Re K3 filters

[mikerodgerske5gbc]

Ed wrote


"Lying to your K3" may be cute to say, but it detracts from what is really
going on.  That filter parameter simply sets the DSP bandwidth at which the
crystal filter engages, and for all narrower bandwidths until the next
crystal filter engages.  The crystal filter and the DSP filter can have
three basic relationships, all with different results.  One filter can be
significantly wider than the other or they can be close to the same
bandwidth.  There are lots of K3s configured in each of these three ways and
the users that understand the implications of their particular choice will
have one or more reasons for that choice.  One popular reason for engaging
the crystal filter at a significantly wider DSP bandwidth, is that the shape
of the audio passband is "rounder" (because it is dominated by the crystal
filter passband shape) and sounds a bit different than when the more
rectangular DSP passband dominates, i.e, is narrower than the crystal
filter.  One popular reason for engaging the crystal filter when the DSP
bandwidth is well inside it, is to maintain consistent bandwidth steps as
the K3 IF bandwidth is varied via the WIDTH or HI/LO-CUT controls.  Users
that care about this usually don't confuse the marketing name of the filter,
e.g., 250 Hz, with the actual bandwidth, e.g., 370 Hz.

Ed - W0YK


Ed, I went back and looked at some filter and dsp plots and see that this indeed causes a "softer" filter scenario. Too bad you cant switch on the fly!

I may play around with that. I normally use the 2.7 filter. No 2.1. Engage 1.8 at 1.8.

I think if I need the filter I would want it sharp as qrm is the reason I'm narrowing the bandwidth. I don't contest and maybe a soft 2.1 is more desirable when "running" a frequency?

I'll have to experiment with how it sounds different. Is it more pleasing to the ear?

Thanks and 73
Mike R

Play me some fiddle, but no stinkin' violin!

Amateur/Ham Radio KE5GBC
HF & Echolink mobile
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[Thomas Horsten]

Mike,

You could actually do that with macros. Too bad there are only 2
programmable buttons on the K3, and in my case they are already spoken for
- but if you have a computer connected it could be done relatively easily.

73, Thomas M0TRN

On 30 March 2012 09:19, Mike Rodgers <[hidden email]> wrote:

> Ed, I went back and looked at some filter and dsp plots and see that this
> indeed causes a "softer" filter scenario. Too bad you cant switch on the
> fly!
>
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[Dick Dievendorff]

Macros can be invoked with PF1, PF2 and also M1 thru M4 tap or hold.

See K3 Utility Help,  Command Tester/K3 Macros, Macro assignment procedure
overview.  M1-M4 tap or hold can be used for CW/Data/Voice memories or
command macros.

73 de Dick, K6KR


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Thomas Horsten
Sent: Friday, March 30, 2012 5:45 AM
To: Mike Rodgers
Cc: [hidden email]
Subject: Re: [Elecraft] Re K3 filters

Mike,

You could actually do that with macros. Too bad there are only 2
programmable buttons on the K3, and in my case they are already spoken for
- but if you have a computer connected it could be done relatively easily.

73, Thomas M0TRN

On 30 March 2012 09:19, Mike Rodgers <[hidden email]> wrote:

> Ed, I went back and looked at some filter and dsp plots and see that
> this indeed causes a "softer" filter scenario. Too bad you cant switch
> on the fly!
>
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