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Radar Repair
Does anyone no any good books on marine radar repair?
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In article
, "M.F." wrote: Does anyone no any good books on marine radar repair? Unless you hold a valid General Radiotelephone Operators License with Radar Endorsement, you are not allowed under US Law, to work on Commercial Marine Radar Equipment. Me who has one of those......... |
On 2005-02-13 06:54:56 +1100, Me said:
In article , "M.F." wrote: Does anyone no any good books on marine radar repair? Unless you hold a valid General Radiotelephone Operators License with Radar Endorsement, you a Not everyone lives in the USA mate! I would be interested in seeing what is out there too. -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall |
In article 2005021307093975249%lost@nowhereorg,
John Proctor wrote: Not everyone lives in the USA mate! I would be interested in seeing what is out there too. -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall That is true, but if you looked at the Headers of the OP, you would notice that the OP DOES live in the US, "Mate"..... Me |
On 2005-02-14 05:13:42 +1100, Me said:
In article 2005021307093975249%lost@nowhereorg, John Proctor wrote: Not everyone lives in the USA mate! I would be interested in seeing what is out there too. -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall That is true, but if you looked at the Headers of the OP, you would notice that the OP DOES live in the US, "Mate"..... Me And the question still stands for those interested in acquiring some knowledge. Are there any good books on Radar technology operation/repair? BTW mate is a bloody good Aussie word meaning friend! So don't take offence. -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall |
Me wrote: In article , "M.F." wrote: Does anyone no any good books on marine radar repair? Unless you hold a valid General Radiotelephone Operators License with Radar Endorsement, you are not allowed under US Law, to work on Commercial Marine Radar Equipment. Me who has one of those......... I have a GROL with a radar endorsement and would still like to find a good book on modern radar repair. The FCC test is based on vacuum tube technology that hasn't been used since the 70's |
In article ,
halibutslayer wrote: I have a GROL with a radar endorsement and would still like to find a good book on modern radar repair. The FCC test is based on vacuum tube technology that hasn't been used since the 70's True enough. Most of the technical stuff involved in maintaince of modern Maritime Radars would be in the OEM's Operations and Maintainance Manuals and 99% of the Qualified Tech's in the field gained their current knowledge via OJT, and not from books that would be obsolete before they gained an circulation. The basics of Radar Technology was worked out at MIT in the late 30's after trading the British Magnitron Prototype for all those Lend - Lease Destroyers. Bruce in alaska who also has one of those things on the wall...... -- add a 2 before @ |
"Bruce in Alaska" wrote in message ... In article , halibutslayer wrote: I have a GROL with a radar endorsement and would still like to find a good book on modern radar repair. The FCC test is based on vacuum tube technology that hasn't been used since the 70's True enough. Most of the technical stuff involved in maintaince of modern Maritime Radars would be in the OEM's Operations and Maintainance Manuals and 99% of the Qualified Tech's in the field gained their current knowledge via OJT, and not from books that would be obsolete before they gained an circulation. The basics of Radar Technology was worked out at MIT in the late 30's after trading the British Magnitron Prototype for all those Lend - Lease Destroyers. Bruce in alaska who also has one of those things on the wall...... -- add a 2 before @ I also would be interested in what current books or in depth magazine articles are out there. The days of servos and synchros, long wave guide runs full of water, etc., are long gone, as are vacuum tubes (except for maggies). I work on radars quite a bit and a good service manual for the unit is invaluable, as is a spare magnetron and a spare MIC. Substituting those one at a time solves the majority of the problems, along with motor replacement and bad modulator or signal processor circuit assemblies. The modulator FETS and the power supply FETs fail quite a bit also. And of course, water damage problems are usually the result of poor installation or exposed locations. Although I have seen Raymarine equipment corroded, the problem is always poor installation. The other brands are just as likely to come in encrusted with salt, etc. The guys who insist on mounting the all around light in the lid of a radome are just setting themselves up for water damage later on. A cheap test instrument for radar transmission is one of those under $ 10 microwave oven leakage meters. Of course, the old neon bulb on a wooden dowel still works also. Doug K7ABX |
"Bruce in Alaska" wrote in message ... In article , halibutslayer wrote: True enough. Most of the technical stuff involved in maintaince of modern Maritime Radars would be in the OEM's Operations and Maintainance Manuals and 99% of the Qualified Tech's in the field gained their current knowledge via OJT, and not from books that would be obsolete before they gained an circulation. The basics of Radar Technology was worked out at MIT in the late 30's after trading the British Magnitron Prototype for all those Lend - Lease Destroyers. Bruce in alaska who also has one of those things on the wall...... -- add a 2 before @ That triggered a nostalgic moment Bruce, I recall reading the entire series of the MIT Radiation Lab textbooks published at the end of WWII. The books had quite a bit of dust on them in my college library when I found them in the early 60s. It turned out one of my school's physics professors (actually vice president of the college by then) had written one of them. I think we more that got our money's worth in the lend-lease trade for the technology transfer/catalyst from the UK. Doug K7ABX |
"Doug" wrote in
nk.net: Although I have seen Raymarine equipment corroded, the problem is always poor installation. The other brands are just as likely to come in encrusted with salt, etc. The guys who insist on mounting the all around light in the lid of a radome are just setting themselves up for water damage later on. A cheap test instrument for radar transmission is one of those under $ 10 microwave oven leakage meters. Of course, the old neon bulb on a wooden dowel still works also. Doug K7ABX Naw....Just sit a Raymarine out in a humid environment with its little rubber drain tube breathing in and out as the sun rises and sets and it soon fills with condensate water, destroying the pot metal the cheap POS is made from. This new unit we got has 4 white plastic "feet" to hold the radome up off the mounting plate. There's no sealing it, now, but that didn't make any difference anyways. The mounting bolts go through the hole in the center of the plastic feet which space the dome about 1/2" off the mount, now. I don't see that's going to solve the condensate problem, though. It rains inside the dome through the drain tube, just like a half-empty gas tank gets condensate water in it, left that way in the sun. It's NOT a Raytheon, any more. |
Larry,
Did you read the info on the link? The first radar system was the British Chain Home (CH) that operated on 20 Mhz. My frequency chart lists that as HF. krj Larry W4CSC wrote: Bruce in Alaska wrote in news:bruceg- : gained an circulation. The basics of Radar Technology was worked out at MIT in the late 30's after trading the British Magnitron Prototype for all those Lend - Lease Destroyers. Bruce in alaska who also has one of those things on the wall...... Huh?? The first radars were on VHF! They operated on common vacuum tubes, not microwave magnetrons. http://www.bbc.co.uk/dna/ww2/A591545 |
In article et,
"Doug" wrote: Of course, the old neon bulb on a wooden dowel still works also. Doug K7ABX You actually use a wooden dowel? I just put the NE2's on a string, and hang it in front of the Waveguide flange, about an inch or two. Bruce in alaska How well does an NE2 work on a 2Kw Tx these days? -- add a 2 before @ |
krj wrote in
: Larry, Did you read the info on the link? The first radar system was the British Chain Home (CH) that operated on 20 Mhz. My frequency chart lists that as HF. krj 'Scuze me! In 1930, 20 Mhz was UHF, not VHF....(c; Way back there, someplace, the genius engineers declared anything above 2 Mhz was useless, so they gave all freqs above 2 Mhz to us ham radio operators. The sleazy *******s been stealin it back from us ever since! NNNN AR |
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In article ,
Larry W4CSC wrote: Bruce in Alaska wrote in news:bruceg- : Bruce in alaska How well does an NE2 work on a 2Kw Tx these days? Hmm...Might be fun to stick a few NE2s to the outside of the dome on the new Raymarine 2KW we're about to put up. Then, you might be able to tell it its really on the air. Great idea, Bruce.... Hope, by the time the RF goes thru the waveguide, rotory joint, and is dispersed across that little Panel Antenna, the Power Density of the transmitter pulse will not be sufficent to cause an NE2 to ionize. It was a good guess however...... Bruce in alaska -- add a 2 before @ |
"M.F." wrote: Does anyone no any good books on marine radar repair? I guess not. |
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