shorthairedp
join:2005-11-21
united state | reply to ehenry
Re: Will this hurt my radio?
There was a post here once about imitating free space loss for testing by placing certain materials in front of the antennas, would that apply in a functional environment? |
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lutful
Premium
join:2005-06-16
Ottawa, ON
 ·TekSavvy Solutions..
| said by shorthairedp  :There was a post here once about imitating free space loss for testing by placing certain materials in front of the antennas, would that apply in a functional environment? RF absorbing foams are very expensive and you will need maybe 12 inches deep block for 20-30dB reduction at 5Ghz. It is easier to turn down the TX power or use cross-polarization.  |
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shorthairedp
join:2005-11-21
united state
| No, he was using common materials, but he had an equation for figuring the mass vs frequency to be equivalent to a certain distance, I thought it was in this forum, but i cant find it.
as far as the cross polarization, I imagine its negligible, but wont doing that increase the retransmission rate? |
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lutful
Premium
join:2005-06-16
Ottawa, ON | Dense HDPE plastics (the kind used in cutting boards) and plain old wood will cut down 5Ghz signal. I recall hearing it was like 3dB per inch of thickness but haven't done any tests. |
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RadioDoc
58ef2c0
Premium,ExMod 2000-03
join:2000-05-11 | Or you could do a professional job of it and use the correct attenuator.
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Toolmaster of La Grange. |
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shorthairedp
join:2005-11-21
united state | how would you attenuate an integrated radio? |
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RadioDoc
58ef2c0
Premium,ExMod 2000-03
join:2000-05-11
·AT&T Midwest
| said by shorthairedp :how would you attenuate an integrated radio? You can pretty much bet that if the received signal is that hot the transmitted signal is bombing into the AP at a high level too. Any standard attenuator which can also dissipate the required power will work both ways on the same antenna lead.
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Toolmaster of La Grange. |
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shorthairedp
join:2005-11-21
united state
1 edit | said by RadioDoc :said by shorthairedp :how would you attenuate an integrated radio? You can pretty much bet that if the received signal is that hot the transmitted signal is bombing into the AP at a high level too. Any standard attenuator which can also dissipate the required power will work both ways on the same antenna lead. So youre saying to crack the unit open and put this in? Any time a unit is cracked open and aftermarket parts are rigged in, I have a very hard time considering that "professional" |
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RadioDoc
58ef2c0
Premium,ExMod 2000-03
join:2000-05-11
·AT&T Midwest
1 edit | Yeah, I misread your post (having started this with wattmeters, etc. in another thread) and indeed an "integrated" radio won't be much use with an external attenuator. Probably would be a better idea to use the correct equipment in the first place instead of trying to hack something together like metal screens and foam. That would look really "professional" too, right?
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Toolmaster of La Grange. |
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