[Elecraft] K3S DSP filter plots

[Jeff AC0C]

It's easy to measure this.  Here's one way to do it - assuming you already 
have a functioning  AFSK/PSK interface working with a rig/PC.

Download and install the WD6CNF Audio Spectrum Analzyer.  Set it up to 
listen to your rig interface AF feed.

On the rig, turn of the AGC and the rig's preamps.  Turn of NR, DNR - 
whatever the noise reduction and noise blanking stuff is called.

Set the mode to SSB or CW (I forget if there are min DSP BW restrictions in 
SSB).  Set the roof selection manually to something wide relative to the DSP 
(so you don't comingle the two transition bands).  The 2.7 Khz filter

Feed a stable S8 (-80 dBm) into the antenna and tune it so you have roughly 
a 700 hz signal.


73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: George Fritkin via Elecraft
Sent: Monday, November 16, 2015 7:49 PM
To: k6dgw at foothill.net
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S DSP filter plots

And I will add a filter is not a filter.  No, I am not crazy.  There are 
many types of filters with various trade-offs.   In band 
ripple.....loss......phase shift.......skirt shape....are just some of the 
trade offs.  DSP software can emulate any or combos

George, W6GF


Sent from my iPad

> On Nov 16, 2015, at 5:03 PM, Fred Jensen <k6dgw at foothill.net> wrote:
>
> No doubt Wayne is qualified, however he has deferred on several occasions 
> to Lyle who I believe actually writes the code.
>
> And a teeny point from a math major ... inasmuch as arithmetic is a part 
> of math, it is clearly "done mathematically."  The "real" math however is 
> in figuring out what arithmetic to do.  At the implementation level, it's 
> all arithmetic, generally in base-2.
>
> I'll bet my next paycheck, if I got one anymore, that both Lyle and Wayne 
> understand both.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the Cal QSO Party 1-2 Oct 2016
> - www.cqp.org
>
>> On 11/16/2015 4:18 PM, Bob McGraw - K4TAX wrote:
>>
>> Perhaps Wayne is better qualified to define the performance of the DSP
>> filter system, usually limited by the number of poles and is done
>> mathematically.
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