On Sunday, March 11, 2018 at 8:44:54 AM UTC-7, Dan Marotta wrote:
Why not use 0=aggressive?

I occasionally see PCAS targets at 0 altitude differential right on top
of me.Â* I assume that's my own ship, but it's very disconcerting to have
that pop up.Â* I'll have to check my config file...

On 3/10/2018 7:46 PM, Dan Daly wrote:
# own Mode C signal filtering (to eliminate your own xpdr)
# 0=aggressive (use w/ Mode C Xpdr), 1=normal (no Xpdr or Mode S)
# normal sometimes results in false PCAS alerts about every 10 min
$PFLAC,S,OWNMODEC,1

--
Dan, 5J

Probably because if you have Mode S the Flarm can tell it's you, but if you have mode C all it can tell is there is some traffic nearby - perhaps you, or perhaps someone else.