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Bandpass Filter Q & A

Question: Why do I need a Hyperlink Brand Ultra High Q band pass filter?

• To reduce interference thus improving radio reception.
• To increase performance of co-located equipment.

Question: What is interference and why do I want to eliminate it?

• Interference is caused by transmission sources near the channel you are transmitting on. It can be identified by signal strength and frequency.
• Unwanted transmissions, interference, may confuse your receiver or cover up the signal you are trying to receive.

Question: How do the Hyperlink Brand Ultra High Q band pass filters work?

• The filter will only pass the frequency, channel, you are transmitting or receiving and reduce the interference of signals outside your channel.
• The filter will NOT reduce interference on your channel caused by other signals or users on the same channel.

Question: What is meant by channel filtering?

• The passing of one channel while rejecting all other non-overlapping channels.
• The isolation of between channels when installing co-located equipment.
• The protection against signals outside your band such as cellular.

Question: What is the difference between the number of poles?

• Each pole represents a filtering circuit. The more poles, the more filtering strength.
• The 4-pole band pass filters are recommended to filter out weaker interference signals.
• The 8-pole band pass filters are recommended in high wifi zones or zones with strong RF signals.

2.4 GHz 802.11 Channel-to-Frequency Mappings

There are 14 total frequency sub-channels available for the wireless radios in the 2.4 GHz band, as listed in the chart below. Although there are several different frequency channel settings, there is a slight overlap between the channels. For example, there are three non-overlapping channels available in the FCC regulatory domain. When choosing frequency channels for wireless stations in the vicinity of each other, you should choose frequency channels that are several channels apart from each other (e.g. Channels 1, 6, and 11). Channels 12-14 are for use outside the US.

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