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P3 drift

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Vic Rosenthal

P3 drift

My K3 seems quite stable (at least for CW purposes) although I don’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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Nr4c

Re: P3 drift

Mine is quite stable after the 15 min warmup.

Sent from my iPhone
...nr4c. bill

> On Dec 9, 2017, at 5:44 AM, Vic Rosenthal <[hidden email]> wrote:
>
> My K3 seems quite stable (at least for CW purposes) although I don’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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Gary Smith-2

Re: P3 drift

In reply to this post by Vic Rosenthal

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 don´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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
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> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
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Leroy

Re: P3 drift

In reply to this post by Vic Rosenthal

So I have the K3s TCXO, and no P3 drift. Are they not related?

73 Leroy AB7CE

-----Original Message-----
From: Vic Rosenthal
Sent: Saturday, December 09, 2017 3:44 AM
To: Elecraft Reflector
Subject: [Elecraft] P3 drift

My K3 seems quite stable (at least for CW purposes) although I don’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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Vic Rosenthal

Re: P3 drift

In reply to this post by Gary Smith-2

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 don´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

Vic Rosenthal

Re: P3 drift

In reply to this post by Leroy

The P3 has a reference oscillator that is adjustable in the menu. It can
drift relative to the K3. I need to do a more careful test to try to
determine where the drift is originating.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 9 Dec 2017 23:29, lmarion wrote:

> So I have the K3s TCXO, and no P3 drift. Are they not related?
>
> 73 Leroy AB7CE
>
> -----Original Message----- From: Vic Rosenthal
> Sent: Saturday, December 09, 2017 3:44 AM
> To: Elecraft Reflector
> Subject: [Elecraft] P3 drift
>
> My K3 seems quite stable (at least for CW purposes) although I don’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
>

Don Wilhelm

Re: P3 drift

In reply to this post by Vic Rosenthal

Vic,

Remember that the P3 IF is tunable from 455kHz to 21MHz.
That means you can tune the P3 to the RWM signal. You will not hear
anything, but you should see the signal on the display and can see how
much it moves.

73,
Don W3FPR

On 12/9/2017 11:51 PM, Victor Rosenthal 4X6GP wrote:
> 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.
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