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The analyzer of digital signals LFM-500D

      The analyzer of digital signals LFM-500D it is intended for adjustment of systems of reception of digital land (radio) TV (DVB-T), a digital cable television (DVB-) and digital satellite TV (DVB-S).
      For signals with analogue modulation allows to measure level of a radio signal of the image in a mode of the selective microvoltmeter and in a mode of the analyzer of a spectrum, to measure power of signals in the chosen strip of frequencies, the relation a signal/noise. Allows to carry out construction of the histogram of levels of the chosen channels.
      With digital forms of modulation the ANALYZER allows to make for signals:
      * measurement of level of power of the digital channel;
      * measurement of the relation of power of the digital channel to noise in the channel (SNR);
      * measurement of frequency of occurrence of erroneous bits to decoder Viterbi (CBER);
      * measurement of frequency of occurrence of erroneous bits after decoder Viterbi (VBER);
      * measurement MER;
      * construction constellation diagrammes
      * measurement of difference PCR successively going packages
      For quality assurance of accepted channels the ANALYZER allows to open and look through channels with modulation digital forms on built in colour TFT the indicator (a sound - on the built in loudspeaker) to deduce audio/video signals on external sockets, and also to use built in TFT the indicator as the monitor, submitting external signals of audio/video.
      Besides, the ANALYZER allows:
      * to keep in non-volatile memory to 50 histograms and spectrograms, with the subsequent transfer on the computer through interface RS-232;
      * to form pressure of a food on an antenna preamplifier (DVB-T and DVB-);
      * to form pressure of food LNB: +13 / + 18 (400), 22 (DVB-S);
      * support of system of commands DiSEqC (the specification of level 2.1);
      The ANALYZER consists of the general base set and options, by which at will of the customer the ANALYZER can be completed. .

LFM-500D.jpg

* Passport and instruction (3,38 Mb, updating 01.09.2010)

The general base set
* the Block of the microprocessor,
* the Power unit with charging device,
* the Accumulator,
* the Information screen
* Video the screen,
* the Case

price: 650
nominal dollars
Built in options Price
* the Measuring instrument of level of signals of TV of a range 330 c.u.
* the Analyzer of a spectrum satellite (950-2150 MHz) and MMDS (2380-2700 MHz) ranges 255 c.u.
* Analyzer DVB-T 150 c.u.
* Analyzer DVB- 150 c.u.
* Analyzer DVB-S 150 c.u.
The general technical characteristics
Input / Output sockets N(m), 50 Ohm
VSWR, no more than 1,6
Voltage supply 200...250 V
Mains power consumption ≤ 20
Time of continuous running from a built-in accumulator not less than 2 h
Accumulator charge time not more than 12 h
Time of an establishment of operating conditions 5 min
Average life duration not less than 10 000 h
Average service life, not less 5 years
Indicator b/w LCD, 10cm (3,7")
320 (H) x 240 (V)
Display TV (for video signal viewing) color 4" TFT,
480 (H) x 234 (V)
Dimensions 100240250 mm
Weight 3 kg
The analyzer of a spectrum of TV of a range
(installed with option "Analyzer DVB-C, T")
TV microvoltmeter The analyzer of a spectrum of TV
Range of working frequencies 5-862 MHz
Pass-band (on level a -3 dB) 200 kHz ± 20kHz
Review band -- 16 MHz
Reorganisation step on frequency 62.5 kHz 8 MHz
Error of measurement of frequency of a signal, no more ± 62,5 kHz ± 0,8 MHz
Range of measurement of level of a signal 25-120 dB/mkV 25-127 dB/mkV
The permission on measured level 1 dB
Input attenuator 0, 20, 40 dB (Automatically) 0...40 dB (with step 4 dB)
Dynamic range -- 55 dB
Error of measurement of level of a signal, no more ± 2dB ± 3dB
The analyzer of a spectrum of a satellite range
(installed with option "Analyzer DVB-S")
SAT SAT LINZA
Range of working frequencies 950-2150 MHz
Pass-band (on level a -3 dB) 10 MHz 0,5 MHz
Swath 1200 MHz 1...80 MHz (step 1 MHz)
Reorganisation step on frequency 3,75 MHz 0,25 MHz
Error of measurement of frequency of a signal, no more ± 5 MHz ± 0,25 MHz
Range of measurement of level of a signal 20-100 dB/mkV 10-105 dB/mkV
The permission on measured level 1 dB
Input attenuator 0...40 dB (with step 4 dB)
Dynamic range 40 dB 55 dB
Error of measurement of level of a signal, no more ± 4 dB ± 3 dB
Giving power supply on an entrance socket +13, +18V (400mA), 22kHz
The analyzer of spectrum MMDS range
(installed with option "Analyzer DVB-S")
MMDS MMDS LINZA
Range of working frequencies 2380-2700 MHz
Pass-band (on level a -3 dB) 0,5 MHz 0,5 MHz / 10 MHz
Review strip 80 MHz 1...80 MHz / 10...320 MHz (step 1 MHz)
Reorganisation step on frequency 0,25 MHz 0,25 MHz / 3,75 MHz
Error of measurement of frequency of a signal, no more ± 0,25 MHz ± 0,25 MHz / ± 5 MHz
Range of measurement of level of a signal 10-105 dB/mkV 20-100 dB/mkV
The permission on measured level 1 dB
Input attenuator 0...40 dB (with step 4 dB)
Dynamic range 55 dB 55 dB / 40 dB
Error of measurement of level of a signal, no more ± 3 dB ± 4 dB
Parametres of digital forms of modulation1 DVB-T DVB-C DVB-S
Modulation type QPSK, QAM16, QAM64 QAM16, QAM32, QAM64, QAM128, QAM256 QPSK
Range of measurement of the relation a signal/noise (SNR) 10...24 dB 20...38 dB 10...38 dB
Range of measurement BER to decoder Viterbi 1*10-2...1*10-8 1*10-2...1*10-8 1*10-2...1*10-8
Range of measurement BER after decoder Viterbi 1*10-3...1*10-8 -- 1*10-3...1*10-8
Relative speed of coding 1/2, 2/3, 3/4, 5/6, 7/8 -- 1/2, 2/3, 3/4, 5/6, 7/8
Automatic frequency trim ± 0,5 MHz ± 0,5 MHz --
Quantity of frequencies of the channel 2k, 4k, 8k -- --
Hierarchical modulation None, α=1, α=2, α=4, -- --
Protective interval 1/4, 1/8, 1/16, 1/32 -- --
Measurement MER 20...38 dB 20...38 db 20...38 dB
Construction constellation diagrammes ok ok ok
Error in a signal transmission of synchronisation of the setting generator (PCR error)2 The maximum period of data transmission PCR on the chosen channel of video is displayed
Error of inadmissible leaving of frequency of a signal of synchronisation (PCR accuracy error)3 The maximum difference between internal and external hours is displayed

The note: Channel S37 is excluded from the general frequency plan of TV of channels
1) the device measures Digital parametres of signals only in certain ranges. For DVB-T a format - a television range (174-226 MHz) and a decimeter range (474-858). For DVB- a format - a standard range for a cable teleimage (49 MHz - 860 MHz).

2) Data PCR (on the chosen channel of video) should be transferred with the period no more 40.

3) comparison of difference PCR successively going packages of the chosen channel of video (external hours), with the condition of the internal timer defining time between these two packages (internal hours) Is spent. The difference between internal and external hours should not exceed 500.