Thanks Greg. That sounds very reasonable is where my current thinking is.
Failing any conflicing information I may find, I will start my testint with 5V Cheers, Graham ve3gtc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg Broburg Sent: March 2, 2012 11:52 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] LORAN C update 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.
