[time-nuts] LORAN C update

bg at lysator.liu.se bg at lysator.liu.se
Fri Mar 2 19:38:18 UTC 2012


The antennas I use mostly at work accept between 2.5V and 24V. Most
receivers I use give around 3.3V. In the basement I have receivers giving
12V to the antenna.

There are receivers giving 5V, but it is much less dominant than 10 years
ago.

--

   Björn


> 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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