Lectrosonics UCR205d User Manual

Page 5

UHF Wireless Diversity Receiver

position is useful for locating a clear frequency, since any
potential interference may be heard. It may also be used in
situations where squelching behavior is undesirable. The “PI
LOT OFF” position disables the squelch, as described below.

SQUELCH

The UCR205D employs a sophisticated squelching system in
an attempt to deliver the cleanest possible audio during mar
ginal conditions of reception. Any squelching system faces
inevitable trade-offs: squelch too much and valuable audio
information may be lost, squelch too little and excessive noise
may be heard; respond too rapidly and the audio sounds
“choppy”, respond too sluggishly and syllables or entire words
are cut off.

The UCR205D combines several techniques to achieve an opti
mal balance, removing distracting noise, without the squelching
action itself becoming a distraction. One of these techniques
involves waiting for a word or syllable to complete before
squelching. Another incorporates recent squelching history
and recent signal strength, adjusting squelching behavior dy
namically for the most serviceable result under variable
conditions. Using these and other techniques, the UCR205D
can deliver acceptable audio quality from otherwise unusable
signals.

In the “PILOT OFF” position, the squelch system is disabled.
Received audio remains unmuted at all times with this setting.

OUTPUT LEVEL ADJUST AND RANGE SWITCH

The front panel Output control will adjust the audio output
within the range set by the Lo/Mid/Hi range switch (located on
the back panel.) In the Lo position the adjustment range is from
–50dBm to –20dBm, the Mid position (center) allows an ad
justment from –30dBm to 0dBm, and the Hi position sets the
audio output to a fixed +8dBm with no front panel control.

POWER SUPPLY

The UCR205D may be operated from an external 10 to 16.5
VDC source. The power supply has a built in Poly-Fuse to
protect the unit. This fuse resets if the power supply is discon
nected for about 15 seconds.

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