ARRL East Bay Section

Special Guest Speaker at Hornet Amateur Radio Club June Meeting

Posted by af6aq on May 11th, 2009

Reflections: Marconi and Ionospheric Propagation


By Bart Lee, KV6LEE, xWPE2DLT, CHRS, AWA
San Francisco , California USA : KV6LEE@att.net

Marconi sent three dots, the letter “S”, across the Atlantic by wireless in
December, 1901. Or did he?

I had checked the sunspot numbers for December 1901 and discovered (for the first time as far as I know) that that number was exactly zero. The fly in this ointment is that propagation models do not permit Marconi to get across, or the AM skip either for that matter. Marconi didn’t trust experts, and the models may not be as good as one would hope.

Was there D-layer absorption that would prevent Marconi’s signals from reaching the F-layer and skipping across the pond?

The Hornet Amateur Radio Club invites you to come and join us on Saturday June 13th and hear Bart’s story about Marconi. 

We start at noon aboard the USS Hornet museum ship docked in Alameda .  Directions to the ship http://www.uss-hornet.org/visit/car/ .  We want to make sure we have a big enough room for this popular event so please RSVP and let us know you are coming.  NB6GC_Members@yahoogroups.com.  Go to the center gangway and tell them you are a visitor to the radio club and ask for directions or we will meet you at the entrance.  Tour the ship after the meeting and save $14.

73,

HARC