# Thread: People close to the towers

1. ## People close to the towers

I've discovered I am less than 1km from the new honey hills tower that is going up.

Shall I start the bets that I won't be able to connect to it? Is anyone else really close to a tower and can't connect to it?

For some strange reason, I think my modem will be "overwhelmed" by the strong signal (actual quote from helpdesk).

2. Well, there is suppose to be a tower coming up less than 700m away from me (the big proton building in constantia kloof)

.... but I don't really care anymore... I've applied online for Telkom to call me back re: ADSL, it's going to work out cheaper, plus I'll at least have reasonable speeds throughout my 3 gigs...

Hell, my gran on a scooter with a memory stick is faster than Sentech's MyWireless!

3. according to the free space path loss equation:

LdB = 20log(4*pi*d*c/f)

where c=speed of light (or radiated waves in this case) in m/s
d=distance from source in m
f=frequency in Hz
pi=3.1415926535

for 1km @ 2518000MHz

LdB_1km = 20log(4*3.14159265*1000*2518x10^6/3x10^8) = 100dB
LdB_3.5km = 111dB

(my figures are at 3.5km for my tower and about -90dBm signal)

conclusion, with -90dBm received and 111dBm lost, they are pumping out 21dBm (125mW) PER MODEM

the difference close to tower versus far away is only 10dBm which is a little more than the gain using a cantenna.

technical details aside, I dont think overwhelming is accurate. overshooting yes. the tower radiates with an aperture (or whatever you call it) size with a certain amount of degrees horizontal and also vertical per sector. thus at close proximity you may lose some signal yes.

ALSO
plug 500m into the equation =&gt; LdB = 94dB
and 100m =&gt; LdB = 80dB
and 10m =&gt; 60dB
and 1m =&gt; 40dB
and finally, 6.5km =&gt; 116.7dB

which means that most of the signal is lost right at (and around) the tower. you will get fried if you stand up against a sector panel.

1km away is the perfect distance. Im too lazy and busy to generate a graph but im sure 1km is close to ideal for 50% signal strength.

Donovan, nice but shame. can you imagine the testing issues that are gonna arise. ouch. and you will *never* see another tower. shame..

btw, dB is a signal power scale. if in doubt, www.just*****inggoogleit.com

4. It's more a case of the antena's output, generaly the signal envelope is somewhat toroidal (for tv and radio and what not) so very close to the tower there is infact 0 signal alot of the time.

- Colin Alston
colin@slipgate.za.net

"Getting traffic shaping right is easy and can be summed up in one word: Dont." -- George Barnett

5. 303m directly west from the tower, maybe 70-100m lower. In the study (wrong side of the house) with patch pointing southeast thru the sliding doors signal of 14-23, 19 ave with 12SNL. If I take a 8m stroll outside thru the sliding doors, patch antenna 'bout head height straight at the tower, signal of 39% (20SNL) easily obtainable. Haven't been bothered to try the roof. Wife's a bit *reluctant* to hand up *her* laptop LOL

128K|21%|13SNL|36 Menlopark 2530

6. Well, the building I expect them to use will be the Horizon Towers, that huge(ly out of place in the middle of a low density residential area) building is probably perfect for them to put the sectors on it.

I'd recon it's about 1km away from me line of sight, so according to the answers here I should get good signal. I only want a stronger signal because at the moment my level is &lt;5%, when the wind blows, it disconnects. I currently connect to 82Honeydew tower... why do I feel as if I am going to be using my cantenna to force it to connect to 82 when this new tower is enabled? For some reason I have a bad feeling that this is not going to work very well... in true sentech style.

The most secure computer is one that is not connected to the internet. That's why I recommend Sentech MyWireless.

7. <blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Donovan</i>
<br /> For some reason I have a bad feeling that this is not going to work very well...
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

same old sh*

remember that song. S.O.S - that did not stand for save our souls...

best get a parabolic dish/antenna type thing. cantenna wont withstand that signal. you pretty screwed actually, since the sentech signal reflects very nicely

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