After working just fine (no phones plugged in== speaker on, phones plugged
in == speaker cuts off), I just removed my headphones and have no speaker
output.
I immediately checked the SPKR+PH setting, usually set to no, and
adjusted it to yes. At that point I have output from the speakers. So
Bob,
Try inserting the headphone plug and removing it several times (with the
SPKR+ PH menu set to NO).
The wiping action of the contacts on the headphone jack may restore
proper speaker response.
Further explanation - if you normally use headphones, oxidation can
occur on the contact
New K3 with latest firmware. Newbie user. HRD Software.
Situation: Set speaker output volume for comfortable sounding CW and SSB (RF
gain close to 'full'). Then when going to data mode the same (CW or SSB)
signals blast me out of the shack - very very loud requiring me to
substantially back
I wonder if you have AGC turned off in DATA mode? What appears after
AGC- on the display? AGC mode is remembered per-mode
73,
~iain / N6ML
On Mon, Jan 14, 2013 at 5:17 PM, rich kennedy astro_maryl...@yahoo.com wrote:
New K3 with latest firmware. Newbie user. HRD Software.
If I remember correctly, the speaker is also very sensitive to distortion
of its metal frame (and therefore cone) if you tighten down the nuts too
much. You may have already tried this but try backing them off and
readjusting them so they're finger tight and no more. If things rattle,
tighten down
Andrew,
That is true for the standard speaker, but with the KBT1, the speaker is
changed to a smaller one that has no mounting screws, it just sits with
its magnet settled into the hole in the battery bracket - it needs to
have a foam washer around its magnet to kee3p it from creating rattlie
Yes, and if the speaker does not have an airtight seal between it and the
baffle (the cover on the rig in this case) the mid and lower frequencies
will be highly attenuated.
When the cone moves forward on a bare speaker, the air pressure created
simply moves around the edges and fills the
On 4/20/2012 7:29 PM, Ron D'Eau Claire wrote:
When the cone moves forward on a bare speaker, the air pressure created
simply moves around the edges and fills the partial vacuum created behind.
The end result is no sound pressure waves leaving the speaker. The only
waves created are those high
I just purchased this K1 used. I have had others in the past, but this is the
first with the battery option. It seems as though the audio from the speaker
is no where near what I remember on other k1's. Is this common with the
speaker on the case for the battery option?
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I would not call it wimpy, but that smaller speaker used with the
battery option is a bit on the tinny side.
Refer to the KBT1 instruction manual and check to be sure the speaker
has the little foam ring and that it is inserted properly.
Another point with that internal battery option - I have
Thanks. Glad its not me!
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Home:
For those who would like to read up on the LM4950TS device with which
some have experienced failure, here is the link.
http://www.national.com/ds/LM/LM4950.pdf
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Bill VanAlstyne W5WVO wrote:
I have (and have always had) mine set to 20 also. Didn't help, in this
instance.
I often turn the AGC off when running JT65A on 20m using the JT65-HF
software, so that a strong signal somewhere in the 2 kHz passband doesn't
trigger the AGC and wipe out a
: [Elecraft] [K3] Speaker output amp kaput
Bill VanAlstyne W5WVO wrote:
I have (and have always had) mine set to 20 also. Didn't help, in this
instance.
I often turn the AGC off when running JT65A on 20m using the JT65-HF
software, so that a strong signal somewhere in the 2 kHz passband
I recently fried (I believe) the speaker amplifier in my K3, apparently by
just turning off the radio and turning it back on too quickly. Perhaps the
fact that the AGC was disabled at the time might have had something to do
with this, though that is just a guess. I accidentally turned off the
To: [Elecraft] elecraft@mailman.qth.net
Subject: [Elecraft] [K3] Speaker output amp kaput
I recently fried (I believe) the speaker amplifier in my K3,
apparently by
just turning off the radio and turning it back on too quickly.
Perhaps the
fact that the AGC was disabled at the time might have had
Bill,
Look at your K3 manual page 53. and note the menu item AF LIM. After
seeing the posts on the amp failure, I immediate set this to limit the
AF output to safe levels as I frequently operate without the AGC being
ON (digital modes). I have mine set to 20, just arbitrary, half
.
Bill W5WVO
--
From: JAMES ROGERS w4...@bellsouth.net
Sent: Wednesday, October 06, 2010 22:01
To: Bill VanAlstyne W5WVO w5...@cybermesa.net
Cc: [Elecraft] elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Speaker output amp kaput
Bill,
Look
I just installed the KRX3. As instructed, I have set SPKRS 1 in the CONFIG
menu. I do
not have an external speaker plugged in.
The problem is that there is no audio from the internal speaker. The headphone
jack on the
front panel works OK. The speaker is plugged in to the correct place (P25)
When you turn on the rig, do you hear a pop? Or the same when you power
down?
As much as I hate to admit it, my speaker was not working when I got it. I
only knew, as was building K3#1931 along with another fellow building his.
We plugged in his speaker and all was OK!!!
But the fine folks
I have an identical problem. Also the output from the rear headphones jack is
to one ear only and the packet output is null with the default setting.
Because I also have another problem (PA trips at high power on 10m only),
the radio is going for service.
Ignacy
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The symptoms were without KRX3. Sorry for the omission.
Ignacy
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Carsten -
I am experiencing the same problem. At this point, after confirming that
it's not the KAIO3 boards, Elecraft suspects a bad DSP board, and they're
sending me a replacement. I'm hoping this resolves the problem.
Good luck 73,
Steve NN4X
On Tue, Dec 9, 2008 at 5:34 AM, Carsten
Hi there,
I have a little problem with K3 #549. I do not get AF out of the internal
Speaker
or rear-panel Speaker output. I am usually using headphones so only noticed it
recently in Senegal when I wanted to have my YL listen to a sked with home.
It doesn't seem to be a hardware problem
I also have the same problem and getting a new DSP board.
Ignacy
S Sacco wrote:
Carsten -
I am experiencing the same problem. At this point, after confirming that
it's not the KAIO3 boards, Elecraft suspects a bad DSP board, and they're
sending me a replacement. I'm hoping this
Hi Bob,
Finally, I got it !.
It is related with the RC network connected between the output pin 5 and
ground, required to keep the amplifier stable at high frequencies at
different loads, as you mention on your previous post.
I checked the RC network and I even installed a new one: same
Hi Paco,
Great detective work, glad to read that you tamed the beast. Hi Hi
I am in the process of trying to model the LM386 circuits using LT spice
( program free from Linear Technologies web site SWCAD III) to try to
understand the feedback mechanism that results in these amplifier's
Paco,
Thanks for posting the solution to this problem. I feel sure there are
a number of us who read about it with interest but did not comment.
Good to know the answer to the problem!!
73 de dave
ab9ca
Francisco Barros wrote:
Hi Bob,
Finally, I got it !.
It is related with the RC
Hi Dave,
Thanks to you.
IHope Bob can tell us, with the modeling of the LM386, why this strange
behaviour.
From the knowledge point of view, the technique try and error is not the
best way, we would like to know more... .
Now, my KX1, at the LM386's speaker output, pin 5, has the original RC
Hi Bob,
Hate to say it, but it has the same behaviour with the new value of 4.7k for
R21: the audio signal shows the parasitic oscillation just on the negative
peaks, even with a 10 uV RF level.
In any case, many thanks !.
73,
Paco
Hi Paco,
Sorry to read that it did not work for you.
LM386 amplifiers can do strange things when over driven. There is a lot
of available gain.
If the amplifier is operating properly, the Idle DC voltage with no audio
signal on the output pin 5 should be half of the DC voltage measured on
the
Paco,
That certainly sounds like the strong station is overdriving the LM386,
and that the overdrive point changes depending on the load to the
LM386. Try reducing the RF gain to see if the condition is improved.
The LM386 characteristics are different than the LM380 AF Amp used in
the K2,
Hi Don
First of all, thanks for your answer.
Well, I have checked it also with a signal generator: the output signal at
R3 (AF Gain) R5 junction is always a clean 2,2 Vpp 600 Hz tone, with RF
levels of 10 uV till 500 uV, except at close or maximum volumen. I this
case, even with a 10 uV RF
Try changing the value of R21 from 2.7K to 4.7K
I had a similar problem with load sensitive parasitic oscillation of the
LM386 with a Norcal 40
When this happens it can block the receive signal because of the agc
action.
The (high frequency rolloff) feedback may be causing enough phase shift
to
Hi to all,
The scope shows a superimposed high frequency oscillation just on the
negative peaks of the audio signal.
It produces a distorted and annoying audio when the signal peaks, specially
when listening a loud station on the external speaker.
This happens when the volume is close to or at
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