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GSS HDM 500 C, Assembly Instructions Manual

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GSS HDM 500 C Assembly Instructions Manual Download Page 19

- 19 -

- 19 -

LED indicator

Indication

Green

Signal quality is good

Yellow

Signal quality is poor

Red

No signal

Off

The channel strip (modulator) 

is switched off

• Press the 

 button to return to the main menu.

• Press the 

 button.

—>  The “Setting the QAM modulation” –  “

QAM

” menu 

is activated.

Setting the QAM modulation

 

In this menu, you can set the QAM modulation and invert the 
user signal. For the setting of 256 QAM the output level is in-
creased automatically.

• Use 

  to set the QAM modulation (“

4-QAM

” … 

“

256-QAM

”).

—>  For higher QAM modulation, the output symbol rate 

is lowered. 

 

An output QAM modulation of > 64 QAM places 
a large burden on the cable network. Due to noise, 
delay and frequency response problems, reception 
of the converted output signal can be impeded.

Status LED 
Channel strip "A"

Status LED 
Channel strip "B"

Bx 4A

 64-QAM

QAM

normal

▶

 

◀

/

4 … 256

normal / inverse

Summary of Contents for HDM 500 C

Page 1: ...3 D 90471 Nuremberg Phone 49 0 911 703 8877 Fax 49 0 911 703 9210 E mail info gss tv Internet http www gss tv Assembly Instructions Assembly Instructions English HDM 500 C Head End Digital Modulator A A CLASS CLASS KLASSE KLASSE Grundig SAT SystEms ...

Page 2: ...mming procedure 10 5 4 Programming the cassette 12 Selecting the cassette 12 Selecting the channel strip 13 Selecting channel frequency setting 13 Setting the output channel 14 Setting the output frequency 15 Switching the modulator off or on 15 Adjusting the output levels of the channel strips 15 Setting the LNB oscillator frequency 16 Setting the input symbol rate 17 Setting the input frequency ...

Page 3: ...an ambient temperature of 20 C to 50 C Ensure that the head end station is adequately ventilated Do not cover the ventilation slots Beware of short circuits No liability is accepted for any damage caused by faulty connections or inap propriate handling Observe the relevant standards regulations and guidelines on the installation and operation of antenna systems Earth the SAT receiver in accordance...

Page 4: ...s for CE labelling HF input Frequency range 950 2150 MHz Level range 60 dBµV 80 dBµV Input norm QPSK Symbol rate 1 45 Msymb s SCPC MCPC HF output Channels S21 C69 Frequency range 42 0 MHz 860 0 MHz Output level typ 97 dBµV Output impedance 75 Ω Connections SAT inputs 2 F sockets HF output 1 IEC socket Connection strip 10 pin for supply voltages and control circuits RS 232 socket serial interface f...

Page 5: ...lly the quality of the data stream received is displayed CN The output symbol rate is fixed to a value of 6900 kSymb s If the symbol rate being transmitted exceeds this value change to a high order modulation e g from 64 QAM to 256 QAM When the head end station is switched on the two line LC display shows the software version of the control unit To operate this cassette the software version of the...

Page 6: ...tions of the board and the HF bus bar Fasten the cassette with the 1 screws 3 2 EMC regulations To comply with the current EMC regulations it is necessary to connect the lines leading in and out of the head end station using F terminals The attenuation of shielding of the connection lines must meet the require ments for Class A When mounting the cassette in a STR 19 8 head end station which is in ...

Page 7: ...on is made between the housing and F terminal 3 3 Connecting the cassette Plug the SAT input cables into the SAT input sockets SAT input A 2 channel strip A and SAT input B 1 channel strip B Connect the head end station to the mains power supply 3 RS 232 socket The operating software of the cassette can be updated via the 9 Pin D SUB socket RS 232 using a PC or notebook and the software BE Flash Y...

Page 8: ... strip Channel Frequency selection Output channel output frequency Level setting LNB oscillator frequency Input symbol rate Input frequency QAM modulation Stuffing Substitute signal 4 2 Functions of the control panel buttons The key pad on the head end station is used to scroll through the menus and menu items one at a time scrolls forward through the menus select parameters in the menus set value...

Page 9: ...nnel strips A and B if the difference in level is 1 dB page 15 5 2 Notes on level setting In order to prevent interference within the head end station and the cable sys tem the output level of the QPSK QAM module must be lowered by 10 dB compared to analogue modulators at 64 QAM and by 4 dB compared to analogue modulators at 256 QAM Measure the output levels of the other cassettes and tune them to...

Page 10: ...ox 4 V 1 QPSK C Bx 1A C5 12 S3 24 TWIN SAT C07 Bx 1A C5 12 S3 24 TWIN SAT C07 Böx 4 C5 12 S3 24 TWIN SAT C07 Bx 5A BD3 DVBT DVBT C09 Bx 4A V 1 QPSK C S41 Bx 4A Channel OUTPUT A B t 10 s Channel Freq Bx 4A S41 OUTPUT on on off Bx 4A 0 dB LEVEL Bx 4A 10600 MHz LNB 0 10 dB ...

Page 11: ... S M Bx 4A 11836 1 8 FREQ CN 12 Bx 4A SR 6900 6325 STUFFING Bx 4A Null Packets FAILURE Bx 4A 64 QAM QAM normal 4 256 normal inverse Null Packets Single Carrier Bx 4A 12 0 dB C N 9 6 OK Anzeige Signalqualität Display Signal quality ...

Page 12: ...o the Selecting the cassette menu item Switch on the head end station The display shows the software version e g V 37 The processor reads the cassettes data approx 10 seconds _ Selecting the cassette Select the cassette you want to program e g Box 4 by repeatedly pressing the button if necessary By pressing the button activate channel strip A Ein On BE Remote please wait V 37 t 10 s Box 4 V 1 QPSK...

Page 13: ...s the range of channels S21 C69 the frequency setting covers the range from 42 0 MHz to 860 0 MHz The QAM signal is normally transmitted with a bandwidth of 8 MHz This means that you can only use the channel centre frequency of the existing channel raster in the range of chan nels S21 C69 frequency raster 8 MHz The CCIR chan nel raster is 7 MHz in the range of the lower frequency bands channels C2...

Page 14: ...etting the output channel or Setting the out put frequency OUTPUT menu is activated If frequency setting is selected continue on page 15 with Setting the output frequency Setting the output channel In this menu you set the output channel S21 C69 of the channel strip Additionally the modulator of the channel strip can be switched off or on page 15 Use the buttons to set the output channel Bx 4A Cha...

Page 15: ...o switch off the modulator move the cursor under on us ing the button and then use the buttons to switch off off the modulator The switched off modulator is indicated by in the display If the modulator is switched off use the buttons to switch it on on Press the button The Adjusting the output levels of the channel strips Level menu is activated Adjusting the output levels of the channel strips In...

Page 16: ...f one channel strip to the lower output level of the other channel strip incrementally from 0 to 10 dB Press the button The Setting the LNB oscillator frequency LNB menu is activated Setting the LNB oscillator frequency Set the oscillator frequency of the LNB used in this menu Use to position the cursor under the digit to be set for the frequency display Press to enter the oscillator frequency of ...

Page 17: ... the input frequency If three dots appear in the second line of the display the cassette is in the station search mode Please wait until the process has finished Once the HF receiver has synchronised to the input signal any offset to the target frequency is displayed in MHz e g 1 8 If a question mark appears in the second line of the dis play there is no input signal present Check the configuratio...

Page 18: ... 9 6 OK 1 Current signal to noise ratio 2 This value shows the difference between the quality of the input signal and the threshold of the tuner at this type of modulation At a value lower than 5 picture dropouts can oc cur 3 If OK is shown the signal to noise ratio is ok If a value 5 is shown under 2 the display changes from OK to In this case test the input signal In addition to the indicator in...

Page 19: ...can set the QAM modulation and invert the user signal For the setting of 256 QAM the output level is in creased automatically Use to set the QAM modulation 4 QAM 256 QAM For higher QAM modulation the output symbol rate is lowered An output QAM modulation of 64 QAM places a large burden on the cable network Due to noise delay and frequency response problems reception of the converted output signal ...

Page 20: ...f 6900 kSymb s If the symbol rate being transmitted exceeds this value change to a high order modulation e g from 64 QAM to 256 QAM SR 6900 number 1 Output symbol rate Bx 4A SR 6900 6325 STUFFING Number 1 Number 2 6325 number 2 Current measured output symbol rate The value will fluctuate as the data rates for indi vidual stations are dynamically altered by the broad casters The value of number 2 m...

Page 21: ... input signal You use this menu to set whether a Null Packets QAM sig nal or a Single Carrier signal should be provided as an output signal whenever an incorrect input signal occurs Use the buttons to set the output signal required Saving settings Press the M button Going back to Selecting the cassette A page 12 The settings are saved By pressing the button you will be returned to the menu item Se...

Page 22: ... Channel centre frequency MHz S 21 303 25 306 00 S 22 311 25 314 00 S 23 319 25 322 00 S 24 327 25 330 00 S 25 335 25 338 00 S 26 343 25 346 00 Kanal Channel Bildträgerfrequenz Picture carrier frequency MHz Kanalmittenfrequenz Channel centre frequency MHz S 27 351 25 354 00 S 28 359 25 362 00 S 29 367 25 370 00 S 30 375 25 378 00 S 31 383 25 386 00 S 32 391 25 394 00 Kanal Channel Bildträgerfreque...

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