# RTC – MOD-02 – Pt.08 – Transmitting Techniques Frequencies

Within radio, there are a lot of bands and techniques but there are mainly 3 bands used in DCS:

- FM (30 MHz to 76 MHz)
- VHF (118 to 137 MHz)
- UHF (225 MHz to 400 MHz)

## The rules

So here are the 3 rules when it comes to saying frequencies on the radio:

- If it is FM/VHF, all digits and the decimal are spoken (3 digits, decimal, 3 digits)
- If the FM/VHF has .*00 behind the decimal i.e. 124.100, it will be abbreviated to 124.1 (3 digits, decimal, 1 digit)
- If it is UHF, the last digit is never spoken. (3 digits, decimal, 2 digits)

*examples*

**VHF **Fq 134.120 – *“Frequency one three four decimal one two zero”*

**VHF **Fq 120.025 – *“Frequency one two zero decimal zero two five”*

**VHF **Fq 118.100 – *“Frequency one one eight decimal one” (118.1)*

**VHF **Fq 122.000 – *“Frequency one two two decimal zero” (122.0)*

**UHF **Fq 255.400 – *“Frequency two five five decimal four zero” (255.40)*

**UHF** Fq 236.525 – *“Frequency two three six decimal five two” (236.52)*

## The explanation

Within the FM and VHF ranges, the steps between frequencies can be as little as 0.00833 MHz. This means that the last digit of a VHF frequency is significant. When it comes to UHF, the steps between frequencies are 0.025 MHz. Because of this, the last digit becomes standard. The frequency is always on either .*00 .*25 .*50 or .*75. This is why the last 0 or 5 is implied. So respectively, these numbers become .*0 .*2 .*5 .*7. It is expected that pilots know this when entering the number into their radio, that someone says 236.52 means 236.52**5** needs to be entered into the radio.

## What is expected

In 11TSG we expect the pilots to be able to apply the 3 rules in the beginning of this chapter. This means being able to identify a FM, VHF or UHF band spectrum based on the frequency, and to know then how to transmit it over the radio.