OK I had to check this out on "My" K3. Good band to do this -
20m 6:00pm local time:
SSB-mode, F2 (2.8-KHz), DSP bw=2.8-KHz, PRE=OFF, ANT=triband yagi,
S-meter = S5 Plenty of white noise
CW-mode, F2, DSP bw=2.8-KHz, PRE=OFF, same ANT, same S-meter reading
and same audio noise level
CW-mode, F4 (400-Hz), DSP bw=0.40 KHz, PRE=OFF, same ANT, S-meter =
S2 and lowered noise audio
If I adjust DSP bw=2.8 KHz S-meter increases to S5 and noise audio
equals that I hear with SSB-mode.
AGC=ON for all measurements
So much for "CW is quieter". No narrower bw is quieter regardless of mode.
BTW F1 (13-KHz) is identical to F2 if DSP is set to 2.8-KHz (as you
would expect since DSP sets the receive bw and not the filter).
I have F1 enabled for SSB, AM, FM
F2 SSB, AM, CW
F3 no fllter
F4 SSB, CW
F5 no filter
In any mode if I select F3 or F5 the K3 is VERY quiet, S-meter shows
S0 (would you expect anything otherwise?)
I actually select F3 when operating DATA-A USB because I take the 1st
IF from the K3 to ext SDR and do not use the 2nd IF (K3 DSP).
Visit my LINRAD webpage for more on that.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag Business e-mail:
[email protected]
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