Fire Tone Decoder II 
Instantly discover fire dispatch pager tone frequencies with our easy-to-use tone decoder.
• Unattended operation
• Single-Tone or Two-Tone dispatch logging and voice capture
• Records dispatcher audio to WAV files
• Instant replay of last tone-out
• Fully supports Windows Vista
Read the review on RadioReference.com
Read on for complete description...OR see the online User Manual.
ComTekk 2-Tone Decoder utilizes the latest in Digital Signal Processing (DSP) technology to instantly and accurately measure the frequencies of a received two-tone paging signal or "fire dispatch tone out" signal.
Receiver audio output is fed into the computer's sound card (via cable or microphone) where an A/D converter reads the signal's instantaneous voltage 11,025 times per second. This is the sampling rate. With time and magnitude data, the software first processes each batch of samples by applying a band-pass filter or window, thereby ignoring any frequencies outside the range of 300-5,000 Hz. Another filter searches for continuous tones, ingoring noise, voice and digital communications.
The tone frequencies are displayed immediately on screen. Now, simply enter the two frequencies into a two-tone alert radio such as the Uniden BCD396T to be alerted any time that tone-out is sent.
Any single or dual sequential tone format such as:
Not compatible with dual-tone signaling such as DTMF or SELCAL.
with a "Fire station tone-out" feature.