TS9000 FM Broadcast Analyser

Transcription

1 TS9000 FM Broadcast Analyser Technical Specification Issue C 17th Sept

2 TS9000 FM Broadcast Analyser The TS9000 is a high performance FM receiver and Modulation Analyser providing broadcast accuracy measurements. It runs from and is powered by a USB port, allowing on-site or mobile monitoring. The unit samples the Multiplex signal at 240kHz at 12bits precision. This data is passed via the USB cable to the PC, where all measurements and calculations are performed in Windows software. Modulation Power is calculated with 32bit floating-point precision. The band covered is 87.5 to 107.9MHz in 10kHz steps, with an attenuator of -10/20/30dB for high signal strength areas. FFT Spectrum Analyser: The unit includes a precision base-band FFT Spectrum Analyser covering 10Hz to 100kHz with a range >90dB and a resolution of 20Hz. This can be used to inspect the Multiplex signal or as a stand-alone audio analyser using the external BNC input. Various sample windows can be applied i.e. Hanning, Hamming, Blackman-Harris etc, providing a versatile measurement instrument. Measurements: Deviation: +100kHz to -100kHz with oscilloscope and PPM displays Modulation Power: -8dBr to +12dBr (0dBr ref 19kHz) Pilot 19KHZ: db or % RDS carrier 57KHz: db or % Signal Strength: 85dBu range Multipath: 3dBu range Multiplex signal accuracy: A new LC IF equalization circuit ensures a flat frequency response. A 5 pole Butterworth filter provides out of band suppression. Bandwidth: 20Hz to 80kHz < -0.4dB 100kHz < -1.5dB Deviation accuracy: 0 to 75kHz < +/-1.5% (1kHz test sinusoid) RDS decoding: Decodes PI,PTY,PS,RT,CT,PIN,AF,TA,TP,DI,MS and EON. Audio: High quality stereo audio monitoring is provided with balanced outputs. Line output: -59dBm to +4dBm via XLR Loudspeaker: 0.4 watts/channel Headphone: 0dBm on 3.5mm jack

3 FFT Spectrum Analyser (Frequency domain): The Multiplex spectrum shown below covers 0.1Hz to 70kHz. The cursor is centred on the RDS 57kHz sub-carrier. This can be measured to a resolution of 100Hz and 0.1dB. With the resolution increased more detail can be displayed at the frequency of interest and the resolution is just 20Hz. Here the sub-carrier centre frequency can be accurately measured and its modulation amplitude. In this case 46.5dB below 75kHz. Data Logging Comprehensive manual data logging or the Autolog function can be selected. The TS9000 can then be left in a stand-alone data logging mode, with audible alarms available for out-ofspecification signals.

4 Oscilloscope (Time domain): The Multiplex signal can be viewed in the time domain with an oscilloscope type display. The timebase can be set from 10ms/div to 10us/div. The Y-axis has a x10 function. The trigger point can be user set or in automatic mode. The picture below shows typical trace with positive and negative deviation bar graphs. These can be arithmetically rectified to give absolute readings. Deviation shown from 100KHz to +100KHz Or absolute Deviation shown from 0 to +100KHz This trace shows just pilot from a low modulating broadcast. Note timebase of 100us/div

5 Main screen: This screen shown details all of the most useful broadcast data. All functions are accessed from here. The actual size is 1024*768 pixels. Tuning screen: The broadcast frequency spectrum is shown here. This was obtained from the AutoLog function, which will search and display for stations above a user set threshold. Their PS name will automatically be appended to the graph

6 Deviation histogram window: A deviation histogram can be viewed in real time, from this window. The following variables are calculated from the collected data. T Lapse time measured in minutes and seconds N The number of samples taken M The mean value of deviation D The quadratic mean value of deviation S The mean of samples above 75KHz % The percentage of samples above 75KHz K Equals S*% Multipath: A Multipath menu is provided to set the peak filer time constant. The digital readout is the mean value taken from the peak filter. Alternatively, multipath can be displayed in XY format as shown above.

7 Modulation power window: Modulation power is initially averaged over a 60 second period. This is indicated by the steppedlevels in the graph. A longer term, average modulation power, is shown by the digital readout. To assess a station s true modulation power level, this test would be run for at least 15 minutes. Maximum and minimum power levels are shown each minute. The 0dBr reference is equivalent to a frequency deviation level of 19KHz, with a modulating sine wave of 1KHz. The menu copy button, will copy screen to the clipboard ready for pasting in other documents

8 RDS data Undecoded continuous RDS data is displayed in this window. Group repetition rates are calculated over a sixty second period. RDS quality is given to four decimal places. EON data A continuous update of EON data is available for all networks received. When all data has been captured, it can be stepped through for inspection, or printed out for hard copy.

9 RT history Up to 16 previous RT messages are displayed in the RT window. These messages can be logged directly to hard disk. The number of messages can be set and they will be stored in ASCII text. These can be cut and pasted into any text file. Repeat messages can be ignored. AF data Both method A and method B AF data modes are supported. For method B AF frequencies will automatically scroll across the graph as they arrive, so a continuous display of data is visible.

10 Technical specifications: System parameters Min Typical Max Units Bandwidth MHz Input impedance 50 ohms Noise figure 5.5 db AM suppression 56 db RF bandwidth 1.7 MHz IF bandwidth narrow 230 khz IF bandwidth wide 280 khz Sensitivity 3.5 uv RSSI range db Antenna attenuator +/-1.0 +/-2.5 db Multipath range 4.0 db Pilot 19KHz range khz RDS 57kHz range khz THD % Stereo cross-talk db Balanced line 1.0 v RMS LS classb 8 ohms 0.5 watt Digital vol/level 6 bits USB power Min Typical Max Units Supply voltage volts Standby 100 ua Quiescent 250 ma Maximum 500 ma System accuracy Min Typical Max Units Multiplex bandwidth db 20Hz to 100kHz End bandwidth -65 Deviation accuracy +/- 1.5 % 1kHz sinusoid Multiplex sampling khz Multiplex depth 12 bits RSSI accuracy +/- 1 +/- 2 db Antenna attenuator: Software switched -10dB, -20dB and -30dB Automatic Band switching: Wideband 280KHz for multiplex measurements Narrowband 230KHz for signal strength scanning

11 Signal connectors: BNC Antenna input 50ohms BNC IF input at 10.7MHz BNC Analyser input 47K 0dBm (Multiplex in or Spectrum analyser) BNC Multiplex output 50ohms 0dBm at 75KHz XLR Audio left and right, balanced. Line or loudspeaker. Jack Headphone or sound card USB 1.1 System requirements: TS9000 software runs under Windows98/2, Me, 2000 and XP. Minimum usable system: Windows98/2 running on a 300MHz Pentium/Athlon Recommended system: Windows2000/XP 800MHz Pentium/Athlon A fast graphics card is also recommended as this provides for a fast update of the Spectrum Analyser and Oscilloscope traces. Dimensions: 225mm * 200mm * 72mm Weight: 0.9 Kgm TS9000 package: TS9000 unit USB cable CD software Installation instructions