[Elecraft] [K3] K3 and noise with external speakers

[Thomas Horsten]

Hi Art,

I totally have that problem as well, but I was more bothered by the other
one for now so that's why I wrote about it. It would be amazingly nice if
you could have the MON level track the AF level. In fact, it would be a
killer feature.

73, Thomas M0TRN

On 15 May 2012 22:41, Arthur Burke <aburkefl at gmail.com> wrote:

> My speaker approach was a pair of formerly "rear" speakers in a surround
> sound system - SONY in this case. Having stereo speakers provides (most of
> the time) the same effect as stereo headphones - when the sub-rx is on, DX
> from the left side and pileup from the right side - although it's easier to
> "work" through the pileup with phones.
>
> My problem is  not with the speaker/phone volume, but with the monitor
> (sidetone) volume. When it's set more-or-less normally for speaker use,
> it's much too loud for use with the "cans" on.
>
> My daily (and therefore also for DX) logging program is DXLabs. Commander
> provides a host of User Defined Controls - one of which I use to alter the
> monitor level - significantly lowering it before slapping on the
> headphones. Then, the second push, when I'm finished, restores MON to the
> old level.
>
> Art - N4PJ
>
>
>
> On Tue, May 15, 2012 at 5:08 PM, Thomas Horsten <thomas at horsten.com>wrote:
>
>> Hi,
>>
>> I like to alternate between operating with headset and speakers and find
>> the K3's built-in speaker inadequate (plus I want stereo). So I purchased
>> a
>> pair of Audioengine A2 speakers (black, and with the corresponding desk
>> stands, wonderful little speakers I must say and they look GREAT next to
>> the K3 - judge for yourself: http://goo.gl/KErTo)
>>
>> Now the problem is that I have been running with AGC=LOW since it gives me
>> a comfortable range in the headset. The speakers have a volume control on
>> the back, so I thought I could adjust that to get a volume that was
>> similar
>> in the headset. The problem is that with a low enough AF volume setting on
>> the K3 that the headset isn't blasting my ears out, and the speakers
>> volume
>> set to give a similar level to that of the headphones (about 66% of their
>> max), the speakers give a very noticable very low frequency bassy "click"
>> once a second anytime the K3 is turned on.
>>
>> It's like "thump, thump, thump" at one second intervals. This is loud
>> enough to be noticeable when the speakers and the headphones are at about
>> the same level for the real audio. If I turn the speakers' gain down and
>> turn the K3's AF knob up, I get FB loud enough audio without hearing this
>> problem, but with a low enough volume in the headset for it to be
>> comfortable, I have to turn the speakers up where the "thump" gets
>> noticable to get rid of it again.
>>
>> I'm powering my K3 from a car battery that is in turn hooked up to a smart
>> charger. This has never caused me any problems in the past, but it would
>> seem that this artifact comes from the smart charger somehow, as soon as I
>> disconnect it the problem goes away and I can have the speaker volume all
>> the way up to max without hearing it.
>>
>> As I said I've never had any audio (or other) problems before from having
>> that battery charger connected. Any suggestions for what to try next would
>> be appreciated.
>>
>> 73, Thomas M0TRN
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