[Elecraft] WTB Trimble ThunderBolt for K3EXREF / QS1R

[brian]

Agree.  I've got one here.  One can set it to Rb and it stays put within 
5 milliHz or so.
The warm up time to get within the 5 mHz window seems to be about half 
an hour.
Long term stability is pretty incredible.

Also they are cheap.

Getting rid of it for anybody that's interested.
Also a Rb (LPRO-101) unit is available.

73 de Brian/K3KO
On 4/10/2015 12:29 PM, David G4DMP wrote:
> Ed & others -
> >From my experience in using Rubidium and GPS disciplined standards, I
> feel that a far better bet is to use an MV89A 10MHz Double-oven CXO. It
> requires only a 12V d.c. supply.
>
> I built one into a Hammond die-cast box (with no ventilation) with its
> own integral linear PSU, regulated with an L78S12CV regulator. On
> switch-on it draws 34W from the supply mains, which steadily reduces to
> 9W after about 12 minutes when the oven attains its working temperature.
>
> Using a 10-turn 10K pot the frequency can be finely adjusted to within
> 1/100 of a Hz and it locks the K3 perfectly with the K3EXREF installed.
>
> 100% recommended.
>
> The MV89A is available on eBay and the datasheet is at
> http://morion.com.ru/catalog_pdf/MV89-OCXO.pdf
>
> 73 de David G4DMP
>
>>> A caveat regarding the use of simple "wall wart" 12v PS for supplying
>>> a OCXO.
>>>
>>> I am using a Morion OCXO as 10-MHz reference for my K3EXREF and for my
>>> synthesized A32 PLL in my DEMI 1296 transverter.  I got reports of
>>> 120-Hz sidebands on my signal (-10dBc) turned out to be due to
>>> excessive AC ripple riding on the 12v coming from my wall wart supply
>>> that I was using to power the OCXO.