DRAKE HCP2550A Manual de instruções - Página 9

Procurar online ou descarregar pdf Manual de instruções para Hardware informático DRAKE HCP2550A. DRAKE HCP2550A 16 páginas. Commercial heterodyne channel processor (for use in ntsc systems)

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CONNECTIONS AND CONTROLS – All connections to
and from the HCP2550A are made through the rear panel.
Figure 3 shows a typical two channel processing
installation involving the converting of an off-air signal and
a CATV signal. Additional channels can be processed by
using additional channel processor units and either
multi-port combiners or combinations of two-port
combiners.
INSTALLATION NOTES – Level adjustment provides
optimum performance in multichannel installations. The
channel processor outputs should be checked periodically
with a spectrum analyzer to maintain a ±1 dB variation of
adjacent channel carriers. Aural/Visual (A/V) ratios
should be held to –15 dB or less. The 'Output Level' and
'A/V Ratio' controls are used respectively to make these
adjustments. If an output level of less than +50 dBmV is
required, add an attenuator of the appropriate value to the
modulator output.
Example: For an output level of +45 dBmV, add a 12 dB
attenuator pad to the modulator output and set the
output level.
OUTPUT CHANNEL IS DIFFERENT FROM INPUT CHANNEL:
AFC "ON"
HCP2550A
MADE IN THE U.S.A. BY
®
RF OUTPUT
FCC OFFSET
EAS IF IN
--
+
0
FCC OFFSET: "+" (automatic)
AFC "ON"
HCP2550A
MADE IN THE U.S.A. BY
®
RF OUTPUT
FCC OFFSET
EAS IF IN
--
+
0
FCC OFFSET: "+" (automatic)
2-WAY SPLITTER/
OUT
OUT
RFI
dB
-130
MHz
5-1000
SPLITTER
2-WAY
3611
IN
RF OUT
TO SYSTEM
+
CATV
100
IRC
AFC
CATV
HRC
4
4
OFF
STD
AIR
OFF
ON
INPUT
CHANNEL PLAN
CHANNEL
SIGNAL
COMPOSITE IF
EAS
STRENGTH
IN
OUT
IF LOOP
+
CATV
100
IRC
AFC
CATV
HRC
2
5
OFF
STD
AIR
OFF
ON
INPUT
CHANNEL PLAN
CHANNEL
SIGNAL
COMPOSITE IF
EAS
STRENGTH
IN
OUT
IF LOOP
COMBINER
Figure 3 - Typical Multiple Channel Processor Installation -
Output Channel Is Different From Input Channel
RACK MOUNTING – Adequate ventilation is very
important in multichannel installations. Units should be
spaced apart by at least one panel height wherever
possible, and some air movement is advisable in
enclosed rack cabinets. Excessive heat will shorten
component life and unit performance will be degraded
without proper cooling.
FCC PAR.76.612 – Certain cable channel frequencies
assigned to aviation and navigation communications
require frequency offsets. The OUTPUT CHANNEL
switches set the output frequency for a visual carrier
frequency of 'xx.25' or 'xxx.25' MHz only. The exact
output frequency, however, is relative to the input
frequency and is offset plus, minus, or no offset on
required channels according to the setting of the rear
panel "FCC OFFSET" switch. Refer to the 'Output
Channel' list included in this manual to determine the
required offset for a particular output channel.
OFF-AIR
7
8
OUTPUT
ENABLED
OUTPUT
CHANNEL
CAUTION:
- RISK
OF FIRE - REPLACE
EAS
PILOT
FUSE AS MARKED
AFTER DISCONNECTING
AUTO
OFF
ON
UNIT FROM AC LINE.
ATTENTION:
- RISQUE D'INCENDIE -
MANUAL
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU SECTEUR.
CATV
3
1
OUTPUT
ENABLED
OUTPUT
CHANNEL
CAUTION:
- RISK
OF FIRE - REPLACE
EAS
PILOT
FUSE AS MARKED
AFTER DISCONNECTING
AUTO
OFF
ON
UNIT FROM AC LINE.
ATTENTION:
- RISQUE D'INCENDIE -
MANUAL
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU SECTEUR.
Installation
FUSE
115 VAC, 60 Hz
1 / 2 AMP, 250 V
--
SLO
BLO
RF INPUT
SERIAL #
FUSE
115 VAC, 60 Hz
1 / 2 AMP, 250 V
--
SLO
BLO
RF INPUT
SERIAL #
5
30 WATTS
30 WATTS