The EB-AB003 2.4GHz linear amplifier seems to come in two versions. A later one sold by Passion Radio has the external model number EB-AB003 but the internal marking HS2405X2 V.0.1.

The mod for the “classic” EB-AB003 is not applicable to this model as the internals are totally different.

The mod is for permanent TX (as this is just a dumb linear amplifier).

I found some photos on QRZ.com outlining the mod. I have not yet done the mod, but I wanted to get it captured for future reference.

It appears to consist of:

• Connecting the RF input to a different point on the board
• Possibly cutting tracks
• Bridging together pins 4 and 5 of the ADA4851-4 chip.

Note that the RF out port is a reverse polarity SMA socket!!

The F1OPA 2.4GHz 100mW amplifier is ideal for driving this power amplifier.