[CW] Woodpecker history

Sat Mar 14 15:29:08 EDT 2020

https://www.bbc.com/reel/video/p0864g3p/the-secret-soviet-radar-hidden-in-chernobyl-s-shadow?ocid
On Thursday, March 12, 2020 D.J.J. Ring, Jr. <cw at mailman.qth.net> wrote:

---------- 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

Sent from Mail for Windows 10

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.proc at 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

To: <radio-officers at googlegroups.com>

Information on Titanic's antennas can be found here.

http://www.halifax-arc.org/pdf/TitanicRadio1.pdf

-----Original Message-----

From: radio-officers at googlegroups.com

[mailto:radio-officers at googlegroups.com] On Behalf Of D.J.J. Ring, Jr.

Sent: Wednesday, March 11, 2020 1:35 PM

To: Radio Officers Google Group

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

known about the technical parameters and dimensions, feeder system of

the Titanic

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

On Wed, Mar 11, 2020 at 12:37 PM g4jht <g4jht at eircom.net> wrote:

> 

> 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.

> 

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