Discontinued Product

Timewave DSP-59Y Noise Filter for the Yaesu® SP-5 and SP-6 Speaker Cabinet

  • Works with any radio or transceiver with standard audio speaker output
  • Includes the same highly aclaimed digital filter set found in the DSP-599zx
  • Hyperspeed DSP -- 27 nanosecond Processor with 80 KB Ram on board
  • 36.8 million instructions/second
  • Field upgradeable design keeps you up to date
  • LCD display for Visible Memory™ and Calibrated Filters™
  • Wideband filter for AM and FM (VHF & UHF)
  • Continuous filter tuning up to 5,000 Hz using optical encoders
  • Voice, Lowpass, Highpass, from 200 Hz - 5,000 Hz
  • CW and Data 10 Hz to 600 Hz wide
  • Save thousands by upgrading your current transceivers to latest technology
  • More versitle than built-in DSP's and easier to use

FIRST to Simultaneously reduce noise, kill heterodynes and QRM!

Timewave Digital Signal Processing (DSP) technology provides superior performance in reducing QRM and QRN. No other technology can do what our DSP can!

The Timewave DSP-59Y is the first Digital Signal Filter built to match existing YAESU radios using the SP-5 and SP-6 external speakers. The DSP-59Y, using the same highly aclaimed digital filterset as the DSP-599zx, is designed to fit in the phone patch slot of the speaker. It uses the existing A/B switch on the speaker cabinet, 1/4" stereo phone jack and also allows the existing analog filters to be used. The Timewave DSP module allows the owners of Yaesu equipment to maintain the Original Equipment Manufacturers appearance. This filter gives the FT1000, FT1000D, FT990, FT890, FT900, and FRG100 the latest noise reduction and filtering DSP technology.

The speaker mounted DSP-59Y can be used with other radios and transceivers made by other manufactures such as Kenwood, Icom, Ten-Tec, and Alinco. There are no design limitations in either the DSP-59Y or the speaker that prevents their use with other radios or transceivers.

The DSP-59Y is the part of the latest generation of DSP filters. The DSP-59Y has all the proven digital noise filters found in the DSP-599zx. Incorporating the newest high speed CPU and.running at 36.8 MIPS, the extra power gives the user unparalleled features and field upgradability for the future. The new backlit display, pushbuttons, Visable Memory™ lets you see the exact settings of the filter. The optical encoder gives the operator continuous tuning of filters.

Noise Reduction

The noise reduction functions of the DSP-59Y operate by examining a characteristic of signals and noise called correlation, and dynamically filtering out the undesired noise. The degree of correlation is relative. Random noise such as white noise or static is uncorrelated. Speech is moderately correlated. Heterodynes and pure tones are highly correlated. The DSP-59Y measures correlation and automatically filters out noise that is outside its correlation thresholds.

Data and Bandpass Filters

Narrow band signals like CW and RTTY require bandpass filters with steep skirts and linear phase response. Linear phase response maximizes the usable signaling rate for a given bandwidth and minimizes ringing often heard on other types of extremely sharp filters. The filter skirts are so steep that signals literally fall off the edge of the passband as you tune through them. Bandwidths range from 10 Hz to 600 Hz, and center frequencies from 200 Hz to 2100 Hz. Narrow filters are useful for trying to dig extremely weak signals out of the noise and QRM. The wider filters allow for easy tuning and listening to multiple CW signals simultaneously.

The Data filters supported in this filter are RTTY, AMTOR, PacTOR, G-TOR, HF Packet, SSTV, WEFAX, and Clover™. The RTTY data filter provides two additional methods of operation besides regular filtering. You can use the remodulator mode that detects and regenerates the mark and space to the modem or using the filter as a RTTY modem when used with a terminal program connected by a RS-232 port.


The DSP-59Y is compatible with all amateur radio transceivers and receivers. It must however be installed within an YEASU SP-5 or SP-6 external speaker cabinet.

ALL Timewave DSP Filter models SIMULTANEOUSLY Reduce Noise, Kill Heterodynes and QRM!


Check out the detailed review in December, 1996 QST for the DSP-599zx which has the same digital noise filter set as the DSP-59Y.

Timewave DSP-59Y Specifications

Audio Input A & B

Audio Output A & B

Impedance 20K ohms or 25 Ohms, jumper selectable Speaker Output power 2 watts into 8 ohms at 13.8 VDC
Signal range for full output 10 mV to 1 volt, front panel programmable Line Output 0 dB, referenced to input level. Not controlled by gain control

Headphone Jack 1/4" two circut jack, use stereo headphones to use all functions, mono headphones for most functions.

Automatic Gain Control (AGC)

Voice 36 dB
CW & Data Modes 18 dB

Noise Reduction Filters

Function Frequency range Attenuation Type Delay
Random Noise Reduction Entire freq. range of selected bandpass filter Up to 20 dB, varies with noise characteristics. Adaptive 5 ms max
Variable Noise Reduction Noise reduction aggressiveness, front panel adjustable
Heterodyne Eliminator (Multiple Automatic Notch) Entire freq. range of selected bandpass filter Up to 50 dB, varies with noise characteristics Adaptive 5 ms max
Heterodyne Eliminator (Manual Notch) Entire freq. range of selected bandpass filter Up to 50 dB, varies with noise characteristics Adaptive Manual 5 ms max
Note: The random noise reduction and bandpass filters can operate simultaneously. The random noise reduction, tone notch and highpass/lowpass filters can operate simultaneously.

Voice Filters

Function Frequency range Attenuation Type Delay
Highpass Corner freq. = 100 to 1000 Hz., 10 Hz. steps. 60 dB at 180 Hz. outside the passband FIR Linear phase 24 ms max combination highpass and lowpass filters
Lowpass Corner freq. = 1000 to 5000 Hz. 10 Hz. steps 60 dB at 180 Hz. outside the passband FIR Linear phase

CW Filters

Function Frequency range Attenuation Type Delay
CW Filters Bandwidth = 5 Hz to 600 Hz, 5 Hz steps. 55 dB at 60 Hz. outside the passband FIR Linear phase
<= 20 Hz
> 20 Hz
40 ms max.
64 ms max.
40 ms max.
Center freq. = 200 to 2100 Hz., 5 Hz. steps.
CW Marker Tone Sine wave at center freq. of selected CW filter.

Data Filters

Function Frequency range Attenuation Type Delay
RTTY, AMTOR, PacTOR, G-TOR, & HF-Packet Bandwidth = 60 Hz. to 600 Hz.
Mark/Space bandwidth 60 Hz to 100 Hz. Center freq. = 2210 Hz. plus option of 1700(default), 1360, 1300, 1530 or 2125 Hz.

40 dB at 60 H. outside the passband

FIR Linear phase

37 ms max
SSTV 1100-1300 Hz. & 1500-2300 Hz. 50 dB at 75 Hz. outside the passband Composite FIR Linear phase 37 ms max
WEFAX 1500-2300 Hz. 55 dB at 75 Hz. outside the passband FIR Linear phase 37 ms max
Clover 2000-2500 Hz. 55 dB at 75 Hz. outside the passband FIR Linear phase 37 ms max
FSK Marker Tones Alternating sine waves at mark/space frequency of selected data dilter (170 or 200 Hz shift). Baud rate matches selected data mode (e.g. RTTY marker is 45.5 baud, 170 Hz "RY" character).

RTTY Modem

Shifts 170, 200, 425, 850 Hz
Data Rates 45, 50, 57, 75 Baud
Input Audio from receiver
Output Open collector FSK and variable level AFSK
Transmit Data Polarity Normal or Reverse
I/O Receive data, Transmit data, PTT (RS-232 compatible)

Signal Processing

A-D/D-A Converter 16 bit linear, sigma-delta conversion, Analog Devices AD 1846
Signal Processor 16 bit, 27ns Analog Devices ADSP-2181 with 80 KB of memory
Processor Speed 36.8 Million Instructions /Second


Six Memories All configuration setups can be stored and recalled (except volume control setting)


2X16 alphanumeric characters, dot matrix, yellow-green backlit LCD


Size 3.25" height x 12" depth x 2.5" width (63.5 mm wide x 305 mm deep x 82.5 mm high)
Weight <2 lb. (0.908 Kg.)


12-16 VDC @ 1A, Fuse 1.6A, 5 mm x 20 mm

Note: RTTY, AMTOR, PacTOR, G-TOR, and HF Packet data filter bandwidths are specified at -3 dB points to comply with traditional data filter specification methods. All other filter bandwidths are specified to comply with conventional DSP FIR filter parametric descriptions.

Amateur Products

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