[Elecraft] 10 MHz external reference - GPSDO

[David Anderson]

Oliver, I was wondering about this, I guess it is just that the short term drift is lower so it won't drift as much between frequency measurement corrections which are made for 1 second every 4 seconds according to some info recently published. I doubt it matters much though. I would be tempted to try it with the standard TCXO first.

Maybe someone from Elecraft would like to comment.

73 from David GM4JJJ

> On 12 Mar 2016, at 07:17, Oliver Dröse <droese at necg.de> wrote:
> 
> Why would I need the TCXO-3 instead of the TCXO-1 when using the K3EXREF if the accuracy and stability is provided by the EXREF? Am I overlooking something here?
> 
> Tnx & 73, Olli - DH8BQA
> 
> Contest, DX & radio projects: http://www.dh8bqa.de
> 
> 
>> Am 11.03.2016 um 22:30 schrieb Edward R Cole:
>> First one needs to realize that the TCXO establishes the basic stability, so choosing the TCXO-3 over the TCXO-1 will provide better stability and accuracy (these are two different things).  I bought the TCXO-3 with my initial K3/10 purchase so the rest of what I say is with the better TCXO-3 installed (if frequency is important then that is first thing I recommend updating).
>> 
>> Mostly, I use 28-MHz as a testing frequency since it is my VHF transverter IF.  On 28-MHz with only the TCXO-3, I see 14-Hz inaccuracy.  This 14/28000000 = 0.5 ppm (I think this is better than Elecraft specs the TCXO-3).  Adding the EXREF I see 2-Hz which is "about" 0.1ppm.  Measurements on 50-MHz are proportional.  I see 3-4 Hz accuracy using the EXREF.
> 
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