WiFi

[Guest guest]

guys,

I am thinking about moving into an apartment temporarily while we look

for a house. there is WiFi in the pool house which is about 50-75 feet

away. they said the WiFi will cover 300 feet. I can feel it in the

apartment though it is not as bad as what I have now and other

apartments.

Is WiFi easily shielded with Copper Paint? I am thinking of painting

that wall if it blocks that wavelength.

On Sep 28, 2005, at 5:18 PM, Joris Everaert wrote:

>

> Hello,

>

> Today I went to the National Spectrum Control Service (NCS) of the

> Belgian Institute for Postal services and Telecommunications (BIPT)

> in Brussels (the official service who performs the control measures

> from GSM and UMTS base stations in Belgium), to do some first

> comparative tests with my new Spectran HF-6080 Spectrum analyser and

> HL-6080 log-per antenna. The language from the people there is

> French, and my French is not that good ... but I managed to

> understand some results.

> I couldn't take notes at the moment itself (right after), the people

> there were busy, we only performed some quick tests, so the tests

> were not super accurate. Next time we might go in the field if there

> is time, the people there had no problem with that if it is after

> next month.

>

> The first technical test problem: they didn't have a portable

> Spectrum Analyser with log-per directional antenna or omni-isotropic

> probe in the building at the moment (I expect, all in the field),

> but they settled their big expensive Rohde & Schwarz FSH Spectrum

> analyser on the table before a window.

>

> Test 1.

> We first tested the real GSM 900 and 1800 bands of antennas nearby

> the building (measured from inside & couldn't see the GSM antennas

> from there), in dBuV, with RBW and VBW at 100 kHz and sweeptime

> 10 ms.

> First with my Spectran and HL-6080 antenna, and immediately after

> this we switched the cable with the HL-6080 antenna to the R & S

> analyser.

> The difference between the analysers ranged from 2 to about 6 dBuV.

> So we were quite happy with these results.

> Additional note: after the test, I saw that I forget to settle

> the " antenna type " in the menu of my Spectran. This was switched

> back at " none " , instead of " HL 6080 " antenna, because of the

> software update (beta 33)

> that I performed last weekend. So I expect the results could have

> been even better with that.

> Of course, one needs to take into account the problem of measuring

> from inside and reflections from buildings, and the important fact

> that the measurement was not at the " same " time (but close) because

> we had to switch the cable.

>

> We also tried to switch a normal antenna (not omni-isotropic, not

> directional) to the R & S, in comparison with Spectran and his HL

> antenna. The difference was quite the same for that also.

>

> Test 2.

> To test the Spectran with a known frequency and radiation, they

> switched the Spectran with the cable also to a generator. With the

> generator, we made some radiation at certain vast frequencies (100

> to 1800, 2000 MHz and a little above).

> The difference of radiations from 36 dBuV (approx. 0,002 V/m) to

> about 70 dBuV (approx. 0,3 V/m) was about 5-6 dBuV ( " always " 5-6

> higher on the Spectran), so a little bit more than expected but not

> very bad.

> Maybe there is an explanation for this, I don't know. I hope the

> menu settings on the Spectran were good, as I don't have the

> Spectran for a long time.

> The difference in the higher radiation levels from around 70 dBuV

> (approx. 0,3 V/m) to 100 dBuV (approx. 12 V/m)) was better (lower),

> about 2-3 dBuV.

> We had to perform these test quite fast, but the allround

> impressions from the technicians there were not bad.

>

> Note: When we closed the cable (50 Ohm), as expected, the Spectran

> didn't detect signals in the normal GSM range (I forget to change

> the span to complete for that).

>

> So these are the first impressions.

> In the near future, I will try to make some tests with other

> portable analysers in the field, ans also for DECT if I can find

> someone with a DECT telephone.

>

> Best regards,

>

> Joris Everaert

> Biologist

> Belgium

>

>

>

>

>

>

>

>

>