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Old January 7th 06, 12:40 AM posted to rec.radio.amateur.boatanchors
Fred W4JLE
 
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Default Collins 18 S-4

I have a manual coming, if you have any particular areas you need info on
let me know.

If the copyright has expired, I will scan it an publish it on LuLu press.

I have two and I am awaiting the manual to see what goes in the rear of the
chasis that seems to be missing from both of mine.

There is a cradle that goes across the back and nothing occupies the space
on either of mine.

"MilRad" wrote in message
...

Thanks for the great tips. I guess I will nail down a manual/schematic
and lay down a battle plan from then on. I like the VFO/RF section
idea.

73,

Mark


K3HVG Wrote:
Mark, I built a control head. No big thing. Also, AM is the deafult.
All you really need do is plug in a mic on the front panel. RF and AF
gain must be controlled externally, of course. The crystals you have
won't do you much good but you can have a set cut for.. say 3885, or
such. That's what I did. I hooked a Heath VFO up to the transmitter
and it worked OK. The 18-S4A receiver is much better than the
straight
unit inasmuch as it has a mech filter installed. The straight unit is
as broad as a TCS! Also, I did not use the fixed elements in the TX
tank circuit. I brought out the "untuned" RF into an external
PI-network (instead of the tuner) for 80 meters. That way, I could
tune
wherever needed and not worry about the fixed freq. tank components.
I
have both original Collins 18-S4 and 18-S4A manuals. Unfortunately, I
no longer have "unlimited copy capability"...hi!



--
MilRad



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Old January 7th 06, 10:05 PM posted to rec.radio.amateur.boatanchors
K3HVG
 
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Default Collins 18 S-4

Unless I'm missing something, I think you'll find that's where the
dynamotor goes. And... BTW, the ART-13 dynamotor is the exact one that
goes there, sans the mount, of course, and the bolt holes match up 100%.

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Old January 9th 06, 02:00 PM posted to rec.radio.amateur.boatanchors
Litzendraht
 
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Default Collins 18 S-4

I can't seem to post on Google, so I'll try it here on Talkabout.

Fred mentioned in his first post that the dynamotors had been removed from
both of his units.

When I looked at the pictures in this 18S instruction manual, the first
thing I noticed were the 811's and mod transformer. They look like they
were lifted from an ART-13 as well.

John

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Old January 8th 06, 10:21 PM posted to rec.radio.amateur.boatanchors
K3HVG
 
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Default Collins 18 S-4

That's absolutely correct. They (Collins) used as much of the existing
ART-13 parts, it appears, as possible. Seems like the thing to do,
given the design task at hand. Its just too bad they designed it with
plug-in components. At the time, though, 20 channels was quite
sufficient the HF aeronautical service. And, if you ever see one of the
ART-13's with the Comco crystal oscillator in it, that was the original
attempt to get a satisfactory rig for both the military and the
airlines. I've tried to find out how many years the ART-13 was use by
the airlines, but no joy. When I worked for Page Airways FBO (DCA) in
the mid-60's, they had the books for the Comco ART-13A and the souped-up
ARC-1 VHF set. It appears that the ART-13 was considered unusable
somewhere about 1955, although my ATC came from Moffed Field and had a
NASA channelization chart with a 60's date on it. I still notice ads in
50's and early 60's QSTs for the surplus dealers trying to buy-up
ART-13s and BC-348s. Maybe for the 3rd world? Maybe NASA pushed the
date on mine?? Probably why it still works so well...hi!!!

Litzendraht wrote:
I can't seem to post on Google, so I'll try it here on Talkabout.

Fred mentioned in his first post that the dynamotors had been removed from
both of his units.

When I looked at the pictures in this 18S instruction manual, the first
thing I noticed were the 811's and mod transformer. They look like they
were lifted from an ART-13 as well.

John


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Old January 9th 06, 01:53 AM posted to rec.radio.amateur.boatanchors
Litzendraht
 
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Default Collins 18 S-4

Jeep,
I too recall the adds in QST and CQ from commercial companies
looking for 348's and ART-13's. I always figured that stuff was
destined for South America. Also, I knew an old timer that worked for
an exploration division of Magnolia Petroleum, and he worked with
BC-312's and 348's and even a Hallicrafters HT-9 transmitter. All of
this stuff was really considered obsolete in the early Sixties, but I
guess it proved reliable and was used for some form of field
communications.
I mentioned earlier that my father was a field engineer for Collins
from '52 to '55 and worked with the 18S and 180L tuner. I was a kid
back then 8 or 10 years old, and I still remember being intrigued with
the 18S receiver when he told me it had no B+ supply, but used 28 volts
for plate voltage.
John



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Old January 8th 06, 10:31 AM posted to rec.radio.amateur.boatanchors
Litzendraht
 
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Default Collins 18 S-4

In Fred's first post, he mentioned that the dynamotors had been
removed.

When I first looked at a topside view of the 18S in the instruction
book, the 811's and mod transformer sure look like they came from an
ART-13 as well.

John

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Old January 8th 06, 05:27 PM posted to rec.radio.amateur.boatanchors
Litzendraht
 
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Default Collins 18 S-4

Fred did mention in his first post that the dynamotors had been removed
from his two units.

When I saw the pictures of the 18S in this instruction manual, I
immediately noticed the 811's and mod transformer. They look as if they
were lifted from an ART-13 as well.

John

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Old January 8th 06, 06:25 AM posted to rec.radio.amateur.boatanchors
Litzendraht
 
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Default Collins 18 S-4

I hope this is not a double post, but I've waited 8 hours and have seen
nothing.

Fred mentioned on his first post that the dynamotors had been removed
from his two 18S units.
When I saw illustrations in this instruction manual, the first thing I
saw in a top view of the unit were the 811's and mod transformer. They
certainly appear to be lifted from an ART-13 as well.

It's been a long time ago, but my father told me about the 18S receiver
and the fact that only 28 volts were used on the plates and screens. I
was just a kid of 9 or 10 years old. Even back then I knew that most
radios needed a hundred volts or so. Even the "All American Five"
series string AC/DC sets had better than 100 volts B+.

John

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