Specifications

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Section 1: Headend Equipment
Demodulators
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Frequency Agile Demodulator
The Model HDM-1, frequency agile demodulator, has been designed to receive and demodulate all UHF, VHF, and
CATV channels to baseband audio, video and multiplex signals. The HDM-1 uses a microprocessor driven PLL
synthesized tuning circuit to assure precise tuning and accuracy. The microprocessor controls all functions and
provides for easy channel selection using front panel channel up/down buttons and a large LED display.
Low Distortion Demodulation
Agile Input: UHF, VHF, CATV
SAW Filtered
Adjustable Audio & Video Outputs
Microprocessor Controlled PLL Tuning
Front Panel LED Channel Display
4.5 MHz Multiplex Output
BTSC Stereo Output
Ordering Information
HDM-1
Two video outputs
Composite IF output
Stereo and SAP audio outputs
4.5 MHz audio subcarrier output
Commander 6® NTSC Frequency Agile Demodulator
The Commander 6® Broadcast Demodulator (C6BD-II) is a precision, high performance demodulator used in
Headend Signal Processing and Monitoring applications. Standard features include synchronous detection, two video
outputs, aural subcarrrier output, stereo, and SAP outputs. A non-volatile memory can store and recall twenty
different preset configurations.
The selected input channel frequency is displayed on the two line, twenty character LCD display. Local operator
control is performed with the user-friendly keypad interface. Using the five push-button cursor keys , the user can
select the input frequency in 0.25 MHz steps. The LCD is illuminated and uses “supertwist” technology for wide
angle viewing. The C6BD-II is rack mountable when installed in the chassis model C6BDCH, a 2RU chassis that
holds two C6BD-II units side by side. The C6BDCH has built-in ventilation allowing for stacking any headend unit
directly on top or underneath without spacing, resulting in maximum space efficiency. The C6BDCH is required for
rack mounting the C6BD-II.
Space efficient
RF or IF input
Frequency agile tuning in 0.25 MHz steps
Ordering Information
C6BD-II ....................................Frequency Agile Demodulator
C6BDCH .................................. 2 RU Chassis, holds two C6BD-II units
Input Channels ........................................VHF: 2-13 (54-216 MHz)
UHF: 14-69 (470-810 MHz)
CATV: 2-99 (54-650 MHz)STD,HRC
Input Range:............................................–5 to +30 dBmV
Video Output:...........................................5–2V p-p, 75 ohms
Audio Ouput:............................................2 – 2V p-p, 600 ohms
Holland
Electronics LLC