I think that if it were the K3, then I would hear a change in the pitch of a signal over the first few minutes, and I haven't noticed that. I think I'm going to do a more careful test: tune to RWM (the Russian version of WWV, which is good and loud here) and see what the change is on the K3 and the P3 in the first 15 minutes from a cold start.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 9 Dec 2017 22:45, Gary Smith wrote:
Hi Vic,

I do have the .5 TXCO but also have the
ref board attached and a GPSDO which
updates constantly and the software I use,
NMEATime 2 updates the computer time every
minute to 6 digits out.

That said, the K3 is always dead on but as
to the P3, I never have noticed the P3
doing anything but keep right in line with
the K3s frequency. I never see any
drifting when it is cold & just starting
up.

Might it be your radio drifting for a few
minutes till it warms that you're seeing?

73,

Gary
KA1J

My K3 seems quite stable (at least for CW purposes) although I donĀ“t
have a TCXO. But there is considerable drift in my P3 for the first 15
minutes or so after turn-on. This is noticeable when the span is
narrow (5 kHz). I wonder if anyone has thought about the possibility
of stabilizing it?

Vic 4X6GP
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