SO-50 has a very, very sensitive uplink. I've gotten into it with 50 mW to a whip antenna. Be sure to always use a 67.0 Hz tone.
The 250 mW downlink can be weak and you need high quality coax. For a home station, you almost certainly need a preamp unless you have a very short run of very good coax.
73,
Paul, N8HM
I have always had a miserable time working this bird. For weeks I've been hearing others but no one hears me. The pass just completed took it overhead at more than 50 deg at my QTH. I heard absolutely nothing until the bird was well past TCA and south of me. Suddenly there was KB3IAI and KN4ZAA. Worked both but no one else. Reception was much better on vertical than horizontal. Lots of QRN, however.
Ray
KN2K
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