[Elecraft] Calibrating KTCXO3 with the XG3

[Don Wilhelm]

Slava,

Most external reference sources have an output of +10 dBm or somewhere 
around that level.
It is not a matter of simply calibrating, the external reference is 
intended to be connected continuously.
Yes, there is a data table created that can be used when the reference 
is not present.

I really can't answer about the level of the XG3, but I am certain the 
frequency accuracy it is not as tight as a real external reference - 
rubidium standard or GPS disiplined oscillator.  The spec for the XG3 is 
+/- 50 ppm while an external reference is typically stated in parts per 
billion.

73,
Don W3FPR

On 4/29/2014 11:18 PM, Slava Baytalskiy wrote:
> Hello again, everyone!
> I just installed the K3EXREF board in my K3 and i also have the KTCXO3 unit in there from before.
> The idea was to use the XG3 as the external 10 MHz reference for calibration.
> I wasn't thrilled with the accuracy of the zero-beat method that i was using (or rather i wasn't thrilled with MY accuracy).
> I think i did the procedure correctly: went to REF CAL menu, enabled the K3EXREF, hooked up the BNC cable, the asterisk started flashing, the frequency changed (clearly the zero-beat i did before wasn't correct).
> My only question is about the output level of the XG3: i used the zero dBm. But the calibration procedure mentioned that the reference signal should be between +4 dBm and something else (higher).
> XG3 doesn't seem to go that high though. Is that ok? Using zero dBm for this?
>
>