TiVo Forum Special Member
Registered: Nov 2002
Originally posted by sanderton
Ah, I hadn't thought of that.
I have got to say my knee-jerk response was that the 2.4 GHz band was allocated to things like Wi-Fi and Video Senders because the 'Cone of Silence' was not a significant issue.
I have been unable to track down high-grade tech-spec sheets that address the issue. However, I have come across a third hand report that reports what I think is a staggering low 50° degree vertical transmission pattern with an omni-directional antenna >
Now, it has to emphasized that the antenna being reported on was a high gain-antenna intended to extend the range of a router. However, the fact that it was omni-directional leads me to believe that even with a standard omni-directional antenna, you could have a blind spot if you locate a client directly below a repeater. You may be able to rely on radiation reflecting objects in the room to scatter the signal and establish a link, but this may considerably decrease the bit-rate achieved.
Interestingly, I now recall that when aligning my 2.4 GHz Video Sender antenna it was very permissive in the horizontal plane but required careful alignment in the vertical plane. However, as I only wanted a one to one link, I purchased a sender that had an antenna that looked as if it was directional rather than omni-directional.
If you have got a high pitched roof that is not thatched (fire risk), perhaps you could mount a single repeater high and centre, orientated horizontally.
Incidentally, I have discovered two other areas where 2.4 GHz is less than optimum:
1) At the frequency some cell-phones work, you can get reception in under-ground trains etc. if you string a "leaky antenna" the length of the tunnel. It would be nice if you could install a leaky antenna all round your house underneath the eaves, but unfortunately it will not work at 2.4 GHz.
2) Broadly speaking, 2.4 GHz boxes should be located close to the antenna - related to 1) above, loss of signal in 2.4 GHz cables is high.
A couple of interesting links >
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