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deadmanish
Member
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# Posted: 29 Oct 2014 14:00
Reply
Is one coating of paint enough of yshield paint to block out AM and FM signals?
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deadmanish
Member
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# Posted: 30 Oct 2014 23:52
Reply
anyone?
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Henrik
Admin
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# Posted: 31 Oct 2014 13:41
Reply
Hi deadmanish,
According to the YShield paint data (see their website) the shielding seems to be rather uniform over the frequency range of 30MHz to 18GHz.
I'm assuming that with "FM" and "AM" you mean signals in the AM & FM radio bands? The paint will block the FM radio band which is usually around 80-100 MHz. Contact YShield for info on shielding performance of kHz frequencies (AM radio band).
One layer of YShield has an attenuation of 37 dB (99.980 %) and two layers give a little bit more 44 dB (99.996 %). What I usually do is I measure before screening, then paint one layer, let it dry properly (all water needs to evaporate) and then I measure the attenuation. If a strong source of radiation is close to a painted wall then I give it an extra layer.
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ericgeneric
Member
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# Posted: 31 Oct 2014 17:33
Reply
Yes, always let each coat of paint dry thoroughly.
EG.
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deadmanish
Member
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# Posted: 1 Nov 2014 21:12
Reply
does the paint have to be grounded to use?
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deadmanish
Member
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# Posted: 1 Nov 2014 21:13
Reply
does the paint have to be grounded in order to use?
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deadmanish
Member
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# Posted: 1 Nov 2014 21:14
Reply
dHi deadmanish,
According to the YShield paint data (see their website) the shielding seems to be rather uniform over the frequency range of 30MHz to 18GHz.
I'm assuming that with "FM" and "AM" you mean signals in the AM & FM radio bands? The paint will block the FM radio band which is usually around 80-100 MHz. Contact YShield for info on shielding performance of kHz frequencies (AM radio band).
One layer of YShield has an attenuation of 37 dB (99.980 %) and two layers give a little bit more 44 dB (99.996 %). What I usually do is I measure before screening, then paint one layer, let it dry properly (all water needs to evaporate) and then I measure the attenuation. If a strong source of radiation is close to a painted wall then I give it an extra layer. does the paint have to be grounded to be able to use?
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agnes
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# Posted: 2 Nov 2014 03:05
Reply
deadmanish No it does Not Have[u][/u] to but it makes it more active. If you live in the UK you can earth it with a redundant electrical wall plug,earth only Or elsewhere if you have a 3 pin plug Ground floor,easier,earth it to outside with by connecting to a rod stuck deep in to the soil outside Best regards Agnes P.S.we..can tell you how
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Henrik
Admin
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# Posted: 2 Nov 2014 14:00
Reply
deadmanish,
Earthing of YShield is not required to block radiofrequency signals (FM at least). The grounding prevents ELF (power-frequency) fields, coming from internal wiring, from coupling to the paint and propagating. Remember to leave a border without paint of 3-5 cm around wall sockets and switches.
I always ground YShield painted walls just to be sure.
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deadmanish
Member
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# Posted: 2 Nov 2014 15:26
Reply
Henrik,
Even if you do not ground will the paint still block emf?
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Henrik
Admin
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# Posted: 2 Nov 2014 16:34
Reply
deadmanish,
Yshield paint without grounding will still block radiofrequency fields. Once the paint is completely dry and all the water is evaporated, it is shielding. I always, however, ground the paint, due to the reasons mentioned in my previous post.
If you are in doubt, please contact YShield ( info {-at-} yshield.com )
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deadmanish
Member
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# Posted: 17 Nov 2014 23:13
Reply
Yshield paint without grounding will still block radiofrequency fields. Once the paint is completely dry and all the water is evaporated, it is shielding.I always, however, ground the paint, due to the reasons mentioned in my previous post.If you are in doubt, please contact YShield ( info {-at-} yshield.com )
how much protection will the paint provide without being grounded and also what is the difference between the hsf54 and hsf57 paint?
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Henrik
Admin
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# Posted: 17 Nov 2014 23:54
Reply
deadmanish,
Contact YShield: info {-at-} yshield.com and ask them.
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sevenx
Member
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# Posted: 18 Nov 2014 13:34
Reply
Henrik, Why do ypu recommend to leave a border without paint of 3-5 cm around wall sockets ? On YShield site i didn;t see this recommandation?
Thanks
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