kg6saj
12-23-2004, 12:17 AM
Happy holidays.
I happened across this audio file about a month ago. It was one of those link-from-a-link-from-a-link kind of things. This is the only spark telephony recording that I've come across in searching the internet. [This audio file is also six links off of (K2TQN) John Dilks' old radio and radio history web-site.]
When you click the 'hear' link in the paragraph above fig. 8 on this web-page,
http://www.hammondmuseumofradio.org/spark.html
you should hear a re-creation of what the first "telephony transmission employing spark might have sounded like".
[note -- If the white graphs on a black background are difficult to make out, you will find most of the information duplicated, with black graphs on a white background, here,
http://www.acmi.net.au/AIC/SPARK_SOUNDS.html
however, this page does not have the addendum, and the link above figure 7 is dead.
As an aside, the "Essays Index" link at the bottom of this page has a few dozen history-type links for radio, tape and wire recording, cinema, etc. Even though a few of the links are dead, I found some of the remaining ones quite interesting.]
If you listen to the four spark gap telegraphy recordings (farther up the page) and like what you hear, there are three more that you can play at the bottom of this page,
http://amfone.net/zmspark.html
Reginald Fessenden was an inventor with some 500 patents to his name. Among them was a patent for an electrolytic detector which can be seen here,
http://chem.ch.huji.ac.il/~eugeniik/history/fessenden.html
Another was his electric oscillator (sonar). Picture here,
http://oceanexplorer.noaa.gov/library....ng.html (http://oceanexplorer.noaa.gov/library/readings/subsignaling/media/lowering.html)
The "Library: Readings..." link has a description of how it worked.
And another good web-page by Belrose (VE2CV) that discusses the early history of radio science is at
http://www.ewh.ieee.org/reg....st.html (http://www.ewh.ieee.org/reg/7/millennium/radio/radio_radioscientist.html)
If anyone knows of any other spark telephony recordings, please post the link(s) or information. Your sharing will certainly be appreciated. There are others, besides myself, that would enjoy hearing them.
I wonder what it would have been like to have been there and part of it, when it all began.....if I could get my hands on a time machine, this time period would surely be one of my stops.
73 - Tim - KG6SAJ
I happened across this audio file about a month ago. It was one of those link-from-a-link-from-a-link kind of things. This is the only spark telephony recording that I've come across in searching the internet. [This audio file is also six links off of (K2TQN) John Dilks' old radio and radio history web-site.]
When you click the 'hear' link in the paragraph above fig. 8 on this web-page,
http://www.hammondmuseumofradio.org/spark.html
you should hear a re-creation of what the first "telephony transmission employing spark might have sounded like".
[note -- If the white graphs on a black background are difficult to make out, you will find most of the information duplicated, with black graphs on a white background, here,
http://www.acmi.net.au/AIC/SPARK_SOUNDS.html
however, this page does not have the addendum, and the link above figure 7 is dead.
As an aside, the "Essays Index" link at the bottom of this page has a few dozen history-type links for radio, tape and wire recording, cinema, etc. Even though a few of the links are dead, I found some of the remaining ones quite interesting.]
If you listen to the four spark gap telegraphy recordings (farther up the page) and like what you hear, there are three more that you can play at the bottom of this page,
http://amfone.net/zmspark.html
Reginald Fessenden was an inventor with some 500 patents to his name. Among them was a patent for an electrolytic detector which can be seen here,
http://chem.ch.huji.ac.il/~eugeniik/history/fessenden.html
Another was his electric oscillator (sonar). Picture here,
http://oceanexplorer.noaa.gov/library....ng.html (http://oceanexplorer.noaa.gov/library/readings/subsignaling/media/lowering.html)
The "Library: Readings..." link has a description of how it worked.
And another good web-page by Belrose (VE2CV) that discusses the early history of radio science is at
http://www.ewh.ieee.org/reg....st.html (http://www.ewh.ieee.org/reg/7/millennium/radio/radio_radioscientist.html)
If anyone knows of any other spark telephony recordings, please post the link(s) or information. Your sharing will certainly be appreciated. There are others, besides myself, that would enjoy hearing them.
I wonder what it would have been like to have been there and part of it, when it all began.....if I could get my hands on a time machine, this time period would surely be one of my stops.
73 - Tim - KG6SAJ