Digital Reference DR-1500 VHF Guitar Wireless System T4 Channel T3 Overall System. Operating frequencies VHF band: 169.505, 170.245, 171.905 MHz. Frequency stability: ±0.005%. Modulation mode: FM. Maximum Deviation ±15 kHz. Operating range: 200' minimum. Operating temperature range: 40 degrees F (4 degrees C) to 110 degrees F (43 degrees C). Frequency response: 80 Hz to 13 kHz. Receiver. Receiving sy ...