[Elecraft] K4 CW filtering

[Dave New, N8SBE]

Bill,

Usually in CW modes the bandwidth center shifts to the CW pitch (in my 
case, 0.60 kHz, or 600 Hz) and the bandwidth goes to 800 Hz.  Of course, 
you can increase or decrease the bandwidth, but the center is shifted to 
match the sidetone pitch, so if you match the CW signal pitch to your 
sidetone pitch (tap SPOT to hear your sidetone while receiving, or hold 
SPOT one-half second to AUTO spot), you will transmit on his frequency.

I find it convenient to set the filter to BW/SHFT in CW mode, and HI/LO 
in SSB modes (tap the BW/HI soft button on the screen next to the FILTER 
knob to switch between BW/SHFT and HI/LO modes).  If you are familiar 
with the similar controls on the K3/K3s, it will be intuitive.  
Unfortunately, the K4 doesn't retain the FILTER mode from the previous 
other mode setting, like the K3/K3s did.

If you hold the FILTER knob for one-half second, it will reset the 
filter to the default for the current mode - 0.80 kHz BW/0.60 kHz SHFT 
for CW, and 2.90 kHz HI/0.10 kHz LO for SSB mode (if you change the 
display to HI/LO for SSB mode).

Hope that helps. Please join the Elecraft-K4 at groups.io email group for 
further help with your K4.

73,

-- Dave, N8SBE, Hamshack Hotline 590-0971, HamsOverIP 101018, 
AmateurWire 1348

On 2024-11-13 23:29, Bill Overstreet wrote:
> I need some explanation of how filtering is done in the K4 when in the 
> CW mode.
> 
<snip>
> Thanks, Bill, K4AJ