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Continental 815C,
5 KW, Solid State, FM Transmitter
General
Frequency Range: 88 to 108 MHz, in 10 KHz steps.
Frequency Control: Phase-locked loop frequency synthesis from
high-stability master oscillator.
Frequency stability: ±250 Hz
Output Impedance: 50 ohms
VSWR: 2:1, maximum
Modulation Type: Direct-carrier frequency modulation
Modulation Capability: ±200 KHz deviation
Modulation Indication: Digital LED display shows true peak level of
modulating signal in 5% increments with accuracy better than ±2%
Exciter: Solid-state unit with variable output of 5 to 50 watts;
self-contained harmonic filter.
RF Harmonic Attenuation: -80 dB, minimum.
Power Supply Rectifiers: Silicon
Power Source: 200 to 250 VAC; 60 Hz, single-phase; available
transformer taps are 200, 210, 220, 230, 240, 250 VAC; 50 Hz
available on request.
Permissible Line Voltage
Variation: ±5%
Operating Environment
Altitude: 0 to 7,500 ft (0 to 2,286 m) standard, optional to 10,000
ft (3,048 m) with modification kit.
Ambient Temperature Range: 0°C to + 50°C (+32°F to + 122°F)
Relative Humidity: 0 to 95%
Monaural Operation
Audio Input Impedance: 600 ohms, ±5% balanced
Audio Input Level: +10 dBm, ±2 dB (6.93 V peal-to-peak at 600 ohms)
for ±75 KHz deviation.
Audio Frequency Response: ±0.5 dB flat, 25, 50 or 75 microsecond
pre-emphasis, 20 Hz to 15 KHz.
Total Harmonic Distortion: 0.08% maximum; 50 Hz to 15 KHz.
Intermodulation Distortion: 0.08% SMPTE method.
FM S/N Ratio (FM Noise): 80 dB below ±75 KHz deviation at 400 Hz.
Asynchronous AM S/N Ratio (AM Noise): 55 dB RMS below carrier:
reference: 100% AM modulation, full power at 400 Hz with 75
microsecond de-emphasis, no FM modulation.
Synchronous AM S/N Ration (Incidental AM Noise): 50 dB below
carrier; reference: 100% AM modulation, full power at 400 Hz with 75
microsecond de-emphasis, FM modulation ±75 KHz at 400 Hz.
Composite Operation
Composite Inputs: Balanced, unbalanced and test.
Composite Input Level: 1.25 V RMS (3.54 V peak-to-peak) for ±75 KHz
deviation.
Composite Amplitude Response: ±0.2 dB, 20 Hz to 100 KHz.
Composite Total Harmonic Distortion: 0.08%, 50 to 15 KHz.
Composite Intermodulation Distortion: 0.08%, SMPTE method.
Three SCA Inputs: Balanced or un-balanced.
SCA Input Impedance: 15,000 ohms, nominal
SCA Input Level: 1.25 V RMS for 10% injection
SCA Amplitude Response: ±0.3 dB, 40 KHz to 100 KHz
Stereo Operation
Most stereo performance parameters are determined primarily by the
stereo generator used. The following specifications are influenced
by the RF system and assume that a state-of-the-art stereo generator
is used.
Stereo Separation: 50 dB minimum; 50 Hz to 15 KHz (60 dB or better,
400 Hz to 7.5 KHz typical).
Total Harmonic Distortion: 0.08% maximum; 50 Hz to 15 KHz (Measured
with spectrum analyzer).
Intermodulation Distortion: 0.15% maximum; 60 Hz/7 KHz; 4:1 ratio.
FM Noise: -70 dB referenced to 400 Hz, 75 KHz deviation. Measured
with 75 microsecond de-emphasis within a 20 Hz to 15 KHz bandwidth.
Linear Crosstalk: -55 dB
SCA Operation
Most SCA performance parameters are determined primarily by the SCA
generator used. The following specifications are influenced by the
RF system and assume that a state-of-the-art SCA generator is used.
Crosstalk, SCA to Main and Stereo (67 KHz and/or 92 KHz): -60 dB,
SCA deviation 5 KHz; main 75 microsecond de-emphasis.
Crosstalk, Main and Stereo to SCA (67 KHz and/or 92 KHz): -50 dB,
main and stereo 75 KHz deviation; SCA reference deviation, 5 KHz and
200 Hz modulation; SCA de-emphasis, 150 microsecond.
Crosstalk, SCA to SCA (67 KHz and/or 92 KHz): -50 dB, SCA reference
deviation; 5 KHz and 200 Hz modulation frequency, 150 microsecond
de-emphasis.
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815C
Rated Power Output: 5 kW
Power Consumption: 8.3 kW nominal
Output Connector: 1-5/8” EIA Flange
Size: 72” (183 cm), 35” (89 cm) W, 31” (79 cm) D
Weight: 1,100 lbs (500 kg) nominal
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