[time-nuts] Thunderbolt Supply

[k6rtm at comcast.net]

Larry-- 

I use a +12 volt linear supply (an open-frame leftover) with a 7805 for the +5 rail. For -12, I use a 2 watt isolated dc-dc converter (leftover from another project). 

As others have stated, the +12 rail seems to be the noise sensitive one. 

73 bob k6rtm in silicon valley 

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Message: 4 
Date: Thu, 10 Feb 2011 15:16:55 -0800 
From: Larry McDavid <lmcdavid at lmceng.com> 
Subject: [time-nuts] Thunderbolt Supply 
To: Timenuts <time-nuts at febo.com> 
Message-ID: <4D5471E7.4050109 at lmceng.com> 
Content-Type: text/plain; charset=ISO-8859-1; format=flowed 

Greetings! I am a new member of the mail list. I've been using a HP 
Z3801A GPS-steered standard but have just acquired a Trimble Thunderbolt 
GPS Disciplined Clock. 

I'm seeking a recommendation for a power supply for this Thunderbolt 
receiver. There is much discussion about noise from some switching 
supplies and the effect on phase noise of the 10 MHz output. The 
Thunderbolt manual specifies the following supply and loads: 

+12 vdc 750 mA 
+ 5 vdc 400 mA 
-12 vdc 10 mA 

This combination is somewhat unusual in that the highest current is on 
the 12 volt output rather than the 5 volt output. I'm asking if list 
members have a favorite power supply for this unit, why and where I can 
obtain one. 

-- 
Best wishes, 

Larry McDavid W6FUB 
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)