Q: Poor wifi reception on new iPad

I don't think so.

De facto standard is that 8 bits = 1 byte, thus 8 bps = 1 Bps (or bps is 8x the Bps value), which can signify both data transfer rate and bandwidth. The Hz signifies frequency.

802.11b has maximum theoretical limit of 11 Mbps vs 802.11n which has 150 Mbps (some implementations can exceed this, but then again they're all theoretical limit).

Unlikely. Inteference is more likely caused by devices that can generate interference near the channel that you're using in either the 2.4 Ghz or 5 GHz band, say a cordless phone. Also depends on the number of factors, like how strong the interfering signal is, and how far it is from either your device or your wireless router.

From what I've been reading, it's likely software-related.

b0nz0 wrote:

 

De facto standard is that 8 bits = 1 byte, thus 8 bps = 1 Bps (or bps is 8x the Bps value), which can signify both data transfer rate and bandwidth. The Hz signifies frequency.

 

802.11b has maximum theoretical limit of 11 Mbps vs 802.11n which has 150 Mbps (some implementations can exceed this, but then again they're all theoretical limit).

You forgot the start and stop bits.  Eight plus two equals ten.

Hz can indicate frequency but, in this usage, it indicate bandwidth.

It_caveman wrote:

 

The frequencys are what the bands (A,B,G,N) are capable of running on. "A" could run on 2.4 ghz but is seldom seen except at 5ghz if at all these days.

Those figures are not frequencies.  They are bandwidths.

It_caveman wrote:

 

The frequencys are what the bands (A,B,G,N) are capable of running on. "A" could run on 2.4 ghz but is seldom seen except at 5ghz if at all these days.The rates are just what they are. Mega Bits per Second.

Those numbers are not Mbps values.

It_caveman wrote:

 

You want real detail the look in wiki for it.

No.

Have it your wat, even if it's wrong. You can post no all you want to, must have something to do with published facts. Have a good one , if you can, considering your attitude.

One for to think on, what frequencies to the transceivers use to broadcast on ( they are radios after all) if not 2.4ghz and 5 ghz respectively?

5ghz does have a wider band width than 2.4ghz as it allows for more channels but regardless it's still the frequencies the transceivers use to sent and receive data. Unless you know a secret way the devices talk to each other that none of the rest of do.

Thanks, I pleased to know some know the difference.

You forgot the start and stop bits.  Eight plus two equals ten.

I stand corrected, not really familiar with physical layers/asynchronous serial communication in depth.

Hz can indicate frequency but, in this usage, it indicate bandwidth.

Depending on the consumer-class router (+ firmware) that one has and country, the bandwidth (or channel width) can either be 20 MHz or 40 MHz. The 2.4 GHz & 5 GHz mentioned earlier refer to the frequencies used.

Deleted.

Wrong, again. b0nz0 is correct about band width. You are current as it is known in electrical as well as electronic and network engineering.

Shows it all in the wiki tables as well.

I'm much better off for it. Thanks.

b0nz0 wrote:

 

You forgot the start and stop bits.  Eight plus two equals ten.

I stand corrected, not really familiar with physical layers/asynchronous serial communication in depth.

There is some question as to whether or not the start/stop bits are stripped off prior to transmission and re-inserted at the other end.  I know that it CAN be done but I do not know if it IS done.

b0nz0 wrote:

 

 

Depending on the consumer-class router (+ firmware) that one has and country, the bandwidth (or channel width) can either be 20 MHz or 40 MHz. The 2.4 GHz & 5 GHz mentioned earlier refer to the frequencies used.

Now, I'm the one that stands corrected.  2.4GHz is a carrier frequency but it's not exactly 2.4.  For example, Channel 1 is 2.412 and Channel 6 is 2.437.  The constant reference to "2.4" as a single fixed value is what caused me to conclude that it is not the carrier.

This gets more confusing.  As I have just learned, the 2.4GHz carrier frequencies can have either a 20MHz BW or a 40MHz BW.  Obviously, if the 40MHz BW is chosen, not all of the channels will be available.  This is unrelated to the 2.4MHz/5MHz decision.

Not all WiFi hardware can support all of these capabilities.  For example, the Airport Express can not support either the 40MHz BW or the 5GHz carrier.  The Airport Express can support the 5GHz carrier.  I don't know if it can support 40MHz BW.

Here is a bit more on band width, thought some of the readers might like it:

20MHz vs 40MHz

The N spec is able to use 40MHz of bandwidth for increased data rates, but to maintain compatibility with legacy systems, it requires one main 20MHz channel plus a free adjacent channel at ±20MHz. The main channel is used for legacy (a/b/g) or other clients that aren't able to transmit at 40MHz. The spec also requires the whole WLAN to only use the main 20MHz channel if it detects anything using the additional 20MHz channel.

In 5GHz band, it shouldn't be that difficult to find two free channels, so go ahead and turn 40MHz on.

However, when using 2.4GHz, using 40MHz isn't nearly as easy since the channels were already overlapped in 11b and 11g mode.

Effectively to use this feature, you will block 7–9 of the 13 channels and, of course, ch12 and ch13 aren't available in North America. So yes, it's possible that your neighbors will hate you if you turn this option on. This is why there was a lot of pushback at the end of the final IEEE 802.11n ratification to entirely ban 40Mhz in 2.4GHz. That didn't happen as 40MHz is still appropriate for some situations (ie: a warehouse) but the bottom line remains, enabling 40MHz in the 2.4GHz band isn't a good idea for dense residential areas.

Though the end result is the same, different manufacturers are using different methods to have the user pick their 20/40 channels.

Recent builds of DD-WRT have you choose the 20MHz Control channel and by specifying whether the Control channel is the "upper" or "lower" portion of the 40MHz block. You may need to toggle between upper/lower to unlock the channel you wish to use.

Some stock firmwares have you choose a Main and Aux.

It wouldn't surprise me if some had you also choose a main and then the center frequency of the 40Mhz channel.

Channels are specified by their center frequency but instead of displaying (center of main 20 MHz + center of additional 20MHz) the devs opted to display it as (center of main 20MHz + center of 40MHz).

Forgot the link to the compltete write up so here it is:

http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration