[NLRS] 24 ghz EN04RB 2nd Attempt

[jcplatt1@mmm.com]

Hi Mike, sounds like you guys are having fun on 24 GHz.    Two observations
from the cheap seats.

1.   Regarding humidity level and absorption at 24 GHz, for a given parcel
of air I think relative humidity (RH) will drop as temperature increases,
yet the amount of water vapor in the air remains constant and it the amount
of water vapor that is important.   So when you use RH you also have to
indicate temperature.   In other words just because the RH drops doesn't
necessarily mean that absorption has dropped.   I think dew point is a
better indicator because it stays fixed (for a given water vapor level).
I may have this wrong, but if so, I have no doubt that others on this
reflector will set me straight !

2.  Assuming a flat earth (ie; Iowa), if that house is 1/2 mile away and is
30' above you, I think that the angle is 0.65 degrees (arc tan of 30/2640
?).   I would guess that this is indeed eating a bit into your horizon as I
think the rule of thumb is for about -10 dB for every degree of elevation
off the horizon.    Ask the neighbor to move (or perhaps open their windows
on both sides of the house to let a little RF through).

73, Jon
W0ZQ