[Elecraft] K3 - CW Sidetone

[Mike Harris]

----- Original Message ----- 
From: "Vic K2VCO" <vic at rakefet.com>
To: "Mike Harris" <mike.harris at horizon.co.fk>
Cc: <Elecraft at mailman.qth.net>
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