Re: [Radio Officers, &c] Titanic Radio Room gear. What is known about the technical parameters and dimensions, feeder system of the Titanic

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g4jht

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Mar 11, 2020, 12:37:17 PM3/11/20
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I have come in on this fairly late but have a couple of questions that
may have been asked previously.

What is known about the aerial/antenna arrangement of the Titanic and
the lead-in/feeder setup?
Also the technical properties of it aerial(s) , capacitance and
radiation resistance, meter-amp rating (probably to early for that) or
the physical dimensions needed to take a shot at calculating electrical
properties.

73,
   Dave in Ireland.

D.J.J. Ring, Jr.

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Mar 11, 2020, 1:35:18 PM3/11/20
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Hello Dave,

Doing some research on early aerials like Titanic used, I found that
they were usually parallel wires but some coast stations tried
"zig-zag" type of wires.

That is wires running from the origin to the end of the flat top,
going down a 30 cm (aprox. one foot) and then running the wire back to
the origin, but when reaching the origin, again going down 30 cm (1
foot) and then continuing outward again towards the end, making one
continuous wire but zig-zagging instead of parallel wires.

This was known to increase the radiation resistance. I have a 1930
Bern book of ships, and I believe Olympic was still listed, ships were
given with antenna current measurements.

I'll take a look.

73

DR
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Jerry Proc

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Mar 11, 2020, 2:17:01 PM3/11/20
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Information on Titanic's antennas can be found here.
http://www.halifax-arc.org/pdf/TitanicRadio1.pdf
To view this discussion on the web visit https://groups.google.com/d/msgid/radio-officers/CADO5Rbgf88_yzULBRgFaT3%3DJKZ1NvgCT5D%2Bkj11ANO_m5kDdmg%40mail.gmail.com.

ps parksstephenson.com

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Mar 11, 2020, 3:15:23 PM3/11/20
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I’ve got a little more information at home, but that should be good enough. Just know that the physical length of the antenna was calculated to match the electrical length required for the 300- and 600-meter wave, the two frequencies normally used.  

Parks
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Subject: RE: [Radio Officers, &c] Titanic Radio Room gear. What is known about the technical parameters and dimensions, feeder system of the Titanic
 

Lawrence Cohen

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Mar 11, 2020, 5:51:24 PM3/11/20
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My reading left me with the impression that while roughly resonant, the parallel wires acted as a capacitance hat.  Did most of the signal radiate from the vertical feeds?   
Larry
WA2TRJ

D.J.J. Ring, Jr.

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Mar 11, 2020, 6:06:19 PM3/11/20
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Yes, they do, just like on our ship installations, the vertical
antenna trunk and the linking wire to the top wire is the main
radiator and the horizontal section is loading to resonate the Antenna
Trunk (usually a conductive structure inside a non-conductive
container - mine was about 8 feet high, then maybe another 10 feet of
heavy phosphor bronze wire to the top section.

73

DR
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ps parksstephenson.com

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Mar 11, 2020, 6:06:51 PM3/11/20
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Signals radiated down the length of the aerial, as well.  Ships with “T” or (for ships not large enough to make a “T”) “L” shaped aerials, best ranges were realised on bearings that coincided with the direction of the horizontal portion of the aerial (either end).

Parks
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Lawrence Cohen

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Mar 12, 2020, 12:04:21 PM3/12/20
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Lawrence Cohen

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Mar 12, 2020, 12:14:11 PM3/12/20
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Thanks Parks-
One photo of the Titanic at the dock shows some sort of shoot hanging over her side just aft of the anchor on the starboard side.   Wonder if you can identify it. Workers head? Coal bunker shoot? Might be canvass.
Inline image

Larry
WA2TRJ

ps parksstephenson.com

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Mar 12, 2020, 12:15:38 PM3/12/20
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Workers’ head. Poop Shute.

Parks
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Lawrence Cohen

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Mar 12, 2020, 12:19:29 PM3/12/20
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Nothing like luxury accomodations!

ps parksstephenson.com

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Mar 12, 2020, 12:26:03 PM3/12/20
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For some reason, autocorrect changed chute to Shute. Sorry about that.

Parks
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Sent: Thursday, March 12, 2020 9:19:22 AM

Lawrence Cohen

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Mar 12, 2020, 1:48:52 PM3/12/20
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As Shakespeare said:: " A rose by any other name would smell as sweet"
or as Mark Twain said : A person who can only spell a word one way lacks imagination.
Larry


D.J.J. Ring, Jr.

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Mar 12, 2020, 2:08:10 PM3/12/20
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---------- Forwarded message ---------
From: Bill Holly k1bh


I noticed the discussion on antennas for the Titanic and see that the Titanic is using a four wire flat top style antenna. My question for anyone who might know is what is the earliest known use of a flat top style antenna on a ship and is there any reliable references on early maritime antenna development? I have a Antonio Jacobsen oil painting of a late 19th century or early 20th century style steam vessel which shows a faint but unmistakable four wire flat top antenna running from foremast to mainmast. The problem is that it is dated 1896! The painting has passed through at least one major auction house and represented as original and I can see no evidence of tinkering or overpainting of either the vessels image or the date? I’m stumped. I no Marconi planned on using the wireless for maritime use from the beginning and he was experimenting with wireless on vessels early but I don’t see how my painting could be totally original with that date. Any ideas gentlemen?

Bill Holly

K1BH

 

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From: D.J.J. Ring, Jr.
Sent: Wednesday, March 11, 2020 3:51 PM
To: morsecode
Subject: [MorseCode] Fwd: [Radio Officers,&c] Titanic Radio Room gear. What is known about the technicalparameters and dimensions, feeder system of the Titanic

 

 

Readers of Morsecode might like this.

 

73

 

DR

 

---------- Forwarded message ---------

From: Jerry Proc <jerry...@sympatico.ca>

Date: Wed, Mar 11, 2020 at 2:17 PM

Subject: RE: [Radio Officers, &c] Titanic Radio Room gear. What is

known about the technical parameters and dimensions, feeder system of

the Titanic

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