[HamWAN PSDR] HamWAN over tideflats

[Benjamin Krueger]

It would also be interesting to see two of these test setups, some
reasonable distance apart, using one as the control and doing adjustments
on the other.

Tom, fwiw, I have all the same gear you do. We could set mine up for this
kind of thing.


On Tue, May 6, 2014 at 11:08 AM, Mike Culver <mculver at extencia.com> wrote:

> So signal strength is clearly correlated to the moon :)
> ________________________________________
> From: PSDR <psdr-bounces at hamwan.org> on behalf of Tom Hayward <
> esarfl at gmail.com>
> Sent: Tuesday, May 6, 2014 10:59 AM
> To: Puget Sound Data Ring
> Subject: Re: [HamWAN PSDR] HamWAN over tideflats
>
> On Tue, May 6, 2014 at 10:53 AM, Bart Kus <me at bartk.us> wrote:
> >
> > That's a cool observation.  I would caution against equating correlation
> with causation though.
>
> Agreed.
>
> > "The effect of tides on signal level" may indeed be an effect of
> temperature changes (ducting?) or something else.
>
> Temperature didn't change much all day.
>
> > If I recall correctly, you were seeing very large (10dB?) high frequency
> (1s period?) signal swings.
>
> Nope. I never saw more than 1 dB change during a 10 second period
> (never really watched it for longer periods than that). The signal
> very smoothly increased as the tide came in from the minimum to the
> maximum I shared earlier. As it rose, I never saw it dip again by more
> than 1 dB.
>
> > It'd be fun to understand that phenomenon as well as the slower one
> you're reporting here.  Perhaps you were just being slowly moved through an
> interference node with the water level, and an antenna mounted +/- 2ft from
> your antenna's elevation might have reported the opposite power behavior?
>  I also wonder if there is any polarization rotation happening here.
>
> Maybe I should try the same location with a MIMO modem.
>
> Tom KD7LXL
>
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-- 
Benjamin
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