Wednesday, 17 December 2014

PGA144 follow-up

My initial measurements now show
NF 0.6dB (usual caveats apply)
Gain 2.5 to 20.5dB ( adjustable)
Input third order intercept >+8dBm!
Input return loss ~9.5dB
Notch at 98MHz, -43dB wrt 145MHz at full gain
Unconditionally stable

All subject to further tests, of course.

Also
+8 to +16v working.
110mA current consumption
Can be optionally powered over the coax

Mechanically mounted in a screened tinplate box.
Connectors-  SMA female.

The PCB can be used without the box, if you want to mount the preamp inside another rig. Provision is made for two separate types of SMA connector on input and output to facilitate this. You could even use miniature coax cable direct to the input trace.

Enough............

Sam

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