RM Italy AD-203

The RM Italy AD-203 is an internal linear amplifier board, also known as a “stinger board,”, or “Stinger 100″ designed to be installed inside a compatible mobile transceiver to increase its power output.
Features and Specifications
The AD-203 is a compact PCB board intended for use with low-power radios operating in the 25-30MHz range, commonly the 10-meter amateur radio band or the CB band (where its use on the latter is a violation of US FCC regulations).
Frequency Range: 25-30MHz (AM/FM)
Input Power: Recommended 2.5-3 watts (max 4 watts); Input Power SSB: 1-20 watts
Output Power: 80W PEP max (some retailers list 100-150W PEP depending on installation/radio)
Modes: AM, FM, SSB, CW
Transistors: Uses four RM3 MOSFET transistors
Power Supply: 12-14 VDC supply
Dimensions: 4″ x 4″ x 1”
Installation: Designed to be installed internally, often in place of the transceiver’s speaker. It does not include an on/off switch; one must be added externally if desired.
User and Expert Opinions
Reviews from users and experts indicate that the RM Italy AD-203 is a popular, cost-effective solution for boosting the signal of low-power mobile radios.
Performance: Users report a significant power boost, often achieving 60-100 watts output on AM and more on SSB with a proper low-wattage input signal (around 1.5 to 2 watts dead key works best to prevent overheating).
Ease of Installation: Many users find it easy to install by following the provided diagrams and instructions, making it a popular modification for radios.
Durability: The board is considered durable and reliable as long as it is not overdriven with too much input power. Overdriving can cause heat issues and damage the transistors.