OPTIMOD-FM TECHNICAL DATA
6-5
HD (High Definition Digital Radio) Option
Configuration: Two field-installable cards: DSP and Input/Output. The DSP receives the
output of the multiband limiter and processes it through a look-ahead peak limiter that
operates in parallel with the main FM peak limiting system. The DR and FM outputs are
always simultaneously active.
Frequency Response: Frequency response from input to HD output is ±0.10 dB, 2.0 Hz–15
kHz; there is no pre-emphasis.
Sync Input: Used for synchronization of the HD Digital Output signal to an external refer-
ence provided at this input. Other specifications as in Digital Sync Input on page 6-3.
Digital Output: Stereo per AES/EBU standard. Designed to feed digital transmission paths
without pre-emphasis; output is flat. Other specifications as in Digital Audio Output on
page 6-3.
Analog Output: L and R. Can supply output of HD look-ahead limiter, input to HD look-
ahead limiter, or low-delay monitor signal. Output is flat. Other specifications as in Ana-
log Audio Output on page 6-3.
Relative Time Delay between FM and HD Outputs: HD output is delayed by 10.500 ms
with respect to the FM AES/EBU digital output under all operating conditions (excluding
BYPASS and TEST modes)..
Remote Computer Interface
Configuration: TCP/IP protocol via direct cable connect, modem, or Ethernet interface.
Suitable null modem cable for direct connect is supplied. Modem, Ethernet PC Card, and
other external equipment is not supplied.
Connectors: RS–232 port (2) dB–9 male, EMI-suppressed. Ethernet or Modem card sup-
ported with rear-panel PC Card slot.
Remote Control (GPI) Interface
Configuration: Eight (8) inputs, opto-isolated and floating.
Voltage: 6–15V AC or DC, momentary or continuous. 9VDC provided to facilitate use with
contact closure.
Connector: dB–25 male, EMI-suppressed.
Control: User-programmable for any eight of user presets, factory presets, bypass, test
tone, stereo or mono modes, analog input, digital input.
Filtering: RFI filtered.
Power
Voltage: 100–132 VAC or 200–264 VAC, switch-selected on the rear panel, 50–60 Hz, 50
VA.
Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
Grounding: Circuit ground is independent of chassis ground’ can be isolated or connected
with a rear panel switch.
Safety Standards: ETL listed to UL standards, CE marked.
Environmental
Operating Temperature: 32° to 122° F / 0° to 50° C for all operating voltage ranges.
Humidity: 0–95% RH, non-condensing.
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