Baofeng UV-5R Repeater

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References

Beofeng UV-5R Instructions

How to change Transmit Power

  • The Baofeng UV-5R has both Low-Power and High-Power transmit mode.
  • For short range communication and testing it is better to set to Low-Power Mode.
  • Low-Power is 1 Watt and High-Power is 4 Watts
  • To alter power settings press Menu 2 and press Menu again to enter Edit Mode
  • Use the up and down arrow keys to toggle between Low-Power and High-Power mode.
  • Press Menu to commit changes.
  • Press Exit to exit the Menu.
  • When in Low-Power Mode a L character will appear in the main display.

Setting Squelch

  • A high Squelch setting only allows strong radio signals to be received by the radio.
  • A low Squelch allows strong and weak signals to be received.
  • The default Squelch setting on the Baofeng UV-5R is 3. This will allow most signals to be received.
  • To change the Squelsh setting press Menu 0. Press Manu again to enter Edit Mode.
  • Use the up and down arrow keys to change the Squelsh setting.
  • The Squelch setting range from 0 to 9.
  • Press Menu again to commit changes.

Locking the Keypad

  • Press and hold the Lock key at the bottom right of the keypad.
  • To unlock, press and hold the same key.
  • The Baofeng UV-5R will voice the current lock status.

How to Program frequency channels for the Beofeng UV-5R from keypad

References

Channel and Frequency Modes

  • Press the VFO/MR Button and select Frequency Mode

Selecting A or B Channel

  • The Baofeng UV-5D can listen to two radio channels simultaneously Channels A and B.
  • However when a signal comes in you can only listen to one of the channels.
  • If there are two incoming signals, channel A will have priority.
  • To change channels press the A/B button to toggle between the two.
  • Press the A/B button and choose the A side - only the A frequency displace is saved in memory.
  • A side must be used program channels in the radio. We'll get to this later.
  • The display settings for channels A and B can be changed in Menu 21 and Menu 22, respectively.

Set Band

  • Choose Band button to choose the correct frequency for radio.
  • We need to select the 144.00 - 148.00 band (2m band)

Disable TDR

  • Disable TDR by pressing Menu and the number 7 - (Menu 7).
  • TDR is used to monitor two frequencies (or channels) but only transmit on one of them.

Enter Receive Frequency - Downlink Freqency

  • Enter the frequency required for reception.
  • For example Kinglake Central, Australia - VK3RMN the Downlink Frequency is 146.850

Enter the Transmit Frequency - Uplink Frequency

  • Communication with the repeater uses two separate frequencies to minimise interference.
  • The Uplink frequency is slightly different from the Downlink Frequency.
  • This is called the Offset
  • For VKRRMN the Offset is -0.6 MHz
  • This means that the Transmit (Uplink) frequency is Lower than the Receive (Downlink) Frequency.
  • To set the Offset enter Menu 26. Press Menu again to enter Edit Mode.
  • Set the Frequency Offset using the keypad.
  • For example a 0.6 MHz offset would be entered as 000.600

Set the Offset Frequency Direction - SFT-D

  • The Offset Freqency direction can be Positive or Negative.
  • To set the direction enter Menu 25. Press Menu again to enter Edit Mode.
  • Use the up and down arrow keys to select from - minus, + positive or Off
  • For Repeater VK3RMN set direction to Negative
  • Press Menu to commit changes.

Transmit CTCS System Setting - Continuous Tone-Coded Squelch System

  • Enter Transmit CTCS code (T-CTCS) using Menu 13. Press Menu again to enter Edit Mode.
  • Press Menu and use the up and down arrow keys to select the correct tone frequency for the repeater.
  • In this case the Uplink Tone is 91.5 Hz. This tone is sub-audible. Humans can't hear this tone, but the repeater electronics can.

Disable T-DCS

  • For T-DCS press Menu 12. Press Menu again to enter Edit mode.
  • T-DCS is Digital Coded Squelsh. This feature will be left in the default OFF setting.

Save to Channel

  • Press Menu 27. Press Menu again to enter Edit Mode.
  • Enter the desired channel number. There are 128 channels available.
  • Press Menu to commit the change to memory.

Configuration settings required for an Amateur Radio Repeater

Here's how CTCSS tones are typically used with the information you provided:

  • Downlink Frequency (Repeater Output): The downlink frequency is the frequency on which the repeater transmits. In this case, it's 146.850 MHz. This is the frequency you would tune your receiver to in order to listen to the repeater's transmissions.
  • Uplink Frequency (Repeater Input): The uplink frequency is the frequency on which you need to transmit in order to access the repeater. In this case, it's 146.250 MHz. When you want to transmit through the repeater, you would set your radio to transmit on this frequency.
  • Offset: The offset specifies how the uplink frequency differs from the downlink frequency. In this case, it's a negative offset of -0.6 MHz. This means that when you transmit on 146.250 MHz (uplink), the repeater will retransmit your signal on 146.850 MHz (downlink), creating a duplex communication link.
  • Uplink Tone (CTCSS Tone): The uplink tone, specified as 91.5, is the CTCSS tone required to access the repeater. When you transmit on the uplink frequency (146.250 MHz), your radio will also transmit a sub-audible tone at 91.5 Hz. The repeater is configured to only respond to incoming signals on its input frequency (146.250 MHz) that have this specific tone. This helps prevent interference from radios not using the correct tone. CTCSS stands for Continuous Tone-Coded Squelch System, also known as PL (Private Line) tones or simply "tones" in the context of amateur radio. CTCSS is a method used to selectively open the squelch on a receiver by using a sub-audible tone. It's used to reduce interference and allow multiple users or repeaters on the same frequency to coexist without hearing each other's transmissions.


So, to use this repeater, you would:

  • To receive transmissions from the repeater, simply tune your receiver to the downlink frequency of 146.850 MHz. The repeater's output signal will be there, and it will not contain the CTCSS tone.
  • Enable the CTCSS tone of 91.5 Hz on your radio's transmitter.
  • When you transmit, your radio will transmit both your voice signal and the 91.5 Hz CTCSS tone.
  • The repeater will receive your signal on its input frequency (146.250 MHz). This is the Uplink Frequency and will be programmed in automatically.
  • The repeater will recognize the 91.5 Hz tone, and retransmit your signal on its output frequency (146.850 MHz). This is the Downlink Frequency.
  • This system allows for multiple users to share the same repeater frequency while minimizing interference from other users or unwanted signals.

Scanning Radio Frequencies

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