Hi Richard, As the Thunderbolt is wired as DCE (Data Communictions Equipment A.K.A a modem with data out on pin 2 and data in on 3) Pin 6 would be a more appropiate choice. It's the "DCE ready" output so should be compatible with a PC. I don't know what the current draw of the monitor is, but a bit of series resistance and a series diode to the pin would make it pretty bullet proof. Worse case would be if you connected it to a item that had pin 6 tied directly to a "stiff" -12V supply. Robert G8RPI.
--- On Wed, 17/2/10, Richard W. Solomon <[email protected]> wrote: From: Richard W. Solomon <[email protected]> Subject: Re: [time-nuts] Fluke1 Monitor To: [email protected] Date: Wednesday, 17 February, 2010, 0:15 I cut the lead on pin 4 of the RS-232 connector and hooked it to +12 vdc. That way I eliminate using another supply. Seems to work alright. Just need to make sure that pin 4 of the Computer's Serial Port doesn't have a compatibility problem. (Just means I can't hook up a computer to the T-Bolt if there is). 73, Dick, W1KSZ -----Original Message----- >From: Mike Naruta AA8K <[email protected]> >Sent: Feb 16, 2010 4:44 PM >To: Discussion of precise time and frequency measurement <[email protected]> >Subject: Re: [time-nuts] ko4bb monitor > > >Thunderbolt PRECISION GPS 10mhz Standard's LED Monitor > >I received two from fluke.l 16 days after I sent my PayPal payment. > >It was well-packaged and he fit both in one box to save me >shipping costs. > >They came with a DB-9P already soldered on the cable and a >typical DC power jack. He even included shells for the DB-9P. >They both powered up fine and started talking with my >Thunderbolts right away. Current drain is about 75 ma at >start-up and then falls to 50 ma (13.6 volts). > >It's not Lady Heather, but I can monitor my TBolts at a glance >without tying up PCs. > > >Mike - AA8K > > >Arthur Dent wrote: >> The display I got from fluke.l (ordered 12-4-09) ran on +5V but the one I >> got from Amazon had a 3-terminal regulator and would run from 7-20V and was >> designed for +12V. I just noticed Bob's Ebay listing has been changed to add >> this note: >> >> "because of some reasons,i change one IC on the PCB, >> so the buyer whom bought the display unit after 2009.12.25 Please use the 9V >> for >> the Power supply. 12v also OK." >> > >_______________________________________________ >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. _______________________________________________ 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.
