I've just tried out my PA but results are disappointing so far, only just over 20 watts (28V, 3.5A) with about 3 watts drive from a MHL21336 chip. This is being driven by a Lime Mini DATV signal which feeds into a SPF5189Z. Originally I had a 6dB attenuator between the SPF5189Z and the MHL21336 but I have now reduced this to about 3.7dB.
I have made the modifications to the PA board as described in the notes from Heiner and used 5mm copper tape as mentioned in previous posts. This seems to work well and is easy to do.
The PA board is identical to the ones shown in the notes but came from another supplier on eBay. I also have two of the ones from Bison which I'm keeping "in reserve" while I learn from playing with the single board.
The notes mention that more output power can be obtained by not using the input and output isolators on the PA board. Does anyone know how much loss these components may have at 2.4GHz?
The input circuit on the board has two components to be removed. One is an isolator (labelled X2) but I do not know what the ceramic component near it is - any suggestions please?
73 Barry, G8AGN