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D816HD Series High Power FM Transmitters  
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Specifications-- D816HD Series High Power FM Transmitters

General

Operating Environment

Operating Altitude
7,500 ft. (2,286 m) standard
10,000 ft. (3,048 m) with high
altitude blower modification kit
Ambient Temperature Range
-4°F (-20°C) to +122° F (+30° C)
 
Relative Humidity
0 to 95%
 
 
Mechanical
Transmitter (each transmitter)
73” (185.5 cm) H,
72” (183 cm) W, 28” (71 cm) D
 
Weight (each transmitter)
1,962 lbs. (890 kg) Nominal
 


Electrical
Power Source
200-250 VAC; 60Hz, 3 phase
available taps: 200, 210, 220,
230, 240, 250 VAC
50 Hz available
 
Permissible Voltage Variation
+/- 5% (each voltage
variation within 5% of
average of all 3 phases
 
Filament Regulator
+/- 1% of optimum
 
 

Standard Features

Easy Access (Serviceability)
Positive Pressure Cabinet
Soft Start™
Automatic Power Control
AC Power Recycle
VSWR Protection and Auto Fold Back
Output Surge Suppressor for instantaneous
  VSWR mismatches
Dual Redundant IPA Driver Modules
Reliable and Inexpensive Final Tube
Broadband Quarter-wave Cavity
Fully Self-contained Cabinet
Phase Loss Protection
Filament Voltage Regulation
816HDR transmitters easily field upgradable to

low-level combined HD
Positive pressure cabinet reduces impact of dust
  and other contaminants
Filtered air intake and PA exhaust located on
  cabinet top
2 year limited parts warranty
24/7/365 parts and field service
Tetrode Power Tube:
D816HD-20: 4CX20000E
D816HD-20C: 4CX20000C
D816HD-25: 4CX25000C
D816HD-28L: 4CX30000L (liquid cooled)
 
Rated Analog TPO (1% HD, -20dBc)
D816HD-20: 40kW
D816HD-20C: 44kW
D816HD-25: 50kW
D816HD-28L: 56kW
 
Rated Analog TPO (4% HD, -14dBc)
D816HD-20: 36kW
D816HD-20C: 38kW
D816HD-25: 46kW
D816HD-28L: 54kW
 
Rated Analog TPO (10% HD, -10dBc)
D816HD-20: 25kW
D816HD-20C: 27kW
D816HD-25: 34kW
D816HD-28L: 38kW
 
Frequency Range
88 to 108 MHz
 
Output Impedance
50 Ohms
 
Output Connector
3-1/8” EIA Flange
 
VSWR
2:1, maximum
 
RF Harmonic Attenuation
-80 dB, minimum
 
FM S/N Ratio (FM Noise)
75 dB Minimum
 
Asynchronous AM S/N Ratio (AM Noise)
55 dB below carrier;
Reference 100% modulation,
full power, with 75 microsecond
de-emphasis, no FM Modulation
 
Synchronous AM S/N Ratio
50 dB below carrier; reference
100% modulation, full power,
with 75 microsecond de-emphasis,
FM Modulation +/- 75 kHz
@ 400 Hz
 
Total Harmonic Distortion
0.08% Maximum; 20 Hz to 15 kHz
 
Intermodulation Distortion
<0.08%, 60 Hz/75 kHz, 4:1 Ratio