That looks like a very good plan - Wayne, you've just done yourself out of a 2.1kHz sale! I'll wait for the variables. Now should I swap my 400 for a 200?
On 19/11/07 21:24, "wayne burdick" <[EMAIL PROTECTED]> sent: > One of the variable-passband filters we've been considering is one for > SSB, with a range of about 1.4 to 2.2 kHz. It would have 5 poles rather > than 8, but I'm sure it would work well in combination with the I.F. > DSP. The MCU would automatically dial in the crystal filter bandwidth > to match the DSP. > > This would be a slot-saver for those want multiple SSB RX bandwidths. > Once the CW variable-passband filter was also ready, you might have: > > FL1 6.0 kHz > FL2 2.7 or 2.8 kHz > FL3 1.4-2.2 kHz (SSB variable passband crystal filter) > FL4 0.4-0.8 kHz (CW variable passband crystal filter) > FL5 200 Hz > > Variable filters covering a wide range will have slightly greater > ripple than fixed filters when they approach either end of their range, > so we'd only use them in receive mode. In the example above, FL2 would > be used for SSB/CW/DATA transmit and FL1 for AM transmit. Those who > wanted FM and were less concerned about the narrowest possible CW/DATA > bandwidths could shift all of the filters down one slot, bumping out > the 200-Hz filter. > > 73, > Wayne > N6KR -- Mathematics is the language with which God has written the universe. -Galileo Galilei, physicist and astronomer (1564-1642) _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
