If you're an A&P working on your experimental, the install is legal. If not, you'll need an A&P to sign it off. Reading 14 CFR 91.413 and Part 43 Appendix F you should have it tested if 91.225 applies, or will apply, to your operations. Although you've accomplished a successful Public ADS-B Performance Report, those results don't satisfy 91.413.
To your question for the logbook entry, Part 43.9 has the info. An entry/sticker for the Transponder check from your avionics guru under that should seal the deal.
Heat
_________________ Paul "Heat" Baxter N8JB
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