A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX
A03 400mW 5.8G VTX

A03 400mW 5.8G VTX

Regular price $24.99 USD Save $-24.99 USD

A03 400mW 5.8G VTX, a video transmitter with OpenVTx firmware, supports both the SmartAudio and Tramp protocols. It features PIT/RCE/25mW/100mW/400mW adjustable output power for different use. With the 26*26mm mounting hole size, it is suitable for whoop or toothpick drones like X-Knight seriesBeta85X/95X seriesTWIG series, and Pavo25, Pavo25 V2, Pavo30, Pavo35.

Know More About OpenVTx

Big thanks to Jye Smith and all contributors for their time and energies to OpenVTx project.

OpenVTx refers to open source video transmitter firmware for the FPV community, which aims to provide firmware with both the SmartAudio and Tramp protocols. Either protocol can be used on the flight controller and on VTx power up the protocol used is automatically detected by OpenVTx. For more information, you can know it from OpenVTx GitHub.

Bullet Point

  • An open-source video transmitter with OpenVTx firmware. The A03 VTX supports SmartAudio and Tramp protocols. Through these protocols, the flight controller is able to adjust the video transmitter settings, which are the power, the band, and the channel of the transmission.
  • A03 VTX is a high-quality 5.8GHz VTX with strong anti-interference ability and stable transmission. Comes with PIT/RCE/25mW/100mW/400mW adjustable output power, allowing the perfect amount of output power to be selected based on your FPV needs.
  • Overall weighing 4.9g with a small-size layout, A03 VTX comes with a 26*26mm mounting hole and is perfectly suitable for whoop or toothpick drones like the X-Knight seriesBeta85X/95X seriesTWIG series, and Pavo series drones. 
  • Featuring a fixed mounting hole and 6-pin connector, less solder work needed, which makes it’s super easy to install.


      • Item: A03 5.8G VTX
      • Output power: PIT/RCE/25mW/100mW/400mW (10-26dBm)
      • Supply voltage range: 7-35V
      • Current (8v): <300mA (400mW)
      • Weight: 4.9g (excluding antenna)
      • VTX size: 30.34*30.34*4.6mm
      • Mounting Hole Size: 26*26mm
      • Antenna: Air Antenna (MMCX Straight)
      • Frequency: 5.8GHz 48 channels
      • Raceband: 5658~5917MHz
      • Channel SEL: SmartAudioV2.0 & Tramp
      • Modulation type: FM
      • Antenna port: 50 Ω
      • Operating temperature: -10℃~+60℃
      • Recommend drones: 26*26mm mounting hole, Pavo seriesX-Knight seriesBeta85X/95X series, and TWIG series

      Comparison to BETAFPV VTX Series

      One of the best VTX on BETAFPV VTX Series. A03 400mW 5.8G VTX is a video transmitter with OpenVTx firmware and supports both the SmartAudio and Tramp protocols. Besides, A03 VTX sports a better cost performance and comes with OpenVTx firmware, which supports adjustable output power and frequency, in contrast to A02 VTX. In a word, A03 VTX works perfectly without any reduction in performance or power.

      A03 VTX M02 VTX M03 VTX A02 VTX
      Mounting Hole 26*26mm 26*26mm or 14*18mm 14*18mm 26*26mm
      Max Output Power 400mW 350mW 350mW 800mW
      Supply Voltage Power 7-35V 4.5-5.5V 4.5-5.5V 7-35V
      Protocol SA&Tramp SmartAudio
      Firmware OpenVTx BETAFPV VTX System
      Compatible Drones Whoop & Toothpick Drones 3-5 inch Drones 65-85mm Whoop Drones Whoop & Toothpick Drones

        Diagram for A03 VTX

        Below is the diagram picture for A03 400mW 5.8G VTX.

        Band & Channel & Power Settings for A03

        The band, channel and power for A03 400mW 5.8G VTX can be changed by the OSD menu only. Enter the OSD menu by radio transmitter sticks ( Pitch Stick UP and Yaw Stick Left), then select FEATURES -> VTX SA to change the frequency and power.

        LED status is shown below. VTX mode (band/channel/power) LED indication is similar to TBS's approach.

        Below is the frequency table for A03 400mW 5.8G VTX.

        Betaflight CLI for SmartAudio or Tramp protocols can be obtained from here:


        Active and Exit the PitMode

        Set PIT ON or OFF on OSD menu.

        Active and Exit the RACE Mode

        When at a race event and using pitmode on a switch with Betaflight, select the RCE VTx power level. It will force pitmode on boot and only use 25mW. Select POWER and set RCE mode on OSD menu.


          • 1 * BETAFPV A03 5.8G VTX
          • 1 * 6-Pin FC Cable
          • 1 * Air Antenna(MMCX Straight)
          • 3 * Anti-Vibration Rubber Dampers

          Betafpv.com offers a (30) day manufacture defect warranty, starting from the date the product(s) was delivered to the customer. If more than 30 days have passed since receiving your purchase, unfortunately we can’t offer you a refund or exchange.

          For merchandise was confirmed as genuinely defective(Product Design problem & Quality issues), we will ship out a replacement free of charge directly. The consumer will not be charged any fees for approved warranty service.

          In almost all cases, we will work with you to debug your issue firstly. 

          Each claim should have all proof of defect by mean of photo or video showing clearly the defect of the product. Please create a ticket to send us photos or video of your product, a detailed description of your issue, and a description of what you have already done to fix it. We are happy to solve any problem you may meet.

          NOTE: The refund amount is limited to the purchase price of the item.

          Directly Send Ticket: Create a new ticket

          *We do not accept ALL kinds of returns.

          *All sales are final.

          1.Shipping Time and Rules

          1.1 Estimated Shipping Time

          Expedited Shipping: 3-7 working days

          Standard Shipping (Registered Mail): 12-30 working days

          Please note:

          • There are estimated delivery time only, so BETAFPV can not guarantee an exact delivery time.
          • The estimated delivery time may be longer if any battery is included in your order.
          • If an item is out of stock, typically it takes 1-2 or more weeks to ship.
          • Incorrect information that objects to the below 1.5 Address Information Requirement may result in unsuccessful delivery and delays in receiving your package.

          1.2 Track Package

          After the order is shipped, you will receive a notification email containing the tracking number (you need to register BETAFPV website when placing the order).

          Or log in to your BETAFPV account and look at your order history which will show if it was shipped and provide a tracking link, if available, given your selected shipping methods. If your order status shows shipped but you do not see tracking that means your order is packaged and will be shipped shortly. If your status is processing it means that we have received your order and will be shipping as soon as possible.

          You can also enter the tracking number to check your package shipment status below. Please contact BETAFPV customer support for help if you are not able to track it.

          1.3 Batteries Shipping

          Some countries or remote regions are forbidden to ship stand-alone batteries due to restricted Customs rules.

          We will notify you if we are unable to ship batteries to your location. For expedited shipping like DHL, stand-alone batteries are prohibited to be shipped.Devices packed with less than or equal to two batteries like drones are available to be shipped. Devices in which Batteries contained like transmitters or goggles are accepted to be shipped without limits.

          Battery Type Definitions

          • Stand-alone: Package ONLY contains batteries or cells; NO equipment
          • Packed with: Package contains equipment + cells or batteries that are NOT installed in the equipment. For example, BNF drones with batteries or RTF drone kits.
          • Contained in: Package has lithium batteries contained in equipment (properly installed in the equipment they are intended to operate). For example, radio transmitter or goggles.

          1.4 List of Countries or Region That Prohibit From Importing Drones or Batteries

          Choosing standard shipping will be restricted.

          Asia: India, Indonesia, Malaysia, Vietnam, Philippines, Pakistan, Oman

          Africa: South Africa

          Region(Prohibit batteries): Hawaii, Puerto Rico, APO/FPO

          Note: It will be available for drones shipment if you would like to choose expedited shipping like DHL.

          1.5 Address Information Requirement

          For orders from below countries or regions below, address information has specially required. Please carefully read the following information. Incorrect information may result in unsuccessful delivery and delays in receiving your package.

          Special Regions: Orders with military or government addresses in Russia and Ukraine cannot be shipped. We reserve right to cancel the order and provide a full refund.

          Ukraine: Due to logistical restrictions, we are currently unable to ship any drones including any FPV Kits to Ukraine while batteries, frames, and other accessories can still be shipped.

          If you wish to purchase drones or kits, we apologize for the inconvenience and recommend either waiting for updates on shipping or removing the drones or kits in your order, or you could also considering purchasing from our authorized agent in Ukraine (https://rc-store.com.ua)

          Germany: Please ensure that the street address and house number information is provided in full. Omissions are not allowed.

          Japan: Please provide the full street address and house number information. Abbreviations with only numbers are not permitted.

          Australia: Please provide the correct postal code that matches the city, and ensure that the city name is written correctly without any omissions or abbreviations. Search postcodes for all suburbs and locations around Australia here. (https://auspost.com.au/postcode)

          Hong Kong or Macao: Please fill address and name in Chinese (traditional).

          Taiwan: Please fill address and name in Chinese (traditional), and provide personal ID number due to Customs requirement.

          South Korea: Please provide personal clearance code. You can apply for it from the below link if you do not have one. https://unipass.customs.go.kr/csp/index.do

          Brazil: Please provide your tax number (CPF) in your address.

          Chile: Please provide your individual tax number in your address.

          India: Please provide your Adhaar Card/Pan Card/KYC number in your address. Provide tax number if you place order as company.

          PO Boxes/APO/FPO Addresses: Shipments to PO Boxes, APO, FPO may be declined.

          1.6 BETAFPV Assume No Responsibility For Delayed Or Rejected Orders Due To The Following Reasons

          • Shipping time might be delayed for 3-7 days for transportation to remote regions. It might be 7 days longer if ships to islands area like Hawaii, Puerto Rico, Canary Islands etc.
          • Delay or delivery failure because of the consignee’s actions. These actions include, but are not limited to: changing the address after shipment, entering an unknown address or wrong address, entering incorrect contact information, and refusing to receive, etc.
          • Delay due to force majeure. “Force majeure” means an unforeseen, inevitable, or insurmountable objective situation and other objective conditions that cause delayed shipping, including, but not limited to: national or regional air or ground transportation system controls or interruptions (e.g., weather reasons), communication system interference or malfunction, government actions, postal administration policy changes, wars, earthquakes, typhoons, floods, fires, heavy rain, heavy fog, and other similar events.
          • Mail and packages cannot be delivered to the consignee’s address during weekends, national holidays, and festivals.
          • The consignee address is a school, hotel, unit, or residential community where the courier has no access. Please provide a permanent street address.

          *Please confirm your address before payment. If you enter the wrong address, please contact BETAFPV customer support in a timely manner.

          2.Shipping Method and Fee

          2.1 Standard Shipping

          We offer free standard shipping on orders of $99.99 or more. If your order does not qualify for free shipping, the shipping fee will be charged $5 on orders of $20 - $99.98; charged $10 on orders of less than $20. (Shipping fee will be different when delivering to remote countries/regions.)

          Products with big volume are excluded from free shipping rule due to dimensional weight calculated by shipping company.

          The product collections list is as follows:

          2.2 Expedited Shipping

          We offer expedited shipping service worldwide including islands area. The shipping fee will be shown on the check-out page once the expedited shipping method is chosen.

          Note: Purchasers are responsible for customs duties, taxes, customs clearance and other costs incurred when choosing expedited shipping.

          2.3 Additional Shipping Fee

          There are certain situations where you may be required to pay extra shipping fees.

          Expedited Shipping with Batteries: When choosing expedited shipping and placing an order that includes more than 2 batteries, which unfollows the 1.3 Batteries Shipping policy, an extra shipping fee will be applied to cover the separate shipping of the batteries.

          Reshipping Costs: Packages returned due to incorrect customer-provided addresses or the customs clearance cannot be completed due to customer-related issues, need to be reshipped will be subject to an additional shipping charge.


          3.1 How long until my order ships?

          All orders will be processed within 1-2 working days after your payment.

          If we are experiencing a high volume of orders or some products on back order, shipments may be delayed by a few days.

          If there will be a significant delay in the shipment of your order, we will contact you via email. Please make sure your email address is available and remember to check the email for the notification.

          3.2 After I place an order, how do I change my order before shipment?

          The nation cannot be changed once an order has been placed. If you need to change these details, please cancel the order and purchase again. Please contact BETAFPV customer support in 24 hours after placing the order if you need to change order product information or address.

          3.3 How do I cancel after I have placed the order, but it has not shipped?

          You can contact BETAFPV customer support for canceling if your order has not been shipped. If your order has been shipped less than 24 hours, please contact the customer service to help. We will try to hold your order from the shipping company.

          It is impossible to cancel if your order has been shipped over 24 hours.

          3.4 Under what circumstances will BETAFPV cancel an order unilaterally?

          Product(s) unavailable currently, BETAFPV tries to contact customers and does not get a reply in 7 days.

          High-Risk Order(s) identified by Credit Card bank or Paypal. To ensure your card safety, we will cancel your order.

          No Shipping Methods. If we are not able to ship to your location, Your order will be canceled.

          *The right of final interpretation of the shipping policy resides with BETAFPV

          *Policy information updated Feb 2024

          Customer Reviews

          Based on 2 reviews
          Alfred Florian
          Alles OK

          Alles OK

          Martin S.
          awesome VTX

          this VTX is really great.
          It was super easy to integrate it into my build (i am using a BetaFPV F411 AIO FC)
          The two plug connectors make it easy to attach and detach the VTX on the drohne.
          It delivers a super stable image to the googles!

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