How to generate a 18KHz sine-wave tone?

Not sure what type of speakers you have, but if you are older than 25-30 you will likely not be able to hear it.  Whether or not your neighbors' dogs can hear it is another story.

Hmmm... What happened to my post?

I mention that a while back a cakewalk user write a plugin that functioned as a tone generator to either a selected freq or a sweep...

I can't remember either the author or plugin's name at the moment but I'm thinking it is called Tone...

Maybe someone else remembers more?

This isn't the one I was referring to, but maybe it will help?

http://forum.cakewalk.com/FindPost/3227438

promidi
 Just be ware that your neighbours dog won't be the only critter affected by this.

Yep, could also clear out any pesky teenagers hanging around, too

record the dawgs....play it back down a 1/2 octave...slowed down maybe a tad...thru a "concert capable" PA might do a similar task. 

Thanks for all the recommendations. I believe my plan may be hindered by the "you cannot get a "100W speaker" to put all 100W into a single frequency" thought from mettelus.
 
I have set-up a couple of 100W tweeters attached to separate 2-3 foot lengths of PCV (to help guide the noise only to the target problem dogs), driven by a cheap 200W car amp. But in my initial tests, the dogs don't seem to notice. I could buy more speaker wire and move the speakers closer--that may be the least expensive option. I don't know if there are inexpensive transducers that would squeal out a tone around 20KHz loud enough to reach these dogs (about 50 yards).
 
Also, in my initial test, the audio I exported and sent to my iPod for playback contained a lot of periodic clicks--not sure if this came from an exporting artifact (44.1k sample rate to a wav file) or from the limitations of the iPod, but I didn't hear it directly from my DAW.
 
Thanks again for the help!

Some things to consider:
 
http://pets.thenest.com/there-highpitched-whistle-make-dogs-stop-barking-constantly-11318.html
 
http : // pets thenest com / there-highpitched-whistle-make-dogs-stop-barking-constantly-11318
 

I'm now at the stage of having the 16--20KHz tones but after exporting them to .wav files and playing them on anything but my Focusrite Scarlett (e.g., playing them on my SoundBlaster or iPod), there are a lot of audio artifacts lower frequencies (buzzing, etc.). Yet, on the Scarlett, the master sounds fine, and if I import the exported .wav back in to Sonar and play it over the Scarlett, it looks (spectrum) and sounds fine too... so the problem isn't with the .wav exporting, but with the playback devices?
 
I'm wanting to load this .wav on an iPod 2, but that too exhibits the problem artifacts.
 
Does anyone have any work-arounds to possibly consumer hardware not being able to output high-frequency sine wave .wav files clearly? Perhaps I'm missing something?
 
Thanks!