[Scan-DC] Measuring one and two tones

[David L. Wilson]

See
http://comtekk.us/ 


> -----Original Message-----
> From: scan-dc-bounces at mailman.qth.net [mailto:scan-dc-
> bounces at mailman.qth.net] On Behalf Of mike agner
> Sent: Sunday, April 07, 2013 12:27 PM
> To: scan-dc at mailman.qth.net
> Subject: [Scan-DC] Measuring one and two tones
> 
> 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
> 
> 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
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