K4IA:
>I am confused by the scheme used to automatically cut in the Orion roofing
filters.
I believe Ten-Tec uses an algorithm to switch their roofing filters
at ~75% of nominal bandwidth. Remember that the purpose of the roofing
filter is to block unwanted products at the front end and not necessarily
be the same as DSP bandwidth. In the case of the 1800 Hz filter, I agree
that using Auto makes no sense at all, at least on SSB. However, this is
why you have the option of manually selecting any filter. Just like for
cars, some like Automatic transmissions but those who want to optimize
performance choose Manual transmissions. Orion gives you the choice of
either. The important thing is to understand exactly what Orion is doing
so you know when to use Manual and when to use Auto. BTW, the 250 switches
in at 190 Hz.
73, Bill W4ZV
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