DRAKE DAD860 Manuel d'instruction - Page 10

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DAD860 Setup and Programming (cont.)

ADDITIONAL MENU ITEMS

RF # - MPEG # - This menu screen allows selec-

tion of the desired channel and MPEG program

from the list saved in memory or by one of the

methods in the secondary menus described previ-

ously.

TV TYPE - Since the purpose of the DAD860 is

usually to provide 480i, 4:3 aspect ratio video for

display as a 480i signal, choose the 4:3 setting.

MODE - This selection determines how the video will

be displayed on the TV screen. One of the AFD

modes is recommended.

CROP" use data that may be transmitted by the

broadcaster via the AFD (Active Format Description)

codes to automatically switch the DAD860's output

between cropped or letterbox display to provide the

optimum viewing experience on a 4:3 TV. If no codes

are being transmitted, the aspect ratio will default to

"LTR BOX" or "CROPPED" respectively.

desirable to ignore AFD codes and force a particular

mode, that may be done by selecting one of the

following settings.When wide screen video is being

received, "CROPPED" truncates the left and right

sides of the picture and expands it vertically to fill the

4:3 sized screen. "LTR BOX" will show the entire

picture without distortion, but will leave black bars

above and below the picture. "STRETCH" expands

the picture vertically without cropping the left and right

sides. The "STRETCH" mode is only used for

special circumstances.

VOLUME - This menu determines the audio output

level of the left and right audio outputs. The selec-

tions are from 0 to 100. Adjust for maximum audio

level without distortion. 85 is the default value.

AUDIO - Determines the language of the output

audio when multiple languages are available. The

choices are "1. ENG" (English), "2. SPA" (Spanish)

and "3. FRE" (French).

WEAK SIG - This is used to select the video output that

is to be displayed if the signal on the selected channel

is either absent or too weak for successful decoding.

The choices are "NO MUTE", and "MUTE". If "NO

MUTE" is selected, pressing the RIGHT button will

take the user directly to the VERSION NUMBER

screen. However if "MUTE" is selected, the MUTE

SCR screen appears with the choices of "BLUE SCR"

(blue screen) and "NO VID" (no video). Use the up or

down buttons to make the desired selection and press

the right button to proceed to the Version Number

screen. Muting, if selected, will occur if the SNR

drops below 15 dB, and the unit will unmute when the

SNR then reaches 17 dB or higher. With no muting

selected, much more pixelization can be seen at

around 15 dB SNR and the screen will go to blue

screen at around 12 dB SNR.

"AFD/LTR" and "AFD/

If it is

UNIT # - SN - This is the default screen when a

DAD860 is selected. It displays the unit number of

the selected DAD860 as well as the signal to noise

ratio (SN) of the signal being received. If no signal

is being received. "NO LOCK" will be displayed

instead of a signal to noise ratio.

CH PLAN - This menu allows the selection of the

type of channel plan that will be received. The

choices are "OFF AIR", "CATV STD", "CATV HRC"

and "CATV IRC". Tables showing channel number

vs frequency of CATV STD and OFF AIR (broadcast

TV) channel plans are shown on pages 11 and 12

respectively.

PROGRAMMING WITH A PC

In addition to being programmed with the 'DAD860

Controller', the DAD860 can be programmed with a

PC running 'DAD860 Remote Control Software'.

Connection to the PC is accomplished using a

standard RS232 serial cable connected from a

serial port on the PC to the RS232 serial port in the

front panel of the DAD860.

Details of the programming procedure are included

in the documentation supplied with the software.

Once programming is complete, the RS232 cable

may be removed from the DAD860. It is not neces-

sary to leave the PC connected after programming

is complete.

MEMORY RETENTION

Regardless of whether a DAD860 is programmed

using the 'DAD860 Controller' or a PC running

'DAD860 Remote Control Software', a DAD860 will

retain the programming even if power is removed

for prolonged periods.

POWER SUPPLY

The DAD860 requires multiple power supply volt-

ages that are all obtained from the Drake model

PSM121 power supply module. The PSM121

mounts in the RMM12 rack tray along with one to

twelve DAD860 decoders (or other similar Drake

models such as VMM600 series modulators). The

PSM121 provides +5V, +12V and GND connections

to each unit.

The PSM121 operates over a wide range of AC

input voltages from 90 VAC to 240 VAC, 50/60 Hz,

and has an 3 wire line cord receptacle. Power

consumption from the AC line will be around 60 W

with twelve DAD860 decoders installed. In many

cases, the power will be below this level.

VERSION NUMBER - The firmware version number of

the selected DAD860 is displayed on this screen.