A really nice audio test tone generator

[radio8z]

Hello all,

I wanted a way to send a sine wave test tone to my AM transmitter so I could check the modulation adjustment without having to drag out my audio oscillator. I had purchased a program for converting wav files to mp3 files and discovered it includes a tool which creates a wav file with a sine, square, etc. waveform at various dB settings.

The program is called Magix MP3 Maker 2005 Deluxe and I bought it at a computer store for $14.

Click the music editor button and the tools button. Here you will find a waveform generator button. Click it, set frequency and dB and it will produce a wav file of a 10 second test tone. I looked at the signal on the output of my sound card with a scope and also with a wav editor and it was an impressive sine wave.

For a continuous tone, I play the file with Windows Media Player and set the preference to repeat forever.

This is a nice and low cost (not counting the PC) sine generator for audio testing.

Neil

 

[SamBuca]

Most of the time you can clip the sine wave to form a square wave.<P ID="signature">______________
</P>

 

[radio8z]

> Most of the time you can clip the sine wave to form a square
> wave.
>
Yes, but this program will also produce a square wave if you select that.

I recommend against using a square wave for a transmitter adjustment/test because it produces a very wide transmitted bandwidth.

Neil

 

[pbolyn]

Here's a nifty freebee audio tone generator program. It's capabilities are not apparent on the simple window that comes up. Be sure to click Help to see all the things you can do.

NCH Tone Generator 2.00

http://www.tucows.com/start_dl/341419_129883_660/dlp/
<P ID="signature">______________
Phil B
</P>

 

[radio8z]

Thanks for the tip Phil

> Here's a nifty freebee audio tone generator program. It's
> capabilities are not apparent on the simple window that
> comes up. Be sure to click Help to see all the things you
> can do.
>
> NCH Tone Generator 2.00
>
> http://www.tucows.com/start_dl/341419_129883_660/dlp/
>
Phil,

Thanks for the tip. I'll check it out.

Neil

 

[am1670acr]

> Hello all,
>
> I wanted a way to send a sine wave test tone to my AM
> transmitter so I could check the modulation adjustment
> without having to drag out my audio oscillator. I had
> purchased a program for converting wav files to mp3 files
> and discovered it includes a tool which creates a wav file
> with a sine, square, etc. waveform at various dB settings.
>
> The program is called Magix MP3 Maker 2005 Deluxe and I
> bought it at a computer store for $14.
>
> Click the music editor button and the tools button. Here
> you will find a waveform generator button. Click it, set
> frequency and dB and it will produce a wav file of a 10
> second test tone. I looked at the signal on the output of
> my sound card with a scope and also with a wav editor and it
> was an impressive sine wave.
>
> For a continuous tone, I play the file with Windows Media
> Player and set the preference to repeat forever.
>
> This is a nice and low cost (not counting the PC) sine
> generator for audio testing.
>
> Neil
>


Audacity has a nice tone generator. It will allow you to generate a Sine, Square or Sawtooth wave. It will also let you set the frequency and the amplitude. http://audacity.sourceforge.net/ It's free ware too!!!!

 

[radio8z]

>
>
> Audacity has a nice tone generator. It will allow you to
> generate a Sine, Square or Sawtooth wave. It will also let
> you set the frequency and the amplitude.
> http://audacity.sourceforge.net/ It's free ware too!!!!
>

That screen shot looks like the Music Editor screen in the Magix software I mentioned. It probably does the same thing and the price sounds right. Thanks for the info.

Neil

 

[JohnA]

Re: test tone generator, how about oscilloscopes

> > Most of the time you can clip the sine wave to form a
> square
> > wave.
> >
> Yes, but this program will also produce a square wave if you
> select that.
>
> I recommend against using a square wave for a transmitter
> adjustment/test because it produces a very wide transmitted
> bandwidth.
>
> Neil
>
I have tried to use Winscope to look at my demodulated carrier
but it's not very good. Anyone else have suggestions for 'scope'
programs using your PC and sound card?
John

PS. I am working on a field strength meter/circuit combined with
a VCO (voltage controled oscillator) that would allow peaking
your transmitter/antenna matching circuit away from the near
field. Let you know how it comes out.