Well, today has been a rather perplexing day.
I've been making a digital mode interface for my FT-857; I want to let it sit here in the shack WSPR'ing away. For WSPR see:
So the construction of the interface was very simple, I used some of the building blocks here, this is a great site run by Ernie, WM2U:
And the interface looks like this:
Then there is a high spec PC soundcard which is used for the SDR receiver:
And now (as you will see from the photo above) I am planning to use a USB soundcard for interfacing to the FT-857 I have here.
All was going great, the soundard installed fine, I was receiving WSPR on 20M, I tried the PTT circuit which was also working great. Then I put the software into TX and everything stopped after about a ms of audio out. I then spotted that the USB soundcard was red hot.... I happened to have two of these USB devices, so I tried the other one. That one got even hotter.....
I guess this is what you can expect from an ebay purchase that cost me something like £1.20 including delivery.
You live and learn... I need an alternative third soundcard.
I'll keep you posted.