[Elecraft] 10 MHz external reference - GPSDO

[Eric Swartz - WA6HHQ, Elecraft]

Hi Ed,

Minor note on our TCXO part numbers:

The tighter temp stability TCXO (0.5 ppm typical) is actually Elecraft part 
number "TCXO3-1". This is the p/n that shows on the K3S order page and in the 
K3S kit manual as an upgrade.

The standard TCXO (5 ppm) supplied with the K3S and K3 has the part number 
"E660033".

Regards,

Eric
/elecraft.com/

On 3/13/2016 6:14 PM, Edward R Cole wrote:
> Guys<
>
> TCXO's use temperature compensating components to try to keep frequency 
> stable.  They work fairly well if you are at lower frequencies or not 
> multiplying an LO 18 times.  Better is the OCXO (which uses a heater inside an 
> insulated "oven" to better keep temperature effects isolated).
>
> The EXREF utilizes the better stability of 10-MHz sources to correct the drift 
> of the TCXO.  I does that at a fixed interval in between which both TCXO-1 and 
> TCXO-3 will drift.  Per Elecraft's specifications on page 8 the TCXO-3 is 5 
> times more stable than the TCXO-1.  I have no idea over what time interval the 
> specs are cited, but most assuredly its more than 4 seconds.
....