Bext Radio Transmitters

  • Solid StateLEX 1RU compact FM exciter                   

    • EZ 30               
  • 30 Watts of Frequency Agile FM Power in a one rack space, ultra compact size
  • Fast access to all functions & parameters from front panel via user-friendly menu display
  • Instant frequency programmability directly from front panel
  • Proportional Auto-Foldback of output power in the event of excessive VSWR
  • Adjustable power output from approximately 1 to 30W with soft-start control
  • Automatic power control maintaining the output at any pre-set level
  • Modular layout with plug-in, easily replaceable circuits and parts
  • Full voltage range operation, 95 to 260 volts
  • Meets or exceeds all FCC and CCIR requirements
  • Includes low pass/harmonic filter and can be used as a stand-alone transmitter
  • Can be used as part of a translator when used in conjunction with a compatible receiver
  • Available with Optional built-in Stereo Generator Card (please specify with order)
  • Available with Optional built-in RDS Generator Card (please specify with order)
 
RF SPECIFICATIONS

Nominal RF power:

30W adjustable from approx. 1W to full power

RF output impedance:

50 Ohms unbalanced, VSWR less than 1.5:1

RF connector:

N Type Female
Frequency range: 87.5-108 MHz programmable in 10 kHz steps, synthesized,  microprocessor controlled.

Off lock attenuation:

better than - 80 dBc

Lock-in time:

typical < 4 sec.

Type of Modulation:

F3E / F8E direct FM at carrier frequency

Frequency deviation: 

+/- 75 KHz = 100%, +/- 150 kHz capability
Reference:

12.8 MHz TCXO

Stability of freq. dev:

+/- 2,5 % over 6 mo.

Consistency of deviation over range:

< +/- 2 % from 87.5 to 108 MHz

Frequency drift:

2 kHz per year or better (due to internal TCXO aging). Can be user calibrated.

Short term stability:

+/-  1 ppm from -5 to +45 C (100 Hz @ 100 MHz)

RF Harmonics:

Exceeds EBU/ CCIR/FCC requirements better than -70 dBc

RF Spurious: 

Exceeds EBU/ CCIR/FCC requirements, better than -90 dBc min @ +/- 1 MHz

RF Monitor:

-43 dBc+/-3 dB from 87.5 to 108 Mhz (not suitable for harmonics measurement)
AUDIO GENERAL SPECIFICATIONS

Preemphasis: 

Flat/50/75 microseconds, internal jumper selectable

Preemphasis precision:

better than +/- 0.5 dB

Stereo System:

CCIR / FCC "pilot tone system"

Wideband Distortion, THD:

Less than 0.1% (typ. 0.05%)

Wideband Intermodulation (IMD):

Less than 0.1%(typ. 0.05%)

Wideband Transient IMD:

< 0.25 % (square / sine Wave)

Wideband Amplitude Response:

+/- 0.2 dB, 20 Hz to 100 kHz

Wideband Asynchronous AM : 

Better than -68dB (Typical -80dB)

COMPOSITE SPECIFICATIONS
Stereo Separation: 30-80 Hz > 50 dB, 80 Hz-15 kHz > 60 dB (typ.65)
Crosstalk attn. Main to Sub & Sub to Main): Better than 50 dB
Audio Spurious Products attenuation:  Better than 50 dB 53 kHz to 100 kHz
38 kHz Suppression:  Better than 50 dB (Typical 80 dB)
38 kHz Tone Generation:  Internal Crystal
38 kHz tone Precision: 38 kHz +/- 2 Hz
Pilot Tone frequency: 19 kHz +/- 1 Hz
Phase response: 19/38 kHz 0 degree +/- 2 degrees internally adjustable
THD on L & R channels:  Better than 0.03% 30 Hz - 15 kHz
IMD: 70 Hz / 6 kHz 4:1 RATIO Better than 0.03%
Transient IM: Better than 0.03% (square / sinus)
Audio response: +/- 0.15 dB 20 Hz to 15 kHz
Pilot Tone Deviation:  +/- 7 kHz nominal
S/N: Typical Values referred to +/- 75 kHz: Weighted (CCIR 468/2- Peak CCIR detector) 75 dB / 50 microseconds 69 dB / flat;   Weighted (CCIR 468/2 - RMS detector) 79 dB / 50 microseconds 72 dB / flat;  Unweighted (RMS detector, 20 Hz-23 kHz) 86 dB / 50 microseconds 80 dB / flat (stereo); Unweighted (RMS detector, 20 Hz - 23 kHz) 92 dB/50 microseconds 88 dB/flat (mono)
AM Synchronous:  (AM = 400 Hz, FM = 400 Hz +/- 75 kHz Ref. = 100 % AM, RMS detector, BW 20 Hz-23 kHz) better than -69 dB
AM Asynchronous: FM = no modulation, Ref. = 100 % AM, Unweighted, RMS detector, BW 20 Hz- 23 kHz) better than -70 dB typ. -85 dB
Common mode rejection Better than 45 dB Typical 25 Hz to 15 kHz.
AUDIO INPUTS
AUX Input (Can be used for SCA or external RDS):

1 BNC conn, unbalanced, Z nominal 2.2 kOhms.Input range is 0.5V to 2V RMS for 7.5 kHz deviation, adjustable through trimpot on back panel.

MPX Input: 

1 BNC conn., unbalanced, Z nominal 2.2 kOhms. Two available input ranges: 0.775V to 1.73V RMS or 1.73V to 3.8V RMS selectable through internal jumpers, with fine adjustment trimpot on back panel.

L & R + Mono Input (L+R only avail. with optional stereo card):

1 or 2 XLR connectors, balanced or unbalanced, Z nominal 10 kOhm +/- 1 % or 600 Ohm +/- 1 %, internal jumper selectable; input evel 0.55V to 2.45V RMS@ 75 kHz Deviation, adjustable through back panel trimpots

OTHER CONNECTORS
19 kHz Output (Available only with optional stereo generator):  1 BNC connector, unbalanced Z nominal: 5k Pilot = 1 Vpp 19 kHz Squarewave
Telereadings / telecontrol :  DB 9 on back panel. Provides readings for FWD PWR, PA Voltage and Current, Interlock contact closure.
RF Monitor (Not suitable for harmonics Measurements) : 1 BNC Connector on back panel
RS Programming (Optional): 3.5 mm jack (three contacts type)
ENVIRONMENTAL
Storage temperature: -20 C to +60 C
Operating temperature: 5 C to 45 C
Guaranteed performance temp: 0 C to +40 C
Relative humidity: 90% (non condensing)
Max operating altitude: 2000 m.
Cooling: Forced air (internal low noise blower)
PHYSICAL & ELECTRICAL
Front Panel: 483 mm (19") Wx 44mm (1 3/4") H (One standard rack space high)
Overall Depth:  385 mm (15-1/4")
Weight: Approx. 4 kg (8.8lbs)
Cabinet: Stainless steel
AC Power: Full voltage range power supply (95 to 260 volts single phase); approx power consumption: 80VA @ full power.
LCD Display Readings: Forward Power; Refl. Power; Frequency; Modulation level; P.A. current; L & R Input levels (Only with optional stereo generator card).

(c) 2010 BEXT Corporation USA

(c) 2004 BEXT Corporation USA