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MODULE REPLACEMENT

1.

Disconnect the 3 pin molex connector from module.

2.

Disconnect the audio, video, and RF connectors from back of module.

3.

Remove module by sliding the unit out the front of the chassis.

4.

Insert replacement module into chassis.

5.

Reconnect the 3 pin molex connector and audio, video, and RF connec-
tors to the rear of module.

6.

Set Channel Frequency, level and deviation controls as described in
installation procedures.

OPERATION AND CARE

Do’s & Don’ts

Always operate in a cool well-ventilated environment.

Always provide a stable, conditioned power source..

Heed all safety warnings and obey all environmental and electrical oper-
ating requirements.

To clean, use a damp cloth only and clean only with mild soap.

Do not use solvents or harsh detergents.

Do not use this product for purposes other than intended.

HEADEND/DISTRIBUTION INTERFACE

We r

ecommend connecting the headend components in 

the following manner:

Each of the modulators, signal processors or strip amplifiers output are 
connected to a combining network. Either a  head-
end combiner may be used to accomplish this purpose.

The passive headend combiner consists of two rows
of directional couplers combined by a hybrid splitter. Normally, the odd chan-
nels are combined on one row while even channels are combined on the
other row of directional couplers for maximum isolation. The output of the

combiners may be connected to the 
input of a launch amplifier

The output of the

amplifier is connected to the main 
distribution line.

A 24 channel system hook-up is shown. (The
same combining result may be accomplished
by using a single 

#____

). The two 

#____

o

utputs are combined via a two-way split-

ter, which is connected to a 
launch amplifier. The input levels to the com-
biner, whether from a modulator, signal
processor or a strip amplifier, must be at the
same amplitude.

Installation Procedure

Use a small plastic screwdriver to make required selection of switches 
and buttons

1.

If module is to be used in an HRC or IRC CATV frequency assignment,
slide the format assignment switch inside the side of module to HRC or
IRC. (Unit is shipped with this switch in the STD position) 

2.

If the audio source is BTSC stereo, slide the preemphasis switch inside the
side of module to off. (Unit is shipped with this switch in the on position)

3.

Align the top and bottom edge of module with the guide channel in chassis.

4.

Slide module into chassis.

5.

Connect the 3 pin molex power supply connector.

6.

Connect a cable between the module RF output connection and the
channel-combining network.

7.

Connect cables from the programming source baseband output to the
audio and video input connectors of module.

8.

If needed, press the CATV/ANT button to select between cable TV and off-
air channel assignments.

9.

Select the desired channel by pressing either channel button adjacent to
the arrows on front panel.

10.

When the desired channel is displayed, press the set button to lock channel.

11.

Connect a signal level meter or spectrum analyzer to a common port of
the channel combiner network.

12.

Adjust RF output control on the front of modulator until the RF video
carrier level matches the RF video level of adjacent channels.

13.

Adjust the A/V ratio control on the front panel until the RF audio carrier
level is between 13 and 17dB below the RF video carrier level.

14.

Connect a television set to a common port of the channel combiner network.

15.

Analyze the brightness of channel compared to adjacent channels.

16.

If needed, adjust video control on the front of modulator until the bright-
ness level matches the brightness of adjacent channels.

17.

Analyze the sound level of channel compared to adjacent channels.

18.

If needed, adjust audio control on the front of modulator until the sound
level matches the sound of adjacent channels.

PCMA860-HQ

Содержание PCMA860-HQ

Страница 1: ...Installation and Operation Manual PCMA860 HQ Universal Chassis Agile A V Mini Modulator DAWNco 3340 S Lapeer Rd Orion MI 48359 1320 Ph 248 391 9200 Fax 248 391 9207 sales DAWNco com...

Страница 2: ...l and the like 8 Accessories Do not place this product on an unstable cart stand tripod bracket or table The product may fall causing serious injury to a child or adult and serious damage to the appli...

Страница 3: ...d If the product does not operate normally by following the oper ating instruction Adjust only those controls that are covered by the operating instructions An improper adjustment may result in damage...

Страница 4: ...or adjacent channel selectivity The unit s PLL circuitry in conjunction with the non volatile memory contained in the microprocessor ensures easy and reliable channel selection and restoration The mod...

Страница 5: ...F Frequency Video 45 75 MHz Audio 41 25 MHz RF Video Input Level 1 V p p minimum for 87 5 modulation Video Input Type Clamped video negative sync Video Frequency Response 0 8 dB 30 Hz to 4 2 MHz Diffe...

Страница 6: ...o higher number 7 Channel Select Push this button to change channel to lower number 8 Channel Lock Control Switch is used to prevent accidental change of channel 9 Channel Display Indicates selected c...

Страница 7: ...amplifier must be at the same amplitude Installation Procedure Use a small plastic screwdriver to make required selection of switches and buttons 1 If module is to be used in an HRC or IRC CATV frequ...

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