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Sielco POLY30D

Digital 30W FM Exciter

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POLY30D is the 30W digital exciter of the innovative POLYHEDRA family, produced by Sielco. It is appreciated for the high efficiency and versatility due to three main reasons: LIGHT weight, MINIMUM size and LOW consumption. The SIELCO DIGITAL FM MODULATOR is a new digital FM modulator / exciter offering RF output power adjustment up to 30 dBm over the complete FM band (87,5 ~ 108.00Mhz).

The system is designed according to all the latest digital technologies with modern digital components, FPGA and DSP.

The equipment is supplied with a complete analog and digital audio interface including audio IP.

With 5 kg and compact dimensions in 2U, the transmitter is easy to transport and easy to install in any 19″ rack. Many options are available on request.

  • State of art of the transmitter performances
  • LCD color display with rotary encoder for easy setting and reading parameters
  • Extremely low distortion: THD, IMD & TIM
  • Highest stereo performances.
  • MPX, L/R, SCA1, SCA2 primary and reserve.
  • AES-EBU XLR & Optical, Audio IP.
  • Remote control for telemetry LAN, RS485 and web server.
  • All digital DSP processing and elaboration.
  • DSP board add-on for SFN applications.
  • Memory for different function settings (frequency, sensitivity, power, etc.).
  • N+1 system management included.
  • High performances stereo encoder included.
  • Proprietary RDS option included.

Technical Data

  • Frequency range:from 87,5 to 108 MHz other ranges available on request
  • Transmitter tuning steps:10/100 KHz
  • Modulation Type:FM – Digital Direct Carrier Frequency FM Modulation
  • Audio and Mpx input level:from -6 to +12 dBm @ 75 KHz deviation
  • Auxiliary input channel level:SCA – from -12,5 to +3,5 dBm @ 7,5 KHz deviation
  • RDS – from -24 to -8 dBm @ 2 KHz deviation
  • Modulation distortion:75 KHz dev. – 0.02% typical
  • S/N ratio, mono:30÷20000Hz – >76 dB, 83 typical
  • CCIR – >75 dB, 79 typical
  • S/N ratio, stereo:30÷20000Hz – >72 dB, 77 typical
  • CCIR – >68 dB, 72 typical
  • Audio channels frequency response:30÷15000 Hz – ±0.1 dB
  • MPX input frequency response:30÷100000 Hz – ±0.1 dB
  • Pre-emphasis time constant:0μS, 50μS (CCIR), 75μS (FCC)
  • Rated RF output power:30W
  • Output power ALC stability:±3%
  • Harmonic and spurious emissions:<70dB (harmonic), <80 dBc (spurious)
  • GPS Synchronization:External / Internal with Digital PLL
  • RF output connector:N
  • Power supply:Single phase – 115÷230 Vac +10/-15%
  • Three phase – N.A.
  • Total consumption at rated RF power:85W
  • Operative temperature range:suggested – from 0 to 35 °C
  • extreme – from -10 to +45 °C (50°C max with derating)
  • Relative humidity:up to 95% not condensing
  • Dimensions (WxHxD):483x88x440 mm
  • Weight:5kg

POLY30D Brochure


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