On Wed, 20 Nov 2013 13:54:46 -0500, John Nelson (KD8TZC) wrote:

> Okay, so let me rephrase?K if I use a 500 Hz filter, I won??t hear it unless I
> am within 500 Hz of the signal.

Theoretically. Truth is, it depends on how good the filter is. If a
guy is 40 over 9 just a few KC up/dn the band from the edge of your
filter, you'll likely know it. Every filter has a "quality" number,
both in ultimate rejection, and in shape factor (how steep the skirts
are). But, given normal signals, you should not hear anything outside
the filter edges. BTW, a 500Hz filter does not mean it will pass plus
and minus 500Hz. It means it will pass 250Hz each side of the center of
the 500Hz.

Gary
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On 19/11/2013, John B <jab3739@...> wrote:

Hello to the group,
I have not taken time to see if one exist but thought I would ask the group
and shorten my research time to find such a book if it exist. I do not
spend a lot time on the air, I use the hobby to experiment with kits and
test equipment and am not an expert at that either. so if anyone knows of a
good way to learn about the features of the icom 7000 via a book or you-tube
let me know.
john kg9dk



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On Wed, 20 Nov 2013 11:38:35 -0500, John Nelson wrote:

> Thanks? so if a cw tone were to appear within that filter, then it would
> sound normal, and outside it would sound all garbled. That makes sense.

Not quite. It shouldn't sound garbled, you just won't hear it, unless
there it filter leakage. It shouldn't be garbled unless you are using
NR. Another can of worms. :o)

Gary
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On 11/20/13, 11:33 AM, "KE1B" <ke1b@...> wrote:

On Nov 20, 2013, at 5:28 AM, ic7000@... wrote:

Tue Nov 19, 2013 11:10 am (PST) . Posted by:"John Nelson"
johnvn_1969Okay, it appears that filter 2 is selected (500 Hz) as noted
below? What do
most people run this as?

John V. Nelson ? KD8TZC

For everyday operation, I generally run 400 Hz. It provides good
selectivity without sounding too harsh. In contests, or when operating a
DXpedition with my 7000, I will often narrow it down to 200 Hz or so, to
be able to pull out a single signal from the pileup. On other radios
(e.g., my IC-7600) I will also engage the Audio Passband Filters (a
second set of filters in the audio chain, beyond the regular filters in
the IF) to really clean things up.

If you are operating totally "in the clear," i.e., no nearby signals and
good signal strength, you can open the filter up to 1 KHz or so and it
will have a more "natural" sound, to most people's ears.

Rich KE1B



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On Nov 18, 2013, at 9:01 PM, "Alex Netherton" <anetherton@...> wrote:

?

Your CW filter is probably set for 500 hz, and it sounds like that when the bandwidth changes. You want to hear something really funny and muffled, engage the DSP; I cannot stand it, so listen to more noise. Just used to older radios. If you can get used to DSP, much of the noise will be eliminated, occasionally to the detriment of weak signals. Unless you have a KW and a beam, weak signals are hardly worth the bother.

KC4BO

Alex Netherton

On Mon, Nov 18, 2013 at 7:57 PM, John V. Nelson (KD8TZC) <kd8tzc@...> wrote:

?

When I turn my 7k to the CW mode, for some reason all the background noise sounds really muffled.? If I then switch it to LSB or USB, I can hear the CW tones that are being sent by other stations.? Why do I have set wrong on my unit and how do I fix it so I can use this correctly.

?

Thanks,

?

John – KD8TZC

On Nov 18, 2013, at 9:01 PM, "Alex Netherton" <anetherton@...> wrote:

?

Your CW filter is probably set for 500 hz, and it sounds like that when the bandwidth changes. You want to hear something really funny and muffled, engage the DSP; I cannot stand it, so listen to more noise. Just used to older radios. If you can get used to DSP, much of the noise will be eliminated, occasionally to the detriment of weak signals. Unless you have a KW and a beam, weak signals are hardly worth the bother.

KC4BO

Alex Netherton

On Mon, Nov 18, 2013 at 7:57 PM, John V. Nelson (KD8TZC) <kd8tzc@...> wrote:

?

When I turn my 7k to the CW mode, for some reason all the background noise sounds really muffled.? If I then switch it to LSB or USB, I can hear the CW tones that are being sent by other stations.? Why do I have set wrong on my unit and how do I fix it so I can use this correctly.

?

Thanks,

?

John – KD8TZC