[time-nuts] Thunderbolt

[TheInfamousFlavio at hotmail.com]

Actually, from what I understand there is no power conditioning board.  A 
regular Thunderbolt has two boards.  A processing board and a power 
conditioning board stacked on top of each other.  The power condition board 
is whole bunch more that just a DC-DC converter.  These 1/2 Thunderbolts 
need alot of external conditioning.  You cannot just hookup a switching 
power supply from Lamda or whatever.  You need to spend alot of time and 
money to get these boards powered up with clean, stable power.  That's just 
the power.  I don't even want to think about other issues this things might 
have.  A standard Thunderbolt is worth much more than one of these.  I 
wouldn't think of buying one of these unless I was willing to spend a long 
time (and money)  building the power supplies.   Remember it's got to be 
stable as well as clean-- a couple of hijacked computer power adapters ain't 
gonna cut it.

-Flavio


----- Original Message ----- 
From: "Jason Rabel" <jason at extremeoverclocking.com>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Saturday, March 03, 2007 22:28
Subject: Re: [time-nuts] Thunderbolt


> TVB bought one of the units off eBay and was going to report in once he 
> got
> a chance to test it out.
>
> I think we have decided to put the purchase 'on-hold' until the seller
> decides to drop the price significantly.
>
> The biggest issue seems to be the missing DC-DC converter board, which
> provides a lot of line filtering and power stability for the rest of the
> unit. Without it the asking price is too high considering we are the main
> market demand, the unknown condition of the units, and most people seem to
> just want one to 'tinker' with.
>
> I just looked on eBay, and the seller has 20 units with zero purchases. He
> is including a DC-DC unit, but it appears to be for powering more than 
> just
> the thunderbolt as the amp ratings are very high and the box is like twice
> the size of the thunderbolt (not exactly compact).
>
> If I'm stepping out of line, please someone speak up and feel free to 
> smack
> me upside the head.
>
> Jason
>
>
>> Is the group purchase of the thunderbolt GPSDO still in the works?
>>
>>WA4DFS  Ed
>
>
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