FRONT PANEL CONTROLS AND FUNCTIONS
AUDIO OUTPUT LEVEL
A high quality VU meter is used to monitor the audio ouput level, providing an accurate indication of the average audio output
level. The VU meter sensitivity is adjusted with a rear panel control to compensate for the difference in transient response rise
time between the VU meter and the LED strip below the meter. Depending upon the dynamic characteristics of the audio
source, it may be necessary to adjust for headroom in the VU meter.
If the signal peaks exceed full modulation, distortion or audible compression could occur. In the past, it was common practice
with other designs to adjust the VU meter sensitivity to allow headroom, compensating for the slow rise time of the VU meter.
These older designs did not have peak reading indicators, therefore, by the time the VU meter indicated 0dB, the actual peak
level was far above full modulation. The DR195 output and VU meter headroom controls provide an absolute level reference
and calibrated sensitivity adjustments.
TRANSMITTER AUDIO LEVEL
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. The combination of the LED strip and the conventional VU meter provides a com-
plete and accurate visual monitoring of signal levels and dynamic range.
RF LEVEL INDICATORS
Two separate LED strips are provided to indicate 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
dual LED strips are especially useful in “trouble-shooting” difficult antenna installations.
OPTI-BLEND LEDs
The DR195 receiver operates with a method of audio ratio blending of two audio outputs. RF level in each receiver is compared
and the audio signals from the two receivers are mixed together in a ratio that favors the quieter receiver. As this blending action
occurs, the brightness of the two OPTI-BLEND LEDs will vary. The brighter the LED, the more audio is being mixed in from
that receiver.
AUDIO OUTPUT LEVEL
TRANSMITTER AUDIO LEVEL dB
LIM 0
-6
-12 -18 -24 -30 -36 -42 -48
500 250 100
50
25
105
RF LEVEL
CH A
CH B
A B
DIVERSITY
MODE MONITOR POWER
LECTROSONICS
OPTI
BLEND
PILOT
1uV 2 uV 1mV
3
2
1
0
12
3
5
7
10
20
0
20
40
60
80
100
Figure 2 - DR195 Front Panel
8
(28 pages)
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