Soundcards for USB are poor at best.
I have a set of PCI cards that were previously made by EMU and they accept
external reference input. They no longer make the model I have but perhaps
they have another PCI card with an external ref input.
I am interested in your modulation technique which allows you to use WSJT.
Please let me know exactly what you are doing. I also do not know how you are
using 5 milliHertz with WSJT since the group of discrete tones occupy more
bandwidth.
73,
Jeffrey Pawlan WA6KBL
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