K3: Audio Blast attack

[Steve Ellington]

Today I was listening around on 40m cw and messing with the "Shift" and
Width knobs. I had the NR turned on. I was running the Shift up and down the
range just casually listening to the noise pitch change. Retired people have
this kind of time. I had the width down to 50 hz then I hit the FIL button
to open things back up again and that's when it happened. The most
horrendous blast of audio I've ever heard. My face was about 12" from the 5
x 6" speaker and it almost blew my glasses off.  I have no doubt it was FULL
AF gain. I jumped and nearly soiled myself. My first instinct was to quickly
turn down the AF gain. I just barely turned the AF gain down and everything
went back to normal. After my heart calmed down I tried to retrace my steps
but have not been able to duplicate it. I guess it was a CPU glitch or
something but it sure knocked a few days off my life.
I had this happen to an Orion several times back before they got some of the
bugs out of it. At least I could duplicate and report it but this one has me
baffled.

Steve N4LQ
[hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[n7ws]

I had something similar (or perhaps the same) happen to me a few days ago, only I had headphones on.  Likewise I don't remember the exact circumstance.  I do remember getting yelled at by the XYL in the next room, however.  And I was never even in the Navy.


--- On Wed, 4/8/09, Steve Ellington <[hidden email]> wrote:

> From: Steve Ellington <[hidden email]>
> Subject: [Elecraft] K3: Audio Blast attack
> To: [hidden email]
> Date: Wednesday, April 8, 2009, 8:05 PM
> Today I was listening around on 40m cw and messing with the
> "Shift" and
> Width knobs. I had the NR turned on. I was running the
> Shift up and down the
> range just casually listening to the noise pitch change.
> Retired people have
> this kind of time. I had the width down to 50 hz then I hit
> the FIL button
> to open things back up again and that's when it
> happened. The most
> horrendous blast of audio I've ever heard. My face was
> about 12" from the 5
> x 6" speaker and it almost blew my glasses off.  I
> have no doubt it was FULL
> AF gain. I jumped and nearly soiled myself. My first
> instinct was to quickly
> turn down the AF gain. I just barely turned the AF gain
> down and everything
> went back to normal. After my heart calmed down I tried to
> retrace my steps
> but have not been able to duplicate it. I guess it was a
> CPU glitch or
> something but it sure knocked a few days off my life.
> I had this happen to an Orion several times back before
> they got some of the
> bugs out of it. At least I could duplicate and report it
> but this one has me
> baffled.
>
> Steve N4LQ
> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list:
> http://www.qsl.net/donate.html

     
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[wayne burdick]

Steve Ellington wrote:

> ... had the width down to 50 hz then I hit the FIL button
> to open things back up again and that's when it happened....

Steve,

Things like this should *never* happen -- our apologies. Please send me
your firmware revision numbers (use CONFIG:FW REVS) and a list of all
the receiver settings you were using, if possible, and we'll try to
duplicate and correct it. It would also be helpful to know what the
band noise and signals were like at the time.

73,
Wayne
N6KR

---

http://www.elecraft.com

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[KK7P]

>> ... had the width down to 50 hz then I hit the FIL button
>> to open things back up again and that's when it happened....
>
> Things like this should *never* happen -- our apologies. Please send me
> your firmware revision numbers (use CONFIG:FW REVS) and a list of all
> the receiver settings you were using,

and in particular your AGC settings (SLP, THR) and if there was a loud
signal, or loud high-pitched signal that was suddenly in the opened-up
passband, and your NR settings in effect at the time.

Also, was the blast a loud burst of noise (like the gain was suddenlky
turned up momentarily), or was it more like a shriek (a high pitched,
perhaps unstable, tone)?

73,

Lyle KK7P

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html