[GPS_Standard] Power supply for stand alone GPS time base

[Roberto Barrios]

Hi Feyssac,

 

I'm working on something similar, but simpler than yours.

 

Don't you have pictures to share with us ? :-)

 

Regards,

Roberto, EB4EQA

 

> Date: Mon, 30 Mar 2009 18:57:09 +0200
> From: "Feyssac jacques" <feyssacj at wanadoo.fr>
> Subject: [GPS_Standard] Power supply for stand alone GPS time base
> To: <gps_standard at mailman.qth.net>
> Message-ID: <012901c9b158$906f9540$0c01a8c0 at perso1c5f52446>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hello All !
> On this side of the pond we took the following schematic:
> Main power supply : 28,5 volts SMPS 2,5 Amps powering the general BUS
> 1? Linear Fet regulator 27,6 volts 200mA feeding two 12 volts sealed batteries in serial
> 2? SMPS regulator delivering 21 volts to rubidium time base
> 3? SMPS regulator delivering 6 volts to three low drop 5 volts linear regulators for powering :
> - The VE2ZAZ control board
> - The 10 mHz isolation/buffer/linear amplifiers powered only when a BNC is connected (to reduce permanent
> power consumption
> - The NMEA display
> A diode switch will connect the battery suply to the bus in case of main failure, so there is no lost of synchro
> We try by every ways to reduce the power consumption as the equipment is working permanently.
> Final result is excellent without any spurious modulation to the 10 mhz signal
> 73 to all
> Feyssac jacques


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