Out of interest, do you have many other wireless networks nearby? 40MHz channels on 2.4GHz wireless really is a bad idea unless you're the only network that can be seen since there isn't sufficient channel space to accommodate them. All WiFi certified products must not select 40MHz channels by default on 2.4GHz networks for this reason (it's known as the good neighbour policy) - usually the default is auto in which case 40MHz is chosen if there's no interference otherwise it uses 20MHz channels. Likewise if it's set to 40MHz the policy states that it should scale back to 20MHz if interference is detected.
My testing of 40MHz channels in a crowded environment (25 or so other networks seen by InSSIDer) gave a much lower throughput than using a 20MHz channel, everything else being equal. This was purely because of the additional interference the wider channel encountered. I also noticed the scaling back to 20MHz channels after a period of running on fixed 40MHz (but this was on a different wireless access point, so it's not unique to the HH3).
Also, don't expect that you'll achieve throughput speeds anywhere near manufacturers quoted speeds (e.g. 300Mbps) as you won't. See my post here http://forum.kitz.co.uk/index.php?topic=13769.msg260900#msg260900 for a more detailed technical description of why.
That's interesting.
My TalkTalk HG533 seems to default to using two wireless channels, I just assumed that this would be normal behaviour.
The BT HH3A didn't, but I selected it, and for a while InSSIDer was showing it using two channels
Now I'm consistently getting only one channel, despite reboots of HH3 and PC, and Windows reports the connected speed as 65Mbs.
I now can't seem to get it to use 2 channels again, even though 40MHz is selected - maybe it is interference then?
Although I don't have a great many networks nearby, usually between 3 and 5 in number. (Often all heaped onto channel 1!)
I'll turn the wireless off on the TalkTalk Modem to free up some space and see what happens when I reboot the HH3 once more.
Ian
[edited to correct my mistake with router model]