCK SENSITIVITY: The Threshold at which “ducking” begins. When the microphone level reaches the threshold, the signal present at the Line In jacks is reduced until the announcement is over, then the Line In signal returns to its previous level. A NOTE ON THE HR70 THRESHOLD SETTING, WITH THE SENSITIVITY CONTROL FULLY CLOCKWISE: If a signal is on the XLR input, the ducking will begin (the threshold is) at -30 dB when the Mic/Line switch is set to “Mic”, and 0 dB when the switch is set to “Line”. If the control signal is on the RCA input, ducking begins at -30 dB.
HR70 DISPLAY -Channel Mhz - indicates Megahertz of FM transmission being sent - Mute indicator
REAR PANEL • 15VDC: USE THE ROLLS SUPPLIED PS27s ADAPTER ONLY!!! • Aux In: The Aux in is an input that will talk over the Line In (Main input) • Line in: This is the main line level input to the HR70. • Outputs: RCA stereo outputs. • Mic: XLR microphone input. • ANTENNA: Connects to the included BNC FM transmitting antenna.
CONNECTION - Connect the Rolls supplied adapter to the VDC power jack of the HR70, then to an AC outlet with the proper voltage. - Connect the HR70 Left and Right line input to a mixer, or other audio device. WE RECOMMEND TURNING THE DUCK SENSITIVITY FULLY CLOCKWISE (ALL THE WAY UP) TO START. THIS IS THE HIGHEST SENSITIVITY AND MOST DUCKING AVAILABLE ON THE UNIT. OPERATION If you are using a condenser microphone, switch the Phantom Power on. Set the level of the music signal (Line In) for a comfortable level. Speak into the microphone and adjust the Mic Level for a comfortable level, then adjust the Sensitivity so that the music is muted when speaking with a normal voice. Set the Release Time control for the amount of time you wish for the Aux In signal to return to normal.
