I finally measured the drift that I'm seeing with my K3. I tracked this using the AFC function of Digipan while monitoring the carrier of WWV at 10 Mhz. Upon power up, I see a drift to higher frequencies of 36 Hz over the first 90 seconds, then over the next 5-10 minutes the rig drifts much more slowly downward towards the original power up frequency.
This was for a cold K3 in my 52F basement shack. I calculate a drift of 3.6 ppm which is within the spec of the 5 ppm TCXO. Steve N9SZ -----Steven Zabarnick/Research/FacStaff/UDayton wrote: ----- To: elecraft@mailman.qth.net From: Steven Zabarnick/Research/FacStaff/UDayton Date: 12/30/2008 10:15AM Subject: K3 drift During the past week I have noticed my K3 drifting during the first 20 seconds after power up. I hadn’t noticed this previously in my three month old K3 (SN 1672), so I’m wondering if this is normal? With winter here it is colder in my basement shack (maybe down 55 F), so perhaps that could explain the drift. I haven't measured the drift, but definitely have not noticed it in the past. Does anyone else observe this drift? Is this normal during warmup? Steve N9SZ
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