• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

The Radio Amateur's Hand Book by A. Frederick Collins

w2xq

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The Radio Amateur's Hand Book
A Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony
1922

Absolutely marvelous reading, available in a variety of formats. (I use the Overdrive app.) Free for the download. Youngsters under 50 probably won't appreciate the beauty of the work.

As an aside, also read Harold Beverage's 1922 QST article "A Wave Antenna For 200 Meter Reception" W2XQ.com : Amateur Radio for the beginning story of a wonderful antenna, if you have the room.

Giddyup.
 

W9BU

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Collins Radio was founded by Arthur Andrews Collins who was born a year after the date on this photo.
 

Lauri-Coyote

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That's quite a photo.... But, but except for the obvious (like the antenna current meter)- I am at a loss to identify any parts of that assembly that would do 'phone in 1908.... Maybe its a form of modulated spark ?..... Is that a bank of light bulbs in series on the wall as a 'power meter' ?

(me thinks that chap is just talking on a landline telephone)

Oh well; rhetorical --- No answers expected

................... I do love historical station photo's, especially ones as technically mysterious as this :)

Lauri :sneaky:
.
 
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ko6jw_2

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Fessenden made the first AM phone transmission in 1906. He used an alternator - not a spark transmission. I don't see a morse key on the table. Or, conditions were bad that day an he was just making a telephone call.
 

Lauri-Coyote

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Fessenden was credit'd with the sending the first meaningful voice transmissions- most notable was his 1906 Christmas Eve broadcast to ships at sea that night. But he used a powerful alternator with a very dangerous modulation system.

RF was passed directly from the alternator thru a carbon element microphone ! to the antenna. Talk about a hot mic !
One of the below pictures shows just such a later "advancement" in that design-- note how far away from the RF source the operator sits. These microphone often carried so much juice they were water cooled.

That 1908 photo show the operator holding a telephone transmitter while listening to something on a ear piece...... I doubt they had duplex in those days.

Still, all in all, it was remarkable what the technology accomplish'd in the pre-lectronic era-- all this was mechanical stuff. Truly Steam Punt- right out of Jules Verne.


8668a.jpg8662a.jpg



Lauri :)
 

Lauri-Coyote

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Oh ! was I in error !

(I am going to blame it on jet lag as I run from plane to plane)

Reginald Fessenden's epic Christmas Eve broadcast was not over an Alternator, but instead on a State-of -the (then)- Art modulated spark transmitter.

What makes my error especially bad is I wrote about this very occasion just last year (October 4th) --wrote it on the observance of his 132th birthday.




Mea Culpa-- Lauri :sneaky:
 
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