Additional note I am looking at 8970 F offset and its rolling down very
nicely on 2 austron 2100 series recvrs. 2.3 e-10 so far and its only been
accumulating/measuring the offset for 30-40 min.
So it looks like the chain c references are still in good shape.
My reference for comparison is a HP 3801 thats been running at least 48
hours.
I may not let it drift down to some final result.
Instead, think I will go hunting for other chains.
Regards
Paul

On Fri, Mar 2, 2012 at 9:30 AM, paul swed paulswedb@gmail.com wrote:

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@navcanada.cawrote:

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@febo.com [mailto:time-nuts-bounces@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@navcanada.cawrote:

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and follow the instructions there.

My LORAN antenna pre is fed with 8V down the coax.

On Fri, Mar 2, 2012 at 4:05 PM, Collins, Graham CollinG@navcanada.cawrote:

Azelio,

I had not considered 8V, duly noted.

Failing to find any technical details I guess I will just have to do some careful experimentation.

Cheers, Graham ve3gtc

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Azelio Boriani
Sent: March 2, 2012 10:23
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] LORAN C update

My LORAN antenna pre is fed with 8V down the coax.

On Fri, Mar 2, 2012 at 4:05 PM, Collins, Graham CollinG@navcanada.cawrote:

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and follow the instructions there.

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@navcanada.ca 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:

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@febo.com [mailto:time-nuts-bounces@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:

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and follow the instructions there.

rats !!! A couple months ago I turned down an offer of $25 for two
commercial marine units made in 2009 from a freighter being over
hauled at one of the local shipyards.

On Fri, Mar 2, 2012 at 6:30 AM, paul swed paulswedb@gmail.com wrote:

At 12 EST in Boston it sounds like the 8970 chain went off the air. I do
hear another chain 10 db lower or -78 db. Will try to see if whats I hear
is the south east or central chain.
Preamp is still good as on the long wire I do not hear anything on the 3586
Regards
Paul

On Fri, Mar 2, 2012 at 9:51 AM, paul swed paulswedb@gmail.com wrote:

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@comcast.net wrote:

I shipped my Loran receiver to the south hemisphere a couple of months ago for the cost of shipping, not sure if it ever made it.
I suppose no news is good news?

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: paul swed paulswedb@gmail.com
Sender: time-nuts-bounces@febo.com
Date: Fri, 2 Mar 2012 12:55:43
To: Time-nutstime-nuts@febo.com; paul swedpaulswedb@gmail.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] LORAN C update not all GRIs are back on

At 12 EST in Boston it sounds like the 8970 chain went off the air. I do
hear another chain 10 db lower or -78 db. Will try to see if whats I hear
is the south east or central chain.
Preamp is still good as on the long wire I do not hear anything on the 3586
Regards
Paul

On Fri, Mar 2, 2012 at 9:51 AM, paul swed paulswedb@gmail.com wrote:

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and follow the instructions there.

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