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FRONT PANEL CONTROLS AND FUNCTIONS
PWR LED POWER SWITCH
When lit, this LED indicates that power is applied to the
UCR195D and adequate voltage is present to operate the
unit.
PILOT LED
The audio output muting (squelch) function of the
UCR195D is controlled by a 32kHz tone modulation of
the RF carrier. The audio output is muted until this tone
is present. This LED will remain on as long as the
receiver audio is enabled by the pilot tone.
TRANSMITTER AUDIO LEVEL METER
When the meter function switch is in the Mod position,
the modulation (audio level) of the incoming signal is
indicated by a fast responding LED strip. The strip is
calibrated in 6dB steps over an expanded scale (54dB)
which provides an extremely accurate visual “picture” of
the signal dynamics, even at a distance away from the
receiver. Audio signal peaks easily exceed the response
time of VU meters, however, the LED strip is fast
enough to track even brief transients.
RF LEVEL INDICATORS
With the function switch in the RF position, the LED
strip indicates the level of the incoming RF signals. The
LED strips are calibrated to provide accurate indications
from 1uV to 1mV. The LEDs are highly visible from a
distance, making antenna set up more accurate. The
LED strip is especially useful in “troubleshooting”
difficult antenna installations.
This slide switch, and its corrosponding LED indicator,
switches the receiver from Off to internal or external
power. At turn on and off there is a delay built into the
receiver to allow various stages to stabilize before the
audio output is activated. This will prevent an audio
“thump” when powering up the receiver.
AUDIO OUTPUT
The front panel Audio Output control will adjust the
audio output within the range set by the Low/High/Fixed
range switch (located inside the battery compartment.)
In the Low position (toward the front panel) the adjust-
ment range is from –50dBm to –20dBm, the High
position (center) allows an adjustment from –30dBm to
0dBm, and the Fixed position (toward the rear panel)
sets the audio output to a fixed +8dBm with no front
panel control.
ANTENNA CONNECTOR
These are standard 50 Ohm BNC type jacks for the RF
input to the receiver. The left jack is the main antenna
and the right jack is for the diversity antenna.
ANTENNA PHASE LEDs
These two LEDs labeled “0” and “180” show the phase
difference of the signals being received at the two
antennas.
MOD
1mV
10uV
-42
RF
1uV
-36 30
POWER
INT
100uV
-12-18-24
-6
0dB
EXT
OFF
PILOT
0 180
MAIN DIVERSITY
Figure 2 - UCR195D Front Panel
8
(14 pages)
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