RF Enables Communications
 
802B FM Exciter  
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Specifications
 
 
 

 

Specifications-- 802B FM Exciter

GENERAL

RF Power Output
5 to 50 W, continuously adjustable.

RF Output Impedance
50 ohms, VSWR less than 2:1 for full output,
protected for open and short circuit; BNC connector

Harmonic and Spurious Output
60 dB or more below rated outpu.

Frequency Range
87.5 to 108 MHZ in 10 kHz steps.

Frequency Control & Stability
Phase locked loop frequency synthesis from highly stable master oscillator, +/-250 Hz.

Modulation Type
Direct carrier FM
from LVDS input signals to Analog FM.

Modulation Capability
+/- 250 kHz.

Modulation Indication
Bargraph: 5% increments; Digital meter: 0.1% resolution

MONAURAL OPERATION

Audio Input Impedance
600 ohms, +/-5%

BalancedAudio Input Level
+10 dBm +/-2 dB (6.93 volts peak-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
0.005%

Intermodulation Distortion
0.005%, 60 Hz/7 kHz, 4:1 using CCIR-2k filter

FM S/N Ratio (FM Noise)
90 dB @ 400 Hz, 75 microsecond de-emphasis measured using "A" weighted filter

Asynchronous AM S/N Ratio (AM Noise)
-70 dB

Synchronous AM S/N Ratio (Incidental AM Noise)
-60 dB

 

ENVIRONMENTAL

Temperature Range
-4 to +131 degrees F (-20 to +55 degrees C)

Altitude Range
0 to 15,000 ft. (4,572 m)

Relative Humidity Range
0 to 95%, non-condensing.

 

COMPOSITE OPERATION

Composite Inputs
Balanced, unbalanced and test

Composite Input Impedance
5,000 ohms, nominal

Composite Input Level
1.25 volts RMS (3.50 volts peak-to-peak) for +/-75 kHz deviation

Composite Amplitude Response
+/-0.2 dB, 20 Hz to 100 kHz

Composite Phase Response
+/-0.5 degrees, 20 Hz to 75 kHz

Composite Group Delay Variation
+/-25 ns, 20 Hz to 75 kHz

Composite Total Harmonic Distortion
0.005% using "A" weighted filter

Composite Intermodulation Distortion
0.005%, 60 Hz/7 kHz, 4:1 using CCIR-2k filter

Composite FM S/N Ratio (FM Noise)
90 dB @ 400 Hz, 75 microsecond de-emphasis measured using "A" weighted filter

Three SCA Inputs
Balanced or unbalanced

SCA Input Impedance
15,000 ohms, nominal

SCA Input Level
1.25 volts RMS for 10% injection

SCA Amplitude Response
+/-0.3 dB, 40 kHz to 100 kHZ

 

STEREO OPERATION

Most stereo performance parameters are determined by the stereo generator used. The following parameters are influenced by the RF system. These specifications assume that the stereo generator is a state-of-the-art generator.

Stereo separation
50 dB minimum; 50 Hz to 15 kHz  (60 dB or better, 400 Hz to 7.5 kHz typical).

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.

 

MECHANICAL

Size
17.5 in. (44.45 cm) wide, centered in a 19 in. (48.26 cm) rack-mounting panel; 22 in. (55.88 cm) deep; 5.25 in. (13.34 cm) high

Weight
31.5 lbs. (14.3 kg)

Mounting
Equipped with rack mounting sides

 

 

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