[time-nuts] Sound Cards for locking to GPSDO 10 MHz references

Jeffrey Pawlan jpawlan at pawlan.com
Mon Jun 1 18:08:24 EDT 2009

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 


Jeffrey Pawlan  WA6KBL

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