[Elecraft] Re: K3 in SS Phone

[David Ferrington, M0XDF]

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" <n6kr at elecraft.com> 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)