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RB December 12th 05 08:00 PM

loran questions
 
Got a question on LORAN sets. I don't want to get into the desireability of
GPS as the nav mode of choice today. I'm fiddling around with LORAN and
trying to get going with it.

1. What is/are LORAN operating frequencies?

2. Marine LORANS are found with external couplers (pre-amps) which go at
the base of the fiberglass/whip antenna. Can marine LORANs which are made
for use with external couplers give reasonably good performance without the
coupler? Or, is lack of the coupler a "killer"?

2. Are there marine LORAN receivers which don't require external couplers
(i.e., that hook direct to the antenna)?

3. If you have a marine LORAN which does in fact need an external coupler
to get enough signal through and you don't have the companion coupler unit,
are any commonly available pre-amp boards for the LORAN frequencies
available? If so, where find?



GregS December 12th 05 09:37 PM

loran questions
 
In article , "RB" wrote:
Got a question on LORAN sets. I don't want to get into the desireability of
GPS as the nav mode of choice today. I'm fiddling around with LORAN and
trying to get going with it.

1. What is/are LORAN operating frequencies?

2. Marine LORANS are found with external couplers (pre-amps) which go at
the base of the fiberglass/whip antenna. Can marine LORANs which are made
for use with external couplers give reasonably good performance without the
coupler? Or, is lack of the coupler a "killer"?

2. Are there marine LORAN receivers which don't require external couplers
(i.e., that hook direct to the antenna)?

3. If you have a marine LORAN which does in fact need an external coupler
to get enough signal through and you don't have the companion coupler unit,
are any commonly available pre-amp boards for the LORAN frequencies
available? If so, where find?



Man, I had to do a little searching. We used to track Loran to check long term timming
stability of atomic clocks. 100 kHz seems the right frequency. A loran signal
is probably best received using a loop antenna, but for receiving multiple direction
signals a whip is needed I'm sure.
All you need is a 100kHz amplifier, probably low passed and preferably
bandpassed matched to the antenna, and to the receiver input.

greg

Larry December 13th 05 12:52 AM

loran questions
 
"RB" wrote in
:

Got a question on LORAN sets. I don't want to get into the
desireability of GPS as the nav mode of choice today. I'm fiddling
around with LORAN and trying to get going with it.

1. What is/are LORAN operating frequencies?

100 Khz, all stations are on the same frequency, exactly. They use a
cesium beam frequency standard to make sure it's perfect.


2. Marine LORANS are found with external couplers (pre-amps) which go
at the base of the fiberglass/whip antenna. Can marine LORANs which
are made for use with external couplers give reasonably good
performance without the coupler? Or, is lack of the coupler a
"killer"?


Killer. The very-low frequency LORAN antenna is electrically 2340' long
(1/4 wavelength on 100 Khz). To achieve this in an 8' long whip it is
VERY heavily loaded with a large inductance and that coupler. No, you
can only get it working with the cou0ler or a 2,340' long whip, your
choice.


2. Are there marine LORAN receivers which don't require external
couplers (i.e., that hook direct to the antenna)?


The couplers on the marine antennas are built into the whip. They're
still there.


3. If you have a marine LORAN which does in fact need an external
coupler to get enough signal through and you don't have the companion
coupler unit, are any commonly available pre-amp boards for the LORAN
frequencies available? If so, where find?


It's not a preamp problem. There's tons of signal from teh MEGAWATT
LORAN-C pulse transmitters and their massive capacitor hat loaded 850'
tall antenna towers. The problem is that 2340' 1/4 wave whip it takes to
hook 'em up.

You need the antenna system it came with.....


Lynn Coffelt December 13th 05 06:42 AM

loran questions
 

"Larry" wrote in message . Killer. The very-low frequency
LORAN antenna is electrically 2340' long
(1/4 wavelength on 100 Khz). To achieve this in an 8' long whip it is
VERY heavily loaded with a large inductance and that coupler. No, you
can only get it working with the cou0ler or a 2,340' long whip, your
choice.


2. Are there marine LORAN receivers which don't require external
couplers (i.e., that hook direct to the antenna)?


The couplers on the marine antennas are built into the whip. They're
still there.


3. If you have a marine LORAN which does in fact need an external
coupler to get enough signal through and you don't have the companion
coupler unit, are any commonly available pre-amp boards for the LORAN
frequencies available? If so, where find?


It's not a preamp problem. There's tons of signal from teh MEGAWATT
LORAN-C pulse transmitters and their massive capacitor hat loaded 850'
tall antenna towers. The problem is that 2340' 1/4 wave whip it takes to
hook 'em up.

You need the antenna system it came with.....


While there is certainly no question that the matching coupler and 8' whip
are pretty much standard, just for fun we experimented with some of the old
TI lorans, and found that the SSB antennas on many power and sail boats
worked fairly well, with one major "gotcha". Loran C, at 100 khz is very
easily messed up by electrical noises from almost anything on a boat. Having
the 8' whip antenna up and away (several feet at least) from the noise
makers and the boat's wiring, made major differences in noise pick-up. Water
damaged TI loran couplers were pretty common, and you could pull the guts
out and throw them away, and jumper the whip connector to the signal feed
wire inside the coupler. Performance not perfect by a long shot, but if you
shut down the main engine and everything else, you could get a fix. (the
hard way)
Old Chief Lynn



RB December 13th 05 06:08 PM

loran questions
 
OK. Thanks, Larry. That means all those nice LORAN receivers for sale on
Eprey without couplers basically aren't useable. Which is probably why the
go so cheap......



Eric Fairbank December 22nd 05 09:36 PM

loran questions
 

I have a few loran couplers laying around, some trimble, northstar, TI,
possibly a SI-Tex. I could give you one for the price of shipping if you
want. Don't know what model Loran your looking at, some couplers
interchangeable, some not.

Eric

"RB" wrote in message
...
3. If you have a marine LORAN which does in fact need an external coupler
to get enough signal through and you don't have the companion coupler
unit, are any commonly available pre-amp boards for the LORAN frequencies
available? If so, where find?




[email protected] December 23rd 05 02:12 AM

loran questions
 
What is in these "couplers" is it just a huge inductor to cancel out
the capacitive reactance?

I discovered this phenomenon the hard way when I replaced the shielded
cable on my car antenna with just some simple coax. Absolutely no AM
signal at the end. Then I figured out why the real cable is a coax
with a very tiny center conductor inside a hollow tube to minimize the
capacitance. If you used something similar to connect any antenna to
your loran it would probably work better.

Have fun.


Eric Fairbank December 23rd 05 02:15 PM

loran questions
 

These are "active" antenna's. Power is provided via the coax and there is
a PCB in there with a pre-amplifier circuit. Some units have notch filters
and/or bandpass filters in them.

Eric

wrote in message
oups.com...
What is in these "couplers" is it just a huge inductor to cancel out
the capacitive reactance?

I discovered this phenomenon the hard way when I replaced the shielded
cable on my car antenna with just some simple coax. Absolutely no AM
signal at the end. Then I figured out why the real cable is a coax
with a very tiny center conductor inside a hollow tube to minimize the
capacitance. If you used something similar to connect any antenna to
your loran it would probably work better.

Have fun.




Larry December 23rd 05 02:31 PM

loran questions
 
"Eric Fairbank" wrote in
:

These are "active" antenna's. Power is provided via the coax and
there is
a PCB in there with a pre-amplifier circuit. Some units have notch
filters and/or bandpass filters in them.

Eric



Don't confuse them. They think you can plug just any old thing into any
old thing just because it has the same BNC connector and it will be on the
cheap.

If we go telling them different, technicians' families will starve and have
a bad Christmas...

Not long ago I found a formerly-good GPS front end plugged into a formerly-
good LORAN receiver, myself...

They're pretty close, right?....(c;


Wayne.B December 23rd 05 11:35 PM

loran questions
 
On Fri, 23 Dec 2005 09:15:42 -0500, "Eric Fairbank"
wrote:

These are "active" antenna's. Power is provided via the coax and there is
a PCB in there with a pre-amplifier circuit. Some units have notch filters
and/or bandpass filters in them.


=====================================

Absolutely right. If anyone really wants to hack around with this
stuff I have a couple of Northstar LORAN-C units sitting around
without antennas or couplers. They were first class units in their
day and have SO-239 coax connectors on the back.


Larry December 24th 05 12:50 AM

loran questions
 
Wayne.B wrote in
:

Absolutely right. If anyone really wants to hack around with this
stuff I have a couple of Northstar LORAN-C units sitting around
without antennas or couplers. They were first class units in their
day and have SO-239 coax connectors on the back.



I have someone Christmas gift, too. I have a perfectly good-working
Stephens Engineering SEA-106 HF synthesized SSB Marine transceiver with
microphone and NO CABLES OR COUPLER in first class condition I'll give to
the first person who shows up to pick it up. If you have a SEA-106, or
know someone who has one, this one hasn't a scratch. It was at the main
helm of a motoryacht, inside in the air conditioning, all those years.
It's owner said it had been removed when they restored the helm's
woodwork and made a new panel for new gear. Someone threw out all the
cables and coupler which was dumped in another box away from the
transceiver. Sorry.... He said it was working when uninstalled, but he
wanted a marine radio that would work with his new ham license more
easily.

The power plug is marked with + and - and "ON" terminals, which I assume
is a remote power switch to just jumper out. I have no book, no cables,
as it was handed to me after installing a new Icom M802 on the boat. I
never turn down free stuff, even if I have no clue....

Of course, it comes with a full money-back guarantee....(c;

Munge up your email address and post it in reply if you want it....PICKUP
ONLY in Charleston, SC.


Wayne.B December 24th 05 01:13 AM

loran questions
 
On Fri, 23 Dec 2005 19:50:37 -0500, Larry wrote:

I have someone Christmas gift, too. I have a perfectly good-working
Stephens Engineering SEA-106 HF synthesized SSB Marine transceiver


===========================

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.


Larry December 24th 05 02:59 AM

loran questions
 
Wayne.B wrote in
:

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.




You know if we keep this up we'll end up with S/V "Newsgroup", a nice old
Morgan OI 41 loaded with antique electronic gear, for next Christmas...(c;


Larry December 24th 05 03:00 AM

loran questions
 
Wayne.B wrote in
:

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.



God, if the Ebay hawkers see this giveaway going on they're gonna have a
HEART ATTACK for Christmas!....(c;


Bruce in Alaska December 24th 05 07:11 PM

loran questions
 
In article ,
Larry wrote:

Wayne.B wrote in
:

Absolutely right. If anyone really wants to hack around with this
stuff I have a couple of Northstar LORAN-C units sitting around
without antennas or couplers. They were first class units in their
day and have SO-239 coax connectors on the back.



I have someone Christmas gift, too. I have a perfectly good-working
Stephens Engineering SEA-106 HF synthesized SSB Marine transceiver with
microphone and NO CABLES OR COUPLER in first class condition I'll give to
the first person who shows up to pick it up. If you have a SEA-106, or
know someone who has one, this one hasn't a scratch. It was at the main
helm of a motoryacht, inside in the air conditioning, all those years.
It's owner said it had been removed when they restored the helm's
woodwork and made a new panel for new gear. Someone threw out all the
cables and coupler which was dumped in another box away from the
transceiver. Sorry.... He said it was working when uninstalled, but he
wanted a marine radio that would work with his new ham license more
easily.

The power plug is marked with + and - and "ON" terminals, which I assume
is a remote power switch to just jumper out. I have no book, no cables,
as it was handed to me after installing a new Icom M802 on the boat. I
never turn down free stuff, even if I have no clue....

Of course, it comes with a full money-back guarantee....(c;

Munge up your email address and post it in reply if you want it....PICKUP
ONLY in Charleston, SC.


Larry, I can supply a complete Manual for that SEA-106, if someone wants
to photocopy my Shop Manual. These are a bit dated and you have to check
the Prom Version to make sure it has the latest Frequency Lineup, as
the FCC/ITU did change the channel configurations for MF/HF Marine
Systems back in that day.... I also have complete Master Prom Sets for
ALL the SEA Radio's that have the later FCC/ITU Frequnecy Lineups.
Does your Radio have the two Frequency dials on the front panel, or is
it the Prom only version.

Bruce in alaska
--
add a 2 before @

Bruce in Alaska December 24th 05 07:12 PM

loran questions
 
In article ,
Wayne.B wrote:

On Fri, 23 Dec 2005 19:50:37 -0500, Larry wrote:

I have someone Christmas gift, too. I have a perfectly good-working
Stephens Engineering SEA-106 HF synthesized SSB Marine transceiver


===========================

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.


is the drivemotor 12Vdc or 32Vdc?


Bruce in alaska
--
add a 2 before @

Bruce in Alaska December 24th 05 07:15 PM

loran questions
 
In article ,
Larry wrote:

Wayne.B wrote in
:

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.




You know if we keep this up we'll end up with S/V "Newsgroup", a nice old
Morgan OI 41 loaded with antique electronic gear, for next Christmas...(c;


Maybe we could have a NewsGroup Auction...with the proceeds going to
some Marine Electronics Foundation for Educating of Mariners.....

I got a whole warehouse (Dry Storage) full of Boat Anchor Marine
Electronics.....

Bruce in alaska
--
add a 2 before @

Larry December 25th 05 12:18 AM

loran questions
 
Bruce in Alaska wrote in news:bruceg-
:

Does your Radio have the two Frequency dials on the front panel, or is
it the Prom only version.



There are two knobs. One marked USA and one marked Europe receive. The
display is LED above them. There seems to be no frequency knobs. The
switch under the display is in Mhz for the various bands. There are 16
channels on each band, I suppose, right? I've never used it. It sat here
for a year and is useless to me. It's very nicely made...like something
you'd put on an Alaskan trawler...(c; There's a push button marked USA -
Europe to switch the channels, probably for the old duplex telephone
company channels.

Free for the asking....a sign of how popular HF is getting to be.

I figured if someone was using one, they'd like a free spare for parts or a
hot-swap-at-sea spare.


Larry December 25th 05 12:21 AM

loran questions
 
Bruce in Alaska wrote in news:bruceg-
:

I got a whole warehouse (Dry Storage) full of Boat Anchor Marine
Electronics.....


One of my ham friends, the finest guy you'd ever encounter, has a little
"collector fetish", too. He collects military stuff he finds interesting.
I haven't been in his living room in 15 years, since the little path
between the piles filled in. It's right up to the living room ceiling,
just like the SeaLand containers and huge storage barn in his back yard....

When I need hard-to-find parts to fix old organs, especially ICs, I know
who to ask before internet....(c;


Bruce in Alaska December 25th 05 07:20 PM

loran questions
 
In article ,
Larry wrote:

Bruce in Alaska wrote in news:bruceg-
:

Does your Radio have the two Frequency dials on the front panel, or is
it the Prom only version.



There are two knobs. One marked USA and one marked Europe receive. The
display is LED above them. There seems to be no frequency knobs. The
switch under the display is in Mhz for the various bands. There are 16
channels on each band, I suppose, right? I've never used it. It sat here
for a year and is useless to me. It's very nicely made...like something
you'd put on an Alaskan trawler...(c; There's a push button marked USA -
Europe to switch the channels, probably for the old duplex telephone
company channels.

Free for the asking....a sign of how popular HF is getting to be.

I figured if someone was using one, they'd like a free spare for parts or a
hot-swap-at-sea spare.


Yep, that is the Prom only version. A better version is the one with
two sets of Thumbwheel Switch groups, that can be used to set the Tx and
Rx frequencies from the front panel. There are a bunch of hams that use
these for digital operations. There is also a LSB option for the 106 as
well, if your rich and famous.....


Bruce in alaska
--
add a 2 before @

Larry December 26th 05 12:10 AM

loran questions
 
Bruce in Alaska wrote in news:bruceg-
:

well, if your rich and famous.....



I am rich and famous. I use Yaesu ham radios...(c;

They come with LSB and 10 Hz steps, not 100 or 1Khz.


Lynn Coffelt December 26th 05 04:21 AM

loran questions
 

"Larry" wrote in message
...
Bruce in Alaska wrote in news:bruceg-
:

well, if your rich and famous.....



I am rich and famous. I use Yaesu ham radios...(c;

They come with LSB and 10 Hz steps, not 100 or 1Khz.

Heck, that ain't nothing! My RME4350 goes 20 times further than
that....... just during warm up.
Lynn W7LTQ



Larry December 26th 05 12:00 PM

loran questions
 
"Lynn Coffelt" wrote in news:donr4h$1u6$1
@domitilla.aioe.org:

just during warm up.


Warmup? 4-1000's don't warmup...(c;

Oh, you mean until the graphite plates are cherry red on the pair of
them...(c;


Lynn Coffelt December 26th 05 06:38 PM

loran questions
 

"Larry" wrote in message
...
"Lynn Coffelt" wrote in news:donr4h$1u6$1
@domitilla.aioe.org:

just during warm up.


Warmup? 4-1000's don't warmup...(c;

Oh, you mean until the graphite plates are cherry red on the pair of
them...(c;


Well, not exactly, but we did run cherry red graphites for a time on the
homebrew push-pull 211's (aka VT-127?). Shame the plate xformer smoked
during ARRL RCC certificate attempts.

Lynn W7LTQ



Leanne December 26th 05 08:28 PM

loran questions
 

"Lynn Coffelt" wrote in message
...

"Larry" wrote in message
...
"Lynn Coffelt" wrote in news:donr4h$1u6$1
@domitilla.aioe.org:

just during warm up.


Warmup? 4-1000's don't warmup...(c;

Oh, you mean until the graphite plates are cherry red on the pair of
them...(c;


Well, not exactly, but we did run cherry red graphites for a time on the
homebrew push-pull 211's (aka VT-127?). Shame the plate xformer smoked
during ARRL RCC certificate attempts.


Nothing like the warm glow of a pair of 3-500's key down on rtty, on a cold
winter's night. Almost as warming as a fireplace.

Leanne
W1WXS



Lynn Coffelt December 27th 05 12:40 AM

loran questions
 

homebrew push-pull 211's (aka VT-127?)


OK, my bad. should read "(aka VT-4C)" it was almost 60 years ago.

Lynn W7LTQ



Larry December 27th 05 02:02 AM

loran questions
 
"Leanne" wrote in :

Nothing like the warm glow of a pair of 3-500's key down on rtty, on a
cold winter's night. Almost as warming as a fireplace.

Leanne
W1WXS




You never saw the big 4-1000A amp I got from JD Black, WA4DVK in
Orangeburg, did you? It was in a WW2 Navy transmitter cabinet 24" wide
and 7' high. Pole pig hooked up backwards for 7200VDC, cut back to 6KV
with a 230VAC 30A variac beast on the primary, home brew filament
transformer, regulated screen power supply for stability, running COMMON
CATHODE! Input was a 50 ohm, 100W dummy load into a drive potentiometer
so you could turn the drive back to where the tubes were designed to
operate. No tuned input necessary, it was a dummy load for the rig.
Output was a shunt-fed Pi network with huge rotary inductor with nice
turns counter, 500pF, 30KV vacuum variable input and broadcast air
variable dual ganged output cap both with nice vernier, calibrated dials
for fast band changing. Huge broadcast transmitter meters across the
top, screen-shielded window to impress the shack guests looking in over
the pair of 4-1000A graphite Amperex finals.

I brought a piece of melted RG-8 to a club meeting one night.
"Somethin' ain't right!", I told 'em...(c; Great fun on 75M on a cold
winter night. The little Heath HW-100 transceiver and a coaxial antenna
changeover relay and we're in business...(c; Run about 20W into it and
you'd see 6KV on one meter and nearly 1A on the plate meter. That's
about a kilowatt, right?....Right!

In Sumter, my neighbor's hall light was resonant around 3900 Khz. It
followed the SSB modulation, lighting up quite brightly...(c;

POWER is our FRIEND....


Larry December 27th 05 02:04 AM

loran questions
 
"Lynn Coffelt" wrote in news:doq2id$g23$1
@domitilla.aioe.org:

OK, my bad. should read "(aka VT-4C)" it was almost 60 years ago.



You're telling me. My father just moved into a nursing home at 83 and I've
been going through the junk. Found a picture of me in my sailor suit when
I was an ET3 back in '65. Nice lookin' kid, but that was FORTY YEARS AGO!

How awful....


Wayne.B December 28th 05 03:50 AM

loran questions
 
On Sat, 24 Dec 2005 19:12:56 GMT, Bruce in Alaska
wrote:

I will see that and raise you a Stephens SEA112 with coupler. With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.


is the drivemotor 12Vdc or 32Vdc?


================================

12 volts


Lynn Coffelt December 28th 05 04:55 AM

loran questions
 
With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.


is the drivemotor 12Vdc or 32Vdc?


================================

12 volts

Last year we put a Wood-Freeman mechanical, chain drive monster on a
commercial fishing vessel. Of course we used Comnav electronics and motor
driver. (new mercury contactors are rare and expensive!)

Lynn



Wayne.B December 28th 05 05:55 AM

loran questions
 
On Tue, 27 Dec 2005 20:55:11 -0800, "Lynn Coffelt"
wrote:

(new mercury contactors are rare and expensive!)


Any idea what the 2 that I have are worth? Not sure if they are
working of course.


Bruce in Alaska December 28th 05 06:33 PM

loran questions
 
In article ,
"Lynn Coffelt" wrote:

Last year we put a Wood-Freeman mechanical, chain drive monster on a
commercial fishing vessel. Of course we used Comnav electronics and motor
driver. (new mercury contactors are rare and expensive!)

Lynn


Nothing like an old Wood Freeman Brass Gearbox Chaindrive....
I suspect you could build a PowerMosFET driver for one of these
without too much trouble. I wonder what Bruce @ Wood-Freeman is
using instead of Mercury Switches these days? I have seen a lot
of different AutoPilot Boxes driving Wood-Freeman Motordrives
over the years. Worked on a Model 12 last summer, for a Troller...
now that is OLD......


Bruce in alaska
--
add a 2 before @

Wayne.B December 28th 05 06:50 PM

loran questions
 
On Wed, 28 Dec 2005 18:33:39 GMT, Bruce in Alaska
wrote:

Nothing like an old Wood Freeman Brass Gearbox Chaindrive....
I suspect you could build a PowerMosFET driver for one of these
without too much trouble. I wonder what Bruce @ Wood-Freeman is
using instead of Mercury Switches these days? I have seen a lot
of different AutoPilot Boxes driving Wood-Freeman Motordrives
over the years. Worked on a Model 12 last summer, for a Troller...
now that is OLD......


=================================

Know anyone who could use one circa 1981 or so? I have both the motor
drive and the control box although it is likely that some part of it
is not working since it was already replaced at the time I bought the
boat. I deinstalled the Wood-Freeman components last year to make
more room under the flybridge console. It is a 12 volt unit from a
Grand Banks 49 Classic trawler.


Lynn Coffelt December 28th 05 10:34 PM

loran questions
 
Last year we put a Wood-Freeman mechanical, chain drive monster on a
commercial fishing vessel. Of course we used Comnav electronics and

motor
driver. (new mercury contactors are rare and expensive!)

Lynn


Nothing like an old Wood Freeman Brass Gearbox Chaindrive....
I suspect you could build a PowerMosFET driver for one of these
without too much trouble. I wonder what Bruce @ Wood-Freeman is
using instead of Mercury Switches these days? I have seen a lot
of different AutoPilot Boxes driving Wood-Freeman Motordrives
over the years. Worked on a Model 12 last summer, for a Troller...
now that is OLD......


Haven't talked to Bruce since I sold shop 10 years ago. I did talk to Doc's
son about the four-wire motor color code I think last year. I see in their
website they have a "solid-state" driver that replaces tilting tables
"sensitive relays" and everything! Also we installed a few "solid-state
switchers" maybe 15 years ago, for the "500" when using two pump sets in
tandem. (mostly on Kodiak seiners that were lengthened to "limit" seiners) I
still have a warm and fuzzy feeling for the cast brass, manual clutch and
stainless steel chains "Iron Mike".

I gathered up two SEA-106's (I think that's the model), one with the
Eproms and one with the thumb wheels. Drew diagrams and accumulated parts to
convert the EPROM model (with freq display) to a knob tuned, all frequency
Ham rig. Was discouraged and quit when my talents couldn't figure how to
tune it in smaller than 10khz increments with SEA's decoding system for the
VCO........sigh.

Lynn, "Has-Been Guru"



Doug December 29th 05 08:40 PM

loran questions
 

"Lynn Coffelt" wrote in message
...
With
the right incentives I might also throw in a Wood Freeman auto pilot
assembly (chain drive). It is a mechanical marvel and only weighs 50
pounds or so.


is the drivemotor 12Vdc or 32Vdc?


================================

12 volts

Last year we put a Wood-Freeman mechanical, chain drive monster on a
commercial fishing vessel. Of course we used Comnav electronics and motor
driver. (new mercury contactors are rare and expensive!)

Lynn


I believe there still is an upgrade for the mercury contactors to solid
state plug ins available somewhere. I recall we sent some out for upgrade
about 3 years ago. The boss is on vacation this week (why I am back in the
shop after retiring). I am sure he could ID the source if anyone needs them.
73
Doug K7ABX



Doug December 29th 05 08:43 PM

loran questions
 

"Larry"----- Original Message -----
From: "Larry"
Newsgroups: rec.boats.electronics
Sent: Saturday, December 24, 2005 4:21 PM
Subject: loran questions


SNIP..

When I need hard-to-find parts to fix old organs, especially ICs, I know
who to ask before internet....(c;

Hey Larry,
Thought you might be interested to know that the owner, long since retired,
of my employer, is Rodgers Jenkins, the founder of Rodgers Organ, a
Tektronixs spin off. See www.rodgersmarine.com for a company histroy.
73
Doug K7ABX CTMCS USN (Retired)
wrote in message
...



Doug December 29th 05 08:49 PM

loran questions
 

"Lynn Coffelt" wrote in message
...

"Larry" wrote in message
...
Bruce in Alaska wrote in news:bruceg-
:

well, if your rich and famous.....



I am rich and famous. I use Yaesu ham radios...(c;

They come with LSB and 10 Hz steps, not 100 or 1Khz.

Heck, that ain't nothing! My RME4350 goes 20 times further than
that....... just during warm up.
Lynn W7LTQ


Ever thought of trying some zener diodes or solid state regulators in it to
see if stabalizes? Do is have VR type gaseous regulator tubes? It been a few
years since I peeked inside an RME.
Doug K7ABX



Doug December 29th 05 08:58 PM

loran questions
 

"Leanne" wrote in message
...

"Lynn Coffelt" wrote in message
...

"Larry" wrote in message
...
"Lynn Coffelt" wrote in news:donr4h$1u6$1
@domitilla.aioe.org:

just during warm up.


Warmup? 4-1000's don't warmup...(c;

Oh, you mean until the graphite plates are cherry red on the pair of
them...(c;


Well, not exactly, but we did run cherry red graphites for a time on the
homebrew push-pull 211's (aka VT-127?). Shame the plate xformer smoked
during ARRL RCC certificate attempts.


Nothing like the warm glow of a pair of 3-500's key down on rtty, on a
cold
winter's night. Almost as warming as a fireplace.

Leanne
W1WXS


And the solder running out of the 3-500 tube pins. I restored a large box of
pulled 3-500Z's back in 1970 when I arrived on Adak Island. Some of the MARS
ops at KL7AIZ were not real good about tuning the Henry 2K3 with Johnson
Viking matchbox into the 80 meter rhombic. The tubes got so hot the solder
ran out of the pins. Once I discovered the fix, there was talk of awarding
me some kind of medal!
73
Doug K7ABX



Bruce in Alaska December 29th 05 09:05 PM

SEA-106 was loran questions
 
In article ,
"Lynn Coffelt" wrote:

I gathered up two SEA-106's (I think that's the model), one with the
Eproms and one with the thumb wheels. Drew diagrams and accumulated parts to
convert the EPROM model (with freq display) to a knob tuned, all frequency
Ham rig. Was discouraged and quit when my talents couldn't figure how to
tune it in smaller than 10khz increments with SEA's decoding system for the
VCO........sigh.

Lynn, "Has-Been Guru"


As I remember it the 106 didn't have a divider chain that went down past
10Khz, because 100Khz was the minimum channel spacing at the time for
commercial MF/HF radios. I think Bill Forgey wanted to go to 100Hz,
but got overruled by the Marketing Guys, as it would cost to much to
impliment that into the radio. Sure made the VCO Loops, a lot easier to
design. I remember how interested those guys were to look at my Kenwood
TS-430, that I got right after they came on the market. Bill, Mark,
and Pete Hopp, did a complete Type Acceptance proceedure on it, in the
Design Lab just to see how good the design was. I saw the data, and it
would have passed on all the technical stuff, just wouldn't meet the
Operator Control Requirements. They were very impressed, and the result
was the SEA-322, which has one of the best commercial Marine Specs
around.

Bruce in alaska
--
add a 2 before @

Larry December 30th 05 01:46 AM

loran questions
 
"Doug" wrote in
ink.net:

Thought you might be interested to know that the owner, long since
retired, of my employer, is Rodgers Jenkins, the founder of Rodgers
Organ, a Tektronixs spin off. See www.rodgersmarine.com for a company
histroy. 73
Doug K7ABX CTMCS USN (Retired)


That is cool, Doug. There are a few Rodgers around Charleston, left by a
little dealer that started up with way too much stock, way too little
capital and way too few buyers. He left a few of them and I think he's
still coming to service them, but not sure any more. I rarely get to fix
one. Hell, any more I rarely get to fix ANY! The business has gone all
to hell. I've spent this week rebuilding a computer network for a real
estate office, cleaning the internet's excrement off their computers and
making it so copy-protected, damnable Windows XP can be force-fed, even
when it doesn't want to, so they can go about their business, unimpeded
by the billionaire from Redmond....(c;

Rodgers made nice organs, but the prices put them in the ALLEN class
without the lifetime Allen support, which also did in several more
bigshot organ companies. Allen's still got parts for their 1962
model...in stock for shipment, immediately. UNfortunately, they won't
ship them to ME to make the customers happy, trying to force them to get
service from the overloaded dealer's boy at $25 more an hour....

Larry W4CSC ET1...1964-1969...


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