[time-nuts] GPS Spoofing
lists at rtty.us
Sun Jul 28 17:30:51 EDT 2013
Actually not the whole story.
Propagating (far field) antennas are also a function of producing the polarization you want and a good field remote from the antenna. For instance, you can get a really good field inside a toroid, but it's not a good far filed (or near field) antenna.
On Jul 28, 2013, at 5:23 PM, Bob Camp <lists at rtty.us> wrote:
> Small antennas (all antennas at 100 KHz are small) are not a matter of wavelengths of wire in the air. They are a matter of making do with what you have. Efficiency is more a matter of coil loss (or equivalent) than of antenna size.
> On Jul 28, 2013, at 5:12 PM, Bob Stewart <bob at evoria.net> wrote:
>> So, given the size of a typical freighter these days, what's so hard about imagining one with enough wire in the air to make that happen for whatever political or commercial reason?
>>> From: Bob Camp <lists at rtty.us>
>>> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>>> Sent: Sunday, July 28, 2013 4:05 PM
>>> Subject: Re: [time-nuts] GPS Spoofing
>>> So in this case we're talking about "horrible" to "even more horrible" in terms of efficiency. I'll freely grant that a 600' tower over a really good ground plane (like say the sea) is going to be way more efficient than anything I'd come up with. The same thing would apply to a matching network made of coils you can stand up inside compared to anything I'd make.
>>> Totally off topic - In the lobby of Continental Electronics they used to have this typical transmitter sitting there. You sort of wondered "why". After looking at it you figured out the little ant down in the bottom was a person. Yes, the coils and "stuff" in Omega transmitters were *big*.
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