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[aprssig] Deviation meters

Ray Wells vk2tv at exemail.com.au
Fri Apr 6 05:26:47 UTC 2007


Stephen H. Smith wrote:

> johnk.mchugh at att.net wrote:
>
>>
>>
>> The Bezzel function for the first carrier null is 2.405. The formula 
>> is (Required Dev/ 2.405). So if you want to set the deviation to 
>> 3.5KHz, use an audio tone of  3.5/2.405 or  1.455KHz. Oh, you don't 
>> have a 1.455KHz tone, then use the mark tone from a KAM, usually 
>> 1600Hz on HF. There must be software that will produce variable audio 
>> tones from a sound card, anyone know of such a program?
>>
>> John
>
>
>
> The freeware utility bundle  "Wavetools" on my web site downloads page 
> will do this.
>
> It bundles 4 applications that use the sound card: an audio function 
> generator, an audio level (a.k.a. "V.U.) meter, a dual trace scope and 
> an audio spectrum analyzer.
> Go to < http://wa8lmf.com/miscinfo > and look for the file 
> "Wavetools.exe" near the bottom of the list.
>
>
Those tools work extremely well - love the VU meter.

Thanks, Steven, for putting them there for download.

Ray vk2tv




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