SSB Contesting filtering out contesters

[David Smith]

Have a question I feel I know the answer to.  I am an avid contester and
when contesting thru the years (since 1978 and especially on 40 meters) have
always had problems filtering out on my receive other contest stations who
bleed over to my receive frequency their signals so I care hear the weaker
stations coming back to me, mainly domestic contests.  Thru the years
operated IC 765, Omni 6+ and now the K3S.  Still with DSP filtering, etc. I
feel this is a way of life with contesting.  Have had this discussion with
many of my big gun contesters and we feel this must be a way of life with
ssb contests.  CW contests are much easier to filter out the side to side
stations.  My directional antennas on these bands help a lot but guess this
is the way of life with ssb contesting.  Would like other input from your
experiences.

 

Thanks

 

David, ND4Y  (KS3, KS2, KX2 owner)



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[Nate Bargmann]

It is a way of life.  That said, I have found that for stations below my
frequency on LSB or above it on USB that I can advanced the Hi Cut
control quite a ways while maintaining intelligibility of the received
signal.  The converse, stations above on LSB or below on USB cause me
more problems as intelligibility deteriorates rapidly as the Lo Cut
control is advanced.  This is with a K3 with a 2.1 kHz filter installed.

Still, the K3 is the absolute best in this regard of a number of radios
I've used over the years.  This is just due to the characteristics of
SSB and the way we use it in amateur radio.

73, Nate, N0NB

--

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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[Jim Brown-10]

On Fri,9/2/2016 10:50 AM, David Smith wrote:
> have
> always had problems filtering out on my receive other contest stations who
> bleed over to my receive frequency their signals so I care hear the weaker
> stations coming back to me, mainly domestic contests.

Nothing new here -- NO receiver can "filter out" interference that is
inside its passband. If a station is transmitting trash (splatter) ON
YOUR FREQUENCY, there is NO solution other than him fixing his dirty
station. This splatter (and key clicks) can be VERY clearly seen on a
properly adjusted P3 as horizontal lines in the waterfall from a dirty
signal on audio peaks.

73, Jim K9YC

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[EUGENE GABRY]

David,
Jim is spot on about wide dirty signals getting into your passband. The best you can do is play with the band width and shift to find a combination that limits the interference and makes the signal you are trying to copy, more copyable. For SSB contesting I will use the 2.1khz filter with a bit of DSP and also some shift to knock down the interfering station. I will say, the K3/S is far superior to the 756ProIII I had prior in this regard, from sharp filtering and AGC pumping. I can usually knock out a strong wide signal well into the passband I am listening, so that I can copy the weaker station.
 
I am amazed though how close these days SSB contesters "overlap" intentionally into someone else's frequency, sharing half of the 2.7khz band width! That's one reason I prefer and enjoy CW and RTTY contests over SSB contests. Much more pleasing on the ears and temper!
 
73, Gene N9TF
K3S 10057

----- Original Message -----

From: "David Smith" <[hidden email]>
To: "elecraft" <[hidden email]>
Sent: Friday, September 2, 2016 12:50:36 PM
Subject: [Elecraft] SSB Contesting filtering out contesters

Have a question I feel I know the answer to.  I am an avid contester and
when contesting thru the years (since 1978 and especially on 40 meters) have
always had problems filtering out on my receive other contest stations who
bleed over to my receive frequency their signals so I care hear the weaker
stations coming back to me, mainly domestic contests.  Thru the years
operated IC 765, Omni 6+ and now the K3S.  Still with DSP filtering, etc. I
feel this is a way of life with contesting.  Have had this discussion with
many of my big gun contesters and we feel this must be a way of life with
ssb contests.  CW contests are much easier to filter out the side to side
stations.  My directional antennas on these bands help a lot but guess this
is the way of life with ssb contesting.  Would like other input from your
experiences.

 

Thanks

 

David, ND4Y  (KS3, KS2, KX2 owner)



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[Jim Rhodes-3]

And don't forget the AGC and RF gain settings. Often those nasty signals
can be minimized by proper use of the two. Modern receivers tend to have
better dynamic range and sometimes those nasty, wide signals can be reduced
in strength so that the filters can do a better job.

On Sep 2, 2016 1:19 PM, <[hidden email]> wrote:

> David,
> Jim is spot on about wide dirty signals getting into your passband. The
> best you can do is play with the band width and shift to find a combination
> that limits the interference and makes the signal you are trying to copy,
> more copyable. For SSB contesting I will use the 2.1khz filter with a bit
> of DSP and also some shift to knock down the interfering station. I will
> say, the K3/S is far superior to the 756ProIII I had prior in this regard,
> from sharp filtering and AGC pumping. I can usually knock out a strong wide
> signal well into the passband I am listening, so that I can copy the weaker
> station.
>
> I am amazed though how close these days SSB contesters "overlap"
> intentionally into someone else's frequency, sharing half of the 2.7khz
> band width! That's one reason I prefer and enjoy CW and RTTY contests over
> SSB contests. Much more pleasing on the ears and temper!
>
> 73, Gene N9TF
> K3S 10057
>
> ----- Original Message -----
>
> From: "David Smith" <[hidden email]>
> To: "elecraft" <[hidden email]>
> Sent: Friday, September 2, 2016 12:50:36 PM
> Subject: [Elecraft] SSB Contesting filtering out contesters
>
> Have a question I feel I know the answer to.  I am an avid contester and
> when contesting thru the years (since 1978 and especially on 40 meters)
> have
> always had problems filtering out on my receive other contest stations who
> bleed over to my receive frequency their signals so I care hear the weaker
> stations coming back to me, mainly domestic contests.  Thru the years
> operated IC 765, Omni 6+ and now the K3S.  Still with DSP filtering, etc. I
> feel this is a way of life with contesting.  Have had this discussion with
> many of my big gun contesters and we feel this must be a way of life with
> ssb contests.  CW contests are much easier to filter out the side to side
> stations.  My directional antennas on these bands help a lot but guess this
> is the way of life with ssb contesting.  Would like other input from your
> experiences.
>
>
>
> Thanks
>
>
>
> David, ND4Y  (KS3, KS2, KX2 owner)
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
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>
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>
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[Phil Wheeler-2]

True magic for non-contesters would be to filter
out all contesters and have a quiet band :-)

Guess that's called "Move to WARC bands".

Phil W7OX

On 9/2/16 10:50 AM, David Smith wrote:

> Have a question I feel I know the answer to.  I am an avid contester and
> when contesting thru the years (since 1978 and especially on 40 meters) have
> always had problems filtering out on my receive other contest stations who
> bleed over to my receive frequency their signals so I care hear the weaker
> stations coming back to me, mainly domestic contests.  Thru the years
> operated IC 765, Omni 6+ and now the K3S.  Still with DSP filtering, etc. I
> feel this is a way of life with contesting.  Have had this discussion with
> many of my big gun contesters and we feel this must be a way of life with
> ssb contests.  CW contests are much easier to filter out the side to side
> stations.  My directional antennas on these bands help a lot but guess this
> is the way of life with ssb contesting.  Would like other input from your
> experiences.
>
>  
>
> Thanks
>
>  
>
> David, ND4Y  (KS3, KS2, KX2 owner)

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