[Scan-DC] Measuring one and two tones

[cameron zotter]

Thanks Mike. I'm trying to make something similar to the Fire Tone Out
feature from Uniden (I think).

I want the scanner to be silent until there is a priority call. Once there
is a priority, I have programmed some LEDs to light and a Radio Shack
Buzzer to sound. Once I hear that buzzer, I go over and unplug the audio
jack to the scanner to listen to the priority.

Basically my wife is tired of hearing the scanner on all the time.

Right now I'm using an Arduino <http://arduino.cc/> to listen for patterns
in the audio levels coming out of the scanner. By taking an average of the
sounds input readings, I've been able to figure out when the alert tone
sounds. Then I trigger the LED and Buzzer alarm. Next week, I hope to
upgrade to an actual tone decoder circuit.








On Sun, Apr 7, 2013 at 12:26 PM, mike agner <ka3jjz1 at verizon.net> wrote:

> Yesterday, Alan wrote:
> ==============================**======================
> There was a program that would decode the audio frequency.  I think it was
> counter.exe.
>
> Maybe Mike Agner can help us with the link?  I couldn't find it.
>
> Is there something better we can use to decode single and two-tone
> signaling?
> ==============================**=======================
>
> Many folks that I know that want to measure tones use the free multi
> platform package Audacity. And AFAIK, some of the scanner groups on Yahoo
> have
> counter.exe in their files area.
>
> Anyway, this link into the RR Wiki should help
>
> http://wiki.radioreference.**com/index.php/Fire_Tone_Out<http://wiki.radioreference.com/index.php/Fire_Tone_Out>
>
> It's important to note 2 things;
>
> a. Soundcards aren't particularly accurate as, say, a lab measurement
> instrument. Being consumer in nature, their alignment can and likely does
> vary from unit
> to unit. If you can dig up the alignment procedure for your soundcard, it
> would certainly be a little more accurate, but keep in mind, we are dealing
> with a consumer
> unit here. There will be a degree of error inherent in any such
> measurement.
>
> b. Although Uniden scanners are the only ones set up to react to FTOs, any
> scanner or even a receiver (i.e. R7000, R2500) can be used to receive them
> and be
> used as a signal source.
>
> Mike
> ______________________________**______________________________**__
> Scan-DC mailing list
> Home: http://mailman.qth.net/**mailman/listinfo/scan-dc<http://mailman.qth.net/mailman/listinfo/scan-dc>
> Help: http://mailman.qth.net/mmfaq.**htm<http://mailman.qth.net/mmfaq.htm>
> Post: mailto:Scan-DC at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>