DRAKE EH24 Manuel d'instruction - Page 10

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Setup and Programming (continued)

This section provides additional details regarding the selectable

items shown in the 'program' mode on the Software Flow Chart on

page 9.

SETUP: EH24

UNIT ID: Select the desired unit identification number when

connecting the 'RS232 IN' connector to a PC or modem for remote

control using 'Drake Remote Control Software'. Numbers 1 thru

63 may be used. If zero (0) is selected, the PC will ignore the unit.

RS232 BAUD RATE: This setting determines the baud rate at

which the EH24 communicates with the remote PC. Settings

available are 2400, 4800, 9600 and 19,200. All units 'daisy

chained' to the remote PC or modem must be set to the same

baud rate.

ENCODER 1 THRU 12: These menu items provide the means for

selecting the desired output mode of operation for each of the

installed encoders. The available settings are DISABLED, QAM +

ASI, ASI, and QAM.

QAM MGT/VCT: This menu item provides a means for the user to

select either CVCT or TVCT tables or DISABLED for QAM

operation. TVCT is the typical setting.

QAM MAJOR CHANNEL: The user may use this menu entry to

define the QAM major channel number. The choices are OUTPUT

CHANNEL or USER DEFINED using an external PC with Drake

Digital Headend Remote Control Software.

ASI MGT/VCT: This menu item provides a means for the user to

select either CVCT or TVCT tables or DISABLED for ASI opera-

tion.

ASI MAJOR CHANNEL: The user may use this menu entry to

define the ASI major channel number. The choices are OUTPUT

CHANNEL or USER DEFINED using an external PC with Drake

Digital Headend Remote Control Software.

QAM MODE: This menu allows the user to set the modulation

type for the output. Choices range from QAM-16A through QAM-

1024B. 'A' suffixes indicate DVB compliant FEC and the B

suffixes indicate DigiCipher II FEC encoding. Note that the output

QAM mode usually must be QAM-256. For CATV systems using

DigiCipher II, select the QAM-256B mode. For DISH Network

QAM distribution or other DVB systems using DVB set tops,

choose the QAM-256A mode.

GRAY ENCODING: This menu is only available when QAM

modes QAM-16A through QAM-1024A, are selected. The choices

are DVB and DAVIC. Gray Encoding is normally not used for video

data.

QAM SYMRATE: Preset or Manual: If PRESET is selected, the

symbol rate will be automatically set to the 'normal' rate based on

the QAM mode that is selected and assuming a 6 MHz wide QAM

channel. If MANUAL is selected, pressing the right or left arrow

buttons will allow selection of symrates from 1.000 thru 7.000

MSym/Sec.

QAM SYMRATE: This menu item only appears of 'Manual' is

selected in the previously described menu item. It allows selection

of the output QAM baudrate or symbol rate. Set as required by the

set top box.

INTERLEAVER: This menu item only appears if QAM-64B, QAM-

256B, or QAM-1024B is selected and provides the means to set

the QAM modulator interleaver. Choose among the available

selections based upon your system / set top box requirements. For

typical 256-QAM DigiCipher II CATV systems, I128, J1 is the most

commonly used interleave setting but many other choices are

available. This menu does not appear in the adjust mode if the

QAM mode is A (DVB) as there is only one choice in the DVB

standard.

OUTPUT FORMAT: For normal operation, select NORMAL. For

system level set up, choose CW to provide a CW carrier at the

center frequency of the output channel for use in leveling a system

when a QAM power meter is not available. To disable all RF

output, select STANDBY. In the CW mode, the CW carrier can be

measured on a spectrum analyzer without a need to apply a

bandwidth correction or it can be measured with an analog meter

tuned to channel center. The CW power measured will equal the

channel QAM power when the modulator is returned to NORMAL

output mode. Usually QAM signals are set 5 dB to 10 dB below

analog NTSC channels when balancing a system.

PRBS menu entries are used for testing purposes only and should

normally not be selected by the user.

OUTPUT CHANMAP, OUTPUT CHANNEL: Select the desired

EIA CATV channel output using these two menus.

RF LEVEL: Select the desired RF output signal level. The

available range is between +45 dBmV and +56 dBmV, selectable

in 0.5 dB steps. The output accuracy is ± 1 dB.

SETUP: ENCODER xx

ENCODER SELECT: The LEFT and RIGHT buttons allow the

user to scroll through the encoder numbers for each encoder

installed in the EH24 as well as the EH24 itself. Use the LEFT and

RIGHT buttons to select the encoder to be programmed.

VIDEO: This menu entry allows the user to select between S-

VIDEO and COMPOSITE video input for each selected encoder.

FORMAT: Either MPEG2 or MPEG4 H.264 may be selected as

the output format for the selected encoder using this menu item.

Encoder 2 on a given SDE24 has no option. It is forced to

MPEG2.

RESOLUTION: The resolution of the video output of each

encoder may be selected from this menu item. The choices range

from 720 x 480 thru 353 x 240 as shown on the software flow chart

on page 9.

BRIGHTNESS, CONTRAST, SATURATION and HUE: These

menu items allow the user to assign each of these parameters of

the output video values from 0 to 255.

MAX AUDIO IN: This menu entry allows the user to set the

maximum audio input which may be input to the selected encoder.

The choices are 1 Vrms or 2 V rms.

AUDIO GAIN: The audio output level can be chosen from this

menu item by selection of the appropriate gain. The values range

from + 15 dB to - 15 dB. Audio output can also be completely

eliminated using the 'MUTE' selection.

AUDIO ENCODER: The SDE24 includes audio encoders for

Dolby Digital Stereo commercial encoding (AC3) or MPEG1 Layer

2 audio encoding (MP2). In the USA, the majority of applications

will use AC3 but if your network is using Annex A (DVB) set top

boxes, they may require the MPEG audio selection. Some TVs

and set top boxes will decode either mode but be sure to set the

encoder to the mode used by other programming on your system

to insure complete compatibility. The AUDIO ENCODE(R) menu

allows you to select either AC3 or MP2. Use the up/dn arrow keys

to toggle between the two settings.