which is better bandwidth 20mhz or 40mhz

A The 40mhz band is to increase the data throughput rate that the router runs. This is used in conjunction with the 802.11N band. Unless you also have a N-type card on your desktop/laptop then it is pretty much useless. When running B/G devices I would stay with 20Mhz. Hope this helps, if any other questions please let me know. Bandwidthis an indication of the "size" of an analog signal that an oscilloscope can accurately read. If you're reading the output of a serial transmission circuit operating at 20Mhz, you'll want an oscilloscope capable of at least 100Mhz to accurately read this waveform and record it. TheIEEE 802.11n standard allows wireless devices to operate on 40MHz-width channels by doubling their channel width fromstandard 20MHz channels, a concept called channel bonding. Increasing transmissionover 20MHz and 40MHz bandwidth. For legacy compatibility, Direct Sequence Spread Spectrum (DSSS), Complementary Code Keying (CCK) and OFDM baseband processing are included to support all IEEE 802.11b and 802.11g data rates. Differential phase shift keying modulation schemes, DBPSK and DQPSK with data scrambling capability, 20MHz; Ad-hoc channel 802.11 b/g. Ad-hoc channel 802.11 b/g is the band and channel selection for device to device (ad-hoc) networks. You don't need to change the channel unless the other computers in the ad-hoc network are not using the default channel. If you must change the channel, select the allowed operating channel: Vay 5s Online.

which is better bandwidth 20mhz or 40mhz