The selection of IIR versus FIR filtering for the narrowest bandwidths
(50 Hz and 100 Hz) may also have some effect on this.
In general, the K3 and K3S switch to a different filtering algorithm for
these two bandwidths. The loading of coefficients and filter settling
time -- and to some extent the difference in "energy" that may be stored
in these filters from the last time they were selected and this time --
may combine to produce a small artifact during filter selection.
I'll state again that using the Rx EQ to provide additional filtering
doesn't work. The K3 creates a single filter that combines the
bandwidth, center frequency, manual notch *and* RxEQ parameters. And in
general it is a good idea to use rx EQ to tailor the audio response
using cuts away from, rather than boosts of, preferred pitches,
especially near pitches you are likely to want to monitor in CW
operation. The intended purpose of the Rx EQ is to help tailor the
radio to your speakers or headphones, not to provide selectivity or
signal enhancement.
73,
Lyle KK7P
Thanks for the detailed explanation. I was beginning to wonder when
and if someone would advance a valid explanation.
There will be a slight pop when changing bandwidth between 150 and 100
Hz as the K3/K3S disables the RXEQ at bandwidths less than 150 Hz. The
level of the "pop" will be related to the amount of EQ in use *around*
*the center of the passband* (e.g., "pitch")...
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
