Thread: Antenna Simulation in LTspice
View Single Post
  #21   Report Post  
Old March 8th 13, 04:32 PM posted to sci.electronics.design,rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Jeff Liebermann[_2_] Jeff Liebermann[_2_] is offline
external usenet poster
  
First recorded activity by RadioBanter: Jun 2007
Posts: 1,336
Default Antenna Simulation in LTspice
On Thu, 07 Mar 2013 11:39:45 -0800, Jeff Liebermann
wrote:

Fortunately, WWVB is on-off
keying with no amplitude component, so there's no incentive to add an
AGC controlled input amplifier in order to maximize the A/D converters
dynamic range.

Oops. WWVB does have an amplitude component and is not quite on-off
keying (OOK). There's a -17dB drop in RF signal level at the
beginning of each 1 second marker pulse. It was -10dB prior to 2005.
http://en.wikipedia.org/wiki/WWVB#Modulation_depth




--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Reply With QuoteReply With Quote