[time-nuts] LORAN C update

Collins, Graham CollinG at navcanada.ca
Fri Mar 2 17:04:20 UTC 2012


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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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"<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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