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コンピュータ・ハードウェア DRAKE HCP2550AのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。DRAKE HCP2550A 16 ページ。 Commercial heterodyne channel processor (for use in ntsc systems)
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Front Panel Controls and Indicators
F1
HCP2550A CHANNEL PROCESSOR
EAS
READY
POWER
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.
F2
F3
F4
F5
RF INPUT
+
CATV
100
IRC
PRE-AMP
AFC
CATV
HRC
4
OFF
STD
AIR
OFF
ON
OFF
ON
INPUT
CHANNEL PLAN
CHANNEL
Figure 1
F6 F7
F8
F9
RF OUTPUT
PILOT
A / V
THRESHOLD
RATIO
4
LOCK
DETECT
SIGNAL
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:
RF INPUT
+
CATV
100
IRC
CATV
HRC
OFF AIR
STD
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:
RF INPUT
+
CATV
100
IRC
CATV
HRC
OFF AIR
STD
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:
RF INPUT
+
CATV
100
IRC
CATV
HRC
OFF AIR
STD
CHANNEL PLAN
F10 F11
F12
OUTPUT
LEVEL
7
8
OUTPUT
ENABLED
OUTPUT
CHANNEL
2
5
INPUT
CHANNEL
2
5
INPUT
CHANNEL
2
5
INPUT
CHANNEL