How to Setup Radiomaster Pocket Radio | Upgrades, Tips and Tricks

by Oscar
Radiomaster Pocket Radio Transmitter Thumb Hold Fingers Ergonomics

So, you’ve got yourself a Radiomaster Pocket? Great choice! Now, let’s ensure you get the most out of it. I’ll guide you step-by-step through the setup process for the EdgeTX-equipped Radiomaster Pocket radio, sprinkling in some handy tips and tricks along the way.

Some of the links on this page are affiliate links. I receive a commission (at no extra cost to you) if you make a purchase after clicking on one of these affiliate links. This helps support the free content for the community on this website. Please read our Affiliate Link Policy for more information.

Still wondering if the Pocket is suitable for you? Check out my in-depth review of the Radiomaster Pocket here: https://oscarliang.com/radiomaster-pocket/

Understanding the Controls and Switches

Here’s a diagram of all the available controls, buttons and switches on the Radiomaster Pocket. Familiarise yourself with it so you don’t get lost :)

Radiomaster Pocket Radio Transmitter Switches Buttons Controls Explain Manual Instruction Diagram

Battery Installation

To power up your Radiomaster Pocket, you’ll need two 18650 Li-ion cells. Simply remove the back rubber handles, and pop them into the battery slots. Both flat top and button top types fit well inside the Pocket.

Radiomaster Pocket Radio Transmitter Battery 18650 Li Ion

Unfortunately, the batteries are not included, but you can get them here. Higher capacity cells will give you longer flight time, but they might cost more. Here are my battery recommendations:

Radiomaster Li-ion 18650 2500mah:

Panasonic NCR18650B 3400mAh:

Molicel P26A/P28A 18650:

Sony VTC6 18650:

Potential Start-up Warnings

To power on, press and hold the radio’s power button for a couple of seconds.

Ideally, a brand new radio should fire up without any fuss. However, if your screen flashes a warning, don’t panic. Here’s a breakdown of potential alerts and their quick fixes:

  • Throttle Warning: This pops up if your throttle stick (the left one for Mode 2 radios) isn’t at its lowest position when powered on. Pushing it all the way down will get rid of this warning.
  • Switch Warning (also known as Control Warning): This signals that some switches aren’t in their default positions. To clear this, ensure all switches are in their HIGH position
  • Alarms Warning: This appears if the Sound mode is set to mute. If you configure this on purpose, you can press the Enter button (scroll wheel) to safely skip this warning.
  • SD Card Warning: This indicates a version mismatch between the SD card content and firmware.
  • If you get this warning, follow this guide to fix it

If everything goes well, you should be greeted by the radio’s default home page.

Radiomaster Pocket Radio Transmitter Stand

Radio Settings

The Radio Settings are where you’ll adjust your display, audio, system related parameters, and so forth.

Kick things off by pressing and holding the SYS button; this will take you to the TOOLS page. From there, hit the PAGE> button twice to scroll to the Radio Setup page.

Radiomaster Pocket Radio Transmitter Setup Radio Settings Batt Range

I’ll walk you through the initial changes you might want to consider. Anything I skip over can be left default.

1. Set Date & Time.

2. Battery Range:

  • For Li-ion battery: 6.4V – 8.2V
  • For Lipo battery: 7.4V – 8.2V

Why these ranges? This setting defines the battery indicator on-screen, specifically when it displays as full or empty. You might wonder about the minimum 6.4V for a 2S Li-ion, which can indeed be discharged even more. Yes, you can set it to 6.0V. However, having it a tad higher offers an earlier visual cue. As for the 8.2V max (instead of 8.4V), it’s due to voltage sag. The moment you power up, the battery’s voltage drops slightly. You will never see 8.4V on screen, so think of 8.2V as “fully charged.”

Sound:

  • Mode: Opt for “All” to hear “beeps” when navigating the menu. Alternatively, go with “Nokey” if you prefer more silent operation.

Contrast (backlight brightness): 15

Why? It offers sharp text clarity without that pesky “black ink” background effect.

Alarms:

    • Battery low (threshold for audio and haptic warning, if you fly long range you might want to set this higher so you have enough battery to make your way home.)
      • For Li-ion: 6.4V
      • For Lipo: 7.4V
    • Inactivity: 10 minutes (if the radio is left untouched for this duration, you will hear the “inactivity alarm” audio reminder)

Backlight

  • Mode: “Keys”
  • Duration: 15 seconds (backlight stays lit for this duration)
  • Brightness: Keep it minimal to conserve battery life.
  • Alarm: Enabled (so the backlight turns on with any radio warning)

Why Keys Mode? By default, both the sticks and buttons can activate the backlight, which is a touch excessive. You aren’t really looking at the screen when flying so it’s just wasting battery. By setting it to “Keys,” only the menu buttons will activate the backlight, conserving energy.

Pwr On delay: 1s

This is the time it takes to hold down the power button to turn on the radio.

Pwr Off delay: 1s

This is the time it takes to hold down the power button to switch off the radio, this is a safety feature to avoid accidentally turning off the radio. I personally set it to 1s for faster shut down, but if you want to play safe you can set it longer.

USB mode: “Ask”.

Head over to the Hardware page by pressing the PAGE>, scroll down to Int. Module. If you’ve got an internal ELRS module, set it to CRSF with a Baudrate of 5.25M. If you have the internal multiprotocol module, set this to Multi. It’s generally configured correctly by default, but always double-check.

According to ExpressLRS Wiki, Radiomaster Internal ELRS module can handle 5.25M baudrate. But just because you can set the Baudrate higher, doesn’t mean you should. If you’re experiencing constant Telemetry Lost/Recovered even with the receiver nearby and/or if the Lua Script fails to load properly, then it’s a sign your radio and/or module cannot work on the selected Baud Rate. Lower it down a notch and test again. Or settle with a 400K baud rate.

Lastly, within the Hardware page, ensure the ADC Filter is turned off (unticked). Why? see this section.

Adjusting Gimbal Tension

To customize your control experience, the Pocket allows you to adjust gimbal spring tension from the back of the radio (through the holes in the back housing). However, I found that the process can be a bit challenging since the screws for adjustment are deep inside the radio.

I’d recommend taking off the back housing (there are only 4 screws). This grants direct access to the gimbal spring screws, making the process a breeze. And the best part? Once it’s set, you likely won’t have to fiddle with it again.

Radiomaster Pocket Radio Transmitter Tear Down Front Back Housing

A heads-up, though: for these adjustments, you’ll need a 1.5mm hex tool. It’s a slight shift from the Philips screws common in older gimbals.

Here’s a breakdown of where the gimbal tension screws are for roll, pitch, yaw and throttle.

Radiomaster Pocket Radio Transmitter Gimbal Tension Adjustment Screws Roll Pitch Yaw Throttle Tighten Loosen

Gimbal Calibration

Before flying with your brand new radio, you should always calibrate those gimbals. You might also want to do this if you’ve recently updated your EdgeTX/OpenTX firmware.

Navigate to the Radio Setup page, then hit the “PAGE>” button a few times till you land on the “HARDWARE” page. From there, select the “Calibration” option. This will initiate the calibration process for both the sticks and sliders. The on-screen instructions are clear, so just follow along.

Radiomaster Pocket Radio Transmitter Setup Calibration Gimbals

Make sure you only move the sticks as shown in the following image. For best result, avoid moving the sticks in circle. Be as gentle as possible when pushing the sticks, so the radio reads the end points correctly.

While you’re at it, don’t forget to calibrate the slider too (top right rotary control – S1).

Battery Voltage Calibration

To ensure you’re getting the most precise battery reading possible, take a moment to calibrate your radio’s battery voltage.

With a digital multimeter in hand, measure the voltage of the Li-ion batteries inside your radio. Given that the cells are connected in series, you should expect a reading between 6V to 8.4V. The goal is to make sure the measurement on your multimeter matches the one displayed on your radio.

Navigate to the “HARDWARE” page. Once there, scroll down until you find the “Batt. calib” (Battery Calibration) option. Get the reading here as close to your earlier measurement as possible using the radio’s wheel button.

Radiomaster Pocket Radio Transmitter Setup Calibrate Battery Voltage Multimeter

Model Profile

The Pocket comes with 4 pre-created Model profiles that cater to different types of models. All you need to do is pick one that suits your needs. To see what models profiles are available, you can go there by holding down the MDL button.

Radiomaster Pocket Radio Transmitter Setup Model Profile Mixes Channels

For FPV drones, you can use the “Pocket” profile. It has everything you need setup out of the box – internal RF module (ExpressLRS) enabled and all controls and switches mapped to the right channels in MIXES. You may not even have to tweak a thing. Just bind the receiver in your drone to the radio, and you’re good to go.

Creating a Profile for FPV Sims

Planning on immersing yourself in an FPV simulator? Consider creating a dedicated model profile for this purpose.

Radiomaster Pocket Radio Transmitter Setup Fpv Simulator Model Profile Internal External Rf Disabled Off

To do this, start with copying the existing Pocket profile and make a duplicate. Go to Model Setup and rename it to something else such as “FPV Sim”.

In Model Setup, scroll down and switch both “Internal RF” and “External RF” to OFF. This will save battery life when you are playing FPV sim and prevents the internal RF modules from getting hot.

Backup and Restore Radio

I recommend backing up your radio settings regularly (e.g. before firmware updates and whenever you make big changes). Fortunately, with EdgeTX, backing up and restoring your Radiomaster Pocket’s settings is simple and hassle-free.

Follow instructions here to backup and restore your radio SD Card Content: https://oscarliang.com/backup-restore-models-radio-settings-edgetx/

Easy Backlight Control

Your Radiomaster Pocket is equipped with a rotary control in the top right (S1), which is not used for most people. We can turn it into a backlight control. The trick is to create a function in the radio. You can either do this in “Special Functions” in the Model Profile, or “Global Functions” in the System menu. I prefer to do this in Global functions because it works across all model profiles, saving you the need to set them up individually for each profile.

Radiomaster Pocket Radio Transmitter Setup Global Function Backlight Slider

  1. Navigating to Global Function: Hold down the SYS button, then a few taps of the “PAGE” button will take you to the “Global function” page.
  2. Creating Function: Find a empty slot and select “ON”.
  3. Setting Up Backlight Control: In the 2nd parameter, select Backlight, in the 3rd parameter, select the rotary control by moving it with your finger, and enable it.

You can also use it to control audio volume by selecting “Volume” instead of “Backlight”,

Updating EdgeTX

Backup your SD card first before updating EdgeTX.

1. Checking Firmware Version: Navigate to the system menu by heading to Radio settings => Versions. This step helps identify the version currently running on your Pocket and whether you need to update.

2. Using EdgeTX Buddy: This online tool is the most user-friendly method for updating the EdgeTX firmware. For a detailed step-by-step guide on using it, refer to: https://oscarliang.com/flash-edgetx/.

3. Restore to Original State: Mistakes happen. But, fear not! If anything goes wrong, the stock EdgeTX firmware for the Pocket is available in the FIRMWARE folder. You can always revert to this original state by re-flashing the radio.

Updating Internal ExpressLRS Module

If you have the ExpressLRS (ELRS) version, updating the internal module is easy. The procedure is identical to the Zorro: https://oscarliang.com/update-zorro-elrs-firmware/. Here’s a summary:

  1. Connect the Pocket to your computer using the top USB-C port. Opt for the “USB Serials (VCP)” mode.
  2. Run ExpressLRS Configurator, in the progrom, choose Radiomaster as the device category and select Zorro as the device.
  3. Build Options:
    1. Go with EdgeTXPassthrough as your flashing method.
    2. Set your regulatory domain. For instance, use ISM_2400 for FCC users.
    3. Input your unique binding phrase
  4. If flashing via USB, click “Build & Flash”. If flashing via Wi-Fi, click “Build” and follow the Wi-Fi flashing steps.

If your Pocket uses a CC2500 multiprotocol module, then you need to follow these instructions to update it: https://oscarliang.com/flash-edgetx/#update-internal-multi-protocol-module

Tips and Tricks

Custom Sound Pack

Bored of the default voice prompts? Try custom sound packs. Amber Sound Pack, for instance, stands out with its superior sound quality.

Download: http://open-txu.org/home/version-2/v2-2-resources-2/

After downloading, extract the files and replace the originals in the SOUND/en folder on your SD card.

Playing Custom Sounds

Did you know you can play custom sound files, even your favorite tunes, on any EdgeTX radios? If you’re new to this, here’s a tutorial to create custom sound files for OpenTX radios, the same steps apply for EdgeTX: https://oscarliang.com/taranis-play-sound-track-mp3-files/

Filename limits: Ensure the filename is no more than 6 characters, with the file extension capped at 3 characters. Also, dodge any special symbols in the name. The ideal file format: 32000kHz Mono Wav.

Exploring the Tools Page

The Tools page on your Radiomaster Pocket is a collection of useful LUA scripts. One frequently used LUA script is ExpressLRS, which allows you to configure your ExpressLRS module.

Radiomaster Pocket Radio Transmitter Setup Tools Expresslrs Lua Script

Button Cell Battery Replacement

Radiomaster Pocket Radio Transmitter Tear Down Pcb

If your Pocket is constantly forgetting the date and time settings, it likely points to a dying button cell battery. Look for a Lithium 3V CR1220 battery. Conveniently, you can get them online, for instance on Amazon (affiliate link): https://amzn.to/3yDyDBe

Conclusion

We hope this guide has been helpful in setting up your Radiomaster Pocket radio. I will be updating this guide if there are other useful mods and upgrades to the Pocket.

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42 comments

Sega 13th April 2024 - 3:06 pm

Thank you Oscar!

Reply
Charlie 9th April 2024 - 9:44 am

Any way to debounce or replace the sd and sa switches, they give false positive with a light touch, it’s sketchy.

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Oscar 9th April 2024 - 4:41 pm

Doesn’t look like it’s an easy repair as the switches are soldered to the main board. Maybe see if you can open the radio and check the buttons if it’s mechanical issue you can easily fix? Otherwise I would suggest reaching out to both the seller you bought the radio from as well as Radiomaster and see if they can sort something out (like getting a replacement board maybe?)

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Ethan 9th March 2024 - 3:18 pm

Thanks for the guide! Is there any way to reset the Pocket to factory settings without reflashing?

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Julie 15th February 2024 - 9:51 am

Hello!

After do the configurations, when trying to connect to Mac and play liftoff, the simulator don’t detect the radiomaster pocket.
Better to say, that detected, but don’t work the sticks…

Could you help me?

Thanks!

Julie

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Oscar 15th February 2024 - 5:32 pm

Can you go to Model Setup, and ensure USB mode is set to “Ask”?
https://oscarliang.com/opentx-usb-joystick-mass-storage/

Then you must select joystick when prompted on the radio.

If computer sees the radio but no stick movement, can you try a different profile on your radio? Or create a new one.
Also try to recalibrate the radio.

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ReviewD 6th February 2024 - 1:43 am

The article needs a counterpart section to “Updating Internal ExpressLRS Module” for updating CC2500 version, especially with the finicky FrSky Archer reveivers that have a narrowed band of frequency tuning.

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madrulzzz 2nd February 2024 - 8:24 pm

Just brought a Radiomaster Pocket. Along with it got 2 Molicel 3.6V 18650 cells as 3.7V was not available. One of the battery in your suggested list is 3.6V. But in the manual it says “POCKET is powered by 2x 3.7V 18650 Lithium Ion cells. Never charge 3.6V LiFe and 3.6V 18650 Lithium Ion packs with the onboard charger.” Is this really a concern?

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Oscar 5th February 2024 - 3:54 pm

Both should work fine with the pocket and shouldn’t be a concern.

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Khan 26th January 2024 - 8:51 pm

It was a very useful explanation, thank you for your efforts, Oscar. I found most of the items that I could not find in this article.

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glyn 26th January 2024 - 1:01 am

my telemetry button just says syntax error, i cant see a fix for it, any help ?

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Vic 9th January 2024 - 1:03 pm

I have a Pocket cc2500 version. I’d like to bind to the meteor 65 frsky version. I can’t bind it, because by the type of frsky x I can’t find the d16 subtype.
What can I do?

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Khan 26th January 2024 - 8:53 pm

For Frsky d8 or d16, you must bind from the betaflight screen. If you are looking for frsky D16 via the remote control, it will be written as frskyX.

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dario salas 29th November 2023 - 5:48 pm

Oscar buenas tardes, espero te encuentres bien, podrias decirme si radiomaster pocket tiene puerto Uart? en caso de que tenga, podrias indicarme donde esta?

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Dumitru 19th November 2023 - 2:28 pm

Hi, thanks for information about this product. Very useful. I want to know if I can install OpenTX on this device ? Best regards !

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Oscar 20th November 2023 - 6:54 am

OpenTX has not been updated since Apr 2022 and it doesn’t support this radio currently. Just use EdgeTX, it’s a better and more modern firmware.

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Charlie 18th October 2023 - 11:41 pm

I screwed up the radio settings. How do I factory reset my Radiomaster Pocket?
Very frustrating.

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Oscar 19th October 2023 - 4:30 pm

You could try resetting the radio (but that will take all settings back to EdgeTX default so best to backup your radio first before doing it):
Switch on your transmitter.
Long press the MENU button.
Keep pressing the PAGE button until you get to the Version page.
Scroll down to the very bottom where you should find a [Factory reset] option.
Select that option and then confirm you want to continue.

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Ric 24th September 2023 - 8:27 am

Hi Oscar! Can we change this to mode 4? If so, how? How about sa lite v2, can we change it to mode 4?

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Rick Martin 15th September 2023 - 5:05 pm

Can the Pocket be converted to mode 1 like my TX16s ?

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Oscar 23rd September 2023 - 2:47 pm

The pocket is switchable between Mode 1 and Mode 2. Go to this page (https://www.radiomasterrc.com/products/pocket-radio-controller-m2?sca_ref=1640957.8JiFIIBnBe), scroll down to “Gimbal adjustment” and see where the screw is for this mode switch.

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Guilherme bovo 11th September 2023 - 2:59 am

Hi Oscar, thanks for the tutorial! I have a question, before of performe calibration the radio was showing 100 for each direction of gimbal. After calibration in the throttle and pitch now is showing max of 97. Is it normal? I performed some times calibration again and the number 97 keeps. Thank you!

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Oscar 11th September 2023 - 4:27 pm

Where do you see 97?

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sam 3rd September 2023 - 8:35 am

ah but after dowloading open tx this radio is not on the list, only the zoro and boxer so how do I uodate firmware for it beacus e it wont connect anymore to my speedybee v2,?
thanks

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Tom Meyer 5th September 2023 - 1:24 am

Pocket ELRS firmware and sdcard contents: drive.google.com/file/d/1Lno7aI-CM7pDek4a9K6ePXaZI5yJNUQP/view?pli=1

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Max W 7th September 2023 - 4:16 am

You legend.

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Matt 14th November 2023 - 8:03 am

Hello Oscar. Is it possible to change LBT version to FCC?

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Oscar 14th November 2023 - 3:05 pm

Yes, you just need to select the right build options and flash your TX module again, see Regulatory Domains option here: https://oscarliang.com/setup-expresslrs-2-4ghz/#Building-ELRS-TX-Firmware

Max W 7th September 2023 - 4:17 am

I bought mine from AliExpress and EdgeTX wasn’t installed properly, these folders fixed my problem

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Tod Wulff 3rd September 2023 - 2:08 am

Good day, Sir Oscar. I hope you and yours are well.

Question (wrt EdgeTX for Pocket): I am not able to find a FW on the EdgeTX buddy tool that says it is for the Pocket. Is this because it is so new and one just needs to be patient, or is it there and I am simply looking in the right place?

Also, I don’t see the pocket listed here at this time: https://edgetx.org/supportedradios , and am interested in updating to 2.9.0. Please advise if you know how one might get EdgeTX v2.9.0 for the RM Pocket. TIA.

-t

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Oscar 3rd September 2023 - 2:06 pm

I could be wrong but I think Pocket will be added in 2.10. For now you can just stay on the stock firmware.

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MegaHurtz 3rd September 2023 - 1:58 am

Yeah, I too had this issue. Not due to my following any recommendations herein, but rather hunting out good Samsung 35E 18650 3500mAh 8A -Protected Button Top batteries and then realizing they wouldn’t fit. Who knew 18650 batteries purchased from the venerable 18650batterystore.com weren’t actually 18mm x 65.0mm.?. lol!

Anyways, daily operational capacity trumped one-time install convenience, so I modified the battery compartments (hacked down the positive tab, cut down the negative spring, and removed the dogs on the negative side of the battery) to receive these bigger batteries. Am glad I took the time to do so. Pic: https://i.imgur.com/EwAbVrt.jpeg

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Shaun 27th September 2023 - 12:58 am

1st off fantastic setup and explanation of the RM Pocket! After following the setup instructions everything went fine until I turned off the controller and turned it back on, now I receive a low power mode alarm no matter the chrage level. Any suggestions? Thanks in advance!

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Oscar 28th September 2023 - 6:13 pm

In model setup, under RF Module, there’s a low power mode option, maybe you enabled it by accident?

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Tom Meyer 31st August 2023 - 9:38 am

The 18650 batteries you list as working in this radio don’t fit. You need a lower capacity in the range of 1500-1800 mha. All your listed are 2600 and up. Size is too big!

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Oscar 3rd September 2023 - 1:41 pm

18650 batteries are all the same size. In fact the number 18650 is the dimensions of the battery.

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Fritz 29th August 2023 - 4:30 pm

Hi Oscar! One hint: SD-card for the Pocket should be formatted as FAT, not FAT32. I have tried to replace the original SD with a copy on a 16GB SD wich can only be formatted as FAT32. But this does not work properly.
Thanks for your fantastic work.

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Josiah 26th January 2024 - 9:44 pm

I was able to replace my SD card on my Pocket with an 8GB card formatted in FAT32. There were no issues. I simply copied my files from the original card, pasted them into my new SD card, and once inserted the controller looks/acts no different from before. One of the only things I can think of that would prevent you is that the overall volume of your 16GB card might be too large for the pocket to handle, but 8GB is not.

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Jesse Flannery 26th August 2023 - 4:41 pm

Are the gimbals replaceable for hall sensor versions?

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luca 26th August 2023 - 12:47 pm

Hi Oscar, Would you be able to share the factory “radio.yml” file in the radio folder of the original SD card as I managed to overwrite settings with companion software but unfortunately from a different radio.
many thanks for all your fantastic work.
Luca

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bader 16th August 2023 - 7:54 am

The Tools page on your Radiomaster Boxer is a collection of useful LUA scripts.

Do you mean pocket?

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Oscar 16th August 2023 - 1:35 pm

Ah yes :) I meant the Pocket! thanks for the correction.

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