[Elecraft] 10 MHz external reference - GPSDO

[Edward R Cole]

Eric,

Thanks for the correction/update.  That fits my measurements, 
exactly.  I recall about the time the EXREF came out the better spec 
was given on the TCXO03-1.  Regarding the use of wrong part 
terminology (TCXO-3) its just sloppy memory of the exact product 
number.  I think most knew what is being described.  Interesting that 
the TCXO03-1 is ten times better stability over the TCXO.

The EXREF reduces 0.5ppm to 0.1ppm on my K3, which is what was cited, 
I believe.

73, Ed - KL7UW

At 08:37 AM 3/14/2016, Eric Swartz - WA6HHQ, Elecraft wrote:
>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.
>....

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