The Drake VMR806AG audio-video modulator is a synthesized, full range agile modulator covering 7 to 806 MHz.

This modulator is popular in schools, institutions, and with CATV companies because the frequency agile VMR806AG allows front panel pushwheel switch selection of standard CATV channels 2 through 125, CATV subband channels, T7 through T14, or VHF/UHF TV channels 2 through 69. This means the local operator can utilize "T" channels to return local origination programming to the control headend or generate signals on the desired operational channel.

The R.L. Drake VMR806AG Audio-Video Modulator is a high quality, vestigial sideband unit with synthesized visual and aural carriers. The aeronautical channels are offset positive with a tolerance of ±5 kHz as required by FCC rules.

The heterodyne conversion system, in conjunction with the use of a SAW filter, ensures optimum vestigial selectivity for adjacent channel headends. An optional FCC predistortion SAW response is also available for the VMR806AG.

The modulator is designed to accept any standard audio/video source such as NTSC video and audio baseband signals from a satellite receiver, TV camera, videotape recorder, TV demodulator, or similar signal source.

The modulator is designed to accept standard (negative sync) polarity video at 0.6 to 1.5 Vp-p level. All level controls are located on the front panel for ease of operation. Audio and video overmodulation indicators are provided. Output level is +45 dBmV and is adjustable over a 10 dB range.

Field-defeatable audio pre-emphasis allows transmission of BTSC encoded baseband stereo audio signals using a Drake stereo encoder. The AUDIO INPUT can also accept a 4.5 MHz audio modulated carrier by changing internal jumpers.