[Elecraft] KTCXO3 obsolete?

[Fred Townsend]

Folks:
Reading the data sheet for the Si571 I see the worst case temperature
stability is +/- 61.5 ppm. This would say the 571 could NOT possibly be used
as a standalone frequency source. It MUST be corrected. I would conclude the
TCXO is need as before wherever high accuracy and high stability is needed.
73
Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Edward
R Cole
Sent: Monday, April 20, 2015 10:01 AM
To: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] KTCXO3 obsolete?

If the new KSYN3A makes the TCXO-3 obsolete then the EXREF is also obsolete
and all of us that invested into that either cannot upgrade to KSYN3A or we
lose the use of these improvements.  That is not backwards compatible. I
seriously doubt that the TCXO-1 or TXCO-3 is not used by the new synth.

I use my K3 as IF rig for 1296-eme and "slopping" around 50 to 500 Hz is not
acceptable!  OK, I exaggerate a little.

But not only is the TCXO-3 more stable it is also more accurate.  With
addition of EXREF I get 28-MHz +/- 2-Hz accuracy which a big help when
looking for super-weak signals on 1296-eme (my
1296-28 transverter is PLL with < 1-Hz*).  Running JT-65 (not HF) on eme
requires less than 20-Hz drift when operating key-down for 50 seconds out a
2-minutes.  I get that using the K3 w/TCXO-3+EXREF.

*PS: frequency drift = K3 drift + transverter drift (its additive)

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com

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