[amsat-bb] Help with Mirage KP-2 mast mounted preamp

W3AB/GEO w3ab at yahoo.com
Wed Oct 25 17:29:02 UTC 2017

IMHO, I would review the data sheets for the FETS you have, take some voltage measurements in the inop boxes then see if they might work in the circuit.

Thete is more to it than that, noise figure, gain, etc but it is a start.

Sent from my two way wrist watch
73 de W3AB/GEO​

On Oct 25, 2017, 07:45, at 07:45, Eduardo PY2RN <py2rn at arrl.net> wrote:
>I need to replace the FETs for both: KP-2/2m and KP-2/70cm, I look for
>schematics and parts list for these units for some years already and
>wasn't able to find anywhere on the Internet. The "mysterious" FET
>seems to be the same for KP-2/2m and KP-2/70cm on the circuit (KP-2
>rev. B) and it feeds another FET: J310 for 144Mhz and a J309 for
>435MHz. I have couple spares of MFG1302 and 3SK74, not sure if it would
>make a good direct replacement ?
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