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Post subject: Re: Are modern American Strats shielded under the paint?
Posted: Fri Feb 17, 2017 4:19 am
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My 16' American Special has shielding paint in the whole pickup and control cavity , But not the back tremolo cavity or the input jack cavity.. FWIW..


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Post subject: Re: Are modern American Strats shielded under the paint?
Posted: Sat Feb 18, 2017 7:14 am
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arth1 wrote:
Anyhow, the shielding is often a bit of placebo. Unless it is a complete Faraday cage that extends all around the electronics with all gaps small enough to not let the radio waves bandwidths through, it won't do as much as many might think.
You get cell phone reception on a phone with a metal shield on the back, sitting in a metal car. Heck, even on a plane. As long as there are gaps big enough, the waves will get in and bounce until they hit what works as an antenna. 80% shielding is almost as good as none.


I think the goal of shielding is to block 60 cycle hum. 60 cycle AC power has a very long wave length, very small holes will still block the hum.

Cell phones use a very high frequency which has a very short wave length, that's why you still get reception in a car or plane.

This is also why when you drive under a bridge it blocks out the AM radio, but not FM radio. AM has a long wave length and is easier to block.

8)

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Post subject: Re: Are modern American Strats shielded under the paint?
Posted: Sat Feb 18, 2017 10:19 am
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Well the wavelength of 60/50 hertz is long but that component is the heard part of the interference. Generally it rides the wave of a much higher frequency or rf waveform.
Interference takes many forms and can be via the mains or via the ether.
Shielding is there mainly to reduce interference of the second.
I think unless you somehow shield the pickup covers on std single coils it is always going to be an issue. :D


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Post subject: Re: Are modern American Strats shielded under the paint?
Posted: Sat Feb 18, 2017 11:02 am
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omar59 wrote:
This is also why when you drive under a bridge it blocks out the AM radio, but not FM radio. AM has a long wave length and is easier to block.


Gotta call "BS" on this one, Omar.

Modulation type has nothing to do with the carrier frequency. And long waves are not easier to block. Ever hear of the US Navy's ELF system? That's the method with which National Command Authority maintains communications with the fleet of submerged ballistic-missile submarines on patrol at sea. If long waves were easier to block, the depth of the sea water would squelch any chance for those subs to receive their launch orders in the event of war.

Arjay

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Post subject: Re: Are modern American Strats shielded under the paint?
Posted: Sat Feb 18, 2017 8:49 pm
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Retroverbial wrote:
omar59 wrote:
This is also why when you drive under a bridge it blocks out the AM radio, but not FM radio. AM has a long wave length and is easier to block.


Gotta call "BS" on this one, Omar.

Modulation type has nothing to do with the carrier frequency. And long waves are not easier to block. Ever hear of the US Navy's ELF system? That's the method with which National Command Authority maintains communications with the fleet of submerged ballistic-missile submarines on patrol at sea. If long waves were easier to block, the depth of the sea water would squelch any chance for those subs to receive their launch orders in the event of war.

+1

The reason why FM works better than SW and MW most places is because the signal has a constant amplitude, allowing filtering out competing signals and noise which won't have the correct amplitude. And FM is dead easy to install broadcast antennas for in tunnels, as you don't interfere with the original signal; the receiver will just lock on to the strongest signal.

Long waves are the least stoppable - they curve around mountains and the curvature of the earth, as long as the transmitting station is powerful enough. And you don't need a straight antenna - a coil of proper length will do just fine, because the wave can follow any shape. I remember sitting in my basement listening to Radio Lux; FM and MW reception was out of the question, but LW made it just fine.
And that's precisely why there are so few LW stations left - they don't play nice with other LW stations even far away, and you end up with a transmission power war in the megawatt range. If you think your Deluxe Reverb has powerful vacuum tubes, think again - here's one at Droitwich for Radio 4:

Image

Even though most transmitters are gone now, on the East Coast of the US, you can still pick up BBC4 or Morocco, if you have a long wave capable radio.


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