[Elecraft] 10 MHz Reference Oscillator

[Robert Friess]

Where do I find the distribution amplifier?

Bob

On Sat, Oct 31, 2015 at 12:19 PM, Mel Farrer via Elecraft <
elecraft at mailman.qth.net> wrote:

> I agree, and when you put the GPS referenced osc against my HP8920 and the
> old HP 5346M on X-Y scope input, the circle hardly moves.
> Mel, K6KBE
>
>       From: Bob W7AVK <rolfb at accima.com>
>  To: 'Elecraft' <elecraft at mailman.qth.net>
>  Sent: Saturday, October 31, 2015 11:40 AM
>  Subject: Re: [Elecraft] 10 MHz Reference Oscillator
>
> 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
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