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[Sheflug] Odd router frequencies
- To: sheflug@xxxxxxxxxxxxxx
- Subject: [Sheflug] Odd router frequencies
- From: John Southern <linuxtarragon@xxxxxxxxx>
- Date: Sun, 7 Apr 2024 10:17:16 +0100
- Delivery-date: Sun, 07 Apr 2024 10:18:01 +0100
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Yesterday at the ShefLUG meeting it was mentioned that a router supplied by
BT had a hidden frequency in the 3GHz range.
There is a 3.65GHz range (802.11y) but it is only licensed in the USA (the
range is under the old CB radio band). The USA designated this band for
licensed transmitting stations only as they have to avoid areas which have
satellite earth stations
The problem with detecting it is the antenna would need a completely
different length.
A 2.4GHz antenna would be approximately 61.44mm (or division of such as the
common 30.7mm) for the dipole which could also be used for the 5GHz range
(1/2, 1/4 wavelength etc). To get a 3.65GHz would need a unique antenna to
detect.
What am I missing and how would I know that the frequency was there? Would
I need to make an antenna 81.633mm (300/3.675Ghz = 81.633mm) or division of?
Regards
John
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