[time-nuts] Lucent Unit Differences

[Bob Camp]

Hi


> On Nov 14, 2014, at 2:55 PM, Perry Sandeen via time-nuts <time-nuts at febo.com> wrote:
> 
> List,
> 
> Wrote [Snip] The chain in the Z3810 / 3811 / 3812 Lucent
> boxes is *much* different than the setup in the earlier parts. The phase noise
> and ADEV on the Z3810’s is better than what you got on the earlier versions.
> 
> That’s good to know. I only have the older style units. It
> will be interesting see how well the older units can be *tweeked*.
> 
> [Snip] The 15 MHz buffer appears to be quiet and puts out a
> lot of power. 
> 
> Power yes, but the waveform is highly distorted.

Not on the units I have. It’s a pretty good looking signal on them. What are you seeing?

> 
> [Snip] Using it for 10 MHz would give you a *lot* of 10 MHz
> signal to play with. IF the mods are simple it’s an attractive solution. If it
> involves swapping out 30 parts -
> 
> That is the idea.  Hack (in my case) the 10 MHz from the oscillator into the 15 MHz
> circuit.  There are two i5 MHz filters to
> be bypassed or replaced.

From what I’ve seen, the circuits in the boxes have almost no resemblance at all to each other. A solution for Efratom / Datum designed boxes  would not be a solution for the HP designed \ boxes. .

> 
> The Modifying The Lucent Rubidium article uses just two
> resistors to reduce overdriving and a surplus ethernet 10 MHz to reduce spurs.
> 
> I don’t know how applicable it would be to the newer boxes\\


They most certainly have a 5 MHz output OCXO in the HP designed boxes. A quick probe with a scope is all it takes to verify this. The Z3810/11/12 is a 5 MHz based design.

Bob



> but putting a load resistor on the output and using a scope should give one a
> good idea if a mod is needed.
> 
> Regards,
> 
> Perrier 
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