[Elecraft] 10 MHz Reference Oscillator

[David Anderson]

Yes, I bought one as well, along with the matching  8 channel distribution amplifier which is equally well made.

There is a review by VK2XAX Tim Tuck of a later model which may have fixed that tiny error in phase. 

I also read an interesting article about the 5MHz leakage from the Morion Oscillator ( at -50dBc). [The Morion is really a 5MHz OS X with a frequency doubler to 10 MHz] and yes, I do know what a double oven is and we are not referring to that type of double.

I hope the following link works for Tim's review of the GPDSO

https://drive.google.com/file/d/0B9Oysj7clpT7YTBWSjlfNTI1aTQ/view

73

David Anderson GM4JJJ 

> On 31 Oct 2015, at 18:40, Bob W7AVK <rolfb at accima.com> wrote:
> 
> For evaluation I purchased last spring directly from China one of the BG7TBL 10 mhz sine output GPS Defined Oscillators when the price was $125.  These very nice units are now being sold from CA for a bit more and comes with everything needed, Unit, GPS antenna, power supply. http://www.ebay.com/itm/10MHZ-Output-Sine-Wave-GPS-Disciplined-Clock-GPSDO-GPS-Antenna-Power-Supply-US-/261977676713?hash=item3cff161ba9:g:ZJQAAOSwrklVf3wV 
> 
> It uses the Russian Morion Double oven crystal oscillators controlled by voltage feedback against the  GPS1 pulse per second signal using a very long time constant control loop.  If you would like a block drawing contact me directly.
> 
> I gave the unit to KE5FX, a member of the "Time Nuts" group, who has the equipment to evaluate it.  His results are posted at http://www.ke5fx.com/gpscomp.htm It was found due to the pulse width method of creating the Morion oscillator control voltage this unit was operating 2 to 3 times ten to the minus 11 cycles low.   I wouldn't get too upset at this as that error would only be 3 hz off at 100 GHZ.
> 
> Found the unit works great as a master reference for not only the K3 but lab gear like counters and signal generators.
> 
> 73  Bob  W7AVK
> k