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    Re: LORAN-C to be shut down.
    From: Gary LaPook
    Date: 2009 Dec 5, 00:03 -0800

    I know we have some commercial air pilots on the list and was
    wondering if
    they thought an aircraft RDF unit could be easily mounted on a boat.
    The
    aircraft industry seems to be the only ones making small units these
    days.
    I might go ocean cruising with a friend who is presently re-fitting
    his
    boat, and I am a big fan of redundancy, and thought this might be a
    workable
    solution.
    
    ---------------------------------------------------------------------------
    
    An ADF will work on a boat but they aren't cheap, the readout is only
    marked every 5 degrees and the antenna has to be mounted somewhere. If
    you want RDF capability just by an inexpensive digitally tuned
    portable radio that covers the LF band such as the Grundig G5 which
    also covers HF and has SSB capability so you can get your time
    signals  too. These all have ferrite rod internal antennas which are
    highly directional. Get one and tune a distant station. Then orient
    the radio in different attitudes and rotate the radio until you get a
    null which will let you know the orientation of the ferrite rod. Then
    you can use the edge of the radio to indicate the direction to the
    station. Place it on top of a universal plotting sheet to use as a
    compass rose placed on a table or nav station desk and rotate the
    radio to get a null. You may want to make a calibration table for it.
    Don't worry about the lack of a sense antenna which are really only
    needed by an ADF since a human can easily determine which is the
    correct bearing, the 180 degree ambiguity, which is a big problem for
    an ADF, is not a problem for a human.
    
    gl
    
    On Dec 4, 11:48�am, Bruce Hamilton  wrote:
    > If GPS goes dark, Jeremy will be in a great position to negotiate a salary
    > raise.
    >
    > �I had great hope for e-loran as going to a single system with no redundancy
    > seems risky at best. Even when Loran C coverage was poor, even the
    > information from a single chain would give you something to work with. In
    > the middle of Lake Superior, coverage was always spotty, and on the East
    > Coast of Canada we would often be on a single chain only 50 miles off the
    > coast.
    >
    > Jeremy, do you still have a working RDF? �I used them on aircraft all the
    > time, but must admit the one on the first ship I was on was not often used
    > and this was pre-gps. I have a working portable (Ray Jefferson) RDF that I
    > am going to try in a friend's boat. It is a pity that the technology got
    > left behind in the GPS age as the modern RDF's are apparently very good and
    > very quick. The signal from the multiple antennas is instantly processed and
    > you get an bearing read out. �The Canadian Coast Guard use them to get
    > instant fixes from distress signals in pre-GMDSS days. They have remote
    > stations they use to get a cross bearings from. No GPS required.
    >
    > I know we have some commercial air pilots on the list and was wondering if
    > they thought an aircraft RDF unit could be easily mounted on a boat. The
    > aircraft industry seems to be the only ones making small units these days.
    > I might go ocean cruising with a friend who is presently re-fitting his
    > boat, and I am a big fan of redundancy, and thought this might be a workable
    > solution.
    >
    > A fine page of old RDF units 
    >
    > On Fri, Dec 4, 2009 at 8:09 AM,  wrote:
    > > �I read the following on a maritime forum site. �Looks like LORAN-C
    > > systems run by the US will be shut down sooner than we thought.
    > > -----------------------------
    > > The US Coast Guard released an internal message advising of the imminent
    > > termination of the long range aid to navigation Loran-C. Current plans call
    > > for the termination process to commence on 4 January 2010. The process is
    > > expected to take several months. ALCOAST 
    675/09(11/25/09).
    > > *Note: This will mark the end of an era that started during World War II.
    > > The Loran system has improved greatly over the years and was on the edge of
    > > yet another advance: to enhanced Loran (eLoran). It is unclear how other
    > > nations, which operate their own independent Loran-C systems, will react to
    > > this development. *
    > > Courtesy: Bryant�s Maritime Blog � 1 December 
    2009
    > > ------------------------------
    >
    > > Not that this will affect many large ships. �My ship hasn't had LORAN
    > > capabilities since the antenna broke 3 years ago and the captain was too
    > > afraid to order a new antenna. �Most merchant ships are utterly dependent on
    > > GPS at this point, and would have a tough time remembering how to use the
    > > sextant if it came down to that point. �It will only get worse when the
    > > younger generations take command, having never known a time without GPS.
    >
    > > JCA
    >
    > > --
    > > NavList message boards:www.fer3.com/arc
    > > Or post by email to: NavList@fer3.com
    > > To unsubscribe, email NavList+unsubscribe@fer3.com
    >
    >
    
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