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Surplus Equipment

Used AM Transmitters

 
Used FM Transmitters
 
 
 
 
 
 
 
 
 

           

 BE FM 5B & 3.5B TECHNICAL SPECIFICATIONS

 

GENERAL

Power Output: FM3.5B, 3.5 kW (1.5 to 3.8 kW); FM5B & FM5B/S, 5 kW (2.5 to 5.5 kW)

Frequency Range: 87.5 to 108 MHz, tuned to specific operating frequency; exciter programmable in 10 kHz steps

RF Output Impedance: 50 ohm (others on special request)

Output Connector: 1 5/8" EIA flange

VSWR: FM3.5B, 2:1 maximum, FM5B & FM5B/S, 1.8:1 maximum (all will operate into higher VSWR with automatic power reduction)

Frequency Stability: 300 Hz, 0 to 50 C

Type of Modulation: Direct frequency modulation of carrier frequency

Modulation Capability: 350 kHz

Modulation Indication: Peak reading, color coded, LED display with baseband overmodulation indicator

Exciter: Solid state, 50 watt output, model FX50, incorporating a digitally programmed synthesizer. (10 kHz increments)

Pre-Emphasis:            FCC 75 uS, CCIR 50 uS (where specified), 25 uS (Dolby), or flat response, selectable

Asynchronous AM S/N Ratio: 55 dB below equivalent reference carrier with 100% amplitude modulation at 400 Hz, 75 uS de-emphasis (no FM modulation present)

Synchronous AM SIN Ratio: 40 dB below equivalent 3.5 kW (FM3.5B) or 5 kW (FM5B & FM5B/S) reference carrier with 100% AM modulation at 1 kHz, no de-emphasis (FM modulation 75 kHz at 1 kHz)

Tube Complement: (1) 4CX3500A

RF Harmonics: Suppression meets all FCC/DOC requirements and CCIR recommendations

Power Supply Rectifiers: Silicon

 

ELECTRICAL / MECHANICAL

AC Input Power: FM3.5B & FM5B/S, 208/240 Vac, 50/60 Hz, single phase, FM5B, 208/240 Vac Delta or WYE, 50/60 Hz, three phase (all include taps for 196 to 252 Vac; other voltages and line frequencies available upon request)

Primary Power Consumption: FM3.5B, 6.5 kW typical (at .92 pf) at 3.5 kW RF output, FM5B, 8.3 kW typical (at 92 pf) at 5 kW RF output; FM5B/S, 9.6 kW typical (at .98 pf) at 5 kW RF output

Overall Efficiency: FM3.5B, 54% typical; FM5B, 60% typical; FM5B/S, 52% typical (all AC line Input to RF output)

Size: (Transmitter) 34.3"W x 37.25"D x 70"H (87.1 x 94.6 x 175.8 cm)

Weight & Cubage: (Transmitter) FM3.5B, 1050 lbs (472.5 kg), 53 cu ft (1.5 cu m); FM5B & FM5B/S, 1000 lbs (450 kg), 53 cu ft (1.5 cu m)

Altitude: 10,000 ft at 60 Hz (3048 m), 7500 ft at 50 Hz (2286 m)

Ambient Temperature Range: -10 to +50 C

 

MONAURAL OPERATION

Audio Input Impedance: 600 ohm balanced, resistive, adaptable to other impedances, 60 dB common mode suppression

Audio Input Level: +10 dBm nominal for 75 kHz deviation at 400 Hz

Audio Frequency Response: 0.5 dB, 30 Hz to 15 kHz, selectable flat; 25, 50, 75 uS pre-emphasis

Total Harmonic Distortion + Noise: 0.02% or less at 400 Hz

SMPTE Intermodulation Distortion: 0.05% or less, 60 Hz/7 kHz, 4:1 ratio

CCIF Intermodulation Distortion: 0.02% or less, 15 kHz/14 k-Hz, 1:1 ratio

Transient Intermodulation Distortion: 0.02% or less, sine wave/square wave

FM S/N Ratio: FM3.5B & FM5B, 85dB (FM5B/S, 82 dB) below 75 kHz deviation at 400 Hz, measured in a 20 Hz to 30 kHz bandwidth with 75 uS de-emphasis.

 

WIDEBAND COMPOSITE OPERATION

Composite Inputs: 3 total, (1) unbalanced and (1) balanced plus front panel test; all connectors BNC

Balanced Composite Input Impedance: 10K or 50 ohm, nominal, resistive, selectable

Unbalanced Composite Input Impedance: 10K ohm, nomina1, resistive

Composite Input Level: 3.5 V p-p nominal, for 75 kHz deviation

FM S/N Ratio: FM3.5B & FM5B, 85dB (FM5B/S, 82dB below 75 kHz deviation at 400 Hz, measured in a 20 Hz to 30 kHz bandwidth with 75 uS de-emphasis

Composite Total Harmonic Distortion + Noise: 0.02% or less at 400 Hz

Composite SMPTE Intermodulation Distortion: 0.05% or less, 60 Hz/7 kHz, 1:1 ratio

Composite CCIF Intermodulation Distortion: 0.02% or less, 15 kHz/14 kHz, 1:1 ratio

Composite Transient Intermodulation Distortion: 0.02% or less, sine wave/square wave

Composite Amplitude Response: +0.05 dB, 30 Hz to 53 kHz

Composite Phase Response: 0.25 degrees from linear phase, 30 Hz to 53 kHz

Composite Group Delay Variance: 10 nanoseconds, 30 Hz to 100 kHz

Composite Slew Rate: 9 V/microsecond (symmetrical)

Subcarrier Inputs: (3) total, unbalanced, BNC connectors

Subcarrier Input Impedance: 100K ohm, nominal, resistive

Subcarrier Input Level: 3.5 V p-p, nominal, for 7.5 kHz deviation

Subcarrier Amplitude Response: 0.2 dB, 40 to 100 kHz

 

STEREO OPERATION

Modulation Type: Digitally synthesized stereo, digitally synthesized pilot; no pilot phase adjustment required

Audio Input Impedance: 600 ohm balanced, resistive, floating (adaptable to other impedances)

Audio Input Level: +10 dBm, 1 dB, for 100% modulation at 400 Hz (adaptable to other input levels)

Audio Input Filters: 15 kHz LPF with delay equalization for minimum overshoot

Frequency Response. 0.5 dB, 30 to 15,000 Hz, 75 uS pre-emphasis (flat, 25 or 5-0 uS pre-emphasis selectable)

Total Harmonic Distortion + Noise: 0.05% or less at 400 Hz

SMPTE Intermodulation Distortion: 0.05% or less, 60 Hz/7 kHz, 4:1 ratio

CCIF Intermodulation Distortion: 0.05% or less, 15 kHz/14 kHz, 1:1 ratio

Transient Intermodulation Distortion: 0.05% or less, sine wave/square wave

FM S/N Ratio: FM3.5B, 80 dB (FM5B, 82 dB; FM5B/S, 78 dB) below 75 kHz deviation at 400 Hz, measured in a 20 Hz to 30 kHz bandwidth with 75 uS de-emphasis

Stereo Separation: 50 dB or better; 30 to 15,000 Hz (sine wave)

Dynamic Stereo Separation: 50 dB or better; 30 to 15,000 Hz (normal program content)

Linear Crosstalk: Main to Sub/Sub to Main due to amplitude and phase matching of left and right channels, 30 to 15,000 Hz, 45 dB minimum below 100% modulation

Non-Linear Crosstalk: MaIn to Sub/Sub to Main due to distortion products. 70 dB minimum below 100% -modulation

38 kHz Subcarrier Suppression: 80 dB, minimum, below 100% modulation,

Pilot Stability: 0.5 Hz, O to 50 C