West Mountain Radio CLRdsp ClearSpeech Bedienungsanleitung

www.westmountainradio.com

1020 Spring City Drive

Waukesha, WI 53186

262-522-6503

[email protected]

the property of their respective owners.

CLRdsp ClearSpeech®

Noise Reduction Digital

Signal Processor

West Mountain Radio Operating Manual

Thank you for choosing the CLRdsp ClearSpeech®Noise Reduction Digital

Signal Processor. The noise reduction circuit and audio amplier in CLRdsp

is extremely e󰀨ective 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 e󰀨ectively removes heterodynes,

ignition noise, lightening crashes, power line noise. The process is dynamic

and changes with the interference and the signal, but the e󰀨ect 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 ts 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 ltering 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 ltered 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.

West Mountain Radio Operating Manual

SPKR OUT: This 1/8” jack connects to a low-impedance external speaker. The

CLRdsp uses a bridge amp type output which means it is important that your

external speaker is not grounded. The tip is positive and the sleeve is negative.

Use one of the 6ft. stereo cables provided to connect to the external speaker.

Recommended for a 4 or 8-ohm external speaker. Do not use a powered

external speaker with this jack as these typically have grounded sleeves.

Power Jack: The CLRdsp comes with a 6ft. power cable. One end is a 2.1 mm

power plug (tip hot) and the other is a pair of Powerpole® connectors. RED is

for PLUS 13.8 VDC and BLACK is for Ground. If using other connectors, just

remove the Powerpole®and connect the white striped wire to PLUS 13.8 VDC

and the other wire to ground. The CLRdsp is protected from a reverse polarity

power connection. A small 1-amp 12 or 15-volt, wall mount power supply (wall

wart) may be used to power the CLRdsp. The plug required is 5mm OD with a

2.1 mm pin, and the pin is positive. West Mountain Radio carries an appropriate

supply for 117 VAC.

Front Panel

Headphone Jack: The front panel headphone jack can work with mono or

stereo headphones. A jumper (J8) is provided on the main circuit board to

select which type of headphones will be used with the CLRdsp. Remove the

case screws carefully and locate jumper J8.

Jumper J8 ON: Stereo headphones (audio fed to both tip and ring)

Jumper J8 OFF: Mono headphones (audio on the tip only)

Warning: Do not connect shield contact on HDPH or Spkr Out to DC ground.

The high level audio works ne with modern 8 to 600 ohm headphones.

Plugging in headphones will mute the external speaker.

Important: The headphone jack should only be used with headphones. Do

not make a connection here that would cause the sleeve to be grounded, for

example a connection to external equipment.

Controls

Volume Control: The desired volume level from the external speaker may be

controlled with the volume knob on the front of the CLRdsp unit. Headphone

volume will also be a󰀨ected. Adjust the radio’s volume control and this control

to achieve the desired audio output.

Tone Control: Adjust the tone control for desired level of bass/treble response.

Filter Control: Adjusts the amount of active DSP ltering.

West Mountain Radio Operating Manual

Operating

CLRdsp is easy to operate. When power is supplied to the CLRdsp, the CLIP LED

will turn green to indicate the unit is on.

The front panel “Filtering’ control allows continuous DSP level adjustment. When

turned fully counterclockwise, the DSP is bypassed. When turned fully clockwise,

maximum DSP ltering is realized. Maximum ltering is rarely needed during use.

A recommended setting is at the 10 - 12 o’clock position for typical HF channel

conditions. If the unit is powered up and the ltering knob is fully clockwise, the

rmware version is reported in Morse Code.

If the incoming audio level is too high the CLIP LED will ash. Reduce the input

just below ashing. Clipping disrupts the noise reduction circuit.

Noise Reduction Performance

The noise reduction is dynamic and adaptive. It senses the random character of

the voice or CW and permits it to pass through. The repetitive nature of the noise

is sensed and reduced according to the patented algorithms. Take notice of the

DSP battling the di󰀨erence between the voice and the noise when both are at

equal level and the noise is constantly varying.

When the signal is CW, its intermittent character is sensed and the CW is passed

through. The noise is attenuated. When the noise is steady, such as a heterodyne

from a 40 meter broadcast station (carrier whistle), it is attenuated greatly to over

50 dB or about 0.003 times the original value. If the noise is a varying siren, it is

greatly reduced as well, but not as much as a heterodyne.

Transient sounds are greatly reduced, especially if they are repetitious. The net

e󰀨ect of the Digital Signal Processor is to reduce atmospheric noise, static, hiss,

ignition noise, power line noise, carriers, hum, and heterodynes, while passing

voice and CW signals.

The adaptive nature of the noise reduction is apparent by observing its convergent

time. A single audible tone will vanish in about 1 second. White noise diminishes

in 1 to 2 seconds. Typical car noise and emergency alarms take about 2 seconds

to reduce.

Power Amplier

CLRdsp contains a power amplier integrated circuit. It produces 7.5 watts RMS

maximum into an 8 ohm loudspeaker, when connected to a 13.8 volt DC source.

The voltage gain is 46 dB typically. The amplier has protection from a shorted

speaker.

West Mountain Radio Operating Manual

Specications

Enclosure Aluminum, powder coat painted

Dimensions 5.75 x 4.25 x 1.25 inches

Power Requirements 9 to 16 Vdc; 1.1A typical before onset

of clipping

Audio Input High impedance, 0.01 VAC

Voltage Gain 46 dB

Audio Output Power 11 watts RMS into 4 ohms @ 13.8 VDC

Maximum Audio Output Voltage 7.75 Vrms

Input Clipping Level 0.04 volts RMS

Noise Reduction Characteristics Adaptive, single tone greater than 50 dB

Powerpole® is a registered trademark of Anderson Power Products

ClearSpeech Adaptive Speech Filter

The ClearSpeech Adaptive Speech Filter is an algorithm designed to lter noise

from audio signals containing both speech and noise. It is implemented in a

circuit board containing DSP circuitry and a small audio power amplier.

Immunity from RF Interference

CLRdsp contains circuitry to reduce interference from the transmitted radio

signal. There are lters on all input wires, and decoupling capacitors at key points

throughout the electronics. There is a ferrite inductor in series with the positive

power lead.

Speaker level input is via a coupling transformer. The speaker level input ground

is not connected to the power return. This helps reduce any ground loops.

CLRdsp Warranty

CLRdsp is warranted against failure due to defects in workmanship or materials for one year

after the date of purchase from West Mountain Radio. Warranty does not cover damage

caused by abuse, accident, misuse, improper or abnormal usage, failure to follow instructions,

improper installation, alteration, lightning, or other incidence of excessive voltage or current.

If failure occurs within this period, return the CLRdsp or accessory to West Mountain Radio

at your shipping expense. The device or accessory will be repaired or replaced, at our option,

without charge, and returned to you at our shipping expense. Repaired or replaced items are

warranted for the remainder of the original warranty period. You will be charged for repair or

replacement of the CLRdsp or accessory made after the expiration of the warranty period.

West Mountain Radio shall have no liability or responsibility to customer or any other person

or entity with respect to any liability, loss, or damage caused directly or indirectly by use or

performance of the products or arising out of any breach of this warranty, including, but not

limited to, any damages resulting from inconvenience, loss of time, data, property, revenue, or

profit, or any indirect, special incidental, or consequential damages, even if West Mountain Radio

has been advised of such damages.

Except as provided herein, West Mountain Radio makes no express warranties and any

implied warranties, including fitness for a particular purpose, are limited in duration to the

stated duration provided herein.

www.westmountainradio.com

1020 Spring City Drive, Waukesha, WI 53186

tel 262-522-6503 fax 262-522-6504

FCC INFORMATION

Note: This equipment has been tested and found to comply with the limits for

a class B digital device, pursuant to part 15 of the FCC Rules. These limits

are designed to provide reasonable protection again harmful interference in

a residential installation. This equipment generates, uses and can radiate

radio frequency energy, and if not installed and used in accordance with

the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular

installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment o󰀨

and on, the user is encouraged to try to correct the interference by one or

more of the following measures:

• Reorient or relocate the receiving antenna

• Increase the separation between the equipment and receiver

• Connect the equipment into an outlet on a circuit di󰀨erent from that to

which the receiver is connected

• Consult the dealer or an experienced radio/TV technician for help

Modications not expressly approved by the manufacturer could void the

user’s authority to operated equipment under the FCC Rules.

Inhaltsverzeichnis

Andere West Mountain Radio Signalprozessor Handbücher

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