I run a sidetone of around 550hz. During QRM conditions I rarely use the
shift control, but often using the width on the Kenwood TS590, narrowing
the filter as tight as 100hz if necessary. Really helps to cut out the
offending signals, also useful at times if there is a birdie nearby a
station I want to work.
73 John AF5CC
On Wed, Dec 15, 2021 at 7:02 PM Hans Brakob <kzerohb@gmail.com> wrote:
> I expect that the answers to the question will be variable, to a large
> degree, on the individuals ears, and will be particularly related to the
> sweet spot in their auditory “curve”.
>
> I have profound hearing loss above about 1000Hz, so I prefer a CW sidetone
> of about 300Hz. Disregard RX filtering/offset/shift for the moment, and
> consider “percentage of separation”.
>
> Using 300Hz sidetone, if another station fires up 100Hz away the
> percentage of separation is 33%. Generally my wetware filter can easily
> reject that signal. Naturally the judicious selection of hardware width,
> shift, and even RIT can improve this situation if needed.
>
> Now consider if I used a sidetone of 800Hz (for an example). The same
> fellow fires up 100Hz away. Now the percentage of separation drops to
> 12.5% (from 33%) and my wetware will have a much more difficult time
> rejecting the interference. Obviously I can still apply hardware-based
> rejection, but my awareness of the surrounding spectrum will suffer.
>
> Thus I have found that using a lower sidetone is the single most effective
> tool in dealing with crowded band conditions.
>
>
> 73, de Hans, KØHB
> “Just a Boy and his Radio”™
> ________________________________
> From: CQ-Contest <cq-contest-bounces+kzerohb=gmail.com@contesting.com> on
> behalf of Pete Smith N4ZR <pete.n4zr@gmail.com>
> Sent: Wednesday, December 15, 2021 10:56:04 AM
> To: reflector cq-contest <CQ-Contest@Contesting.COM>
> Subject: [CQ-Contest] Receiver adjustments in CW contest conditions
>
> I'm curious to know - except maybe on 160 or VHF, most of my receiving
> problems in CW contests seem to come from QRM. When I'm contesting, I
> find that the only RX controls I use on my K-3 are the main tuning or
> (when running) RIT - this despite having DSP control to shift and narrow
> my passband. I just go with my 500-Hz filter and my ears.
>
> So what do you do? What have you found useful - again, not in
> weak-signal situations, but in QRM.
>
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at<http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
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