[Elecraft] KTCXO3 obsolete? (Not)

[Wayne Burdick]

Fred,

You're correct. 

We use the Si570 in the KSYN3A to obtain extremely low phase noise. But we still have to lock it to the 49.38-MHz reference. The synth stays locked to the reference within about +/- 0.2 Hz on all bands. This is a definite improvement over the original KSYN3.

73,
Wayne


On Apr 20, 2015, at 10:36 AM, "Fred Townsend" <fptownsend at earthlink.net> wrote:

> 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