31, 2007 14:25 UTC
Subject: Re: [digitalradio] Re: [illinoisdigitalham] Re: Power Mask for
Bandwidth Rules - USA
At one time the ARRL published plans for class B modulators with no
filters. What they publish will stay with the times. There is no reason
higher order analog filters can
Modern filters that have been used in real equipment since the 80s can
be -1 db at 3100 and down 25 db at 3.5 k with negligible overshoot and
ripple in the 10ths of a DB. Chebyshev filters are not really the filter
of choice for this, elliptic tilers with some custom tweaks are a better
To: digitalradio@yahoogroups.com
Sent: Sunday, December 30, 2007 23:16 UTC
Subject: Re: [digitalradio] Re: [illinoisdigitalham] Re: Power Mask for
Bandwidth Rules - USA
Modern filters that have been used in real equipment since the 80s can
be -1 db at 3100 and down 25 db at 3.5 k
