Posts by OH3WE
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Maybe you can post some photos?
vy73 DB8TF
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Hi,
I'm using a TeliaSonera cellular amp which I stripped from an old base station system. It utilizes a couple of Ampleon BLF8G22LS-160BV with very poor efficiency. It is almost impossible to de-solder anything because the PCB is very thin and the 6 mm thick baseplate absorbs heat too well. Replacing the output SMP (P like Pee) to SMA was unsuccesful. I Just damaged the pcb.
Now I'm taking power out from the circulator directly with a teflon coax.
The pair of fets have very different biases. The other one warms up and draws a lot of current, about 50 watts of idle power warms up the shack.
Nevertheless the system delivers 70 watts output (perhaps more).