Tuesday, September 13, 2011

WiFi - Something new?

We are at Karpaz Gate Marina in Northern Cyprus.  

I had a problem with our main computer and its external USB WiFi adapter receiving the marina's WiFi signal.  I had no problem with my Apple iTouch receiving the signal.  I have been trying lots of things and finally opted to replace the WiFi adapter with a spare.  My old USB WiFi adapter was bought in the US 5 or 6 years ago and the spare bought in the US about 1-2 years ago.

Magically, the new USB WiFi adapter found the marina's access point.  I looked a little closer and determined that the marina's access point is using channel 13.  This is a new channel and generally not used in the US because of low power restrictions placed on the channel.  I assume my older WiFi adapter was not made to receive channel 13.

So, there you are more thing to think about.  It is beer-thirty here in Cyprus, so that is it for the day.



  1. 802.11 wifi is devided into 13 channels each 22 Mhz wide. They are spaced apart and most overlap. So you can be on channel 6 and pick up and communicate with a device on channel 7. Due to the wave size and the distribution there are 4 channels that do not overlap (1, 5, 9 and 13).

    I know many intel wifi devices for some reason have channel 13 disabled for some reason. The most logical reason is channel 13 is not permitted for use in the US.

    I do not know if there is a firmware or software setting to enable channel 13 on these intel devices or not.

    Lastly, Japan opted to add a 14th channel above the normal wifi space, so if you are ever in Japan, you might have to buy a japanese wifi adapter. The good new is, they work universally (at least for now).

  2. The new WiFi USB adapter that I bought about a year ago and had delivered to your house works fine. It "sees" ch 13. I had bought this new one because I figured that I needed to have a spare on board and because in some of the countries we have visited things like this are impossible or hard to find.

    The WiFi adapter that I bought 5 years ago is not made anymore and definitely does not see ch 13.

    I ran into a little different problem after I got the new one connected. Seems as though the marina WiFi system has some ports disabled. We use "Airmail" software to send and receive email while connected to the SSB radio. Airmail also has a Telnet feature that uses ports 8772, 50 and 50001 to connect when we have Internet. The marina WiFi system apparently has these ports disabled. Not a big deal at this point but it prevents me from downloading winlink and sailmail emails via Telnet with Airmail.

    Other than that, not much happening.


  3. It is beer-thirty here in Cyprus, so that is it for the day. Would that be 5:30 local time?

  4. beer thirty occurs at different times, in different places, and different circumstances...sometimes it is earlier than 1730.



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