[TenTec] Roof filters (N4PY and KC9CDT)

[Grant Youngman]

> > I'm convinced there's a bug in the code for the Sub RX 
> somewhere. 

> I'm pretty sure this has been corrected in the latest Orion I 
> v2 firmware.

Barry ...

It has not been fixed in 2.032, presuming we're talking about the same
problem, which we may not be.
 
> Generally speaking, you should adjust your RX EQ and SUB EQ 
> for similar
> response to your liking.  

What I'm refering to isn't an EQ issue, it's a passband position issue.  In
SSB mode, when the passband is narrowed, it also shifts up away from the low
end significantly.  So much so, that large PBT shifts are required to
restore the low end.  I'm hoping to have a SA to put on the radio later
today, and try to see what's going on.

For example, put main/sub on the same QSO and set each for 1500 Hz
bandwidth, PBT = O.  I know that's extreme, but it will demonstrate the
point. Then see how far you have to tweak PBT on the Sub to get something
that sounds like the Main.  I just did that, and it takes about -600 Hz on
the Sub (give or take your ears). 

Grant/NQ5T