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Last modified 2026-09-23

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W9GR / Quantics DSP III (DSP-3)

A picture of W9GR / Quantics DSP III (DSP-3)

SPECIFICATIONS

GENERAL
Type:External DSP filter
Power supply:12 VDC (Male barrel jack, center positive)
Current drain/power consumption:Max 400 mA
Dimensions (W*H*D):? mm (?")
Weight:? g (? oz)




AUDIO SECTION
Noise reduction:QRN reducer
Selectable bandwidths:See the manual
Frequency response:See the manual
Audio input:RCA/Phono jack
Audio output:RCA/Phono jack
Headphones: TS "Minijack" (3.5 mm)




MISCELLANEOUS
Manufactured:USA, 1995-xxxx (Discontinued)
Additional info: Automatic notch filter.

Improvements over the DSP II include:
13 bit audio codec instead of 8 bits for a much wider dynamic range.
Optional AGC in the LMS adaptive modes.
Software AGC in the LMS adaptive modes.
SSTV filter.
European low tones RTTY/FSK filter.
DTMF decoder with memory.
CTCSS/PL decoder with memory.
1.8 kHz brick wall SSB filter.
2.1 kHz brick wall SSB filter.
More CW filters.
CW filters can be tuned.
Related documents: User/assembly manual (238 KB)
Modifications and fixes:
Reviews: Communications Quarterly: Summer 1995, page 85
QST: August 1995, page 73
Applicable radios: