Thank you, took quite some time to research all that stuff
It was a fairly new system, it could run 4G, but then you had to combine all the amplifiers, so it was thrown out for a upgrade.
I did also have 4 power supplies, but I sold those to radio amateurs, they were all in good working condition.
Do you happen to know anything about the design of the power amplifier itself? A user on youtube suggested it is a Doherty amplifier, but I think its a little more complex than that.
The NXP BLD6G22L is integrated doherty amplifier. But as two of these are used, is this really a doherty amplifier inside a doherty amplifier?
It is clear that there are identical mirrored tracks for each transistor, for its carrier and peak amplifier input, but there is a difference from the upper transistor to the lower transistor. The combined output also clearly shows the quarter wave transmission line to phase match the outputs again. So if they are just used as carrier in the upper and peak in the lower, or each of them is carrier and peak amplifier.
My best guess is that the upper is the carrier, due to the differences in the bias circuitry connected to the transistors.?