You'll need somwhat more than +14V for a generic 7812 to regulate
correctly.
Also, remember the local (to the regulators) decoupling caps, or some of
them make quite good HF oscilators!
See the data sheets for the particular regulators used for exact
details.
Dave B.
> -Original Message--
n, KE5FX
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
> Behalf Of Bob Camp
> Sent: Tuesday, March 09, 2010 9:44 AM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Realistic Tbol
> From: "Bob Camp"
> Subject: Re: [time-nuts] Realistic Tbolt phase noise
> Hi
> I think you will find that the noise floor of the ADF4107 (dividers and
> phase detector) is a bit higher than -150 at 100 Hz offset at 10 MHz. It
> should get you past the -120 lev
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Realistic Tbolt phase noise
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 applic
cussion 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
[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 t
t: Re: [time-nuts] Realistic Tbolt phase noise
To: "Discussion of precise time and frequency measurement"
Date: Tuesday, 9 March, 2010, 12:50
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
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
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 H
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 showi
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