>True enough these are not 25 hz and 10 hz filters.
They are 60hz filters.
This makes sense Lee. 60 Hz BW is
reasonable since clean CW at ~13 WPM should
occupy close to ~30 Hz BW; twice that BW would
allow faster speeds. The broad shape factor
also helps (3:1 is identical to Orion's
>I have no problem receiving any CW signal using
these filters. And there is no ringing.
CW at normal speeds should not occupy
anywhere near 200 Hz unless it has bad
phase noise or clicks, which you don't want
to receive anyway. Good CW should fit nicely
into a 60 Hz filter with a 3:1 shape factor.
Maybe the laws of physics haven't been
repealed after all! ;-)
I do wonder why they added the
10 Hz filter since its performance is
only 4 Hz less than the 25 Hz filter.
I also noticed that 25 Hz is the lowest
BW listed on Flex's website, so perhaps
the 10 Hz is still a work-in-progress.
>So far I'm pretty impressed.
Indeed it's impressive judging
from ARRL's review, but the price is a bit
deceptive if you don't already own a high
performance PC and the Delta-44 sound card.
Keep us posted on how you like it.
73, Bill W4ZV
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