At least I do, Arie. Maybe those with fewer
"local" signals do not. Dunno.
Phil w7ox
On 5/12/14, 9:23 AM, Arie Kleingeld PA3A wrote:
Well,
You defenitely need those filters in the K3.
When signals are strong and the band is busy,
signals coming through the roofing filter (line
S9+20dB) is said to pump the hardware AGC, even
if you have the DSP filtering set to a small BW.
Anyway, you can certainly hear that.
Try it on CW, on 40m in the evening when
there's a contest. You'll love the 400Hz roofing
filter.
73
Arie PA3A
Al Lorona schreef op 11-5-2014 23:03:
What determines the bandwidth you hear at the
loudspeaker? It's not your roofing filter,
despite a continuing notion that it is.
Dave Hachadorian's point in a post a few
weeks ago was that you don't need a 1.8 kHz
filter to get a 1.8 kHz bandwidth. You're free
to set whatever bandwidth you want with any
filter.
Before rigs had DSP we got used to the idea
that your crystal filter sets your bandwidth.
That's not true any more. It sets your
*maximum* bandwidth. You then have the freedom
to narrow and position a bandwidth arbitrarily
using the DSP controls [SHIFT and WIDTH or HI
and LO].
Here's a true-false quiz:
1. I'm a contester, so I need a 1.8 kHz
roofing filter in the K3.
2. I should purchase the 400 Hz filter if I
like to operate CW with bandwidths of 300 - 400
Hz.
3. For SSB, the 2.7 and 2.8 kHz filters are
'too wide'.
4. I have the 2.7 kHz filter installed, so
for best results I should set my WIDTH control
for a passband of 2.7 kHz.
5. I can use my 2.7 kHz filter in CW mode
with my LO=0.30 and HI=0.50 (that is, BW=0.20).
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