Hi,
I am using an ADF4107 and a Crystek resonator, with a LBW of
a few 100 Hz. It behaves perfect outside the loop, but inside the
loop it is too noisy (not too important for my application, but
just curious).
I ll try to measure the Thunderbolt directly at 10Mhz, but the
my HP 11729C needs some mods for this.
Christophe
On 09/03/10 18:21, Bob Camp wrote:
Hi
How are you multiplying it to 1 GHz and checking it?
I've seen multipliers that have issues beyond about -130 at 100 Hz. It's not
common, but it can happen.
------------------
The supply provided by TAPR is a pretty basic unit. It would not surprise me
if some were better than others. They also may work better on US mains
voltage than they do on international voltages. I would rig up another
supply and see what happens. That would at least rule out the supply as an
issue.
In a previous post the idea of putting a 7805 and 7812 regulator on the
TBolt came up. If you have +14 available that seems like the best thing to
try.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Christophe Huygens
Sent: Tuesday, March 09, 2010 7:50 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Realistic Tbolt phase noise
This is with the power supply as provided by TAPR so should be ok.
Xtof.
On 09/03/10 13:44, Bob Camp wrote:
Hi
Power supply noise would be the first thought.
Next up would be grounding inside the Thunderbolt (card to case,
connectors to case).
Bob
On Mar 9, 2010, at 7:32 AM, Christophe Huygens wrote:
Hi,
I noticed several vendors on Ebay have the t-bolt on sale.
However, the once showing their own PN plots seem to get only
-115, -120 dBc/Hz at 100Hz. Yet,
http://www.leapsecond.com/pages/tbolt/noise.htm seems
to have mucht better results: up to -150 depending on
power supply.
By multiplying to 1GHz I also seem to be getting something
like -75 or - 80 rather than -110.
Any thoughts?
Christophe
on4iy
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