In the last post I mentioned repeaters as a way to get more range out of a handheld. That’s true — a repeater on a hilltop with a decent antenna can cover an entire city or region, turning your 5W handheld into something genuinely useful. But getting your radio programmed correctly to use one? That took me longer than I’d like to admit.

This post covers what I wish someone had told me before I spent an evening pressing buttons and hearing nothing back.

What a repeater actually does

A repeater is a transceiver — usually mounted somewhere high up — that receives on one frequency and simultaneously re-transmits on another. You transmit on the repeater’s input frequency. It re-transmits your signal on its output frequency. Everyone listening hears the output.

Because the repeater is typically on a hill, tower, or tall building with a proper antenna, it can relay your signal much further than you could reach on simplex.

Setting up the radio — the bit I battled with

I’ll be honest: getting my first repeater programmed into a cheap handheld was frustrating. The menus are cryptic, the terminology assumes you already know what you’re doing, and the manual is often a badly translated PDF. Here’s what you actually need to configure.

1. Find your local repeater

ukrepeater.net is the main source. Look up what’s near you and note down:

  • The output frequency (what you’ll listen on)
  • The input frequency (what you’ll transmit on)
  • The CTCSS tone (access tone)

2. Set the radio to narrow bandwidth

This is the one that caught me out first. VHF/UHF FM repeaters in the UK use 12.5 kHz channel spacing (narrow). Most cheap radios default to wide (25 kHz). If you’re on wide, your signal bleeds into adjacent channels and you’ll sound distorted to anyone listening.

Look for a setting called W/N, Wide/Narrow, or Bandwidth in your radio’s menu. Set it to Narrow. Do this before anything else — it’s easy to forget and wonder why your audio sounds terrible.

3. Work out the offset and direction

The offset is the difference between the repeater’s output frequency (what you listen on) and its input frequency (what you transmit on). On 2m in the UK, the standard offset is -600 kHz — meaning you transmit 600 kHz below the output frequency.

For example, if the repeater output is 145.7500 MHz, you transmit on 145.1500 MHz. That’s a negative offset of 600 kHz.

On 70cm, the standard offset is -1.6 MHz.

Most radios let you set this as a repeater shift — you enter the output frequency as your main frequency, then set the offset direction (minus or plus) and the offset amount. The radio calculates the transmit frequency for you.

If in doubt, check the repeater listing — it’ll tell you both frequencies explicitly. You can always just program the TX and RX frequencies separately if your radio supports that.

4. Set the CTCSS tone — on transmit only

Most UK repeaters require a CTCSS tone (Continuous Tone-Coded Squelch System) to activate. This is a sub-audible tone your radio sends alongside your voice when you transmit. The repeater won’t open unless it hears the correct tone.

The critical thing here: set the tone on transmit only, not on receive. Your radio’s menu will usually offer three options:

  • Off — no tone
  • Encode (or T) — tone on transmit only ✓
  • Encode + Decode (or T/R) — tone on both transmit and receive ✗

You want Encode / T. If you set it to encode and decode, your radio’s squelch won’t open for the repeater’s output (because the repeater isn’t sending a CTCSS tone back to you), and you’ll hear nothing — even though the repeater is working fine.

This one mistake probably accounts for half the “I can’t hear the repeater” posts online. Set tone to transmit only, and check the repeater listing for the correct frequency — it varies by repeater.

5. Allow transmit while receiving

Some radios have a setting that prevents you from transmitting while the channel is busy — so if the repeater is active (someone else talking, or the repeater tail is still up), your radio treats the channel as occupied and won’t let you key up.

Look for a setting called TXI (transmit inhibit), Busy Channel Lockout, or BCL in your radio’s menu and make sure it’s off. If it’s on, you’ll press the PTT and nothing will happen, which is baffling the first time it occurs.

You don’t call CQ on a repeater

This is an important difference from simplex. On a repeater, you don’t call CQ. The convention is to simply announce yourself and say you’re listening:

“MM7IUY listening through GB3AA.”

Or even simpler:

“MM7IUY, listening.”

That’s it. If someone’s monitoring the repeater, they’ll come back to you. If nobody replies, wait a few minutes and try again. Repeaters often have regulars who are listening but not actively calling — your announcement lets them know someone’s there.

What a repeater QSO sounds like

Here’s a realistic example of a short repeater conversation. No drama, no formality beyond the basics:

You: “MM7IUY listening through GB3AA.”

Them: “MM7IUY, this is GM0XYZ. Good evening, how are you?”

You: “GM0XYZ from MM7IUY, good evening. I’m well thanks — you’re coming in loud and clear through the repeater. I’m in [your area], running a handheld. How copy?”

Them: “Good copy. I’m in [their area], just got home from work. Are you newly licensed?”

You: “Yeah, passed the Foundation a few weeks ago. Still getting used to the radio — took me a while to get the repeater programmed in, if I’m honest.”

Them: “Haha, we’ve all been there. Well, welcome to the hobby. If you ever need a hand with anything give me a shout on here, I’m usually monitoring most evenings.”

You: “Appreciate that, thank you. I’ll let you go — 73, GM0XYZ, this is MM7IUY.”

Them: “73, MM7IUY. GM0XYZ clear.”

A few things to notice:

  • No CQ. Just an announcement.
  • Callsigns at the start and end, but you don’t need to hammer them every single over.
  • Leave a gap between overs. On a repeater, there’s usually a short pause after the repeater drops its carrier (you might hear a tail beep or a brief silence). Wait for that before transmitting — it confirms the repeater has finished re-transmitting the previous station and is ready for your signal.
  • Keep it natural. Repeater conversations are chatty. There’s no minimum or maximum length. Some are two overs, some are an hour.

A few more things worth knowing

Repeater timeout. Most repeaters have a transmission time limit (often 2–3 minutes). If you hold the PTT too long, the repeater will cut you off. Keep your overs reasonable and pause between them.

Linked repeaters. Some repeaters are linked to others via the internet (IRLP, EchoLink) or RF links. You might be talking to someone on a completely different repeater in another part of the country. The repeater listing will usually say if it’s linked.

Quiet repeaters aren’t broken. Just like simplex, repeater activity varies. Some have regular nets (scheduled group calls) at specific times — check local club websites for schedules. Even a quiet repeater is worth calling on, because you might be the person who starts the conversation.

Courtesy. If you hear a conversation already in progress, wait for a natural break and then announce your callsign. The other operators will usually invite you in. Don’t transmit over the top of an ongoing QSO.

The checklist

Before you key up on a repeater for the first time:

  1. Bandwidth set to narrow (12.5 kHz)
  2. Output frequency programmed as your main/receive frequency
  3. Offset set to the correct direction and amount — check the repeater listing
  4. CTCSS tone set to encode/transmit only, correct frequency from the repeater listing
  5. Busy channel lockout / TXI turned off so you can transmit while the repeater is active
  6. Don’t kerchunk — never key up to test the repeater without giving your callsign. If you want to check you’re getting in, key up and identify yourself
  7. Listen first — make sure the repeater is there (you might hear it drop its carrier or hear other stations)

If you’ve done all that and you can hear the repeater’s courtesy beep or other stations, you’re good to go. Key up, give your callsign, and see who’s about.

73 de MM7IUY