K3 - CW Sidetone

[Mike Harris-9]

G'day,

Has anyone else noticed a slight chuffing of the CW sidetone when in QSK
mode.  The chuffing is absent when in manual TX.  I guess it's probably
the change over from band noise to sidetone.  Nevertheless it sounds odd.

Regards,

Mike VP8NO
#345

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[Vic K2VCO]

Mike Harris wrote:
> G'day,
>
> Has anyone else noticed a slight chuffing of the CW sidetone when in QSK
> mode.  The chuffing is absent when in manual TX.  I guess it's probably
> the change over from band noise to sidetone.  Nevertheless it sounds odd.

Mike,

Try reducing the audio gain a bit or increasing the sidetone level and
see if that reduces the phenomenon. If so, I believe it is exactly what
you say, the change-over, etc. I notice the same thing, and have viewed
the audio on a scope looking for artifacts and haven't found any.

There's a similar problem when there are a lot of signals in the
passband. I think it's because the QSK is *too* good -- very fast, and
the sidetone is shaped to match the RF output.

Wayne has talked about making some sidetone characteristics adjustable
to make it easier to monitor in noisy or crowded conditions. This is
probably not going to happen tomorrow, though!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Mike Harris-9]

----- Original Message -----
From: "Vic K2VCO" <[hidden email]>
To: "Mike Harris" <[hidden email]>
Cc: <[hidden email]>
Sent: Wednesday, February 27, 2008 1:12 PM
Subject: Re: [Elecraft] K3 - CW Sidetone


| Mike Harris wrote:
| > G'day,
| >
| > Has anyone else noticed a slight chuffing of the CW sidetone when in
QSK
| > mode.  The chuffing is absent when in manual TX.  I guess it's
probably
| > the change over from band noise to sidetone.  Nevertheless it sounds
odd.
|
| Mike,
|
| Try reducing the audio gain a bit or increasing the sidetone level and
| see if that reduces the phenomenon. If so, I believe it is exactly what
| you say, the change-over, etc. I notice the same thing, and have viewed
| the audio on a scope looking for artifacts and haven't found any.
|
| There's a similar problem when there are a lot of signals in the
| passband. I think it's because the QSK is *too* good -- very fast, and
| the sidetone is shaped to match the RF output.
|
| Wayne has talked about making some sidetone characteristics adjustable
| to make it easier to monitor in noisy or crowded conditions. This is
| probably not going to happen tomorrow, though!
| --
| 73,
| Vic, K2VCO
| Fresno CA
| http://www.qsl.net/k2vco

Hi,

It is indeed a balancing act between monitor and RX audio levels.  The
effect is most noticeable when using headphones.  The house here is pretty
quiet and I don't use a very high sidetone (monitor) level, around about
14.

It's not a problem, just an observation.  No secret hardware change
required.

Regards,

Mike VP8NO


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