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Alpha
Nov 27, 2006, 11:52 AM
L.O.R.A.N Tower ( http://www.skyscraperpage.com/cities/?buildingID=1046 )

This mast is used today not for LORAN-C transmission anymore. It is today used by Iceland Broadcasting Company ( Ríkisútvarpið )for broadcasting on
the longwave frequency 189 kHz with a transmission power of 300 kW.
Its adress is Hellissandur/Gufuskálar

Give as further names for this tower therefore:
Hellissandur LORAN-C transmission mast
Hellissandur longwave transmission mast
Gufuskálar longwave transmission mast
Native: Langbylgjustöðin á Gufuskálum


LORAN-C Transmission Mast Port Clarence
LORAN-C Transmission Mast Port Clarence ( http://www.skyscraperpage.com/cities/?buildingID=54928 )

Year of built: 1961

Minami Torishima LORAN-C Transmission Mast
Minami Torishima LORAN-C Transmission Mast ( http://www.skyscraperpage.com/cities/?buildingID=56828 )

Year of built: 1964
Dismantled in 1993


Iwo Jima LORAN-C Transmission Mast
Iwo Jima LORAN-C Transmission Mast ( http://www.skyscraperpage.com/cities/?buildingID=56827 )

Year of built: 1963
Change name of Iwo Jima LORAN-C Transmission Mast to Iwo Jima LORAN-C Transmission Mast (old)

------------------------
Official sources: (see below)
Unofficial sources:

Building Name: Iwo Jima LORAN-C Transmission Mast (new)
Native Name:
Other Names:
Address:
City: Iwo Jima Island
Postal Code:
State/Province: Tokyo Prefacture
Country: Japan
Official Building Website URL:
Skyscrapers.com (Emporis.info) URL:
Architect:
Interesting Facts/Records (in own words): Iwo Jima LORAN-C Transmission Mast (new) was built as replacement of Iwo Jima LORAN-C Transmission Mast (old).
In 1993 it was dismantled, after Iwo Jima LORAN-C was shut-down


Heights--

PLEASE PROVIDE SOURCES FOR HEIGHTS, OTHERWISE WE WILL ASSUME THEY ARE ESTIMATES.
- antenna: 411.5 metres
- spire:
- roof:
- top floor:
- other heights:

Current Building Status (Built, Proposed, Canceled, Destroyed, etc...): Destroyed

Construction Dates--
- started: 1965
- finished: 1965
- destroyed: 1993


Above ground floors:
Below ground floors:
Floor-to-floor height:
Gross Floor area:
Elevator count:
Unit count: 1

Structure Type(s): Guyed Mast
Building Use(s): Communication
Building Style(s):
Building Materials:
------------------------


Cape Race LORAN-C Transmission Mast
Cape Race LORAN-C Transmission Mast ( http://www.skyscraperpage.com/cities/?buildingID=56824 )
Year of built: 1966
Collapse in February 1993
Change name of Cape Race LORAN-C Transmission Mast to Cape Race LORAN-C Transmission Mast (old)

----------------------
Official sources:
Unofficial sources: http://www.varcon.ca/OurExperience/SampleProjects.html

Building Name: Cape Race LORAN-C Transmission Mast (new)
Native Name:
Other Names:
Address: Cape Race
City: Portugal Cove South
Postal Code:
State/Province: Newfoundland and Labrador
Country: Canada
Official Building Website URL:
Skyscrapers.com (Emporis.info) URL:
Architect:
Interesting Facts/Records (in own words): Second tallest structure of Canada. Built in 1993 as replacement of Cape Race LORAN-C Transmission Mast (old)
Mast is used for a high-power (1800 kW) LORAN-C transmitter, which may be the most powerful transmitter of Canada. This transmitter is a very important radio navigation aid for ships and aircraft in the Northern Atlantic.

Heights--

PLEASE PROVIDE SOURCES FOR HEIGHTS, OTHERWISE WE WILL ASSUME THEY ARE ESTIMATES.
- antenna: 410 metres ( 1345 ft)
- spire:
- roof:
- top floor:
- other heights:

Current Building Status (Built, Proposed, Canceled, Destroyed, etc...): Built

Construction Dates--
- started: 1993
- finished: 1993
- destroyed:


Above ground floors:
Below ground floors:
Floor-to-floor height:
Gross Floor area:
Elevator count:
Unit count: 1

Structure Type(s): Guyed Mast
Building Use(s): Communication
Building Style(s):
Building Materials: Steel
------------------------



Source: e-Mail from "Bill Dietz" <bdietz57@hotmail.com>, former employee of US-Coast Guard



Good morning Mr. Mueller,

>From records, there were only very few Loran C transmission towers of that
height in operation.

Port Clarence, Alaska - Dec 1961 - still in operation
Cape Race, Newfoundland - 1966 - tower failure 2/93 - replaced with unknown
but not 1350ft
Iwo Jima, Japan - 1963 - 1st tower fell - 2nd destoryed in 1993
Marcus Is, Japan - 1964 - tower destoryed in 1993
Sandur, Iceland - 9/1963
Yap - 1964 - 1000ft tower - 1st tower fell during construction. 1987 Loran
C creased transmissions from Yap.

I hope that helps.

Bill

LMich
Nov 28, 2006, 1:15 AM
I changed most everything, but did not add the last one. Questions:

1. Mr. Dietz clearly states the the Cape Race tower was replaced, but not by a tower of 1,350 feet in height. Being that this is an antenna where height is much more important than other structures, until you find the current height I can't add it.

2. What is your source for the height of the new (but now demolished) Iwo Jim mast?

3. Lastly, when was the email recieved? It's always good to include dates with sources like this.

Alpha
Nov 28, 2006, 11:09 AM
1. Source of height of new tower of Cape Race LORAN-C transmitter:

http://www.varcon.ca/OurExperience/SampleProjects.html

There text passage:

Canadian Coast Guard - Engineering inspections of Loran C towers at Cape Race, NF (1345'), Comfort Cove, NF (623'), Port Hardy, BC(499'), Williams Lake, BC(627').


I understand the height 1345 ft as height of new tower, because at the same text, you can read also on some lines above.


Canadian Coast Guard - Cape Race, Newfoundland. Failure investigation of 1380' Loran C tower.


This shows also that the old tower at Cape Race was not dismantled, but collapsed in a catastrophical way.


2. I asked him, where LORAN-C masts taller than 300 metres exist or existed. If the tower was rebuilt with less height and he knew it, he would have told me it in his answer.

3. I got the e-Mail from November 26th, 2006.

LMich
Nov 28, 2006, 11:22 AM
So, the original tower was 1380 feet in height, and the new one is 1345 feet in height? What about the 1350 feet tall listed on Structurae.en and the 1961 completion date? Is it possible that Structure.en has the height right for the second one?

As for the second question I asked you, if he told you the height of the second Iwo Jima mast, why does it not show in his email? If he didn't tell you, what is the source of the height? I can't add it until I know the source.

Alpha
Nov 28, 2006, 2:24 PM
The tower completed in 1961 is that of Port Clarence ( http://www.skyscraperpage.com/cities/?buildingID=54928 , http://en.structurae.de/structures/data/index.cfm?ID=s0013990 ).
Structurae database does not contain so far Cape Race LORAN-C transmitter, either the old nor the new mast.

However, there is a further correction for Minami Torishima LORAN-C Transmission Mast ( http://www.skyscraperpage.com/cities/?buildingID=56828 ). This tower was not dismantled in 1993. It was dismantled in 2000. Change also the name of the structure to Minami Torishima LORAN-C Transmission Mast (old), because in 2000 a new mast was built.
In 1993 the authority for the facility was transfered to Japan Coast Guard.

Source: iwao-mabuchi@kaiho.mlit.go.jp , an employee of Japan Coast Guard:


Dear Mr. Mueller

Thank you for sending mail to us.
On your question, there is still a LORAN-C transmitter on Minami-Torishima, YES.
We Japan Coast Guard succeeded operation LORAN-C from USCG in Oct. 1993.
The mast was renewed in 2000, and it is 213 metres tall now.


Best regards

LCDR Iwao Mabuchi

Policy evaluation and Public relations office
Japan Coast Guard

LMich
Nov 29, 2006, 2:29 AM
That makes it sound as if the mast was simply added onto instead of demolished and a new tower constructed. Do we know for sure that this mast was completely taken apart, and that a new one was built in its place instead of a vertical expansion of the original tower?

*EDIT* I added the new tower, but, again, I need the date of the email. Please be sure to add this whenever you have sources through emails.