Baofeng DM-1801 and DR-1801: setting up a DMR radio from scratch

The Baofeng DM-1801 is one of the cheapest doorways into the world of DMR. For the price of an analog handheld you get a full-featured dual-time-slot radio on which you can learn everything: talkgroup contacts, zones, Color Code, private calls. There is exactly one downside — without a properly built codeplug it is nearly useless. This article will take you from unboxing and the cable all the way to your first PTT press on the air of your own network.

The DM-1801 and its twin the DR-1801 (the same unit with a different badge and sometimes a slightly different firmware revision) are essentially a rebadged Radioddity GD-77 / TYT MD-760. That kinship matters: it is precisely why the compatible chassis accepts the alternative OpenGD77 firmware, covered below.

What this radio is and who it's for

The DM-1801 is a handheld (HT) radio on UHF (400–470 MHz), with 1024 channels, two DMR time slots (Tier II) and analog FM. The display is color, small, and navigation is button-driven. Power is around 5 W. This is an entry-level unit, and you should treat it accordingly:

• Who it suits: a newcomer who wants to learn DMR in practice without spending money; a hotspot owner who needs to test their network; as a backup or "garage" radio.
• Who it doesn't suit: anyone who needs dual band (VHF+UHF), APRS, roaming between repeaters, or convenient keypad entry. For that, look at the AnyTone D878.
• The key thing: firmware here is half the job. The stock firmware works, but it is the reflash to OpenGD77 that unlocks the radio fully.

Cable and CPS: where setup begins

The radio can only be programmed from a computer. You will need:

• Programming software (CPS) — the proprietary Baofeng/Radioddity utility specifically for the DM-1801/GD-77. The CPS version must match the firmware version in the radio, otherwise the codeplug either won't write or will land corrupted. First read the firmware version in the radio's menu, then get the matching CPS.
• Cable — the bundled USB cable with the connector for this unit. Inside there is a chip (usually CH340/CP210x) that needs a driver in Windows. If the radio isn't detected, 90% of the time it's the driver or a "sleeping" USB port, not the cable.

First-run sequence: install the driver, connect the radio while it is powered off, turn it on, open CPS, and press Read. Save the "clean" codeplug you read out as a backup — you can always return to it. Only after that should you start editing.

Frequencies, Color Code and time slot: the foundation

Before you start drawing channels, settle on three parameters of your repeater or hotspot. Without them matching there will be no contact — the radio simply won't "open" the digital channel:

1. RX/TX frequencies. For a repeater this is the offset (for example, the radio's TX = the repeater's RX and vice versa). For a simplex hotspot RX and TX are equal — one frequency for receive and transmit.
2. Color Code (CC) — the digital analog of CTCSS, from 0 to 15. It must match the repeater/hotspot setting. More in the article on Color Code.
3. Time slot (TS1/TS2). On a repeater talkgroups are rigidly assigned to slots. On a simplex hotspot TS1 is almost always used (or "slot doesn't matter" — but get into the habit of setting it deliberately).

You take these three values from your network's settings. In DMRhub they are shown right in your account next to the hotspot parameters, so there's no need to copy them by hand from someone else's tables.

Building the codeplug: contacts, RX group, channels, zones

A codeplug in CPS is built from the bottom up, and the order of steps is critical — each subsequent object references the previous one.

1. Contacts (Digital Contacts / TG)

A contact in DMR is not a "person" but an address: a talkgroup number (Group Call) or a subscriber's DMR ID (Private Call). Create one contact per talkgroup you need: for example, your network's general-call TG, a local TG, a test echo. The type is Group Call. The name should be short and clear — it will show up on the screen.

2. RX Group List

This is the list of talkgroups the radio will "hear" on a channel in addition to its main TG. Without a well-thought-out list you will transmit into a group but not hear replies from neighboring ones. What to put in it and why is covered in the article on the RX Group List. At a minimum: put into the list the TGs whose activity you want to catch on this channel.

3. Channels

A channel ties everything together: mode (Digital), RX/TX frequencies, Color Code, time slot, the default contact (the TG that PTT goes to) and the RX Group List. Create a separate digital channel for each "TG + slot" combination. Don't try to hang ten groups on a single channel — in DMR one PTT press = one TG.

4. Zones

A zone is simply a folder of channels that the knob/buttons switch between. The DM-1801 has a tiny screen, so keep zones thematic: "Hotspot", "City repeater", "Analog". How to split channels into zones sensibly is in the article on zones in a codeplug. The general logic and a codeplug template are in the basic article on what a codeplug is.

Writing the codeplug to the radio

Once the codeplug is built: connect the radio and press Write in CPS. A few practical rules:

• Before writing, double-check the firmware and CPS versions once more — a mismatch here is the most common cause of an "hour-long brick".
• Don't unplug the cable or turn the radio off during the write.
• If the write was interrupted and the radio won't boot, it can almost always be fixed by re-writing the firmware/codeplug in service mode — don't panic yet.
• After writing, test it on the hotspot: switch to a digital channel, press PTT into the test TG, and check Last Heard in your network account to see whether your transmission shows up.

Alternative: the OpenGD77 firmware

The main upgrade for the DM-1801/DR-1801 is not a new codeplug but a firmware change. OpenGD77 is an open firmware for GD-77-compatible units that radically improves reception, adds conveniences (viewing all received TGs, a monitor mode, flexible settings) and removes some of the stock firmware's limitations. This is a big topic of its own — it is broken down step by step in the article OpenGD77 on Baofeng.

It's important to understand: after switching to OpenGD77 the radio has its own codeplug format and its own utility (OpenGD77 CPS). A stock codeplug won't load there — you'll have to build channels and zones from scratch, now in OpenGD77's logic. But the result is worth it: many DM-1801 owners keep the radio precisely for OpenGD77 and remember the stock firmware only as an entry point.

Common beginner mistakes

• The radio transmits but no one hears it. Most often it's the wrong Color Code or time slot, or transmitting into a TG that doesn't exist on this repeater/slot.
• You hear silence even though the network is active. An empty or incomplete RX Group List — the TG you need didn't make it into the receive list.
• "Someone else's" data on the air. The DMR ID is not set or is set incorrectly.
• The codeplug won't write. A mismatch between CPS and firmware versions.
• A mess on the screen. Too many channels in one zone on a tiny display — split them across zones.

A systematic breakdown of causes and diagnostics is in the article on common codeplug mistakes. Most DM-1801 problems are configuration errors, not hardware.

How to set up the radio for your own network and hotspot

For a private network like DMRhub the scenario is extremely simple:

1. In your account, take the parameters of your hotspot: frequency (simplex), Color Code, the recommended time slot, and the network's talkgroup numbers.
2. Create the TG contacts (the network's general call + the groups you need) and put them into the RX Group List.
3. Create digital channels "frequency + CC + slot + TG" and group them into a "Hotspot" zone.
4. Enter your own DMR ID and callsign.
5. Write it, and test via Last Heard.

Since in DMRhub voice passes through a server-side AMBE vocoder, and the RadioStar hotspot on a Raspberry Pi is provisioned automatically from the portal, all that's left on the radio side is a correct codeplug — the network handles the rest.

Conclusion

The Baofeng DM-1801 (and DR-1801) is an honest way to get into DMR for minimal money. The unit itself is modest, but with a well-built codeplug — frequencies, Color Code and time slot exactly for your network, thoughtful contacts, RX group, channels and zones — it works perfectly on the air. Once you've mastered the stock setup, you'll almost certainly want to move to OpenGD77 — and this is that rare case where a cheap radio noticeably "grows up" from a firmware change. Start small: one hotspot, one test TG, one Last Heard check — and from there it all takes care of itself.