Procedure: Setting the DSP filters for SSB

[ac2ev]

One thing on my K3 that's made me wonder if I'm doing it right is how to adjust the various filters and settings to accomplish two things.

1. During contests, how to best adjust to hear the station and not the guy 2.5KHz away

2. When trying to hear the weak DX, not be blasted by that guy from Florida or Texas running a kilowatt.

I work SSB only at this point and haven't found any videos that show how to best adjust things.

Don Kiser - AC2EV
RARA Board member
VE Team Leader
585-613-1035
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[N1EU]

For ssb, you're only real hope is to adjust that interfering guy's
transmitter.

73, Barry N1EU

On Wed, Apr 27, 2016 at 9:38 PM, <[hidden email]> wrote:

> One thing on my K3 that's made me wonder if I'm doing it right is how to
> adjust the various filters and settings to accomplish two things.
>
> 1. During contests, how to best adjust to hear the station and not the guy
> 2.5KHz away
>
> 2. When trying to hear the weak DX, not be blasted by that guy from
> Florida or Texas running a kilowatt.
>
> I work SSB only at this point and haven't found any videos that show how
> to best adjust things.
>
> Don Kiser - AC2EV
> RARA Board member
> VE Team Leader
> 585-613-1035
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[Don Wilhelm]

Don,

Actually the answer to #1 is not difficult at all - use Hi Cut and Lo
Cut when operating SSB.  The Width and Shift are best left for CW and
digital modes.  Hi Cut and Lo Cut automatically change the center
frequency.  Attempting to use Shift and Width in SSB can be a matter of
frustration because when the width is changed, you must adjust shift to
maintain intelligibility.

If the station interfering is on the high frequency side, you are in
luck, you can use an extreme amount of Hi Cut to kill the interference
and continue with your QSO.  The desired signal may lose a lot of its
natural sound, but will still be intelligible.

If the offending signal is on the low frequency side, your luck may be
more limited.  You cannot cut a lot of the low frequency side of the
human voice and still maintain intelligibility.  If you get the Lo Cut
much above 500Hz intelligibility will have a severe impact.

That is just the "way it is", the human voice needs frequencies in the
500 to 1500Hz range for intelligibility, and there is not much that can
be done about that fact.

For #2, if the strong station is taking over the AGC in your K3, the
only cure is to add more narrow roofing filters.

I don't have any video references (and I don't find them to be of
value), but try the techniques I have outlined above on your own station
- you will hear the difference.
Even when there is no interference, see how much Hi Cut you can use
while still maintaining intelligibility, then see how far you can cut
the low side and still maintain intelligibility.  That will give you an
understanding of how much you can cut.

73,
Don W3FPR

On 4/27/2016 5:38 PM, [hidden email] wrote:
> One thing on my K3 that's made me wonder if I'm doing it right is how to adjust the various filters and settings to accomplish two things.
>
> 1. During contests, how to best adjust to hear the station and not the guy 2.5KHz away
>
> 2. When trying to hear the weak DX, not be blasted by that guy from Florida or Texas running a kilowatt.
>
>

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[Bill Frantz]

Well, these are always problems.

1) To avoid the guy 2.5KHz away, cut the high frequency cut off
down low. I frequently operate it at 2.05 or 2.15 KHz. I keep
the low frequency cutoff much more constant at .25 to .36 KHz.
This procedure will keep most of the interfering signal out of
the audio.

2) That weak DX is always a problem. If he is running split and
you have a subreceiver, then adjust the two receiver AF volume
control differently. If the loud signal is on the same
frequency, you can try to adjust the AGC parameters to "even
out" the audio. The AGC SLP parameter is the one to look at
first, but a warning. It is an advanced control, and requires
TECH MD ON to adjust. Many on the list think the K3 comes set
too flat already. But you can always return the settings to the
default listed in the manual if you don't like your results.

73 Bill AE6JV

On 4/27/16 at 2:38 PM, [hidden email] wrote:

>1. During contests, how to best adjust to hear the station and not the guy 2.5KHz away
>
>2. When trying to hear the weak DX, not be blasted by that guy
>from Florida or Texas running a kilowatt.
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[ac2ev]

Thanks to all for the responses. I've been doing wrong the whole. I have not been using hi and low cut which explains my frustration.


>
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[Kjeld Holm]

Hi Don,
The people talking about High cut and low cut are correct. But in a contest
it may be easier just to select Filter width 1500 and Filter shift 750.
Vy 73 de OZ1CCM, Kjeld

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of
[hidden email]
Sent: 27. april 2016 23:39
To: [hidden email]
Subject: [Elecraft] Procedure: Setting the DSP filters for SSB

One thing on my K3 that's made me wonder if I'm doing it right is how to
adjust the various filters and settings to accomplish two things.

1. During contests, how to best adjust to hear the station and not the guy
2.5KHz away

2. When trying to hear the weak DX, not be blasted by that guy from Florida
or Texas running a kilowatt.

I work SSB only at this point and haven't found any videos that show how to
best adjust things.

Don Kiser - AC2EV
RARA Board member
VE Team Leader
585-613-1035
______________________________________________________________
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delivered to [hidden email]

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