[TenTec] Orion Roofing Filter Cut In

[K4IA at aol.com]

I am confused by the scheme used to automatically cut in the Orion roofing 
filters.

Why does the filter not cut in until the DSP bandwidth is substantially less 
than the filter?

For example, the 2.4 filter doesn't switch in until the DSP is at 1.990.

The 1.8 doesn't engage until the DSP is at 1.400  This is way too narrow for 
SSB - thus there is no effective roofing filter for narrow SSB and one could 
argue this roofing filter is useless for SSB.  Yes, I know you can set the 
passband for +150 and still be able to decipher SSB at that narrow a DSP setting, 
but speech is very difficult to understand.

The 1.0 comes in at .740  Is this one of the reasons some have switched out 
the 1.0 in favor of the INRAD 600 in this position?

The 500 is at 350.  I don't have the 250 so I can't comment on that one.

Wouldn't it make more sense to have the roofing filter match the DSP?

Would it make sense to have the roofing filter kick in "early" as the INRAD 
600 does when placed in the 1.0 position?

Radio k4ia
"Buck"
Fredericksburg, Virginia USA