After using #1037 this past week end, last night I started putting
together #1196 which came right after I got back from TO5E and I was
getting ready for the IARU contest so there just was no time. The
second one certainly is easier than the first. Things went well and I
did add the General Coverage option.
This brings up some questions about the General Coverage option? I
confess to not knowing much about AM. The latest I read is if you are
in AM mode with a 2.8khz 5 pole filter in FL1 if I hold down the knob
for normal I would get 2.8 khz but instead I get 6.0 khz???? I can
expand it to 10 khz. I am "hazy" in my thinking on the effect the 2.8
roofing filter is having here. I can hear "no" difference to my ear
between 6.0 and 10 khz so I assume the roofing filter is having its
effect. However at 5.0 khz with the DSP I can definitely hear less
fidelity and at 4.0 khz it does not sound very good. I suspect that the
signal is strong enough so it is working beyond the width of the roofing
filter.
In SSB the norm takes me to 2.7 khz and I can use the DSP out to 4.0 khz
but I can hear no difference in fidelity. It sounds the best at 2.7 khz
and of course less fidelity as I narrow it down. This I guess is because
I am just listening to one side of the AM signal.
Has there been some changes in the firmware that I don't see anything
written up on. I will have to say that on Short Wave and also AM
broadcast it sounds very good in AM at 6.0 khz with the DSP.
Ed W0SD
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