This is the low cost version, but is not intended for the novice or beginners. The audio input is raw MPX without any audio limiting or stereo coder circuitry, this must be provided externally in accordance with the recommendations of http://www.aareff.com/ETR132.pdf.
This is identical to Mono/MPX version but with a stereo coder built in. RDS cannot be used with this. Again it does not include audio limiting, so it's not recommended for the novice or beginner. External limiting need to comply with the recommendations of http://www.aareff.com/ETR132.pdf
Stereo and Audio Processing
Most small radio stations and beginners will use this version, this is because it includes audio processing circuitry and suitable limiting to keep the transmitter in compliance with the maximum bandwidth permitted by the international regulations. There is also access to the MPX in and out on the back panel which allows all known RDS units to be connected.
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All these models comply with European standards ETS 300384 for R&TTE, EN 301 489-11 for EMC and (LVD) 2006/95/EC for safety, the relevant FCC sections of US 47 CFR Part 73 for verification and ITU-R BS.450-3 (11/01) FM Broadcasting at VHF.
On the underside of this unit controls are accessible to set the:
- RF power output level anywhere from 1W to 12 W
- Pre-emphasis to 50 or 75 uS
- Frequency between 87.5 to 108 MHz
All the versions of this transmitter will operate with a power supply of 12-15V DC (2.5 amps) or worldwide mains 90 to 260V AC.
|Version||MPX||Stereo||Stereo and Audio Processor|
|Signal To Noise Ratio||80dB||65dB||65dB|
|Audio Distortion||0.02% THD Max.||0.02% THD Max.||0.02% THD Max (at MPX section).|
RF Technical Specifications
|Audio Input Sensitivity||+4 dBu for +/- 75 KHz dev.|
|Freq Stability||+/- 1 KHz max. typ. +/-300 Hz|
|Deviation Sensitivity Stability||+/-2 % max|
|Freq Fine Adj||> +/- 1000 Hz|
|Pre-emphasis||(50 uS/ 75 uS/ None) Selectable|
|Audio Input Connector||Phono/ RCA type unbalanced sockets|
|Power Output||Adj. 1-12 Watts into 50 ohms|
|Freq Range||87.5 to 108 MHz in 100 KHz steps|
|Spurious Emissions||Less than -75 dB ref to carrier|
|Harmonic Emissions||Less than -70 dB ref to carrier|
|Out of Lock RF Muting||Less than -70 dB ref to carrier|
|Residual AM||Less than 0.5 %|
|Synchronous AM||Less than 0.5 %|
|RF Ruggedness||Any VSWR phase or length of time|
|Output Connector||SO239 (or optional N type)|
|Input Connector||BNC 50 ohms|
|Operating Temp||-20 to +40 Deg C|
AC Technical Specification
|Input Voltage||90-264 V AC 135-370 V DC 47-63 Hz|
|Input Power||30W for 12W RF OUT with RF SWR less than 1.5|
|Working Humidity||20-90% RH non-condensing|
|Safety Standards||UL60950-1 TUV EN60950-1 BSMI CNS14336 CCC GB4943 J60950-1 approved|
|EMC Emission||Compliance to EN55022 class B EN61000-3-2 3 FCC PART 15 / CISPR22 class B CNS13438 class B GB9254 GB17625.1|
|EMC Immunity||Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A|