[time-nuts] Is this measurement for real?
wb6bnq
wb6bnq at cox.net
Sat Dec 7 17:51:08 EST 2013
Hi Dave,
Well, the question is do you think that is good or bad for the sound card ?
Bill....WB6BNQ
quartz55 wrote:
>I've been testing my soundcard measurement capability with Speclab, so I hooked my LPRO Rb to lock my Moto Service Monitor, fed the 1K audio out into the sound card and I measured the freq over about a half hour. I got a spread of about 107uHz. I've tried a few other things through my TS2000 using a 1500Hz tone from the USB and I can see when the fan goes on and off although I have the RX main osc locked to the GPSDO with the XRef from VK3HZ. I can only assume the drifting in the RX is due to the DSP processing crystal drifting with temp. I get about 13mh drift on that. Anyhow, here's a shot of the 1000Hz directly into the soundcard with Speclab. http://i251.photobucket.com/albums/gg287/DogTi/time/1k30m_zpsc4173981.jpg I almost don't believe it, does anyone else?
>
>Dave
>N3DT
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