[Elecraft] WTB Trimble ThunderBolt for K3EXREF / QS1R

[David Anderson]

Hi folks,

The inexpensive BG7TBL GPSDO units use the same Morion double oven 10 MHz Xtal osc, and in fact the distribution amp they sell also has a Morion osc included. All in a neat box with BNC sockets and ready to plug in your linearly regulated 12 Volts supply or battery. 

73

David Anderson GM4JJJ 

> On 10 Apr 2015, at 15:12, brian <alsopb at nc.rr.com> wrote:
> 
> 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.
> 
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