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
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