Good morning!!!!

[daugen]

looks like a traditional rain maker headed North, sucking water out of the Gulf and sending
it north on a 45 degree angle
or so it appears
rain coming in at noon
going to leave car outside since it's not going to freeze and I'll take
any free car washing I can get with all the salt dust everywhere.

I turned my outside hose back on two days ago and did a quick wash on the car.
Really wanted to get salt off as much as possible.
I did remember to turn the outside water off in the basement, and take the nozzle off.
wrecked a few forgetting to do that.
But that old fashioned Goodyear black rubber garden hose has now been half buried and left outside for five years, and
seems to be just fine. Good stuff. Maybe being sentimental because Goodyear Rubber used to have a plant here locally in Trenton NJ. So it's gone through at least a dozen freeze thaw cycles and still seems ok.
As the guy on the tool testing show says
that's impressive

I would have thought some high tech plastic hose would last longer, but usually their cheap fittings fail.

there is only one outside spigot on this cottage so I have to improvise by running a hose around to rear of house.
only thing good about one spigot is it's better than none.

 

[Thomas]

30F partly cloudy day mid 30's for high,ice snow mix arriving around 7pm weather station showing up 2" ending by daybreak tomorrow.

Pans for today...remove couple cement pads from walkway,first time ever ice push the pads up pads rock when step on bad tripping issue,not else plan might watch evening NFL playoff game.

Enjoy your day all.

 

[riptides]

50 outside right now, the high for the day. Raining, or drizzling, grey outside.

Debating on getting the wood stove fired back up. An indoor day for us today. Too bad the playoffs don't start early.

Hope all have a great day and .....be safe.

 

[WinterDeere]

I wonder how many feet of antenna you need for ultra low frequency
so you can talk to the submarines.
now if you could eavesdrop on the whales...

Half wavelength is ideal for a simple wire antenna, which way down at their 76 Hz data comm frequency, would be 1225 miles in air.

One cool thing about sea water is that, despite it being very lossy (semi-conductive), it also has a very high dielectric constant (i.e. optical index), which really shrinks wavelengths by a good amount. I think most sea water has a dielectric constant around εr = 70, and wavelength shrinks by sqr(εr), so that'd bring ideal antenna length down from 1225 miles to "just" 146 miles. Those guys tow some long antennae, but probably nowhere near that long, so obviously their simple wire antenna is never going to be "ideal" at 76 Hz.

There are antenna designs that can reach ideal match with much less length, but I imagine anything real complex would be difficult to deploy and retract underway, a simple wire seems preferable from the standpoint of just dangling it out there while cruising along. So I suspect they just deal with a shorter and very "non-ideal" antenna, by pushing way more power thru the transmitter than would normally be required with an ideal antenna.

It makes the transmitter design much more complicated and expensive, but the Navy has money. It also makes the transmitter and subsequent increased cooling requirements consume a lot more power, but they probably have cooling water and power to spare on today's nuclear sub's.

 

[daugen]

76hz in music is low bass
apples and oranges?

 

[WinterDeere]

76hz in music is low bass
apples and oranges?

Nope. Oranges and clementines. Basically the same idea, but in electric and magnetic field, rather than modulating air pressure via a speaker diaphragm.

In fact, the 76 Hz tone traveling thru your speaker wire from the amplifier to the speaker, is the same exact type of signal that's being pushed from a transmitter into an antenna. Ratio of voltage and current is a bit higher on antenna (higher impedance), and modulation of the signal is different (data versus musical attack/sustain/decay), but otherwise the same.