DRAKE DQT1000 사용 설명서 - 페이지 12

{카테고리_이름} DRAKE DQT1000에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. DRAKE DQT1000 15 페이지. Digital to qam transcoder; multiplexing qam modulator

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Operation / Additional Information

OPERATION - MULTIPLEXING TWO ATSC INPUTS

To use the DQT1000 or the MQM1000 to multiplex two

ATSC inputs, proceed as follows:

1) Connect the off-air antenna or CATV feed to the

DEMOD A and DEMOD B inputs of the DQT1000 or

connect the two ASI inputs to the MQM1000. For the

DQT1000 the two input connectors are separate in

case the two RF signals must come from different

antennas or if one signal is coming from a cable

system, etc. If using a common antenna, use a good

quality two way splitter to split the antenna and feed

each input.

2) Plug the power cord from the unit into the power

source.

3) Follow the instructions in the programming section

above to set the channel map and channel number for

both DEMOD A and DEMOD B - DQT1000 only.

4) Set the DEMOD SYMRATE to PRESET for both the A

and B channel - DQT1000 only.

5) Set the MULTIPLEX setting to DEMOD B for the

DQT1000 or to ASI for the MQM1000

6) Set the MUX OFFSET to 10. Read details in pro-

gramming section to determine if you need another

value.

7) Select the desired MPEG programs. (See the

previous section for details.)

8) In the PSIP menu, select BASIC MGT VCT for now,

this may be changed later. See programming section

for detail.

9) In the VCT TABLE menu, select TVCT.

10) In the MAJOR CHANNEL menu, select OUTPUT

CHANNEL. This may be changed later.

11) From the QAM MODE menu, set the QAM modulator

to QAM-256B for use in a DigiCipher II environment. If

DVB, use QAM-256A instead.

12) In the QAM SYMRATE menu, select PRESET.

13) Set the INTERLEAVER to I128,J1 if in a DigiCipher

II environment. There is no interleaver menu when the

QAM mode is set to A (DVB).

14) Set the OUTPUT FORMAT to NORMAL.

15) Set the OUTPUT CHANMAP and OUTPUT CHAN-

NEL to the desired EIA CATV output channel.

If the second program is being input to a DQT1000 via the

ASI input instead of DEMOD B, the same steps apply

except that the MULTIPLEX setting will be ASI and there

will be no parameters to set for DEMOD B.

SET TOP BOX MAPPING

When setting up a program map for your set top boxes to

include off-air channels that are multiplexed by the

DQT1000 or MQM1000 be sure to inform the programmer

that the MPEG program numbers for the programs coming

in through DEMOD B or ASI B have been offset by the

amount selected in the MUX OFFSET menu. As an

example: If input A is providing a channel with MPEG

programs 1 and 2 in the stream and input B is providing a

channel with MPEG programs 1, 2, 3, 4, and 5 in the

stream, and the MUX OFFSET is set to 10, then the new

output signal will contain MPEG programs with program

numbers of 1, 2, 11, 12, 13, 14, and 15. If the set top is not

looking for the right program number, you will not receive

any video!

ADDITIONAL INFORMATION

STANDBY MODE

The DQT1000 and MQM1000 have a standby output mode

which turns off the RF output. This can be used when it is

desirable to temporarily disable the output without

unplugging the AC line cord. Select STANDBY in the

OUTPUT FORMAT menu.

EAS

The DQT1000 and MQM1000 provide an IF input for

Emergency Alert System applications. See R2 in the rear

panel connections descriptions.

OVER TEMPERATURE SENSOR

Temperature monitoring is built into these products. If the

ventilation holes or fan output opening are blocked or the

fan should stop, overheating can occur. If this condition is

detected, the default LCD message will change to OVER

TEMP. If this occurs, the problem should be corrected as

soon as possible. The unit will remain operational but the

ventilation must be restored to prevent premature part

failures due to overheating.

STATUS DISPLAYS

When the units are not in the adjust/program mode, status

displays are shown. These vary by model: DQT1000 -

shows DEMOD A and DEMOD B SNRs. MQM1000 shows

ASI A and ASI B data presence. QQP860 - shows demod

SNR and ERRORS. The ERRORS display is a five digit

number that shows the number of correctable errors that

were processed in a 4.5 second window. A low number is

best.

Pushing the UP arrow button will cause the firmware

version number to display. Pressing the DOWN arrow will

cause QAMSYMRATE to display - the output symbol rate of

the QAM modulator.

REMOTE CONTROL AND MONITORING

The DQT1000 or MQM1000 may be used with the 'Drake

Digital Headend Remote Control Software' program to

allow remote monitoring or control. Only version 2.6 or

newer are compatible with the DQT1000 or MQM1000.

Connect the RS232 cable coming from the PC or modem

to the RS232 IN DB9 rear panel connector.

Assign a UNIT ID (1 to 63) to use the remote program.

Leave at, or set to, 0 if no remote access is desired.

Set the RS232 BAUD RATE to match the PC setting.

If you are familiar with the program, operation will be clear.

If not familiar with it, see further instructions in the insert

provided with the CDROM or stored on the CDROM.

OPTIONS

A second RF demodulator module, PN 1002369, may be

added by the Drake service department to a DQT1000 that

was initially purchased with only one RF input.

A DVB ASI input board, PN 1002368, is available for

installation into a DQT1000.