DRAKE HCP2550A Manual de Instruções descarregar pdf (Página 6)

HCP2550A CHANNEL PROCESSOR

7 8

4 4

INPUT

CHANNEL

PILOT

THRESHOLD

A/V

RATIO

SIGNAL

LOCK

DETECT

OUTPUT

LEVEL

OUTPUT

CHANNEL

POWER

OUTPUT

ENABLED

EAS

READY

PRE-AMP AFC

OFF ONOFF ON

CATV

OFF

AIR

IRC

HRC

STD

CATV 100

CHANNEL PLAN

RF INPUT

RF OUTPUT

2 Front Panel Controls and Indicators

Figure 1

F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12

F1 – POWER Indicator

Lights when the unit is connected to a source of

AC power.

F2 – Preamp Switch

Switch to the ‘ON’ position to provide approximately 10 dB

of low noise amplification to the input signal.

F3 – AFC Switch

Switch to the ‘ON’ position to provide automatic frequency

control tuning of the input signal. The input signal must

be within ±75 kHz of an assigned off-air or CATV channel

for AFC capture. This feature, when activated, causes the

composite IF output signal to have its visual carrier locked

at 45.75 MHz. This AFC action ensures that the RF

output signal of the HCP2550A will automatically remain

at the assigned frequency of operation for a given channel

with any required FCC offset. It is recommended that

the AFC be switched on for all input and output

channel combinations, except when the output

channel is set for the same channel as the input. The

‘LOCK DETECT’ LED (see Item F6) will light to indicate

that both input signal synthesizers are locked and the

AFC function is active.

F4 – CHANNEL PLAN Switches

Sets the type of channel, Off-Air or various CATV channel

plans.

- Setting the left-hand switch for “OFF AIR” electronically

locks out the right-hand switch.

OFF-AIR CHANNEL 25:

CATV

OFF AIR

IRC

HRC

STD

INPUT

CHANNEL

100

RF INPUT

2 5

CHANNEL PLAN

- Setting the left-hand switch for “CATV” ("CATV + 100")

also requires setting the right-hand switch for “IRC”,

“HRC”, or “STD” (standard) as desired for the given input

signal operating channel.

STANDARD CATV CHANNEL 25:

CATV

OFF AIR

IRC

HRC

STD

INPUT

CHANNEL

100

RF INPUT

2 5

CHANNEL PLAN

- Setting the left-hand switch for “CATV +100” sets a

leading ”1” to the INPUT CHANNEL thumbwheel switch

for CATV channels from 100 through 125.

STANDARD CATV CHANNEL 125:

CATV

OFF AIR

IRC

HRC

STD

INPUT

CHANNEL

100

RF INPUT

2 5

CHANNEL PLAN

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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