[600MRG] TM1LY and TM100LY Lafayette Stations on the Air.

[D.J.J. Ring, Jr.]

You're correct Denny, the radiation comes from the towers.

Just like on ships, we had a 100 foot span to a 50 foot high king post on
main deck from the upper deck where the exit trunk from the radio room was,
the wire from the antenna trunk to the horizontal wire was about eight (8)
feet.  It was that 8 feet that did the radiating, nothing from the 100 foot
span of heavy wire. Same with this French station - and Grimeton Radio /
SAQ in Sweden, the lead wire to the first tower is what radiates! So you
have about 360 feet of radiating wire to the first tower, that's where
nearly all the radiation comes from.

73
DR
N1EA


On Fri, Dec 18, 2020 at 11:21 PM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> The low wavelength likely means the big top hat is not taking part
> directly in radiation to any degree.  It's essentially omni in azimuth.
> However, the top hat would have been effective in elevating the current
> profile in the vertical radiator which would have improved efficiency.
>
> Denny
>
> On Fri, Dec 18, 2020 at 4:47 PM D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
>
>> Do you have Thorn Mays' book, "Wireless communication in the United
>> States : the early development of American radio operating companies."?
>>
>> You - and others - would enjoy it, it was written by Thorn, W6VX and
>> prepared by Arthur Goodnow, W1DM and Robert Merriam, W1NTE of the  New
>> England Wireless & Steam Museum <https://newsm.org/>   in Rhode Island.
>>  They sell copies but their web site has no shopping cart.
>> https://newsm.org/shop/
>>
>> Book
>>
>> Wireless Communication in the United States
>> The Early Development of American Radio Operating Companies
>> *by Thorn L. Mayes*
>>
>> [image: Thorn Mayes book cover]Thorn L. Mayes was an electrical engineer
>> who grew up in the time he wrote about. He knew wireless and many of the
>> people who developed it. The book is a factual account of alternators, arcs
>> and sparcs, and coherers, barretters and tikkers! It tells of great
>> engineering achievements. It describes unscrupulous stock promotions that
>> by chance yielded some technical breakthroughs.
>>
>> This book covers the glory days of high powered wireless, three hundred
>> thousand watt spark transmitters, one million watt arc transmitters, and
>> the mighty Alexanderson alternators with antennas as long as nine
>> miles–systems that gave dependable world wide radio communication over
>> seventy years ago–as well as the business history of early radio.
>>
>> The appendix includes fresh opinions from excerpts of unpublished letters
>> of pioneers, and early drawings of well designed, quenched gap spark
>> transmitters, which are far more than the blunderbuss static generators
>> that they have been taken for.
>>
>> 73
>> DR
>>
>>
>> On Fri, Dec 18, 2020 at 7:24 PM Bart Lee <kv6lee at gmail.com> wrote:
>>
>>> DR, A photo at the bottom right shows the antenna for the megawatt arc
>>> at Bordeaux circa 1920+.  It looks like a radiating vertical lead system, a
>>> narrow "V" --  into the leading edge of a large rectangular capacity hat,
>>> like a Marconi "T" but spread out. So the towers look to be isolated from
>>> ground and so did not radiate. The direction of emission would be to the
>>> observer (and camera). For U.S. Mid-Atlantic (*e.g.*, Annapolis, MD),
>>> the direction would be East-NorthEast of Bordeaux (great-circle). This
>>> could be verified if there were a lay-out map available of the transmitter
>>> and antenna, but that's what it looks like in the small diagram. There had
>>> to have been a very large ground-screen under the antenna system.
>>>
>>> 73 de Bart, K6VK ##
>>> -- --
>>> Bart Lee
>>>
>>> Texts only to: 415 902 7168
>>>
>>> www.bartlee.com
>>>
>>> {KV6LEE(at)gmail(dot)com} ##
>>>
>>> <http://www.LawForHams.com>
>>>
>>>
>>>
>>> On Fri, Dec 18, 2020 at 3:39 PM D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
>>>
>>>> Hello Bart,
>>>>
>>>> You didn't ask this question but I'm answering it again.***
>>>>
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>>>
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