[time-nuts] LORAN C update

Steve steve-krull at cox.net
Fri Mar 2 18:49:06 UTC 2012


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 <semiflex at comcast.net> 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"<CollinG at navcanada.ca>  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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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<CollinG at navcanada.ca>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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