Being basically frugal, I used Audacity to "build" a five minute wav file conisting of two appropriate sine waves and saved it as a mono track to the SD card in my Tascam digital audio recorder. It works. It should do as well on any decent quality music "pod" that you might have around.

73

-Jim
NU0C

On Thu, 20 Jun 2024 13:53:47 -0700
"m0cnl via groups.io" <m1cxz.m0cnl@...> wrote:

Thank you all for those suggestions, but the disparity between soundcards and their coarse adjustments would mean having to to set everything up again when I move between computers.

I think that a simple two tone generator build (once calibrated and output set) will be the best solution as I won't have to do anything when moving where I work.
I can also have a range of fixed level outputs as well as a variable output costing very little more than on hand and junk box components.

Paul M0CNL