[Lowfer] eLoran test July 29 - Aug 15

[hvanesce at comcast.net]

Thanks Craig and Garry,

The receiver info is a big help, and the Loran info also much appreciated.

I forgot about Markus's Loran grabber; great data! (thanks Markus).  The
phase plots (particularly Anthorn-Neurnberg daylight-path) are quite
interesting.

I'm glad to see the eLoran NYSE result. Indoor cultural noise is tough at
100kHz; but indoor 100kHz refraction (and the minimal reflection) is almost
deterministic in a multipath context, giving LF a big net advantage over the
more-prevalent signals for outdoor-to-indoor timing, so it's great to see
the NYSE example.  Just thinking about an LF RX loop antenna on the floor of
the NYSE makes my head spin. At that noise level, is a full turn overkill?
Congrats to that LF/Loran signal.

Thanks,

Jim AA5BW


-----Original Message-----
From: Lowfer [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of craig
wasson
Sent: Monday, August 8, 2016 2:32 PM
To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
Subject: Re: [Lowfer] eLoran test July 29 - Aug 15

My Loran receiver gets a solid signal day or night here in the Martinsburg,
WV area.  The Loran receiver's signal/noise indicator goes from 00 to 99 and
at night I get a 99 reading but during the day it drops to a 95 or so
reading - still not bad.  I'm using a random wire antenna on the Loran
receiver - I also have an e-probe antenna, but the random wire seems to work
better.

The e-probe antenna is on my sdr-IQ and visually I see a solid signal over
the 90-110KHz range day or night.    And the Wildwood transmitter shows up
very well for several hours per day on the Loran-C grabber in Nuremberg that
you can find here:
http://www.df6nm.bplaced.net/LoranView/LoranGrabber.htm
I like how that grabber gives you a 10-day history of all of the worldwide
Loran signals.

If you look at the maps from some of the eLoran presentations they seem to
think that 3 transmitter locations will cover the entire USA. Since they are
only trying to do timing, I suppose the reception requirements are
similar to WWVB.   I think that when they synchronize the receiver with the
pulse rate they end up with an effective bandwidth of a fraction of a Hz, so
that probably explains why they don't need a very strong signal.
Earlier tests proved reception of the timing signals from eLoran on the
floor of the New York Stock Exchange using a magnetic loop antenna.  Not bad
for indoors around all of that electronic equipment.

Craig - N6IO


On Sun, Aug 7, 2016 at 6:47 AM, Garry <k3siw at sbcglobal.net> wrote:

> Jim, I use a basic e-probe/SDR-IQ for reception. There are many more, 
> improved SDR choices available today. I'm not familiar with the 
> Cloud-IQ but with 24 bits that's a good thing. Not good is the lack of 
> an external clock input. I've modified one of my SDR-IQs to run off a 
> GPS-locked external clock. Perhaps that's not too hard to do for the 
> Cloud-IQ. The Cloud-IQ has a TCXO while the SDR-IQ just has an XO. 
> However, I've noticed that as long as the SDR-IQ clock is recently 
> calibrated it's quite stable when used in a normal hamshack 
> environment. For example, no problem decoding Wolf transmissions. 
> Perhaps others will chime in with their opinions of what today's best
receiver is from a performance/cost viewpoint.
>
> 73, Garry
>
>
>
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