[Elecraft] K3 dumb Q about PPM, less dumb one about NB

[Guy Olinger K2AV]

>From the Elecraft web page, K3 options:

" KTCXO3-1  TCXO 1ppm (0.5 ppm typ) High Stability Reference Oscillator"

Do you have the KTCXO3-1 option? If so, it's within spec.  If you
don't have the KTCXO3 your K3 is within KTCXO3 spec without having to
buy the option.

In the good old days, if the equipment had to be within one Hz at
power up at 10 Mhz, it had crystal and oscillator ovens that ran 24/7.

Using the temperature correction matrix (individual data that comes
per KTCXO3) is in the firmware-to-do list. Posting the data to K3
stable memory is in the current K3 utility.  I have my data taped in
my paper K3 manual, both having arrived here in the package for #1239.
 Mine (with the KTCXO3) last time I checked moves 3 or 4 Hz depending
on how cold I let the shack get. When the firmware is in place it may
be possible to fiddle with the supplied TCX data and tune it pretty
tightly.

73, Guy.

On Thu, Apr 1, 2010 at 10:12 AM, lstavenhagen <lstavenhagen at hotmail.com> wrote:
>
> Hi all,
>
> Just refreshing my 6th grade education here: 1 ppm variation at 10 mhz would
> be +/- 10 hz correct? I calibrated my K3 ref. osc. again yesterday (against
> 10mhz WWV) after a warmup of about an hour - this am I turned it on and
> checked it against 10mhz WWV and the display read about 6 or maybe 7 hz high
> (against my spot tone in CW mode).
>
> I'm shocked, I tell you shocked... that this thing is off by 6hz when you
> first turn it on, what kind of operation is elecraft to let something like
> this through...... that'd be approx .6ppm drift right?
>
> As for the noise blanker question, sorry if this is in the docs, but the NB
> on/off state doesn't save when you change bands (tho the settings of it are
> changed).  It always turns off when changing bands. Is this configurable?
> (i.e. save on/off state of NM per band)?
>
> No, I don' t need Wayne/Eric to change this if this is by design hi hi. Just
> curious (and again sorry if this is already in the documentation, which I'm
> still reading through).
>
> Tnx es 73,
> LS
> W5QD
>
>
> --
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> Sent from the Elecraft mailing list archive at Nabble.com.
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