[Elecraft] 10 MHz Reference Oscillator

[Jeff Schmidt]

I see both a sine wave and a square wave version available on ebay. The
K3EXREF doc references both w/ regard to signal source, so I assume
either would work.

Initially, I'll only be connecting a K3, is one a better choice than the
other?


Jeff KC9WSJ

On 10/31/2015 01:40 PM, Bob W7AVK 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