Multi-Decoder

Features & Specifications

1. Features

ComTekk Multi Decoder makes use of the computer sound card and software DSP (Digital Signal Processing) techniques to decode and instantly display paging, DTMF, and CTCSS tone-encoded information.

ComTekk Multi Decoder will listen for any sustained tone signal and display the frequency or frequencies. Audio recording may be triggered by single or two-tone activation.

Standard Features:

Single and 2-tone decoding
Standard tone sets
DTMF decoder
CTCSS decoder
DCS decoder (v.1.2) Unfiltered audio or discriminator tap required!
Audio squelch
Adjustable trigger delay
VU meter
Sound card calibration
Data Hold & Clear
Data logging (CSV file)
Built-in log viewer/player
Tone-activated audio recording
Serial port control for external relay (bell, lights, etc.), triggered by any 2-tone or DTMF sequence.

For detailed operating instructions, proceed to Using Multi Decoder.

2. Specifications

NOTE: These specifications apply only to the ComTekk Multi Decoder software. Hardware specifications will vary between different computers and sound devices.

**General Specifications :**
2-Tone Decoder Frequency Response:	250Hz ~ 4 KHz
Input Sampling Rate:	11.025 KHz (8KHz DTMF)
Max. Error (calibrated sound card) :	+/- 2.7Hz
Min. detectable tone duration (2-tone):	approx. 400 mS
Min. frequency change between A/B tones:	10 Hz
Calibration tone :	1,000 Hz reference (WAV)
CTCSS Decoding :	All standard tones from 67.0 ~ 259.1 Hz, 10% modulation min.
DCS Decoding :	Requires a receiver with discriminator (unfiltered) output - It is not possible to decode DCS from the audio/speaker output on most scanners!
DTMF Decoder timing:	40mS/20mS min. on/off
Audio Recording Format :	WAV
Relay hold time :	1 - 99 seconds

Disclaimer:

Actual performace will vary between different computers and sound cards. The author makes no warranties or guarantees of performance or suitability for any particular purpose, and assumes no liability whatsoever for the use or mis-use of any software products.