[Elecraft] K3 - Audio/IF filtering definitions

[KD8NNU]

I have multiple macros for setting filter width for digital modes.

I use the HRD suite of software with the DM780.  Basically I center the 
selected signal with one mouse click and then pick the filter I want with 
another mouse click and center point at 1.5 where I centered the RX 
transmission.   I can take PSK signals that are being masked by other other 
signals in a wide waterfall to 599 copy.  So I don’t have to care about 
strong signals drowning out a weak signal I am trying to copy.

This is one of the great strong points of the K3 from my perspective with 
the multiple filter options for different operating conditions.



~73
Don
KD8NNU
-.- -.. ---.. -. -. ..-
-----Original Message----- 
From: Bill Frantz
Sent: Tuesday, November 27, 2012 6:25 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 - Audio/IF filtering definitions

In addition to the SSB examples several people have posted, the
Hi and Lo Cut controls are quite useful in soundcard digital
modes. For example, when I use my computer for PSK, I scan the
band with the bandwidth set to a low of 300 Hz and a high of
2.6KHz. I have a macro to set this bandwith (IS 1450;BW0230;).

When I start a QSO, I narrow the Hi and Lo Cut controls to
eliminate most of the other signals on my waterfall. The audio
frequency marks on the computer's waterfall make this adjustment
straight forward if a bit fiddly. The resulting bandwidth is
between 50Hz and 150Hz and makes use of the 250Hz crystal filter
in the K3. (Someday I have to reprogram the computer to send the
narrow bandwidth details to the K3.) With this narrow bandwidth
I find it easier to pull weak signals out of the noise floor and
avoid overload from nearby strong signals.

Cheers - Bill, AE6JV



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