I understand you are attempting to use the Intel® Dual Band Wireless-AC 7260 for a hosted network with channel bonding.
Checking the advanced settings for the adapter, the option "Ad hoc channel 802.11 b/g" will only allow selecting a single channel of the 2.4 GHz band, it does not have the option to select a second channel for hosted networks.
The "802.11n channel width (band 2.4)" value has the option to set 40 MHz, but this may not apply to hosted networks.
We will check further on this to confirm if it is possible to do channel bonding with hosted networks, or if in fact, a single channel (20 MHZ) is the only option. We will update the thread as soon as we have additional information.
We reviewed your inquiry, and would like to inform you that we cannot guarantee that the adapter will be able to do what you are trying to achieve.
- Current Intel wireless adapters like the Intel® Dual Band Wireless-AC 7260 are designed for PC environments. Intel does not provide drivers compatible with Windows Server* for the adapter.
- The adapter is designed for basic hosted network usage, WiFi direct connections, or to be used as a WiFi client. You may use 3rd party software to set it as an enterprise AP, however, the adapter may not be support all the features available for enterprise integrations.
- The adapter driver only supports the selection of a single 2.4 GHz channel for Ad Hoc Networks. Additional configuration to use as AP with Channel bonding would rely on 3rd party software, so you might want to contact the software provider for assistance on this matter as well.
The adapter is able to do channel bonding when operating in 802.11ac 5 GHz. However, Intel wireless adapters can't start hosted networks in 5 GHz due to regulatory compliance; as noted in question 5 of the Intel® Wi-Fi Products - Current Top 10 Frequently Asked Questions
Please keep in mind that using the adapter in 5GHz with infrastructure mode is not supported by Intel, furthermore, the adapter is not supported with Windows Server* versions.
We cannot confirm if it will do channel bonding under that configuration, or whether it will work or not.
For your reference I would like to provide you with a previous forum where the user was attempting a similar configuration: