Fhz (Channels) Information for NZ Motorsport

In the first instanceinstance, to clear up aan interchangeable term, channels and FhzFHz (frequency)

A FhzFHz is what the radio is tuned in to, a little like in the old daysdays, when we used to have an old old-style car radio we used toand tune up and down the dial to find a radio station. What we were doing iswas changing the receive fhz in order to find a station.

A channel is like the presets that you memorise when you findtune thein to a radio station. The channels allow you to easily come backreturn to the radio station at a latter date,later, so aeach channel contains a fhz.frequency. In realityreality, these terms are interchangeable and often mean the same thing.

What is  CTCSS or Tone?

Modern radios have the ability to notcannot only hear a transmission on a specific fhz,fhz but they also can apply a filter. This filter is doneimplemented by the way of sending a CTCSS tone. These tones are often referred to as sub-audioable as they are outside the range of what we can hear.

When set onto a receiver, it will only allow you to hear the audio onfrom the specific fhzFHZ set that contains the correct CTCSS tone. So what they do is act as a filter on the channel. While your radio may hear other transmissions or noise on the channel, if itthey doesdo not contain the correct tone, itthey will NOT be able to be heard by the user of the radio.

What are the Dangersdangers withof using CTCSS tones?

While they sound like the answer to a lot ofmany problems, they only work when transmitters are configured to send them. Our experience has seen that, while they are mandated, not all tracks have them set to be sent. If your receiver is configured only to hear only transmissions with a tone and the event organisers of the event hashave radios that are not set to send them, you will NOT hear their transmission.transmissions.

What happens if my Receiver does NOT have a CTCSS tone set?

Nothing, what this means is that you will hear all transmissions on the channel. It will not in any way affect your ability to hear race control. The downside of not having the tones configured is thatthat, because your radio will hear everything on the set channel, you canmay be susceptible to hearing noise or interference.

NZ Circuit Track and GT cars fhz: 455.16875 MHz
NZ Circuit CTCSS and GT cars Tone: 179.9 hzHz

NAZCAR Fhz: 455.00625 MHz

Speedway Track fhz: 455.0625 MhzMHz
Speedway CTCSS Tone: 123.0 hzHz