[Elecraft] RTTY FILter

[Jack Smith]

Looks like the FSK/DATA mode filter may be ringing - eyeballing the 
filter envelope looks like it has some dips.  A bit more bandwidth might 
help - and the other time I've seen this is when there's a tuning error, 
such that the two bandpass filters are not exactly centered on the 
mark/space frequencies. That observation is not with respect to the K3, 
but relates to observations I made back in the days of Model 15 page 
printers with analog filter demodulators.


Jack K8ZOA

On 9/3/2011 11:23 AM, wa9fvp wrote:
> Here's are the actual Butterfly filter outputs using an Agilent DSOX3024
> digital storage scope connected to the mark/space (or X/Y) outputs on the
> M8000.   The first image is the actual DSOX3024 screen shot  with the K3 in
> USB mode on 20 meters, copying RTTY 45/170.   The second photo is the same
> setup except the K3 is in FSK/DATA mode.
>
> http://elecraft.365791.n2.nabble.com/file/n6756776/rtty_usb_mode.bmp
> http://elecraft.365791.n2.nabble.com/file/n6756776/rtty_data_mode1.bmp
>
>
> -----
> Jack WA9FVP
> Willco Electronics
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