Rolls HR70 FM Broadcast Transmitter

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 --87.5 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 micro power RF transmitter and requires no FCC license, for it to function properly good RF practices still apply. The wire antenna that is provided is set up for the middle of the band or about 92MHz. For any transmitter to operate at its's best, it must be earth grounded. You can think if it sort of "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 of 150' or more down to 30' or so. Some experimenting may be required at your venue to find the optimum installation for your situation.

Rolls HR70 Features

• Simple way to broadcast signals over FM
• Clean simple design
• All metal chassis

• HR70 Digital FM Transmitter1
• Antenna1
• DC Power Supply1
• Frequency Response 20 Hz - 12.5 kHz
• Antenna Impedance 50 ohm
• Power 12 - 15 VDC 500mA 5 x 1.2 mm DC Jack
• PowerLED 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
• Antenna Jack RP-SMA
• Input Impedance
  • 100KΩ Unbalanced
  • 600Ω Balanced Indicators