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....

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....

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....

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

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 @

"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

"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