HARRIS HT
20FM SPECIFICATIONS
 GENERAL
POWER OUTPUT: 8,000 to 20,000 watts
(FCC type-notified range) FREQUENCY RANGE: 87.5 to 108 MHz in 50 kHz
steps. Tuned to single frequency.
EXCITATION: Harris DIGIT High Power FM
Exciter
TYPE OF MODULATION: Direct carrier
frequency modulation (DCFM) MODULATION CAPABILITY: ±200 kHz
RF LOAD IMPEDANCE: 50 ohms
RF OUTPUT TERMINATION: 3 1/8," EIA
flange, female
PA MATCHING RANGE: 1.7:1 VSWR, maximum
for full output power;
automatic power
reduction into high VSWR's
RF HARMONIC/SPURIOUS OUTPUT:
Suppression meets or exceeds FCC/DOC/CCIR specifications
AC INPUT POWER: 197-250 VAC, 50/60 Hz,
three phase, 3-wire closed delta or 4-wire 360-415 VAC WYE.
POWER CONSUMPTION: 30.8 kW typical at
20 kW RF output (0.95 PF)
AMBIENT TEMPERATURE RANGE: -20 to
+50°C at sea level; derated 2°C/1000 ft altitude
MAXIMUM ALTITUDE: 10,000 ft (50/60 Hz)
MAXIMUM HUMIDITY: To 95%
non-condensing
AIR REQUIREMENTS: Main Cabinet: 760
CFM (60 Hz), 710 CFM (50 Hz);
Power
Supply: 250 CFM (60 Hz). 200 CFM (50 Hz) at zero back pressure
CABINET SIZE: 33.4"W (85 cm) x 30.2"D
(77 cm) x 72"H (183 cm);Power
Supply: 48"W (122 cm) x 24.1"D (61 cm) x 60.25"H (153 cm)
WEIGHT/VOLUME: 2,550 Ibs/150 cu. ft.,
domestic packed
WIDEBAND COMPOSITE OPERATION
(STANDARD)
INPUTS: Two; one balanced, floating
and one unbalanced.
INPUT IMPEDANCE: 2000 ohms resistive.
INPUT CONNECTORS: Female BNC (rear
panel).
INPUT LEVEL: 1.0 volt RMS nominal for
±75 kHz deviation.
AMPLITUDE RESPONSE: ±0.l dB, 30 Hz to
53 kHz; -0.2 dB at 100 kHz.
FM SIGNAL TO NOISE: 80 dB below 100%
modulation (reference 400 Hz at ±75 kHz deviation with 75
microsecond de-emphasis, 20 Hz to 200 kHz bandwidth).
HARMONIC DISTORTION: 0.08%
INTERMODULATION DISTORTION: 0.02% (60
Hz/7 kHz 1:1 tone pair).
CCIF INTERMODULATION DISTORTION: All
distortion products below 80 dB (reference 14 kHz/15 kHz test tone
pair).
ASYNCHRONOUS AM SIGNAL TO NOISE: 55 dB
below equivalent 100% amplitude modulation
SYNCHRONOUS AM SIGNAL TO NOISE: 50 dB below equivalent 100%
amplitude modulation of output carrier with 75 microsecond
de-emphasis (FM modulation ±75 kHz @ 400 Hz).
PHASE RESPONSE: +0.5/-1.0 degrees from
linear phase, 20 Hz to 53 kHz.
TRANSIENT INTERMODULATION DISTORTION:
0.05%, 2.96 kHz square
wave/14 kHz sine wave
modulation.
TEST INPUT (FRONT PANEL): Nominal 1.0
volt for ±75 kHz deviation at 400 Hz (10,000 ohm input impedance,
BNC female connector)
TEST OUTPUT (FRONT PANEL): Nominal 1.0
volt for ±75 kHz deviation at
400 Hz (200 ohm source
impedance, BNC female connector)
MONAURAL OPERATION (STANDARD)
AUDIO INPUT IMPEDANCE: 600 ohms,
balanced, resistive, transformerless.
AUDIO INPUT LEVEL: + 10 dBm, ±1 dB for
±75 kHz deviation at 400 Hz.
AUDIO FREQUENCY RESPONSE: Standard 75
microsecond FCC pre-emphasis curve ±0.5 dB, 30 Hz-15 kHz.
Selectable: flat, 25, 50 or 75-microsecond re-emphasis.
HARMONIC DISTORTION: 0.08%, 30 Hz to
15 kHz, de-emphasized.
INTERMODULATION DISTORTION: 0.04%, 60
Hz/7 kHz test tone pair, 4:1 atio.
CCIF INTERMODULATION DISTORTION: All
distortion products down 70 dB (reference 14 kHz/15 kHz test tone
pair).
TRANSIENT INTERMODULATION DISTORTION:
0.05%, 2.96 kHz square wave/14 kHz sine wave modulation
FM
SIGNAL TO NOISE RATIO: At least 80 dB below 100% modulation
(reference 400 Hz @ ±75 kHz
deviation, measured 20 Hz to 200 kHz bandwidth, 75 microsecond
de-emphasis).
SCA
INPUTS (STANDARD)
EXTERNAL SCA GENERATOR INPUTS: Two
INPUT
CONNECTORS: BNC female (rear panel).
INPUT
IMPEDANCE: 10,000 ohms, unbalanced.
INPUT
LEVEL: 0.1V (nominal) for 10% injection.
RANGE OF SUBCARRIER FREQUENCIES: 57
kHz to 92 kHz (25 kHz to 92 kHz in monaural operation).
AMPLITUDE RESPONSE: +0.1 dB, -0.2 dB;
20 kHz to 100 kHz.
SPECIFICATIONS
ARE REFERENCED TO 20 kW OPERATION, EXCEPT WHEN NOTED.
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