TX25 Plus & TX250 Plus FM

TỔNG QUAN

• The tx 25 plus and tx 250 plus fm exciters are designed to  accept stereo mono mpx audio signals to be modulated in fm and to amplify the rf. 
• The tx 25 plus and tx 250 plus fm are equipped with an innovative and high-performance power supply stage 
• «switching-mode mains direct», without mains transformer (the mains voltage can vary from 80 to 265 vac with no 
• variation on the output power). 
• Major features include high insulation from mains, high overall efficiency, modular design for friendly maintenance, compliance with european norms en61000-4-3 and long term 
• reliability.
• In these fm exciters, an agc audio circuit control is included to keep the modulation level below the maximum figures allowed in compliance with cept/erc 5401 e.
• The rf output specifications have been drastically improved, thus obtaining figures which are comparable to digital transmitters.
• These fm exciters can be controlled locally by a pc or remotely by modem.
• The tx 25 plus is a completely solid state exciter, frequency agile controllable from the front panel with adjustable output power up to 25 w.
• The power device used to obtain 25 w is the philips blf 245.

ĐẶC TÍNH KỸ THUẬT

FREQUENCY

• Range: 87,5 ÷ 108 MHz
• Internal Setting mode: 10 KHz steps
• External Setting mode: 10 KHz steps by remote control RS232-RS485
• Generation: PLL synthesizer
• Control:  Microprocessor
• Output frequency stability: ± 300 Hz / 3 months
• Reference: TCXO 12,8 MHz
• Nominal deviation: ± 75 KHz
• Stability of Frequency: Deviation ± 2,5 % over 6 months
• Impedance RF Connector: 50 Ohm

RF OUTPUT SPECIFICATIONS

• Harmonics suppression: < - 75 dBc
• Spurious Emission: < - 90 dBc
• Of   Lock Attenuation: > 60 dBc
• S/N RATIO (weighted): > 73 dB (referred to ± 75 KHz)
• THD: 0,10%
• VSWR: Less then 1,5:1
• Probe: BNC connector RF – 40 dB, BNC connector LF

MONO MPX SPECIFICATIONS

• Mono/MPX Impedance: 600 Ohm bal. or 10 KOhm unbal., XLR female Connector
• Mono Level: From - 6 to + 12 dBm
• MPX Level: - 6 dBm
• Audio Filter Response: > 30 dB (from 19 KHz to 100 KHz)
• THD: < 0,2% From 40 Hz to 15 KHz
• Suppression of 19 KHz: > 46 dB
• RDS and SCA Impedance: 10 KOhm unbal., BNC Connector (with 30 Hz to100 KHz Filter)

STEREO SPECIFICATIONS

• Left, and Right Impedance: 600 Ohm bal. or 10 KOhm unbal, XLR female Connector
• Left, Right Level: From – 6 to + 12 dBm
• Crosstalk: > 50 dB (@ 19 KHz)
• THD on Encoded channels:  < 0,3 % From 0,4 Hz to 15 KHz
• Suppression of 38 KHz:  > 50 dB
• Spurious suppression outside band: According to ETSI 300-384
• Sub Carrier Generation: Internal Cristal
• Pilot Frequency: 19 KHz ± 1 Hz

DESIGN DATA

• Type: Solid state direct FM frequency
• Pre –emphasis: Flat or 75 or 50 μs
• Audio frequency response: ± 0,2 dB (from 40 Hz to 15 KHz) (stereo), ± 0,3 dB (from 40 Hz to 100 KHz) (MPX)
• Unbalance rejection: > 40 dB
• Modulation Type: Direct VCO frequency modulation F3E/F8E
• Capability: Meets or exceeds all CE 99/ 05 R&TTE requirements

REMOTE CONTROL

• Output Connector: RS 232 – PC connection (front panel) RS 232, Amplii er connection (rear panel) RS 485 (rear panel)
• Input Connector: RS 485 (rear panel)

STANDARDS COMPLIANCE

• Radio spectrum: ETSI 300-384; ETS 302-018
• EMC: ETSI 300-447; ETS 301-489
• Safety: EN 60950 - EN 60215

TEMPERATURE

• Operating range: 0° to 45° C
• Storage range: - 40° to 60° C
• Maximum relative Humidity: 90% non condensing
• Max Operating: Altitude 2500 mt. a.s.l.