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#11
posted to rec.boats.electronics
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Furuno Radar Problem
In article ,
"Lynn Coffelt" wrote: Oh, for gosh sakes, I thought as an "Old Timer", I'd seen or heard of everything! I've never seen that bearing froze up! Thanks for reporting back. Old Chief Lynn That really makes no sense Lynn. If the Bearing was froze, the antenna wouldn't Rotate, and it wuld be evident externally. Now if the Rotory Joint was froze, the Alignment Keeper on the top of the T/R Pan, would have to be missing, or broken to allow for the miss-alignment of the two Flanges. It should only give a very narrow widow of passable RF. Just a couple of degrees, plus or minus, at each correct alignment. If the later, is the case, then I am with you, very strange occurance, indeed..... Bruce in alaska that would be one for the Books....... "Sun Dragon" wrote in message ... Thanks for the replies, I took the scanner unit apart and found the problem to be the waveguide coupling bearing was siezed up. Because the waveguide is rectangular in shape and oriented with the long dimension fore and aft produced the target display problem of not seeing targets port and stbd! thanks again. "Sun Dragon" wrote in message ... I have a small Furuno radar where the echo return image is missing on the left and right portion of the screen. The fore and aft images are fine. I suspect the "brushes" or slip rings in the scanner unit are worn in the 2 o clock thru 4 o clock and the 8 o clock thru 10 o clock regions. Am i correct in this assumption and if so, are kits available to renew the contacts in the scanner? Thanks, Capt J. Vincent Collins Master Oceans F/V Sun Dragon -- add a 2 before @ |
#12
posted to rec.boats.electronics
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Furuno Radar Problem
"Bruce in Alaska" wrote in message ... In article , "Lynn Coffelt" wrote: Oh, for gosh sakes, I thought as an "Old Timer", I'd seen or heard of everything! I've never seen that bearing froze up! Thanks for reporting back. Old Chief Lynn That really makes no sense Lynn. If the Bearing was froze, the antenna wouldn't Rotate, and it wuld be evident externally. Now if the Rotory Joint was froze, the Alignment Keeper on the top of the T/R Pan, would have to be missing, or broken to allow for the miss-alignment of the two Flanges. It should only give a very narrow widow of passable RF. Just a couple of degrees, plus or minus, at each correct alignment. If the later, is the case, then I am with you, very strange occurance, indeed..... Bruce in alaska that would be one for the Books....... Yup, once in a while the scanner bearing seal or water in the motor housing would let the scanner main bearing get corroded or filled with gunky stuff, but never saw the rotating joint freeze up! I have, a couple of times, managed to successfully break, bend or otherwise defeat the waveguide alignment scheme. Targets were not all that lively, and wiped out the crystals in fairly short order. Probably didn't do the maggie too much good either. Head hanging in shame. Again. Old Chief Lynn |
#13
posted to rec.boats.electronics
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Furuno Radar Problem
Lynn Coffelt wrote:
"Bruce in Alaska" wrote in message ... In article , "Lynn Coffelt" wrote: Oh, for gosh sakes, I thought as an "Old Timer", I'd seen or heard of everything! I've never seen that bearing froze up! Thanks for reporting back. Old Chief Lynn That really makes no sense Lynn. If the Bearing was froze, the antenna wouldn't Rotate, and it wuld be evident externally. Now if the Rotory Joint was froze, the Alignment Keeper on the top of the T/R Pan, would have to be missing, or broken to allow for the miss-alignment of the two Flanges. It should only give a very narrow widow of passable RF. Just a couple of degrees, plus or minus, at each correct alignment. If the later, is the case, then I am with you, very strange occurance, indeed..... Bruce in alaska that would be one for the Books....... Yup, once in a while the scanner bearing seal or water in the motor housing would let the scanner main bearing get corroded or filled with gunky stuff, but never saw the rotating joint freeze up! I have, a couple of times, managed to successfully break, bend or otherwise defeat the waveguide alignment scheme. Targets were not all that lively, and wiped out the crystals in fairly short order. Probably didn't do the maggie too much good either. Head hanging in shame. Again. Old Chief Lynn That's what you get when you don't use a good brand of relative bearing grease! g |
#14
posted to rec.boats.electronics
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Furuno Radar Problem
In article ,
"Lynn Coffelt" wrote: "Bruce in Alaska" wrote in message ... In article , "Lynn Coffelt" wrote: Oh, for gosh sakes, I thought as an "Old Timer", I'd seen or heard of everything! I've never seen that bearing froze up! Thanks for reporting back. Old Chief Lynn That really makes no sense Lynn. If the Bearing was froze, the antenna wouldn't Rotate, and it wuld be evident externally. Now if the Rotory Joint was froze, the Alignment Keeper on the top of the T/R Pan, would have to be missing, or broken to allow for the miss-alignment of the two Flanges. It should only give a very narrow widow of passable RF. Just a couple of degrees, plus or minus, at each correct alignment. If the later, is the case, then I am with you, very strange occurance, indeed..... Bruce in alaska that would be one for the Books....... Yup, once in a while the scanner bearing seal or water in the motor housing would let the scanner main bearing get corroded or filled with gunky stuff, but never saw the rotating joint freeze up! I have, a couple of times, managed to successfully break, bend or otherwise defeat the waveguide alignment scheme. Targets were not all that lively, and wiped out the crystals in fairly short order. Probably didn't do the maggie too much good either. Head hanging in shame. Again. Old Chief Lynn No shame required, I amagine that it just wasn't totally thought thru... and I actually went over and looked it up in the Service Manual..... Bruce in alaska -- add a 2 before @ |
#15
posted to rec.boats.electronics
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Furuno Radar Problem
.. Yup, once in a while the scanner bearing seal or water in the
motor housing would let the scanner main bearing get corroded or filled with gunky stuff, but never saw the rotating joint freeze up! I have, a couple of times, managed to successfully break, bend or otherwise defeat the waveguide alignment scheme. Targets were not all that lively, and wiped out the crystals in fairly short order. Probably didn't do the maggie too much good either. Head hanging in shame. Again. Old Chief Lynn That's what you get when you don't use a good brand of relative bearing grease! g Good grief, is that something made from aunts or cousins?.......... ducking............... OCL |
#16
posted to rec.boats.electronics
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Furuno Radar Problem
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#18
posted to rec.boats.electronics
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Furuno Radar Problem
"Sun Dragon" wrote in
: A roll of aluminum foil and a "green" deckhand made for good humor, I would instruct the deckhand to wrap himself in foil, stand upon the foredeck, as we would command him to hold himself in rather odd body positions while the chief and myself up in the wheelhouse "tuned" the radar. If possible we would do this in port, prefferably so the crews of other vessels could be witness to the charade. The tinfoil hat was always the crowd pleaser. Darn. I never saw that trick.....(c; Thanks. Bored to tears crossing the Atlantic for Naples at our breakneck speed of 17 knots, some of the boys in the DASH helo hanger got the bright idea to screw with the CIC watch (an oxymoron in a tender with 2 3" cannons the gummer's mates have to break out the manual to fire). They built a tin foil kite out of Reynolds Wrap stolen from the galley, a really nice box kite with fiberglass spars. The DASH helo deck was above our fantail and a great place at sea to fly kites, which up to this point was no problem. They had about 3 miles of some exotic monofilament line with an amazing tensile strength, but little weight/mile. After darken ship (why we did that was always a mystery), when you couldn't see it, they flew the kite behind Everglades and payed out lots of this tiny line. The kite was quite large and had a lot of lift. It would fly back until you could hardly see it, its line seemingly trailing off to nowhere. Flying above the fantail watch, who was looking at the horizon, not for the Luftwaffe above, he reported nothing. Not so the radar operator in CIC. He sounded the alarm of a UFO trailing the ship on the Raytheon Pathfinder (SPS-21) display at about 2 miles. The watch reported no sighting as the kite was too far away by the time he looked for it. The ship's log was duly noted and everyone aboard, mostly the enlisted ratings who knew all about what was going on, was told to keep a sharp eye. Every night, for over a week, this "thing" would show up on radar in the dark and trail the ship for hours...Then, just after midnight, it would approach the ship and disappear, suddenly, off the radar less than a mile away, undetectable. Finally discovered what it was by the Comm Officer who observed its launch from the deck outside Radio Central one night, the jig was up. The airdales on the helo deck apologized and said they'd been flying many kites. This one was just new. They pleaded innocent, which they weren't. Our captain decided it was a great test of CIC efficiency, an unintended drill of great success. The kite continued to fly, but with a new Saran Wrap covering that was radar transparent, compliments of the Chief Radarman and cooks....(c; Larry -- VIRUS ALERT! VISTA has been released! NOONE will be spared! |
#19
posted to rec.boats.electronics
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Furuno Radar Problem
snip
Our SPS-6 aboard USS Everglades (AD-24)... Sea stories? Oh boy! Now this one is a no ****ter. In 1965, up on one of the westernmost islands in the Aleutian chain, we used to send guys outside with a compass, a pair of binoculars, and a notepad, to watch for the Russians making overflights. They were told the aircraft would be either GU11's or B1RD's and to note the number of aircraft in the flight, relative bearing, and approximate distance. Sometimes we'd use two guys and one of them would be a runner to bring the reports back in where they were plotted and tracked on a map. Jack -- Jack Erbes in Ellsworth, Maine, USA (jackerbes at adelphia dot net) (also receiving email at jacker at midmaine dot com) |
#20
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Furuno Radar Problem
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