DRAKE 550TCP Руководство по эксплуатации - Страница 4
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Front Panel Controls/Rear Panel Connections
Front Panel Controls and Indicators
550TCP TERRESTRIAL CHANNEL PROCESSOR
F1 POWER Indicator - Lights when the unit is connected
to a source of AC power.
F2 INPUT CHANNEL Number Switch - Sets the input
channel number for off air TV channels 02 through 69.
F3 SIGNAL Indicator - Lights to indicate that an input
signal is being received as set by the input channel
switches and is of a signal strength greater than
approximately -10 dBm. Note that if this indicator is off (no
received signal), the RF output is switched off. See also
Item F6.
F4 A/V RATIO Control - This screwdriver adjustment
varies the level of the output aural carrier over a range from
-2 to –12 dB relative to the input A/V ratio. The output
aural carrier level should be adjusted to approximately 15
dB below the visual carrier level (normal operation).
Clockwise rotation increases the output aural carrier level
and thus decreases the output A/V ratio.
Rear Panel Connections
R1
MADE IN THE U.S.A. BY
®
RF
OUTPUT
R1 RF OUTPUT - This is the converted channel output.
R2 COMPOSITE IF IN Connector - This is the composite
IF input to the output channel circuits. The composite IF
has both the aural and visual IF combined. This
connection is normally cabled directly to the "COMPOSITE
IF OUT" connector (see Item R3). This external IF loop
allows the use of accessories such as scramblers or
alternate video sources. Note that accessory equipment
must also have the visual carrier at 45.75 MHz and the
aural carrier at 41.25 MHz. Both input carriers must be at
their nominally specified levels.
R3 COMPOSITE IF OUT Connector - This is the
composite IF output from the IF circuits. The composite IF
provides a vestigial sideband filtered visual carrier at
45.75 MHz (plus or minus any input signal offset) combined
with a level controlled aural carrier at 41.25 MHz (plus or
F1
POWER
Figure 1
R2
R3
COMPOSITE IF
T-7 TO T-14
IN
IN
OUT
IF
LOOP
Figure 2
F2
F3
F4
A / V RATIO
4
4
INPUT
CHANNEL
SIGNAL
F5 OUTPUT CHANNEL Number Switch - Sets the output
channel number for standard CATV channels 02 through
78 and 95 through 99. See Table 2 - "OUTPUT
CHANNEL" in the Installation section of this manual for the
corresponding operating frequency, and offset, if any, for
each channel number.
F6 OUTPUT ENABLED Indicator - Lights to indicate that
a valid channel is selected and an input signal is being
received. The RF output is switched off for any invalid
output channel settings, no received input signal as set by
the input channel switches ('SIGNAL' indicator is off), or
other conditions that would cause the unit to operate on an
invalid frequency. See also Item F3.
F7 RF OUTPUT LEVEL Control - This screwdriver
adjustment varies the RF OUTPUT level.
Clockwise rotation increases the level.
R4
CAUTION:
OF FIRE - REPLACE
RF
UP CONVERTER
FUSE AS MARKED
OUTPUT
INPUT
AFTER DISCONNECTING
UNIT FROM AC LINE.
ATTENTION:
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU SECTEUR.
minus any input signal offset). This connection is normally
cabled directly to the "COMPOSITE IF IN" connector (see
Item R2).
R4 RF INPUT Connector - This is the input to the channel
processor circuits for all signals with video carrier
frequencies in the range of 54 through 806 MHz.
R5 FUSE Holder - Always replace this fuse with one of the
same type and rating: 1/2 Amp, 250 V, SLO-BLO, 5 x 20
mm type.
R6 LINE CORD - This is a three-wire power cable. When
the cable is connected to a properly wired AC power line
outlet, this cable grounds the instrument cabinet. Connect
to a nominal 115 VAC ±10%, 60 Hz source. Do not defeat
the safety purpose of the attached line cord plug.
F5
F6
F7
OUTPUT LEVEL
7
8
OUTPUT
CHANNEL
OUTPUT ENABLED
R5
R6
- RISK
FUSE
1 / 2 A, 250 V
115 VAC, 60Hz
SLO - BLO
30 WATTS