K3 - 2.73/1.98 Clicks on Power On

[Mike Scott-7]

The power on rush of noise is almost earsplitting here in headset and
external speakers, K3 serial 509. It lasts for about a quarter of a second.
If I had the volume turned up it could cause damage to a speaker or my ears,
it is that loud. For this reason alone it should be a high priority fix.
Perhaps just blank the receiver in the turn on sequence for enough time to
cover the transient.

It has existed over the last several firmware updates. I notice that it is
worse when the bandwidth is set wider such as 2.7 KHz SSB mode. It does not
matter if a signal is present or not. I have high background noise level
here (S-7) so I expect that might be equivalent to having a signal present.

When set for CW at 400 Hz the momentary noise is there but much-much subdued
and not objectionable at all so CW operators may not notice the effect. The
effect is there in SSB/Data/CW modes. I don't hear it in AM/13KHz.


Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311


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[Eric Swartz - WA6HHQ]

Hi Mike,

It is. This is something that doesn't show up all the time so we were
not aware of it until it was noted here on the list recently.

We're adding an additional power on mute time delay to the firmware
right now.

73, Eric

Mike Scott wrote:

> The power on rush of noise is almost earsplitting here in headset and
> external speakers, K3 serial 509. It lasts for about a quarter of a second.
> If I had the volume turned up it could cause damage to a speaker or my ears,
> it is that loud. For this reason alone it should be a high priority fix.
> Perhaps just blank the receiver in the turn on sequence for enough time to
> cover the transient.
>
> It has existed over the last several firmware updates. I notice that it is
> worse when the bandwidth is set wider such as 2.7 KHz SSB mode. It does not
> matter if a signal is present or not. I have high background noise level
> here (S-7) so I expect that might be equivalent to having a signal present.
>
> When set for CW at 400 Hz the momentary noise is there but much-much subdued
> and not objectionable at all so CW operators may not notice the effect. The
> effect is there in SSB/Data/CW modes. I don't hear it in AM/13KHz.
>
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> K3-100 #508/ KX1  #1311
>
>  

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[ON4WIX]

No problems here. My K3/100 #0192 loaded with the latest FW switches on
without any bursts of noise. Just a few relay clicks and the radio comes to
life as one would expect.

73
Glenn ON4WIX
----- Original Message -----
From: "Mike Scott" <[hidden email]>
To: <[hidden email]>
Sent: Friday, December 12, 2008 9:41 PM
Subject: [Elecraft] K3 - 2.73/1.98 Clicks on Power On

> The power on rush of noise is almost earsplitting here in headset and
> external speakers, K3 serial 509. It lasts for about a quarter of a
> second.
> If I had the volume turned up it could cause damage to a speaker or my
> ears,
> it is that loud. For this reason alone it should be a high priority fix.
> Perhaps just blank the receiver in the turn on sequence for enough time to
> cover the transient.
>
> It has existed over the last several firmware updates. I notice that it is
> worse when the bandwidth is set wider such as 2.7 KHz SSB mode. It does
> not
> matter if a signal is present or not. I have high background noise level
> here (S-7) so I expect that might be equivalent to having a signal
> present.
>
> When set for CW at 400 Hz the momentary noise is there but much-much
> subdued
> and not objectionable at all so CW operators may not notice the effect.
> The
> effect is there in SSB/Data/CW modes. I don't hear it in AM/13KHz.
>
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> K3-100 #508/ KX1  #1311
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Elecraft web page: http://www.elecraft.com

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9:02

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[N5GE]

On Fri, 12 Dec 2008 12:41:30 -0800, you wrote:

>The power on rush of noise is almost earsplitting here in headset and
>external speakers, K3 serial 509. It lasts for about a quarter of a second.
>If I had the volume turned up it could cause damage to a speaker or my ears,
>it is that loud. For this reason alone it should be a high priority fix.
>Perhaps just blank the receiver in the turn on sequence for enough time to
>cover the transient.
>
>It has existed over the last several firmware updates. I notice that it is
>worse when the bandwidth is set wider such as 2.7 KHz SSB mode. It does not
>matter if a signal is present or not. I have high background noise level
>here (S-7) so I expect that might be equivalent to having a signal present.
>
>When set for CW at 400 Hz the momentary noise is there but much-much subdued
>and not objectionable at all so CW operators may not notice the effect. The
>effect is there in SSB/Data/CW modes. I don't hear it in AM/13KHz.
>
>
>Mike Scott - AE6WA
>Tarzana, CA (DM04 / near LA)
>K3-100 #508/ KX1  #1311

[snip]

I do not experience this anomaly at all.

Tom Hinson Childers, N5GE

K3 #806, XV144, XV432
Mini-Modules

http://www.eQSL.cc/Member.cfm?N5GE 
http://www.n5ge.com
http://www.swotrc.net

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[Stewart Baker]

That should take care of it....

T.I.A.

73
Stewart G3RXQ
On Fri, 12 Dec 2008 12:47:29 -0800, Eric Swartz - WA6HHQ, Elecraft
wrote:
> Hi Mike,
>
> It is. This is something that doesn't show up all the time so we
were
> not aware of it until it was noted here on the list recently.
>
> We're adding an additional power on mute time delay to the
firmware
> right now.
>
> 73, Eric
>
> Mike Scott wrote:
>> The power on rush of noise is almost earsplitting here in
headset and
>> external speakers, K3 serial 509. It lasts for about a quarter
of a second.
>> If I had the volume turned up it could cause damage to a
speaker or my ears,
>> it is that loud. For this reason alone it should be a high
priority fix.
>> Perhaps just blank the receiver in the turn on sequence for
enough time to
>> cover the transient.
>>
>> It has existed over the last several firmware updates. I notice
that it is
>> worse when the bandwidth is set wider such as 2.7 KHz SSB mode.
It does not
>> matter if a signal is present or not. I have high background
noise level
>> here (S-7) so I expect that might be equivalent to having a
signal present.
>>
>> When set for CW at 400 Hz the momentary noise is there but
much-much subdued
>> and not objectionable at all so CW operators may not notice the
effect. The
>> effect is there in SSB/Data/CW modes. I don't hear it in
AM/13KHz.

>>
>>
>> Mike Scott - AE6WA
>> Tarzana, CA (DM04 / near LA)
>> K3-100 #508/ KX1  #1311
>>
>>
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
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> Elecraft web page: http://www.elecraft.com

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