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West Mountain Radio
Operating Manual
Thank you for choosing the CLRdsp ClearSpeech
®
Noise Reduction Digital
Signal Processor. The noise reduction circuit and audio amplifier in CLRdsp
is extremely effective in improving communication clarity. Mobile and base
operation is less fatiguing and much more fun!
CLRdsp noise reduction is superb due to the Digital Signal Processor (DSP)
passing voice and CW sounds, while attenuating noise, such as atmospheric
noise, hum, hiss, whistles, and static. It effectively removes heterodynes,
ignition noise, lightening crashes, power line noise. The process is dynamic
and changes with the interference and the signal, but the effect is rewarding.
QSO’s are more fun without all the background noise. The DSP recognizes the
intermittent nature of CW and allows it to pass noise free.
CLRdsp may be mounted in any convenient location, such as under a station
speaker. It fits perfectly under the West Mountain Radio COMspkr. Included
are two (2) 6ft. cables with 1/8-inch stereo audio connectors for audio input and
external speaker output. Volume, tone and DSP filtering levels may be adjusted
by use of the front panel controls. A headphone connector on the front may
be used with any mono or stereo headphone set. The unit also includes a 6ft.
power cable with Powerpole® connectors that will plug into a 13.8 volt supply.
Choosing a Mounting Location
The CLRdsp should be placed nearby for easy operation and close to the radio,
speaker, and power supply. The 6ft. cables can be lengthened with extensions.
This unit is not weather resistant and suggested to use in a dry place out of
direct sunlight.
Connections
Rear Panel
SPKR LEVEL IN
: 1/8” jack that accepts audio from a low-impedance external
speaker jack or headphone output jack typically found on Amateur transceivers.
Use one of the supplied stereo patch cables to connect to the radio. If a radio
has a stereo output, the CLRdsp will only receive the left audio channel (tip).
A stereo cable is supplied because they are always safe to use even in mono
jacks. The audio input is transformer coupled within the CLRdsp to reduce the
chance of ground loops.
LINE IN:
1/8” jack that accepts audio from a low-level source, typically found on
the headphone jack of portable Shortwave receivers. If using such a radio, use
this jack instead of the SPKR LEVEL IN jack.
LINE OUT:
1/8” jack provides a line-level filtered audio output suitable for
recording. It can be connected to the LINE-IN (or MIC-IN) jack on a computer
using a stereo patch cable for digital recording using suitable software. Only the
left audio channel (tip) is passed.
