Pulsar TC-10B, Руководство пользователя

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Page 14–2 October 2003
TC–10B System Manual
Technologies, Inc.
14.2 Front Panel Controls and
Displays
The controls and displays, for the Universal
Receiver set as an AM Receiver/Detector, along
with the two alarm indicators at the bottom of the
panel are shown in Figure 14–2 for the TC–10B.
These controls and displays are described below.
(Please see “Frequency & Sensitivity Setting”
later in this chapter for setting instructions.)
Frequency Display
The frequency display is at the top right of the
module’s front panel. It is a four- (4-) digit green
LED. During normal operation, it shows the
current receiving frequency. When in the “setting”
mode, it displays instructions and various
messages.
Carrier Level Indicator (CLI)
The Carrier Level Indicator is directly beneath the
frequency display. It provides a tri-color bar graph
showing a range of -20 to +10dB, in 5dB incre-
ments. There is also an external CLI circuit to
drive a remote 0-100µA external meter, 10 to
350Vdc.
Push button Controls
The recessed, push button controls are as follows:
CANCEL/RAISE—When in the “Setting”
mode, this button raises the frequency,
sensitivity, or external CLI settings. It also
lets you skip the sensitivity setting option
after you set the frequency.
LOWER—This button lowers the frequency,
sensitivity, or external CLI settings.
SET—This button initiates the “Setting”
mode and accepts the displayed settings,
Alarms
The alarms for the AM receiver:
LED and corresponding relay are both energized
when receiving a signal above the detect
threshold. The detect threshold is always at
approx. –2dB on the CLI bar graph.
DETECT—Detect relay: normally open
contact only
LED and corresponding relay are both energized
when receiving a signal above the margin
threshold. The margin threshold is always at
approx. –15dB on the CLI bar graph.
MARGIN—Margin relay: selectable nor-
mally open (NO) or normally closed (NC)
contact; relay is energized when signal
level is above the margin setting. Use J3 on
the bottom board to set the NO or NC
position.
14.3 Specifications
The Universal Receiver Module’s technical speci-
fications are shown in Table 14–2.
The module’s ON-OFF frequency spacing specifi-
cations are shown in Table 14–3.
UNIVERSAL RECEIVER
CANCEL / RAISE
LOWER
SET
AM: MARGIN DETECT
FSK: LOW NOISE
SIGNAL
kHz
+10
+5
0
–5 dB
–10
–15
–20
2500
Figure 14–2. Universal Receiver Front Panel.