A few weeks ago I was chatting to a Lime mini SDR owner who expressed some concern over out of band spurious products and the inability to generate enough power to drive a EP-AB003 Wifi amplifier.
My WiFi amplifier requires 175mW of drive while a recently completed DJ0ABR amplifier needs just under 200mW for 5 Watts output. There are ebay modules that are good to 100mW but driving these harder just leads to poor quality uplink signals to QO-100.
So another project was born.
Pictured below is a 45 x 43mm prototype PCB that has 2 stages of amplification together with a 2.4GHz bandpass filter on the input. The PA device is the Qorvo TQP7M9101 which is a 5V 250mW linear amplifier.
The board is mounted on a small heatsink. This is not really needed for heat dissipation, more to provide a support for the 0.8mm PCB. I anticipate 200mW out with good linearity. Now to populate the PCB, see how well it works and correct any board errors.
73 David G0MRF