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Koden MD-3600 Radar
Group,
I've started back into marine electronics fitting and repair again. We have an older scanner MRT-136) that is part of an MD-3600 radar system. The radome got wet (yes Larry other manufacturers do get wet from time to time). The owner want's us to have a look at it but the local Koden distributor doesn't have any manuals going that far back. Does anyone have a service manual or know of where I can find one for the scanner? -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall |
In article 2005072120424116807%lost@nowhereorg,
John Proctor wrote: Group, I've started back into marine electronics fitting and repair again. We have an older scanner MRT-136) that is part of an MD-3600 radar system. The radome got wet (yes Larry other manufacturers do get wet from time to time). The owner want's us to have a look at it but the local Koden distributor doesn't have any manuals going that far back. Does anyone have a service manual or know of where I can find one for the scanner? If you have some experience with small commercial xband marine radars you shouldn't need a manual to figure out what quit in the T/R Pan on a Koden Radar. They are very similar in design to the JRC, as well as the Furuno's of the same period. Take a scope and look for the TRansmitter Trigger Pulses coming up the line from the display, and follow them thru to the Modulator Switcher, and then check the RF output of the Magnitron with an NE2 neon bulb. For receive, just see if you have noise comming down the video coax from the IF amp, and monitor, either the Crystal Current, or if this has a LNB, put your scope on the output of the LNB and look for pulses and grass in between the pulses. Most of the old hands have an Xband RF Test Box that can simulate Xband RF Target Returns, to the antenna port, as well as minitor the RF output from the cirulator. Having the right test equipment is essential in working in the Marine Electronics Field..... Bruce in alaska -- add a 2 before @ |
Having the right test equipment is essential in working in
the Marine Electronics Field..... Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) |
In article ,
"Lynn Coffelt" wrote: Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) What, you taped yours to a diddle stick??? We always just held them in our fingers out in front of the waveguide flange..... Well not on 40Kw Decca 404's.... but all the rest..... Hmmm, sounds like an old timer....The really good techs came from Northern Radio, Radar Electric, and Raytheon Marine back in the 60's and 70's. I am an old Northern Man, and one of the few "Old Boys" left. Don Hollingsworth Sr. is still around at G & L Marine, and he is a Raytheon transplant. Billy Pulse came from the end of the era Radar Electric shop. That's about it for that generation, that still practice the "Art" of Marine Electronics. Same with the "Regulators". (FCC) After the closing of RegionX in Kirkland, there just isn't anyone left that really understands the Marine Mobile Radio Service. Bob Dietch, Bob Zenes, Gary Solsby, Bill Johnson, and even Denny Anderson have all retired. Me getting old is a Bitch......all the good guys just die off.... |
"Lynn Coffelt" wrote in message ... Having the right test equipment is essential in working in the Marine Electronics Field..... Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) I learned it with two fingers and the length/color of the arc. Old Senior Chief Doug |
No luck on that model Koden here, had some 3400 series stuff though. Try a
Sitex shop...they may have the Koden info. Speaking of Bill Pulse...he bought up at the EchoTec remnants, drawings, parts, etc., and now does flat rate repair on them from his firm Radar Marine in Bellingham, WA. Did you ever know Bill Halleck, Portland FCC Engineer in Charge? He retired in the late 50s or early 60s. Doug K7ABX "Me" wrote in message ... In article , "Lynn Coffelt" wrote: Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) What, you taped yours to a diddle stick??? We always just held them in our fingers out in front of the waveguide flange..... Well not on 40Kw Decca 404's.... but all the rest..... Hmmm, sounds like an old timer....The really good techs came from Northern Radio, Radar Electric, and Raytheon Marine back in the 60's and 70's. I am an old Northern Man, and one of the few "Old Boys" left. Don Hollingsworth Sr. is still around at G & L Marine, and he is a Raytheon transplant. Billy Pulse came from the end of the era Radar Electric shop. That's about it for that generation, that still practice the "Art" of Marine Electronics. Same with the "Regulators". (FCC) After the closing of RegionX in Kirkland, there just isn't anyone left that really understands the Marine Mobile Radio Service. Bob Dietch, Bob Zenes, Gary Solsby, Bill Johnson, and even Denny Anderson have all retired. Me getting old is a Bitch......all the good guys just die off.... |
"Doug" wrote in message ink.net... "Lynn Coffelt" wrote in message ... Having the right test equipment is essential in working in the Marine Electronics Field..... Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) I learned it with two fingers and the length/color of the arc. Old Senior Chief Doug Oh, Wow! Doug, that technique was never taught at this outpost. But studying, with crossed eyes, the arc reaching the tip of one's nose was instructional. Jerry Writer told me that you could count the number of "real" radar techs on the West Coast on the fingers of one hand. Jim Manwaring was one of them, were you one of the others? Old Chief Lynn |
"Doug" wrote in message ink.net... "Lynn Coffelt" wrote in message ... Having the right test equipment is essential in working in the Marine Electronics Field..... Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years) I learned it with two fingers and the length/color of the arc. Old Senior Chief Doug I saw the results of a MARS operator closing a TR relay in a Henry linear one time using his fingers. Looked like a bbq hotdog. +1 on the Simpson 260, digital meters don't see everything. Andy (aging ETC Ret) |
In article . net,
"Doug" wrote: Did you ever know Bill Halleck, Portland FCC Engineer in Charge? He retired in the late 50s or early 60s. Doug K7ABX Nope, a bit before my time, for that far away from Seattle.... There was a Peter Baliogen, and one other fellow, who's name escapes me, that were RegionX guys from that era, but I only new one or two of the Portland guys, and I can't really recall any of their names right off.. Used to do a pile of SALAS Inspections with those guys every year, back before Self Regulation came into being.... I still do a few for the Small Passenger Ships that cruise around up here..... Me who does reminis in his old age.... |
"Lynn Coffelt" wrote in message ... Oh, Wow! Doug, that technique was never taught at this outpost. But studying, with crossed eyes, the arc reaching the tip of one's nose was instructional. Jerry Writer told me that you could count the number of "real" radar techs on the West Coast on the fingers of one hand. Jim Manwaring was one of them, were you one of the others? Old Chief Lynn Nope, not me. I did a small amount of radar and HF AM work in the late 50s, early 60s on the Oregon coast, and then spent 20 years in the US Navy, retiring as a CTMCS. Did some part time marine work when I was stationed in the Aleutians in 70-72 and in Maine 76-84. I have only been into it full time for about 4 years now, after high tech manufacturing crashed in this area. Had an installer come begging for a digital VOM the other day as his went "over the side". I handed him a Simpson 260. He looked puzzled and asked what that antique does. He was Air Force trained, so guess that explains it. He declined my offer as it was "too complex". 73 Doug K7ABX |
Oh, Wow! Doug, that technique was never taught at this outpost. But
studying, with crossed eyes, the arc reaching the tip of one's nose was instructional. Nope, not me. I did a small amount of radar and HF AM work in the late 50s, early 60s on the Oregon coast, and then spent 20 years in the US Navy, retiring as a CTMCS. Did some part time marine work when I was stationed in the Aleutians in 70-72 and in Maine 76-84. I have only been into it full time for about 4 years now, after high tech manufacturing crashed in this area. Had an installer come begging for a digital VOM the other day as his went "over the side". I handed him a Simpson 260. He looked puzzled and asked what that antique does. He was Air Force trained, so guess that explains it. He declined my offer as it was "too complex". Our main troubleshooting instrument when I was a young mechanic in the Air Force was the PSM-6. (early '50s to late '70s). In a second life, after Air Force, Jerry Hamilton, my marine electronics mentor at Whatcom Marine Electronics in Anacortes wouldn't allow a digital VOM in the shop. He fired one tech who was addicted to digital and wouldn't do field work without a scope. (we only had one scope, and it was sorely needed at the swamped repair bench) Old Chief Lynn, W7LTQ (ex-Aircraft Maintenance Superintendent) |
In article ,
"Lynn Coffelt" wrote: Our main troubleshooting instrument when I was a young mechanic in the Air Force was the PSM-6. (early '50s to late '70s). In a second life, after Air Force, Jerry Hamilton, my marine electronics mentor at Whatcom Marine Electronics in Anacortes wouldn't allow a digital VOM in the shop. He fired one tech who was addicted to digital and wouldn't do field work without a scope. (we only had one scope, and it was sorely needed at the swamped repair bench) Old Chief Lynn, W7LTQ (ex-Aircraft Maintenance Superintendent) Now there is a name I haven't heard in a few years, (Decades).... How is old Jerry (Hamilton) do'in these days? I haven't heard of Whatcom Marine Electronics for a while either, and figured Billy "Radar" Pulse had stolen all their business, and they had folded. If you see Jerry these days, tell him "Hello" from Bruce Gordon... Bruce in alaska -- add a 2 before @ |
Now there is a name I haven't heard in a few years, (Decades)....
How is old Jerry (Hamilton) do'in these days? I haven't heard of Whatcom Marine Electronics for a while either, and figured Billy "Radar" Pulse had stolen all their business, and they had folded. If you see Jerry these days, tell him "Hello" from Bruce Gordon... Bruce in alaska Jerry Hamilton left me running the Anacortes shop for Whatcom Marine Electronics in mid 1978, and went to Ketchekan to try to start a Whatcom shop there. I haven't had much personal contact with him since. He was a straight arrow guy with lots of pressures. I, too would like to hear from him. He helped me a lot, and I never had a chance to thank him. Whatcom Marine Electronics made a big expansion into Nordic Marine Electronics with shops and seasonal service reps in several locations. When the king crab boom started to flounder and Bristol Bay took a dive, I got some help from several people to separate from them and become Anacortes Marine Electronics. Which is still plugging away without me. Jerry Writer, one of the two original owners of Whatcom Marine Electronics, owns and operates San Juan Electronics. Doing quite well, and surviving a stone's throw from Bill Pulse's empire in Bellingham. Me, a "Johnny Come Lately" turned "Has-been". Lynn, W7LTQ, Once Radiotelephone First! (now general......grrrr) |
In article ,
"Lynn Coffelt" wrote: Now there is a name I haven't heard in a few years, (Decades).... How is old Jerry (Hamilton) do'in these days? I haven't heard of Whatcom Marine Electronics for a while either, and figured Billy "Radar" Pulse had stolen all their business, and they had folded. If you see Jerry these days, tell him "Hello" from Bruce Gordon... Bruce in alaska Jerry Hamilton left me running the Anacortes shop for Whatcom Marine Electronics in mid 1978, and went to Ketchekan to try to start a Whatcom shop there. I haven't had much personal contact with him since. He was a straight arrow guy with lots of pressures. I, too would like to hear from him. He helped me a lot, and I never had a chance to thank him. Whatcom Marine Electronics made a big expansion into Nordic Marine Electronics with shops and seasonal service reps in several locations. When the king crab boom started to flounder and Bristol Bay took a dive, I got some help from several people to separate from them and become Anacortes Marine Electronics. Which is still plugging away without me. Jerry Writer, one of the two original owners of Whatcom Marine Electronics, owns and operates San Juan Electronics. Doing quite well, and surviving a stone's throw from Bill Pulse's empire in Bellingham. Me, a "Johnny Come Lately" turned "Has-been". Lynn, W7LTQ, Once Radiotelephone First! (now general......grrrr) Oh, don't give "Me" a hard time, He has been around the industry longer than I have. I used to work with him over at Northern Radio back in the early 70's. He was an excellent tech and Poineered, a lot of the Point to Point VHF Paths that are still in use up in Bristol Bay, between the villages, and Naknek/King Salmon. Bruce in alaska one of the few with an Aircraft Endosement on his ticket....... -- add a 2 before @ |
Bruce in alaska one of the few with an Aircraft Endosement on
his ticket....... I always coveted an Aircraft Endorsement, but after I got the Radar Endorsement, work and feeding four hungry mouths sort of saturated all the time that existed. Northern was always King, I guess, I admired the company, and even did a couple of quick contract jobs for them. When I needed another load of Morad antennas, I was too cheap to have them delivered, so Morad would put them under Northern's dumpsters at close of day, and I'd drive down after work and pick them up. What impressed me more than anything was that they had "business" hours. A concept completely foreign to Anacortes. Lynn, W7LTQ |
"Lynn Coffelt" wrote in message ... Bruce in alaska one of the few with an Aircraft Endosement on his ticket....... I always coveted an Aircraft Endorsement, but after I got the Radar Endorsement, work and feeding four hungry mouths sort of saturated all the time that existed. Northern was always King, I guess, I admired the company, and even did a couple of quick contract jobs for them. When I needed another load of Morad antennas, I was too cheap to have them delivered, so Morad would put them under Northern's dumpsters at close of day, and I'd drive down after work and pick them up. What impressed me more than anything was that they had "business" hours. A concept completely foreign to Anacortes. Lynn, W7LTQ Speaking of Aircraft endorsement, I watched an old John Wayne movie "Island in the Sky" last week on TV (an Ernie Gahn book). The radio op was running what appeared to be a BC348 receiver, and an ART-13 transmitter with a bug. It was in a WWII C-47 (DC-3) plane. Did Northern ever make military receivers? I remember a Northern Electric or Northern Radio version of the Hammurlund SP-600 that I worked on back in the late 60s. I thought it was a Canadian firm that made them under a NATO contract. However, one Navy guy from the pacific NW said they were made in Seattle. Speaking of business hours...I remember a coax distributor in Portland who would hide rolls of coax under his shipping dock so they could be picked up in the early AM on the way to work at the old Portland Radio Supply. You don't get that kind of deal anymore. 73 Doug K7ABX |
In article ,
"Lynn Coffelt" wrote: Bruce in alaska one of the few with an Aircraft Endosement on his ticket....... I always coveted an Aircraft Endorsement, but after I got the Radar Endorsement, work and feeding four hungry mouths sort of saturated all the time that existed. Northern was always King, I guess, I admired the company, and even did a couple of quick contract jobs for them. When I needed another load of Morad antennas, I was too cheap to have them delivered, so Morad would put them under Northern's dumpsters at close of day, and I'd drive down after work and pick them up. What impressed me more than anything was that they had "business" hours. A concept completely foreign to Anacortes. Lynn, W7LTQ Yep, I worked for Dennis, and Chuck (the Yellow page salesman) for a few years after they bought out Northern Marine Electronics, from Northen Radio as the Service Department. Smoke O'kelly was still at NME, when I left but Lou Navarre had already gone by then.Had a very good relationship with Eddie Zanbergen over at Morad as well, before he died. Still use Morad stuff alot up here. Very good stuff for band weather. Ahhhhh, "the Good Old Days"...... Bruce in alaska -- add a 2 before @ |
In article . net,
"Doug" wrote: "Lynn Coffelt" wrote in message ... Bruce in alaska one of the few with an Aircraft Endosement on his ticket....... I always coveted an Aircraft Endorsement, but after I got the Radar Endorsement, work and feeding four hungry mouths sort of saturated all the time that existed. Northern was always King, I guess, I admired the company, and even did a couple of quick contract jobs for them. When I needed another load of Morad antennas, I was too cheap to have them delivered, so Morad would put them under Northern's dumpsters at close of day, and I'd drive down after work and pick them up. What impressed me more than anything was that they had "business" hours. A concept completely foreign to Anacortes. Lynn, W7LTQ Speaking of Aircraft endorsement, I watched an old John Wayne movie "Island in the Sky" last week on TV (an Ernie Gahn book). The radio op was running what appeared to be a BC348 receiver, and an ART-13 transmitter with a bug. It was in a WWII C-47 (DC-3) plane. Did Northern ever make military receivers? I remember a Northern Electric or Northern Radio version of the Hammurlund SP-600 that I worked on back in the late 60s. I thought it was a Canadian firm that made them under a NATO contract. However, one Navy guy from the pacific NW said they were made in Seattle. Speaking of business hours...I remember a coax distributor in Portland who would hide rolls of coax under his shipping dock so they could be picked up in the early AM on the way to work at the old Portland Radio Supply. You don't get that kind of deal anymore. 73 Doug K7ABX I believe that Northern did make some stuff on Contract for the Military during the war, as I saw some old stuff on the shelves when I first went to work there in early 71....The guy who would know is the Old Chief Engineer, during the early 50's, Dan Farley, if he is still alive. He helped the curater of the Seattle Museum of History & Industry save pristine models of all the old Northern AM Rigs. I helped him procure some of these from old Cannery sites in alaska, over the years. They have a really good Libby, McNiel, Libby 250 Watt Transmitter that used 205th's as Finals and in Modulator. Stood 6 feet high in a 19" Rack, with BIG Meters and Knobs. That came from the Kenai Plant when they dissassembled the old Radio Shack above the Office in the early 80's, after SSB became Manditory. I used to have a classic N529E that was complete with Receiver, and Power Supply stored in Dry Storage, but soimeone trashed it and it went to the scrapmetal guy. 5 feet high 19" Rack, with glowing 866's as Rectifiers on the HV Supply. Man that was Cool to operate. I loved the sound of that dynamotor HV supply in the movie....I made a DVD of the film. Bruce in alaska who has a complete set of Northern Radio Manuals dating back to the early 40's....... -- add a 2 before @ |
.. Speaking of Aircraft endorsement, I watched an old John Wayne movie
"Island in the Sky" last week on TV (an Ernie Gahn book). The radio op was running what appeared to be a BC348 receiver, and an ART-13 transmitter with a bug. It was in a WWII C-47 (DC-3) plane. Did Northern ever make military receivers? I remember a Northern Electric or Northern Radio version of the Hammurlund SP-600 that I worked on back in the late 60s. I thought it was a Canadian firm that made them under a NATO contract. However, one Navy guy from the pacific NW said they were made in Seattle. Speaking of business hours...I remember a coax distributor in Portland who would hide rolls of coax under his shipping dock so they could be picked up in the early AM on the way to work at the old Portland Radio Supply. You don't get that kind of deal anymore. I really don't know about Northern and military receivers, but years (and years) before I got a commercial ticket, I helped a tech install and tune surplus military gear converted to commercial marine by Northern. The biggest one that I recall, was a converted (to crystal control) BC-375. That rig, in the military, was companion to the BC-348 receiver, and I have seen pictures (I'm not quite that old) of the BC-375/BC-348 installation in B-24 and B-17 bombers. Art Collin's ART-13 replaced the BC-375 about as fast as Collins Radio could turn them out. A new surplus (converted to 115vac) BC-348Q, by Wells-Gardner was my first ham receiver for the first ten years. Lynn, W7LTQ |
I always coveted an Aircraft Endorsement, but after I got the Radar
Endorsement, work and feeding four hungry mouths sort of saturated all the time that existed. Northern was always King, I guess, I admired the company, and even did a couple of quick contract jobs for them. When I needed another load of Morad antennas, I was too cheap to have them delivered, so Morad would put them under Northern's dumpsters at close of day, and I'd drive down after work and pick them up. What impressed me more than anything was that they had "business" hours. A concept completely foreign to Anacortes. Lynn, W7LTQ Yep, I worked for Dennis, and Chuck (the Yellow page salesman) for a few years after they bought out Northern Marine Electronics, from Northen Radio as the Service Department. Smoke O'kelly was still at NME, when I left but Lou Navarre had already gone by then.Had a very good relationship with Eddie Zanbergen over at Morad as well, before he died. Still use Morad stuff alot up here. Very good stuff for band weather. Ahhhhh, "the Good Old Days"...... Bruce in alaska Gosh, you remember lots of things that have evaporated here! The names are familiar, but not the faces. Mostly telephone contact when I was in trouble, I guess. Thanks for the smidgen of history about Northern. I always suspected there was some sort of connection between Northern Radio and Northern Marine Electronics, but have never had it explained. Might be a different guy, but there was a "Lou" (old timer) that worked for Nordic Marine Electronics, Seattle service shop in the late 1970's that gave me my entire formal education on Decca Radars. By Telephone (and a couple of times by HF SSB) He really didn't like to talk too much about the 050, which infested our waters, but he enjoyed exposing my stupidity on the 110. A really, really great radar............ or? Dan Asplund, Chuck Johnson or Jim Manwaring had to be consulted on the "Group 9", but with the Washington State Ferries contract continually in jeprody here in Anacortes, they always had me supplied with a spare T/R unit and at times a display..... (always a CRT for times when a half-hour disassembly and windex didn't get the cigarette smoke "fog" cleared up) Lynn, W7LTQ |
In article ,
"Lynn Coffelt" wrote: (always a CRT for times when a half-hour disassembly and windex didn't get the cigarette smoke "fog" cleared up) Lynn, W7LTQ Reminds me of the first time I went on a Service Call on a Halibut Schooner. Skipper was an Old Norwegin, with a heavy accent. He watch me like a hawk, while I tried to figure out why the modulation was so poor. Finally I took the mic apart, and and found the cloth filter in front of the mic element, PLUGGED with snoose. Removed the "Snoose Filter" and reassembled the mic, and let the guy call his brother, out dragging on the Wasihngton Coast. 5 by 9 and strong voice was the reply. That old boy, keep saying the whole time I was onboard, "Thes radio, she never vorked, since they day I bought her, not ever....." When I went back onboard the next spring for the annual tuneup, the Old Boy, remembered me, and never even followed me up to the wheelhouse, and told the crew, "Now fella's there goes a REAL Radioman. He fixed the radio, last year, and she never vorked so good. Never since the day I bought her, not ever....." I can still remeber that guy even 35 years later. The moral to this story is, "Always check the Snoose Filter, if you got poor modulation" Bruce in alaska -- add a 2 before @ |
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I worked at Raytheon in Seattle between Feb 1970 and Oct 1979. I sure remember Bill Pulse. Is he still with us? When I first applied to be an electronics technician, I interviewed with Bill. He rejected me. UG Allen at Raytheon hired me. I worked with the guys from G&L a lot.
I am now retired in Ironwood, Michigan. Yes, getting old is a bitch. I still remember the people and equipment like it was yesterday. Weigel |
Koden MD-3600 Radar
In article ,
Edward Weigel wrote: Me Wrote: In article , "Lynn Coffelt" wrote: - Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years)- What, you taped yours to a diddle stick??? We always just held them in our fingers out in front of the waveguide flange..... Well not on 40Kw Decca 404's.... but all the rest..... Hmmm, sounds like an old timer....The really good techs came from Northern Radio, Radar Electric, and Raytheon Marine back in the 60's and 70's. I am an old Northern Man, and one of the few "Old Boys" left. Don Hollingsworth Sr. is still around at G & L Marine, and he is a Raytheon transplant. Billy Pulse came from the end of the era Radar Electric shop. That's about it for that generation, that still practice the "Art" of Marine Electronics. Same with the "Regulators". (FCC) After the closing of RegionX in Kirkland, there just isn't anyone left that really understands the Marine Mobile Radio Service. Bob Dietch, Bob Zenes, Gary Solsby, Bill Johnson, and even Denny Anderson have all retired. Me getting old is a Bitch......all the good guys just die off.... worked at Raytheon in Seattle between Feb 1970 and Oct 1979. I sure remember Bill Pulse. Is he still with us? When I first applied to be an electronics technician, I interviewed with Bill. He rejected me. UG Allen at Raytheon hired me. I worked with the guys from G&L a lot. am now retired in Ironwood, Michigan. Yes, getting old is a bitch. I still remember the people and equipment like it was yesterday. it has been years, since I had thought of Old U.G. Allen..... but I remeber you, Ed. Can't picture you in my minds eye, but the name sure does resonate in the dusty memories. Yes, Billy Pulse is still around in Bellingham, WA and I talk to the Don's Sr & Jr at G & L Marine from time to time, especially when I get stumped on a Radar problem. Just had one of those last month. Had a Furuno 1941 start losing range over a month or so. Went from solid 36 Mile targets, down to barely 4 mile targets. Still had the OEM Magnitron and something like 6000 Operating Hours logged. So I figured, "tired Maggie" right? Replaced it, and no change. After looking at the Manual Receiver Tuning, and finding that I could run the Tuning Voltage from 5Vdc to 35Vdc with absolutly no change on the received targets, I got really suspicious of the MMIC Front-end. Pulled the T/R Pan and looked at the Tuning Voltage @ the inside of the feedthru Cap inside of the MMIC casting to make sure I just didn't have a broken wire somewhere. Since I didn't have a new MMIC, and also had no way to test the T/R Pan offline, I sent it down to Don Sr. and he did the replacement, and tested it on his testbed Radar Bench. Reinstalled, and have 36 mile targets again. That was the first time I have ever heard of a MMIC having that particular failure. (Tuning Line Voltage not actually tuning the LO in the MMIC) Live and Learn... Bruce in alaska -- add a 2 before @ |
Koden MD-3600 Radar
"Bruce in Alaska" wrote in message ... In article , Edward Weigel wrote: Me Wrote: In article , "Lynn Coffelt" wrote: - Hmmmm......... The guys that showed me the ropes used a Simpson 260 with a battered leather case, an earphone and a wet finger. (Oh, yeah, as you mentioned, an NE-2 taped to the end of a diddle stick) Old Chief Lynn, Anacortes Marine Electronics (for 20 years)- What, you taped yours to a diddle stick??? We always just held them in our fingers out in front of the waveguide flange..... Well not on 40Kw Decca 404's.... but all the rest..... Hmmm, sounds like an old timer....The really good techs came from Northern Radio, Radar Electric, and Raytheon Marine back in the 60's and 70's. I am an old Northern Man, and one of the few "Old Boys" left. Don Hollingsworth Sr. is still around at G & L Marine, and he is a Raytheon transplant. Billy Pulse came from the end of the era Radar Electric shop. That's about it for that generation, that still practice the "Art" of Marine Electronics. Same with the "Regulators". (FCC) After the closing of RegionX in Kirkland, there just isn't anyone left that really understands the Marine Mobile Radio Service. Bob Dietch, Bob Zenes, Gary Solsby, Bill Johnson, and even Denny Anderson have all retired. Me getting old is a Bitch......all the good guys just die off.... worked at Raytheon in Seattle between Feb 1970 and Oct 1979. I sure remember Bill Pulse. Is he still with us? When I first applied to be an electronics technician, I interviewed with Bill. He rejected me. UG Allen at Raytheon hired me. I worked with the guys from G&L a lot. am now retired in Ironwood, Michigan. Yes, getting old is a bitch. I still remember the people and equipment like it was yesterday. it has been years, since I had thought of Old U.G. Allen..... but I remeber you, Ed. Can't picture you in my minds eye, but the name sure does resonate in the dusty memories. Yes, Billy Pulse is still around in Bellingham, WA and I talk to the Don's Sr & Jr at G & L Marine from time to time, especially when I get stumped on a Radar problem. Just had one of those last month. Had a Furuno 1941 start losing range over a month or so. Went from solid 36 Mile targets, down to barely 4 mile targets. Still had the OEM Magnitron and something like 6000 Operating Hours logged. So I figured, "tired Maggie" right? Replaced it, and no change. After looking at the Manual Receiver Tuning, and finding that I could run the Tuning Voltage from 5Vdc to 35Vdc with absolutly no change on the received targets, I got really suspicious of the MMIC Front-end. Pulled the T/R Pan and looked at the Tuning Voltage @ the inside of the feedthru Cap inside of the MMIC casting to make sure I just didn't have a broken wire somewhere. Since I didn't have a new MMIC, and also had no way to test the T/R Pan offline, I sent it down to Don Sr. and he did the replacement, and tested it on his testbed Radar Bench. Reinstalled, and have 36 mile targets again. That was the first time I have ever heard of a MMIC having that particular failure. (Tuning Line Voltage not actually tuning the LO in the MMIC) Live and Learn... Bruce in alaska UG Allen!!!! Holy Smokes, I don't think I've heard that name for 20 years! He helped me (via telephone) work my way through a Raytheon that I'd never seen before...... forget the model number, but you guys probably are familiar with the beast. 115vac motor generator wasn't it that turned a big fat open scanner with a tube transmitter and receiver inside the scanner? Big orange filtered CRT...... all the letters and numbers worn completely off the indicator controls, substituted by big black pencil marks where the skipper had the best luck. Easily picked seagulls out at 1/4 mile on flat water. Quarter size burned spot in center of CRT..... standard for those Raytheons according to UG.... Local fishermen told me that he was the smartest man they had ever met, and that he was black. I never met him face to face, but he taught me (telephone again) the fine points of tuning a 1600 and the hot new 2600. Those were the days!!!! Old Chief Lynn |
Koden MD-3600 Radar
In article ,
"Lynn Coffelt" wrote: "Bruce in Alaska" wrote in message ... In article , Edward Weigel wrote: snipped for brevity it has been years, since I had thought of Old U.G. Allen..... but I remeber you, Ed. Can't picture you in my minds eye, but the name sure does resonate in the dusty memories. Yes, Billy Pulse is still around in Bellingham, WA and I talk to the Don's Sr & Jr at G & L Marine from time to time, especially when I get stumped on a Radar problem. Just had one of those last month. Had a Furuno 1941 start losing range over a month or so. Went from solid 36 Mile targets, down to barely 4 mile targets. Still had the OEM Magnitron and something like 6000 Operating Hours logged. So I figured, "tired Maggie" right? Replaced it, and no change. After looking at the Manual Receiver Tuning, and finding that I could run the Tuning Voltage from 5Vdc to 35Vdc with absolutly no change on the received targets, I got really suspicious of the MMIC Front-end. Pulled the T/R Pan and looked at the Tuning Voltage @ the inside of the feedthru Cap inside of the MMIC casting to make sure I just didn't have a broken wire somewhere. Since I didn't have a new MMIC, and also had no way to test the T/R Pan offline, I sent it down to Don Sr. and he did the replacement, and tested it on his testbed Radar Bench. Reinstalled, and have 36 mile targets again. That was the first time I have ever heard of a MMIC having that particular failure. (Tuning Line Voltage not actually tuning the LO in the MMIC) Live and Learn... Bruce in alaska UG Allen!!!! Holy Smokes, I don't think I've heard that name for 20 years! He helped me (via telephone) work my way through a Raytheon that I'd never seen before...... forget the model number, but you guys probably are familiar with the beast. 115vac motor generator wasn't it that turned a big fat open scanner with a tube transmitter and receiver inside the scanner? Big orange filtered CRT...... all the letters and numbers worn completely off the indicator controls, substituted by big black pencil marks where the skipper had the best luck. Easily picked seagulls out at 1/4 mile on flat water. Quarter size burned spot in center of CRT..... standard for those Raytheons according to UG.... Local fishermen told me that he was the smartest man they had ever met, and that he was black. I never met him face to face, but he taught me (telephone again) the fine points of tuning a 1600 and the hot new 2600. Those were the days!!!! Old Chief Lynn Yea, UG was a hell of a Radarman back in the day... Lynn, your thinking of the Raytheon 1700 Radar, that had a DC Motor/AC Generator that turned the antenna as well as provided the 115Vac that ran the electronics, from the DC voltage input. They came in 12, 24, 32, and 110Vdc versions. My first 12Vdc/115AC PowerConverter in my 1958 Dodge PowerWagon PanelTruck was one of those from a scrapped out 1700 that I got from UG. RadioMen loved those old Raytheon Radars, as they had a MTBF of about 100 Operating Hours. Crystals were a instant $50 fix, for their pocketbook, and 2J42's were forever getting cooked by to high of heater voltage. The thing I hated about 1700's was cleaning all those sliprings on the antenna unit that feed the display. The 1700 also had a headphone jack, on the receiver end of the antenna, so you could hear the Baseband while tuning the 2K25 Klystron LO. Bruce in alaska remembering those Goodtimes, of bygone days..... -- add a 2 before @ |
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