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furuno radar question

Old 10-08-2011, 08:17 PM
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Talking furuno radar question

finished installing my furuno 1623 radar and went out to the chesapeak bay to " practice "when the radar is on now and then a broken line resembling the elb line will shoot out from the center(own ship) as furuno calls it of the screen stay for a split second then disapear. i have read and reread the owners manule but can not come up with what is causeing it .any thoughts--thanks in advance for any any info.
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Old 10-09-2011, 12:54 PM
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Sounds like interference on first blush
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Old 10-09-2011, 01:38 PM
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Could a "morse code" bouy. Also known as RACON - Radar Transponder Beacon. It shows the morse identification letter. (on your radar screen, as dashes, long, short etc...)

Refer to Chart #1, section S, 3.1 and 3.6.

Look on your chart and see if you were near a RACON buoy. There is at least one near where I fish on the Chesapeake.


I have the same Radar unit. Simple yet effective :-)

I love this stuff.

Dave
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Old 10-09-2011, 01:56 PM
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Originally Posted by dpowell View Post
Could a "morse code" bouy. Also known as RACON - Radar Transponder Beacon. It shows the morse identification letter. (on your radar screen, as dashes, long, short etc...)

Refer to Chart #1, section S, 3.1 and 3.6.

Look on your chart and see if you were near a RACON buoy. There is at least one near where I fish on the Chesapeake.


I have the same Radar unit. Simple yet effective :-)

I love this stuff.

Dave
might have been just that--how long have you had your unit-
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Old 10-09-2011, 03:04 PM
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About three years or so. Has always worked great. Good luck with yours, as the saying goes, practice makes perfect.

Dave
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Old 10-11-2011, 07:50 PM
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Talking radar

Originally Posted by dpowell View Post
About three years or so. Has always worked great. Good luck with yours, as the saying goes, practice makes perfect.

Dave
went out overnight ran acouple of bouy lines during the day, then did it at night changing the range rings-and the setting to see how it will look. gaining confidence the more times you go out.
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Old 10-12-2011, 09:49 AM
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Yep, you are doing it the right way in my opinion. Got to use your radar during the day and note the "radar shadows" as they appear - like along the shore line. Fun to see how bridges look and how large some targets appear even if they are actually quite small. You've noticed how some cans have radar reflectors at the top etc... Play with the gain and the distance rings like you are. I'll see a faint target broad on the starboard side, disappear and reappear and eventually will see a sportfishermen hauling ass going in the same direction... Pretty cool. The 1623 has a lot of nice features.

You'll be safer at night or limited visibility when you have a good working knowledge of your radar.

Dave :-)
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Old 10-13-2011, 08:33 AM
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Originally Posted by dpowell View Post
Yep, you are doing it the right way in my opinion. Got to use your radar during the day and note the "radar shadows" as they appear - like along the shore line. Fun to see how bridges look and how large some targets appear even if they are actually quite small. You've noticed how some cans have radar reflectors at the top etc... Play with the gain and the distance rings like you are. I'll see a faint target broad on the starboard side, disappear and reappear and eventually will see a sportfishermen hauling ass going in the same direction... Pretty cool. The 1623 has a lot of nice features.

You'll be safer at night or limited visibility when you have a good working knowledge of your radar.

Dave :-)
couple of questions-(1) what makes a target weak-the distance from the dome? why do targets disapear then reapear.the furuno teck said unless its raining or your in fog leave the rain cullter control off.as it will mask targets-any exeperience with this
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Old 10-13-2011, 10:15 AM
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Rain clutter and sea clutter functions tend to adjust the gain and the threshold for detection of a target up or down depending on the amount of "crud" in the neighborhood of the target. Leaving those features off may cause you to see a target better, but they may also cause you to see a target that isn't there.

The apparent size of a target (power returned from a target) drops off with range (assuming you are comparing all targets of the same physical size) fairly dramatically (4th power of range).
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Old 10-13-2011, 01:12 PM
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Originally Posted by capecuddy View Post
Rain clutter and sea clutter functions tend to adjust the gain and the threshold for detection of a target up or down depending on the amount of "crud" in the neighborhood of the target. Leaving those features off may cause you to see a target better, but they may also cause you to see a target that isn't there.

The apparent size of a target (power returned from a target) drops off with range (assuming you are comparing all targets of the same physical size) fairly dramatically (4th power of range).
how would that be possible? if it is not there-there would be nothing to reflect off of -speaking of sea clutter the manule usees the terms windward and leeward. explain please is windward the direction the wind is coming from or goining to.thanks for all info.
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Old 10-13-2011, 01:49 PM
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The reflection is off the tops of the local wave action in the case of false targets.

A false target is a radar return that's not a boat or marker or dock or something you're wanting/expecting to see. Sea clutter, rain clutter, interference, land clutter can all potentially make your radar see "crud" and give you the impression it's a target.

On the opposite hand, when your radar has concluded it is seeing "crud" , it has tendency to de-sensitize the radar in the vicinity of the crud and hide or mask a real target, interpreting the real target as clutter.

This is a complicated subject....I'm trying to keep my explanation straightforward without diving into technical details.
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Old 10-13-2011, 02:14 PM
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Windward is the direction the wind is coming from, leeward is wind going away. To windward the waves are being pushed toward you and the faces are steeper allowing more radar reflection. While the waves going away are "usually" more rounded by the nature of the wave itself.

Not to be confused with currents. A northernly wind is coming from the north, while a northernly current is going to the north... Oops but I digress... Lol.

Anyway, the sportfishermen boat I refered to earlier was at a certain distance that would plunge down a wave being obscured then reappear on radar as it came back up on a swell. the sea state will also obscure targets as will rain etc... That's why for me personally I don't use the "auto" settings very often. Just adjust the gain so a little clutter shows then back it off a tad. You want to see the tug boat but you also want to avoid running over the guy in the rowboat with no running lights.

Hope this helps you.

Dave

Try Radar for Mariners by David Burch includes a CD with a simulator program.
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Old 10-13-2011, 07:29 PM
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Originally Posted by dpowell View Post
Windward is the direction the wind is coming from, leeward is wind going away. To windward the waves are being pushed toward you and the faces are steeper allowing more radar reflection. While the waves going away are "usually" more rounded by the nature of the wave itself.

Not to be confused with currents. A northernly wind is coming from the north, while a northernly current is going to the north... Oops but I digress... Lol.

Anyway, the sportfishermen boat I refered to earlier was at a certain distance that would plunge down a wave being obscured then reappear on radar as it came back up on a swell. the sea state will also obscure targets as will rain etc... That's why for me personally I don't use the "auto" settings very often. Just adjust the gain so a little clutter shows then back it off a tad. You want to see the tug boat but you also want to avoid running over the guy in the rowboat with no running lights.

Hope this helps you.


Try Radar for Mariners by David Burch includes a CD with a simulator program.
can i go on line to get the cd and yes it all has helped -the more i can understand the better i will be able to use the radar
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Old 10-13-2011, 10:47 PM
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Trophyone, not sure about the CD.

Try Amazon.com

Good luck
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Old 10-15-2011, 07:56 PM
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Originally Posted by dpowell View Post
Trophyone, not sure about the CD.

Try Amazon.com

Good luck
found it on amazon it is on the way---thanks
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Old 10-18-2011, 05:26 PM
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trophyone -
Furuno also has a radar guide book on their web site, I think it was under the learning section. If you can't find it, I'm sure you can go on their forum and ask for a link. Here's their forum page: http://www.furunousa.com/Support/Forum.aspx

Good luck!
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