Are the two diodes really back to back? I have use two in parallel to enhance the time the diodes will conducting. Due to current hogging, the diodes will effectively turn on one at a time.
-----Original Message----- From: EB4APL <[email protected]> Sender: [email protected] Date: Sun, 10 Feb 2013 02:08:17 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] NTGS50AA Power supply Nate, I have it already connected to a 48 V supply according to the vendor instructions (fluke.l is a vendor with technical knowledge)and now I removed the PCB from the case that I furnished and found that my unit doesn´t have such bridge. Instead it have a quite elaborate reversal power protection (a series diode, two fuses and a pair of back connected diodes which will blow the fuses if the power is reversed and the first diode fails shorted) so I think that there are dual supply models (according to my documentation) and single supply ones, as my unit appears to be. Thank you for the suggestion to change the 1/2PPS to 1PPS by software, I'll try it. Regards, Ignacio EB4APL El 09/02/2013 17:54, Nathaniel Bezanson wrote: > Open it up, you'll find a bridge rectifier as the first component on the > incoming power. > It's actually much easier to solder straight to the pins of that component, > rather than trying to bodge something together that would poke into the > backplane connector. :) > I know there's a TSIP command for *other* units to change their PPS into PP2S > (even second), so try throwing 8E-4E at this unit and see if you can change > it the other way. Haven't had a chance to try it on the local one. > -Nate- > EB4APL wrote: >> Hello, >> >> According to a Nortel specification document (Dual Voltage Global >> Positioning System Timing Module (GPSTM) OEM General Specification >> Dataset Name: GSBW50AA), this GPSDO is dual voltage and can be powered >> either from -48 V or + 24 V systems. Mine is working from a 48 V power >> supply but I´m afraid to test it at 24 V because the polarity should be >> reversed and if my assumption is not true I can damage the unit. >> Do you know if these units are dual voltage or my documentation refers >> to other model?. Has anybody operated it at 24 V?. >> Another question, is there any internal 1PPS signal available? >> Of course, my unit is of ebay - China origin. >> >> Regards, >> Ignacio EB4APL >> _______________________________________________ _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
