[Elecraft] Now looking for a K3S KTCXO3-1

[Mike Cizek W0VTT]

Greetings - 

I have a KTCXO3, a Chinese copy, and the standard oscillator.  I tested the
standard and Chinese ones against WWV at 10 MHz using the Freq Cal mode in
WSJT-X over a four hour period.  This isn't exactly a laboratory grade test,
but is the best I can do.

The total error for the Chinese TCXO was 1.26 Hz
Total error for the stock oscillator was 0.98 Hz
I'll test the KTCXO3 later today.
I'm not a math major, but that looks like about 0.1PPM error.  Tests were
run after the K3s had been on for a few hours.

I don't have the tools to measure phase noise.  Would having a local with a
panadaptor look at my transmitted signal using the different oscillators be
sufficient?

This is the Chinese oscillator I bought from Ebay:
https://www.ebay.com/itm/KTCXO-3-Compatible-Elecraft-K3-TCXO-1-PPM-High-Stab
ility-Ref-Osc-Compatible/182814802678?hash=item2a909c82f6:g:7qsAAOSwWr5Z2Y7t


----
73,
Mike Cizek W0VTT

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Mark Goldberg
Sent: Wednesday, 10 March, 2021 08:56
To: Elecraft Mailing List <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Now looking for a K3S KTCXO3-1

If the Chinese TCXOs for the K3 are anything like the ones for Kenwood I
have measured, they exhibit much higher phase noise. That will result in
much increased transmit phase noise. That will interfere with anyone trying
to listen close to you in location and frequency.

The K3 is a good neighbor, which is one of the reasons it is prized for
DXpeditions and Multi Radio contest stations.

73,

Mark
W7MLG

On Wed, Mar 10, 2021, 7:33 AM Wes <wes_n7ws at triconet.org> wrote:

> If it mattered to me I would give the Chinese version a shot.
>
> Wes  N7WS
>
> On 3/10/2021 6:18 AM, Gary Peterson wrote:
> > A replacement K3S KTCXO3-1 is no longer available from Elecraft.  
> > Does
> anyone have a stable KTCXO3-1, surplus to their needs, that they would 
> consider selling?
> > Even a standard, plus or minus 5 ppm TCXO might possibly be an
> improvement.
> >
> > There are also some, alleged, KTCXO3-1 oscillator modules for sale 
> > on
> eBay for about 40 bucks.  Has anyone had experience with any of these?
> >
> > Thanks, in advance, for any advice, opinions or admonishments.
> >
> > Gary, K0CX
>
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