Oops, the PSKmeter does NOT use the sound card -- it has its own simple
A/D converter which connects to a serial port.
--Martin
Martin AA6E wrote:
> Why not directly detect the output RF with a linear rectifier / filter?
>
> Also, why not use closely spaced tones (20-30 Hz) to make things easier
> on the sound card?
>
> This is basically what the PSKmeter
> (http://www.ssiserver.com/info/pskmeter/) does. It's very cheap. The
> question is whether the IMD numbers it delivers are useful or
> believable. Probably you need a higher quality detector if you want to
> go down to < -30 dB reliably.
>
> Agreed that what you are measuring is the exciter plus amp, but at least
> you get an upper limit. And, what we care about is what gets radiated,
> not just what the amp does.
>
> 73 Martin AA6E
>
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