# V3 Firmware Analogue Channels Guide

We have seen some customers experiencing interference with the radios on the Analogue channels. We have made some changes to this framework to help address this problem.

[To see how to select these channels](https://books.speedtech.co.nz/books/dmr-dual-channel-radio/page/how-to-change-receive-channel)

[To set Squelch levels (can also help)](https://books.speedtech.co.nz/books/dmr-dual-channel-radio/page/setting-the-squelch-only-applies-to-analogue-channels)

If the channel name includes "-T", it means [tone or CTCSS filtering ](https://books.speedtech.co.nz/books/general-radio-information/page/what-is-a-ctcss-or-tone-filter)is enabled on this channel. If the name contains "-N", it has NO tone filtering.

By default, all tracks should use filtering, but if you go to a track or event and cannot hear anything, try switching to the "-N" channel. This indicates that the organiser's transmitter has not been set up correctly.

Analogue Channel Selection Information.

**Motorsport NZ Channels** MSNZ-T-L   
MSNZ-T-M  
MSNZ-T-H  
MSNZ-N

These channels are all the same channel, with different levels of interference filtering. It will depend on the kind of interference you are getting and what works best for you; it will take a little trial and error to get the right filtering.

**Nazcar Channel** NAZCAR-N

**Speedway Channel** SPWay-T  
SPWay-N