Thanks for all the information, this is an great group. Does anyone have the shematic on the box?
BR. Thomas. 2011/6/12 Ed Palmer <ed_pal...@sasktel.net>: > Is there more than one hardware version of the T'bolt? > > Mine has U18 (right behind the RS-232 connector) as an Intersil ICL232IBE. > This is a dual RS-232 transceiver that includes a doubler and inverter to > generate plus and minus 9 to 10 volts from the +5 input. It appears to have > the required capacitors on the bottom of the board. The open circuit RS-232 > voltages on mine are just under 10 volts which seems a little low for a 12 > volt source. > > I didn't try to run mine without -12, but the presence of that chip and > messages on this list made me think that the -12 was only used for the DAC. > > Ed > > WarrenS wrote: >> >> I've run test of the effect of the Neg supply on a Tbolt's operation and >> the effect on it's noise. (It would seem I'm one of few nuts that actually >> test things) The Neg supply effects the RS232 neg swing and the neg output >> of the DAC. >> As long as the Dac out (OSC EFC input) is > than a couple of volts above >> the neg supply (or the EFC is positive) all worked fine at any Neg supply >> down to -3 volts. >> This is because most RS232 receivers don't need their input to swing >> negative. >> Your -7 volts statement agrees well with my test. You can go even lower on >> the neg supply with no ill effects IF you do not need the DAC output to go >> all the way to neg -5Volts. >> >> ws >> PS I did not test for the effects with a Neg supply less than -3 volts, It >> may of been able to go even lower, I just wanted to insure it was reliable >> with -5 volts for my application. >> >> >> ****************** >> >> [time-nuts] Thunderbolt no usable sats. >> Arthur Dent golgarfrincham at yahoo.com >> "It may or may not be used for tuning voltage but what I said is >> 100% correct. The Andrew/Grayson units these T-Bolts were >> used in provided -7 VDC for this negative supply and the same >> T-Bolts work properly on -12 VDC. If this voltage is missing, the >> com port will not work." >> +++++++++++++++ >> Please read what I actually said. Do you disagree that these units will >> not run on -7 VDC or that the com port will not work if the negative supply >> is missing? >> -Arthur >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Please avoid sending me Word or PowerPoint attachments. See <http://www.gnu.org/philosophy/no-word-attachments.html> _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.