[GreenKeys] GreenKeys Digest, Vol 97, Issue 31
James Bloomfield
rn23crna at windstream.net
Sun Feb 19 07:43:38 EST 2012
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Sent: Saturday, February 18, 2012 10:04 PM
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Subject: GreenKeys Digest, Vol 97, Issue 31
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Today's Topics:
1. Lenkurt 25B (Larry Tighe)
2. Re: Lenkurt 25B (Charles Ring)
3. Re: Lenkurt 25B (Jim Haynes)
4. 1939 Commercial RTTY? (dmm at lemur.com)
5. Re: Lenkurt 25B (Larry Tighe)
6. Re: 1939 Commercial RTTY? (Jim Haynes)
7. 1939 Commercial RTTY? (David Burns)
8. Re: need manual for FLESHER TU-170 and any hints andstories
(COURYHOUSE at aol.com)
9. Re: need manual for FLESHER TU-170 and any hints andstories
(COURYHOUSE at aol.com)
10. Re: Fwd: The Flying White House 1947 (Duncan Brown)
----------------------------------------------------------------------
Message: 1
Date: Sat, 18 Feb 2012 16:08:48 -0500
From: "Larry Tighe" <larryradio at att.net>
Subject: [GreenKeys] Lenkurt 25B
To: "Greenkeys Greenkeys" <greenkeys at mailman.qth.net>
Message-ID: <F6EB748C5E75450884D75647E868C6FF at d2400>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
Howdy Boys and Girl,
Just got some very nice Lenkurt units. Looking for copies of the
Lenkurt
Model 25B prints if they're out there and available.
Any help is appreciated,
Lar
------------------------------
Message: 2
Date: Sat, 18 Feb 2012 16:21:17 -0500
From: Charles Ring <w3nu at roadrunner.com>
Subject: Re: [GreenKeys] Lenkurt 25B
To: greenkeys at mailman.qth.net
Message-ID: <4F40164D.8010004 at roadrunner.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I don't have any prints but I have two UPI 25B's. I've kept them as
really good loop supplies with terminal 6 (control) grounded to 3. Are
they useful for anything else now?
73 de W3NU
On 2/18/2012 1608, Larry Tighe wrote:
> Howdy Boys and Girl,
>
> Just got some very nice Lenkurt units. Looking for copies of the
Lenkurt
> Model 25B prints if they're out there and available.
>
> Any help is appreciated,
>
> Lar
>
------------------------------
Message: 3
Date: Sat, 18 Feb 2012 15:27:00 -0600 (CST)
From: Jim Haynes <jhhaynes at earthlink.net>
Subject: Re: [GreenKeys] Lenkurt 25B
To: Charles Ring <w3nu at roadrunner.com>
Cc: greenkeys at mailman.qth.net
Message-ID: <alpine.LFD.2.02.1202181526190.8077 at Frances.localdomain>
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
Well they would be useful as narrow FSK demodulators - probably the
shift
is 85Hz, and we've never had much luck getting the hams to use
anything
below 170.
------------------------------
Message: 4
Date: Sat, 18 Feb 2012 15:41:32 -0600
From: dmm at lemur.com
Subject: [GreenKeys] 1939 Commercial RTTY?
To: greenkeys at mailman.qth.net
Message-ID: <201202182137.BEH61236 at rg7.cniteam.com>
I got a query from a writer who must have seen something about
teletypes on my website. He asked, first, if it would be historically
accurate to have a shipping company in 1939 use a Teletype;
the answer to that is clearly yes. He then asks if, specifically,
they might receive things such as manifests from ships (presumably
at sea) via (radio)teletype? Technically this was possible, of
course,
but I don't know if it was then (1939) standard practice. Was it?
Regards,
David M.
===
Dr. David M. MacMillan - dmm at lemur.com
The first rule of intelligent tinkering is to save all the parts.
- Paul Ehrlich (1854-1915); Aldo Leopold
www.CircuitousRoot.com * www.LemurType.com * www.Lemur.com
------------------------------
Message: 5
Date: Sat, 18 Feb 2012 17:11:03 -0500
From: "Larry Tighe" <larryradio at att.net>
Subject: Re: [GreenKeys] Lenkurt 25B
To: "Charles Ring" <w3nu at roadrunner.com>, <greenkeys at mailman.qth.net>
Message-ID: <8CF650217DE649B1ABAE3601AFCAB749 at d2400>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I dunno how useful they are.....I'm just using these for "in house
network"
toys. No loop contol with these, just RS 232 in/out of the 25 pin
connector. Seperate connector for audio in and out. I tie 4 and 5
together
to make them play :>)
I plan on using a ST 8000A to drive them and receive from them also.
lar
----- Original Message -----
From: "Charles Ring" <w3nu at roadrunner.com>
To: <greenkeys at mailman.qth.net>
Sent: Saturday, February 18, 2012 4:21 PM
Subject: Re: [GreenKeys] Lenkurt 25B
>I don't have any prints but I have two UPI 25B's. I've kept them as
> really good loop supplies with terminal 6 (control) grounded to 3.
Are
> they useful for anything else now?
>
> 73 de W3NU
>
>
> On 2/18/2012 1608, Larry Tighe wrote:
>> Howdy Boys and Girl,
>>
>> Just got some very nice Lenkurt units. Looking for copies of the
Lenkurt
>> Model 25B prints if they're out there and available.
>>
>> Any help is appreciated,
>>
>> Lar
>>
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------------------------------
Message: 6
Date: Sat, 18 Feb 2012 16:17:04 -0600 (CST)
From: Jim Haynes <jhhaynes at earthlink.net>
Subject: Re: [GreenKeys] 1939 Commercial RTTY?
To: dmm at lemur.com
Cc: greenkeys at mailman.qth.net
Message-ID: <alpine.LFD.2.02.1202181549140.8130 at Frances.localdomain>
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
I don't know, and I wish I did, so I'm hoping someone who knows will
answer the question.
Something that seems to have been used quite a bit, and I don't know
much about, is the use of high speed Morse, with transmission from
punched tape at speeds up to 500 wpm and reception on an ink recorder.
Then the inked tape was passed to multiple operators to transcribe
with
typewriters. I remember reading somewhere that RTTY was not very
attractive by comparison, being limited to 60 wpm or so. When they
developed effective multiplexing than RTTY could begin to compete with
high speed Morse, since it replaced all those receiving operators.
Press Wireless seems to have been an early adopter of RTTY. RCA was
using RTTY with a 3 out of 7 code for error detection in the 1930s,
but this was probably on point-to-point circuits. I have an article
titled "Teletype Now used on Radio Circuits to Hawaii by R.C.A.
Communications, Inc. for All Its Messages" dated October 1, 1932.
I suspect there was little if any use of RTTY on ships until 1945 or
so.
There were experiments done long before, but putting Teletype machines
on
ships for operational use would have lots of limitations. You need
somebody trained to repair the machines, and a stock of spare parts;
because you probably aren't going to find that in random ports around
the world. Machines like the Model 15 did not do well on ships
because
of that massive carriage assembly getting slung around as the ship
pitches or rolls. That's why the U.S. Navy got the entire output of
Model 28 equipment in the beginning. Since a ship has to keep a radio
operator on board anyway, you might as well use him as a Morse
operator
until the volume of traffic gets too high.
------------------------------
Message: 7
Date: Sat, 18 Feb 2012 17:32:08 -0500
From: David Burns <dvdbrns at rcn.com>
Subject: [GreenKeys] 1939 Commercial RTTY?
To: greenkeys at mailman.qth.net
Message-ID: <4F4026E8.8050804 at rcn.com>
Content-Type: text/plain; charset="iso-8859-1"
My speculation would be that it is highly unlikely, but these folks
would know for sure:
Maritime Radio Historical Society <http://www.radiomarine.org/>.
-Dave in Boston
I got a query from a writer who must have seen something about
teletypes on my website. He asked, first, if it would be
historically
accurate to have a shipping company in 1939 use a Teletype;
the answer to that is clearly yes. He then asks if, specifically,
they might receive things such as manifests from ships (presumably
at sea) via (radio)teletype? Technically this was possible, of
course,
but I don't know if it was then (1939) standard practice. Was it?
Regards,
David M.
===
Dr. David M. MacMillan -dmm at lemur.com
<http://mailman.qth.net/mailman/listinfo/greenkeys>
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Message: 8
Date: Sat, 18 Feb 2012 21:38:37 -0500 (EST)
From: COURYHOUSE at aol.com
Subject: Re: [GreenKeys] need manual for FLESHER TU-170 and any hints
andstories
To: rmowery28146 at earthlink.net, GreenKeys at mailman.qth.net
Message-ID: <6507e.1737874d.3c71baac at aol.com>
Content-Type: text/plain; charset="us-ascii"
manual recved! MANY THANKS! very nice... I can read it! most of
the
other one was missing so I gig not realize this came in kit
form.... it
will be interesting to see how good it is when it gets in
here!
Ed#
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Message: 9
Date: Sat, 18 Feb 2012 21:49:45 -0500 (EST)
From: COURYHOUSE at aol.com
Subject: Re: [GreenKeys] need manual for FLESHER TU-170 and any hints
andstories
To: COURYHOUSE at aol.com, rmowery28146 at earthlink.net,
GreenKeys at mailman.qth.net
Message-ID: <658d0.34966681.3c71bd49 at aol.com>
Content-Type: text/plain; charset="us-ascii"
any idea how this unit stacks up with other tu's? I am all
ears!
Ed#
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Message: 10
Date: Sat, 18 Feb 2012 22:03:09 -0500
From: Duncan Brown <duncanancy at earthlink.net>
Subject: Re: [GreenKeys] Fwd: The Flying White House 1947
To: greenkeys at mailman.qth.net
Message-ID: <4F40666D.8080201 at earthlink.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I just received the original photo from Don - it is going to the AWA
Museum. Looking at the photo with a magnifying glass, I can see a
little more detail than was available on the scans.
The unit behind the operator's head is definitely a diversity FSK
receiving converter. I can make out the meter switch markings and
they
are things like "Chann B"; "Chann A + B"; "Polar"; "Neutral"; etc. I
was then able to identify the converter as of the FRF & CV-31/TRA-7
family (although a slightly different configuration).
Below the CV-31 is a BC-348 receiver (must have been another one
unless
they were using one of the ARC-5 receivers for diversity).
Below the BC-348, I can just make out another chassis with a large
shiny
dial. This might be the FSK modulator - something like the O-79/TRA-7
used (along with the CV-31) in the AN/MRC-2 in this time period (and
later in the early AN/GRC-26s). So maybe the ART-13 was running true
FSK (but where is the other coax - on the other side of the ART-13?)
In looking up the O-79, I came across an interesting document:
"Military
Teletypewriter Systems of World War II" at
http://www.nonstopsystems.com/radio/article-AIEE-1948.pdf
(I was surprised to learn that there was some Multi-Channel,
Independent
Sideband, radio teletype used on high volume circuits during WWII and
that the Bell system had been using it prior to WWII.)
On the front of the SIGNIN, between the keyboard and paper tape reel
is
something that looks like a perforated tape reader. So there must
have
been an "Iron Horse"/GPE perforator somewhere.
Have fun,
Duncan
------------------------------
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