[Lowfer] WSPR-15 tonite

[Eric NO3M]

Another observation that Pat had made regarding similar 
performance between R75 and K3 -- this may be due to the fact the 
signals are all within the passband and receiver performance 
starts to diverge.  The specs published by Sherwood are *optimal* 
IP3 measurements, meaning they are derived with practical narrow 
filtering in use.  The K3 has three different values, depending 
on the roofing filter engaged and vary up to 6 dB, but using at 
least 500Hz roofing.  IDK what roofing filter is used or 
available on the R75s that the IP3 was derived from.

73 - Eric NO3M, WG2XJM