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Continental 816R-4B, Single Tube, 27.5 KW FM
Transmitter
GENERAL
Rated Power
Output:
816R-4B: 27.5 KW
Power Consumption:
816R-4B: 42 KW nominal
Tube Used:
4CX20,000
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
Output Connector:
31/8" EIA Flange
VSWR:
2:1, max.
Modulation Type:
Direct carrier frequency modulation
Modulation
Capability:
+
150 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, and self-contained
harmonic filter.
RF Harmonic
Attenuation:
-80 dB, min.
Power Supply Rectifiers:
Silicon
MONAURAL
OPERATION
Audio Input
Impedance:
600 ohms, balanced
Audio Input Return
Loss:
30 dB or better
Audio Input Level:
+ 10
dBm (6.93 volts
peak-to-peak) @ 600 ohms
for ±75 kHz deviation.
Audio Frequency
Response:
+0.5
dB; flat, 25, 50 or 75 microsecond
pre-emphasis, 20 Hz to 15KHz
Total Harmonic
Distortion:
0.08% max.; 20 Hz to 15 kHz
(Measured
with Spectrum Analyzer.)
Intermodulation
Distortion:
0.08% or less, 60 Hz/7 kHz 4:1
ratio
FM S/N Ratio (FM
Noise):
75 dB min. below +75 kHz
deviation @
400 Hz, measured within a 20 Hz to
15
kHz bandwidth with 75 microsecond
de-emphasis
Asynchronous AM S/N Ratio
(AM Noise):
55 dB RMS
below carrier; reference:
100% AM modulation, full power @
400
Hz with 75 microsecond de-emphasis,
no FM modulation
Synchronous AM S/N
Ratio
(incidental AM Noise):
40 dB below carrier; reference:
100% AM modulation,
full power @ 400Hz with 75
microsecond de-emphasis,
FM modulation + 75 kHz @ 400
Hz
WIDEBAND
OPERATION
Composite Inputs:
Balanced,
unbalanced and test
Composite
Input Impedance:
5,000 ohms,
nominal
Composite
Input Level:
1.25 volts RMS (3.54 volts
peak-to-peak)
for +75 kHz deviation
Composite
Amplitude Response:
+0.1
dB, 20 Hz to 100 kHz
Composite
Total Harmonic Distortion:
0.08% max
Composite
Intermodulation Distortion:
0.08% max.; 60
Hz/7 kHz 4:1 ratio
Two
SCA Inputs:
Balanced or
unbalanced
SCA
Input Impedance:
50,000 ohms,
nominal
SCA
Input Level:
1.25 volts RMS for ±7.5 kHz
deviation
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 parameters are influenced by the RF
system. These specifications assume that a "State-of-the-Art"
Stereo Generator is used.
Stereo Separation:
50 dB min.; 50
Hz to 15 kHz. (60 dB or
better, 400 Hz
to 7.5 kHz typical)
Total
Harmonic Distortion:
0.08% max.; 50 Hz to 15 kHz.
(Measured
with Spectrum Analyzer.)
Intermodulation Distortion:
0.08% max.; 60
Hz/7 kHz, 4:1 ratio.
FM
Noise:
-
72 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 parameters are influenced by the RF System. These
specifications 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 or 92
kH#
-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 92 kHz):
-50 dB, SCA reference deviation 5
kHz
and 200 Hz modulation frequency;
de-emphasis,
150 microsecond
ELECTRICAL
Power Source:
200 to 250 volts ac; 60 Hz, three
phase;
available transformer taps are 200,
210,
220, 230, 240, 250 volts ac; 50 Hz
available on request.
Permissible Line Voltage
Variation:
±5%
(each phase voltage variation:
within 5% of the average of all
three phases).
Filament regulator:
+1
%
of optimum
OPERATING
ENVIRONMENT
Operating
Altitude:
7,500 ft. (2286 m) standard;
optional to
10,000
ft (3048 m) with
modification kit
Ambient Temperature Range:
-
20º C to + 50ºC (- 4ºF to + 122ºF)
MECHANICAL
Size, as shown:
69" (1 75 cm) H
72" (1 83 cm) W
28" (71 cm) D
Weight:
1962 lb (890 kg) nominal
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