[time-nuts] Cutler NAA on 24.0kHz....

[paul swed]

Kenneth on the opamps that is correct.
But I put little U's to indicate phase. They actually represent the top
half of the input cycle.
In the top path it inverts once
The bottom path twice.
So that makes the top 180 out and the bottom in phase with the original.
However the 2 X RC sets the bottom path at I believe 180 degrees from the
input.
The final RC in the top and bottom path account for opamp filter delay and
note they are equal.
So thats has me scratching my head as to how this removes the MSK and
leaves a carrier that can lock.

One of the classic approaches to recover carrier or get rid of BPSK
modulation is to simply double the incoming carrier. Works great if you
don't loose the signal.
But I do not see this circuit doing that.

Regards
Paul


On Sat, Aug 16, 2014 at 12:20 PM, Kenneth G. Gordon <
kgordon2006 at frontier.com> wrote:

> On 16 Aug 2014 at 11:33, Bob Camp wrote:
>
> > Hi
> >
> > I would be *very* surprised if the NAA antenna was 50% efficient
> (transmitter RF
> > to radiated power).....
>
> According to this:
>
> http://www.scribd.com/doc/145116437/THE-BIGGEST-LITTLE-ANTENNA-IN
> -THE-WORLD-US-Navy-s-VLF-antenna-at-Cutler-Maine
>
> The company which designed and built the dual trideco antenna system at
> Cutler had to guarantee >50% radiation efficiency, and they achieved an
> antenna radiation efficiency of 74.9% when using the 6 panel trideco.
>
> When I read this, I was truly amazed.
>
> Although, this site:
>
> http://www.navy-radio.com/commsta/cutler.htm
>
> does say that with 2 MW input, the ERP is 1 MW, which would indicate at
> least 50% radiation efficiency.
>
> I am still amazed.
>
> > Given that it´s already up and running with good signal levels, that´s
> not a big
> > deal.
>
> Very true indeed.
>
> Ken W7EKB
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