[time-nuts] Where does 28V come from?

[Robert Atkinson]

Others have said it all, but see MIL-STD-704F < http://assist.daps.dla.mil/docimages/A/0000/0003/5901/000000433000_000000038767_BDJDANQSPS.PDF?CFID=32790482&CFTOKEN=123a955522c88712-9E5138E6-1372-548A-D3D5BB2597F5676D&jsessionid=0630a8f7f91d568172ed > or < http://assist.daps.dla.mil/quicksearch/basic_profile.cfm?ident_number=35901 > for specifications and MIL-HDBK-845 < http://assist.daps.dla.mil/docimages/A/0000/0011/0257/000000482523_000000172526_MROJWPALXS.PDF?CFID=32789554&CFTOKEN=578349968949c304-9E4997F9-1372-548A-D384056DE208ED29&jsessionid=0630a8f7f91d568172ed > or http://assist.daps.dla.mil/quicksearch/basic_profile.cfm?ident_number=110257 > for more info.

28V needs half the current for the same power. This results in lighter wires, switches etc. The newest standard for cars (Automobiles) is 42V bus with 36V (3x12V) battery standard, they are jumping 28/24V completely. 

Robert G8RPI.

--- On Tue, 21/7/09, Hal Murray <hmurray at megapathdsl.net> wrote:

> From: Hal Murray <hmurray at megapathdsl.net>
> Subject: [time-nuts] Where does 28V come from?
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Date: Tuesday, 21 July, 2009, 7:59 AM
> 
> >     That said, the modules also appear
> to be powered by 28VDC, add some
> > regulation, you could use the chassis to power the
> Thunderbolt, and
> > mount it in one of the blank panels. 
> 
> Lead acid batteries are close to 2V per cell.  For
> cars/trucks, they come 
> conviently packaged in 6V and 12V units.  The phone
> company works off 48V.
> 
> But where does 28V come from?
> 
> The Isotemp OSCO 127-10 data sheet says 27 V, but that's
> +3, -6 or 21-30V 
> which straddles both 24V and 28V.
>  
> 
> -- 
> These are my opinions, not necessarily my employer's. 
> I hate spam.
> 
> 
> 
> 
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