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.

      Specification

      • 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:

        https://github.com/OpenVTx/OpenVTx

        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.

          Package

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

          Shipping Method & Delivery Times

          We offer the following shipping options:

          Expedited Shipping: Estimated delivery in 3-7 working days via DHL/FedEx.

          Standard Shipping: Estimated delivery in 12-30 working days via registered mail.

          Please expect a processing time of 1-2 business days (Mon–Fri, excluding holidays).

          IMPORTANT:

          • Delivery estimates are not guaranteed and may vary due to shipping address, customs clearance and carrier delays.
          • Battery orders: Expect more business days for safety inspections.
          • Out-of-stock items: Ships in 1–2 weeks (we’ll notify you via email).
          • Address errors: Double-check your shipping details during checkout. Incorrect/missing addresses cause delays or failed deliveries.

          Shipping Costs

          1. Standard Shipping

          We offer free standard shipping on all orders of $99.99 or more. For orders between $20 – $99.98, a flat rate of $5 applies. For orders under $20, a flat rate of $10 applies.

          IMPORTANT: Starting April 24, all U.S. orders will include a flat $10 fee to offset recent increases in shipping costs and tariffs. To learn more details, check U.S. Tariff Policy Change: What You Need to Know.

          2. Expedited Shipping

          We offer expedited shipping service worldwide including islands area. Shipping fees are calculated automatically at checkout based on your location and order weight.

          IMPORTANT: Customers are fully responsible for customs duties, taxes, customs clearance and other costs incurred when choosing expedited shipping. If a shippemnt is returned due to unpaid import fees, return shipping costs will be charged to the customer, and no refunds will be issued for the original order.

          3. Additional Shipping Fee

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

          • Products with large dimensions or weight: Products with large dimensions or weight are excluded from free shipping rule due to carrier dimensional weight calculations. (Including: FPV Goggles, BETAFPV Gates & Flags, RTF FPV Whoop Kits, LiteRadio Series radio transmitter, Storage Cases)
          • Remote countries/regions: Orders shipped to remote countries or regions (e.g., islands, rural areas) may require adjusted shipping fees based on carrier surcharges.
          • Expedited Shipping with Batteries: Expedited Shipping orders containing more than 2 batteries that exceed the limits outlined in our Battery Shipping rule below will incur extra fees to cover separate battery shipments.
          • Reshipping Costs: Packages returned due to incorrect addresses or customs clearance failures (e.g., unpaid duties) will be subject to reshipping fees. Customers must cover these costs before redelivery.

          Shipping Rules

          1. Battery Shipping

          Some countries or remote regions are forbidden to ship stand-alone batteries due to restricted customs and safety regulations. If your location restricts battery shipments, we will notify you promptly and adjust your order accordingly. Review the 2. Countries/Regions Where Battery or Drone Shipping Is Restricted below for details.

          Expedited Shipping Battery Shipping: Stand-alone batteries are prohibited for expedited shipping. However, drones packed with less than or equal to two batteries or devices with bulit-in batteries (e.g., transmitters, goggles) may still qualify for expedited delivery.

          Battery Type

          International Expedited Shipping

          No batteries

          Accepted

          Contained in

          Accepted

          Packed with (no more than 2 batteries)

          Accepted

          Stand-alone

          Prohibited

          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.

          2. Countries/Regions Where Battery or Drone Shipping Is Restricted

          Due to customs regulations and carrier restrictions, we cannot ship drones or batteries to the following destinations:

          • Drones Restricted: Brazil, Saudi Arabia
          • Drones & Batteries Restricted: Armed Forces Europe (APO/FPO/DPO), P.O. Box, Dominican Republic, Maldives
          • Batteries Restricted: South Africa, Cyprus, Cote d'Ivoire, Brunei, India, Argentina, Turkey, Serbia, Iceland, Guadeloupe, Georgia, Belarus, Bosnia and Herzegovina, Montenegro, Saint Barthelemy, Oman, Armenia, Qatar, Costa Rica, Kuwait, Jamaica, Malta, Jersey, New Caledonia, Kyrgyzstan, Burundi, French Guiana, Mauritius, Greenland

          Note: The list is subject to change without prior notice due to evolving customs regulations, carrier restrictions, and local legislation.

          3. Address Requirements

          To ensure successful delivery, please carefully follow these requirements based on your location. Incorrect or incomplete information may cause delays or failed deliveries.

          Japan & Germany: Street name and number, apartment/unit number (if applicable) are required. Omissions are not allowed.

          Australia & United States: Provide the postal code that matches the city, and ensure that the city name is written correctly without any omissions or abbreviations.

          Hong Kong, Macao, Taiwan, and Mainland China: Address must be written in Chinese characters.

          Tax ID Required for Customs Clearance for orders to the following countries:

          • South Korea: Personal Clearance Code
          • Brazil: Cadastro de Pessoas Físicas (CPF)
          • Chile: Tax Identification Number (RUT)
          • India: Aadhaar Card/Pan Card/KYC number
          • Mexico: TAX ID (RFC) / Personal ID (CURP)
          • Indonesia: Nomor Pokok Wajib Pajak (NPWP)

          Delayed Or Rejected Orders Liability

          BETAFPV is not liable for delayed or rejected packages resulting from circumstances beyond our reasonable control. This includes, but is not limited to:

          Delays of shipments to remote regions: Shipping time might be delayed for 3-7 days to remote regions or over 7 days to island destinations like Hawaii, Puerto Rico, Canary Islands, etc.

          Customer-caused delay or delivery failure: These actions include, but are not limited to address changes after shipment, incorrect/incomplete addresses, invalid contact information, and refusal to accept delivery, etc.

          Force majeure: It means 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.

          Packages cannot be delivered to your address during weekends, national holidays, and festivals.

          The 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 corrections are needed, please contact BETAFPV customer support in a timely manner.

          Tracking Your Package

          Once your order ships, you’ll receive a notification email with the tracking number. You can also check your order status by logging into your BETAFPV account dashboard, where shipped orders display tracking links based on your selected shipping method. If your order status shows “Shipped” but no tracking details are visible, this means your package is prepared and awaiting carrier pickup. A status of “Processing” indicates we’ve received your order and are preparing it for shipment.

          Please note that you may receive more than one Shipment Notification E-mail if item(s) from your order are shipping separately.

          You can also enter the tracking number to check your package shipment status below. If you encounter issues tracking your order, contact BETAFPV customer support for assistance.

          FAQ

          1. How long until my order ships?

          All orders typically will be processed within 1-2 working days after your payment. Delays may occur during high order volumes or backorder situations.

          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 active and remember to check the email for updates.

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

          Country selections cannot be modified after checkout. If you need to change these details, please cancel the order and purchase again. Please contact BETAFPV customer support within 24 hours after placing the order if you need to change order product information or address.

          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 and 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.

          4. Under what circumstances will BETAFPV cancel an order unilaterally?

          We reserve the right to cancel orders for:

          • Unavailable product(s): BETAFPV tries to contact customers and does not get a reply in 7 days.
          • High-risk Order(s) identified by banks/Paypal: To ensure your card safety, we will cancel your order.
          • Unshippable destinations: If we are not able to ship to your location, your order will be canceled.

          *BETAFPV reserves the right to update this policy. Last revised May 2025.

          Customer Reviews

          Based on 2 reviews
          100%
          (2)
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          A
          Alfred Florian
          Alles OK

          Alles OK

          M
          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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