[Milsurplus] Armstrong Days at InfoAge

[Al Klase]

Gene,

There aren't any pictures or hard info on exactly what Armstrong was 
using at that point.  There's a excerpt from Sarnoff's report at the 
bottom of the webpage referenced below.  The reports to Marconi from 
Sarnoff and Roy Weagant are pretty informative.  I'll try to break loose 
the whole thing.

Coherers were obsolete by this time.  This was double-tuned crystal set 
versus regen.  We have an analog of the Armstrong circuit running in the 
Museum receiving a simulated spark signal.  The sounds of a regen going 
into oscillation on a spark signal are not what you'd expect.  There's 
no carrier and so no bloop.

In the reports, Clifden refers to the Marconi spark station in Ireland.  
The crystal set could not hear CW stations, but Armstrong and Sarnoff 
were able to hear the Poulsen ARC CW stations in San Fransisco and 
Hawaii, and the Telefunken station in Nauen Germany, an alternator, on 
Armstrong's rig.  The commercial CW stations at that time were using 
really awful receivers, mechanical tickers etc., so hearing them at 
those distances was really impressive.

Come hear this stuff yourself.  I'll try to get more on the web after 
the event.

Al Klase - N3FRQ
The Radio Technology Museum
http://www.rtm.ar88.net/




On 1/16/2014 2:19 PM, Gene Smar wrote:
> Al et al:
>      We in the know understand the significance of regen vs coherer 
> receivers.  But what did Armstrong demostrate to the assembled crowd?  
> Is there any lab-type document from Armstrong that goes through his 
> demo step by step?
>      I ask because I can't imagine what a listener like Sarnoff or 
> Weagant might have seen or heard during the demo that would have 
> convinced them that regen was the greatest thing since sliced bread.  
> Might be something to ask about at the event on 30 Jan.  Thanks for 
> the info but I can't attend.
> 73 de
> Gene Smar  AD3F
> On 01/16/14, Al Klase<ark at ar88.net> wrote:
> Armstrong Fans;
>
> On the night of 30 January 1914, Edwin Howard Armstrong, accompanied by
> Professor Morecroft from Columbia University, demonstrated his
> regenerative receiver to David Sarnoff and Roy Weagant of The American
> Marconi company at the Belmar receiving station, then under
> construction. Join us at InfoAge in Wall Township, New Jersey on 8 or 9
> February 2014 to commemorate the 100th anniversary of the historic event.
>
> Get the details: http://www.rtm.ar88.net/Armstrong_Days_at_InfoAge.html
>
> See you there,
> Al
>
> -- 
> Al Klase -- N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/