Setting the CTCSS and CDS on the Ailunce HD1

What is the CTCSS and DCS?

Setting the CTCSS and CDS on the Ailunce HD1 is very easy.

Ailunce HD1 has an Analog mode and Digital mode radio. Also, it can be programmed by its keypad. So it is very easy to set the CTCSS and DCS.

First, we will talk about what is CTCSS and DCS, then tell you how to set them on Ailunce HD1. There are two ways to set these codes on Ailunce HD1. On software and by its keypad.

What are the CTCSS and DCS? In telecommunications, CTCSS and DCS are systems used to reduce the annoyance of listening to other users on a shared two-way radio communications channel.

What’s the CTCSS?

CTCSS is a Continuous Tone Coded Squelch System. It does this by adding a low-frequency audio tone to the voice. Where more than one group of users is on the same radio frequency, CTCSS circuitry mutes those users who are using a different CTCSS tone or no CTCSS. In other words, as long as the transmission has a different CTCSS or no CTCSS, then your radio will not pass any audio to the speaker.walkie talkies CTCSS codes

What’s the DCS?

CTCSS is an analog system. A later Digital-Coded Squelch (DCS) system was developed by Motorola under the trademarked name Digital Private Line (DPL). General Electric responded with the same system under the name of Digital Channel Guard (DCG). The generic name is CDCSS (Continuous Digital-Coded Squelch System). CTCSS and CDS are also referred to by other names, including CDCSS, PL, and DPL, but the official terms are CTCSS and DCS. They both have the same function and work in similar ways.two-way radios DCS codes

When do you need to set the CTCSS/DCS?

CTCSS and CDS are sometimes incorrectly referred to as a sub-channel because no additional channels are created. All users with different CTCSS or DCS tones on the same channel are still transmitting on the identical radio frequency, and their transmissions interfere with each other, however the interference is masked under most (but not all) conditions. The CTCSS feature also does not offer any security. CTCSS and DCS don’t stop anyone from listening to you, they just stop you from hearing other people. If someone has a radio with no CTCSS and DCS on, they will be able to hear everyone on the channel, including people using CTCSS and DCS.

In normal conditions, we want to hear more voices from others, so we don’t need to set the receive CTCSS or DCS. But when the repeater has a request, for example, the repeater has received CTCSS or DCS, we need to set a transmit CTCSS or DCS on the radio. Remember that CTCSS and DCS don’t stop anyone from listening to you, they just stop you from hearing other people. So when you find that your radio LED indicates there’s a signal, but you can’t hear a voice, please check the receive CTCSS and DCS first.

How to set the CTCSS and CDS, Most analog radios have two methods. We can set it on the programming software or set it via the radio keypad directly. It mainly depends on whether the radio supports adjusting it via the radio keypad.

Let’s take HD1 for example.


From the picture, you will find it shows no code. No code means you haven’t set the CTCSS/DCS codes. Here I will tell you how to set CTCSS and CDS on the Ailunce HD1.

Set the CTCSS and CDS on the Ailunce HD1 software.

Ailunce HD1 channel information

Open the software, Click the channel, and enter the channel setting. We can see the Dec QT/DQT and Enc QT/DQT. Dec QT/DQT means receive CTCSS/DCS, only when you don’t want to receive non-CTCSS/DCS or different CTCSS/DCS signals, you can set it. Dec QT/DQT will help you filter some signals. If you want to listen to more voices, You don’t need to set it, just keep it as none. Enc QT/DQT means transmit CTCSS/DCS.

When we checked the repeater information, we found that some repeaters had received CTCSS/DCS requests. So when we set the radio information, we need to set the corresponding transmit CTCSS/CDS. Only when we set the transmit CTCSS/DCS, the repeater can receive our signals. The received CTCSS/DCS is not needed.

Setting the CTCSS and CDS on the Ailunce HD1 Radio Keypad.

After knowing how to set CTCSS/DCS on software, we can see how to set it on the radio now. Ailunce HD1 is a true VFO radio and supports Front Panel Programming.

Turn on the radio. The band is in FM(analog) mode, we can enter into Band A/B Set. There are three options. C-CDC, R-CDC, T-CDC. C-CDC means Transmit CTCSS/DCS and Receive CTCSS/DCS are the same. you can one key to set them. Note, when you set C-CDC, it means, you have set both Transmit and Receive CTCSS/DCS at the same time. R-CDC means receive CTCSS/DCS. T-CDC means transmit CTCSS/DCS. The most common option we use is T-CDC. When we select the T-CDC, we can switch CTCSS, DCS, and OFF by pressing the star key. and then by pressing the up and down key or channel knob to switch CTCSS/DCS value.

CTCSS and DCS codes

I hope this blog can help you know more about the CTCSS and DCS, If you looking for the best ham radio,  you may consider Ailunce HD1.

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