If Franklin used his setup to communicate over a distance with a second
point, then I agree with you. But I am unaware of him ever doing that. I'm
not an expert on history but I do enjoy reading old articles about the
beginning of our hobby and I never read anything to that effect about
Franklin.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of John
Sent: Tuesday, February 25, 2014 12:55 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] In praise of older technology
Rick,
Not trying to start something.....but....The only difference between us
and Franklin is frequency and power. At least those of us with verticals.
John
WA1JG
On 2/24/2014 3:27 PM, Rick - DJ0IP / NJ0IP wrote:
> Doug, I think you've been hanging out with Mahlon Loomas too long!
>
>
>
> And for those of you who can't remember who he was, it might be worth
> your while to look it up.
>
>
>
> I bet most of you didn't even know that wireless communications was
> invented by a DENTIST!
>
>
>
> Yes, he also invented the very first Aerial, although some might argue
> it was Benjamin Franklin.
>
> Franklin only used the kite wire to capture electricity; Loomas used
> it as an Aerial to send and receive signals.
>
> http://en.wikipedia.org/wiki/Mahlon_Loomis
>
>
>
> Though his patent for a wireless telegraph was in 1872, as I recall he
> discovered this about 4 years earlier. Hard to remember exactly. I
> was just a young whipper snapper back then.
>
>
>
> So guys, take it from me; next time you're having problems with your
> antenna, don't ask an engineer, consult your dentist!
>
> Hey, I oughta know... I work for an antenna company!
>
> ;-)
>
>
>
> What does all of this have to do with Doug's comment?
>
> Everything.
>
> Mahlon discovered that if he made the length of the wire of the TX and
> RX aerial the exact same length, communications was much more
> reliable. Thus you might conclude that the length of wire was determining
the frequency.
>
>
>
> But that's not quite accurate.
>
> Actually it was transmitting on (almost) all frequencies, but only
> efficiently radiating into the ether on the wavelength associated with
> the length of his aerial. So specifically, the aerial, not the
> transmitter, determined the frequency being radiated into the distant
> ether. In the near field, a broad frequency spectrum was being radiated.
>
>
>
> ... at least that's my understanding of what was happening.
>
> Then again, how would I know?
>
> I'm neither an engineer nor a dentist!
>
>
>
> 73 - Rick, DJ0IP
>
> (Nr. Frankfurt am Main)
>
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Doug
> Reid Back when I started out, we used a spark generator and the
> frequency was determined by the length of our antenna......
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|