I think 5v is most common now days, too. The old Odetics GPStat (even older than the GPStar!) provided regulated 8 or 9 volts, I forget which. I had to add a 5v regulator to allow use of a newer antenna.
Good luck with the testing, Graham! Steve On Mar 2, 2012, at 10:51 AM, Greg Broburg <[email protected]> wrote: > I am an engineer and avionics tech. They were powered up the coax from the > Apollo IIMorrow 602-604-808-612-618 by a regulated internal supply. I believe > that it was either 5V or 8V most likely 5V. All of the GPS antennas that I am > aware of are powered up the coax by 5V. It is very important that this > Voltage be very clean and these radios were built to operate from 11 to 32 V > because the aircraft are either 14 or 28V systems and there was no desire to > build different units for different Voltages. I have several of these old > radios, suppose I could power one up and see what it is. > > Greg > > On 3/2/2012 10:36 AM, Steve wrote: >> Graham, >> >> If the preamp was powered from aircraft power rather than from the receiver >> coax it may be 24v. >> >> Steve >> WB0DBS >> >> >> On Mar 2, 2012, at 9:05 AM, "Collins, Graham"<[email protected]> wrote: >> >>> Paul, >>> >>> That would be my guess too but these preamps are ex aircraft installations. >>> >>> As to documentation, yes "real" documents are not easy to find but there is >>> always the change that someone on this list has some first hand knowledge >>> of these preamps. >>> >>> Cheers, Graham ve3gtc >>> >>> >>> >>> -----Original Message----- >>> From: [email protected] [mailto:[email protected]] On >>> Behalf Of paul swed >>> Sent: March 2, 2012 09:54 >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] LORAN C update >>> >>> Graham can only speculate that they were 8-12V. Most LORAN antennas were. >>> As fars as actual docs. Boy thats awful rare. >>> Regards >>> Paul >>> >>> On Fri, Mar 2, 2012 at 9:50 AM, Collins, Graham<[email protected]>wrote: >>> >>>> On the subject of Loran C, I have a couple of Loran C antenna preamps >>>> kicking around that I have not up to this point done anything with. This >>>> talk of Loran C being "back on" has me thinking of the getting something >>>> set up to try and receive these new signals. >>>> >>>> What I have is one each of II Morrow Loran Preamp A-6 and an Arnav >>>> 455-6021 T-1000. >>>> >>>> Trouble is I don't have any documentation. >>>> >>>> Can anyone point me where I might find some online documentation for >>>> either or both of these devices? >>>> >>>> I assume they require their power via the coax but couldn't guess as to >>>> whether it's 5, 12, 24, or 48V. >>>> >>>> Cheers, Graham ve3gtc >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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. >> _______________________________________________ >> 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.
