During Kenwood transceiver bench alignments, they specify 100dBuVEMF as the S9+20 outer marker. This equates to -1dBm. As an anecdote, during a contest with multi-transmitters, we saw around 3Volts of RF at one receiver (tuned to a different band of course), and it survived quite happily. Best I can make out, the NanoVNA only outputs like -10dBm.. ??
