date:20081213

Re: [Elecraft] K3 - 2.73/1.98 Clicks on Power On

2008-12-13 Thread 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
>>
>>
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[Elecraft] [K3] f/w 2.73/1.98 power calibration

2008-12-13 Thread Steve Ward



I just applied the latest beta firmware as I have done many times 
before, and it looks like this time my power calibration went out the 
window.  I'm putting out about 70w on PSK31 when I dialed in 45.


Just wanted to give folks a heads-up to watch their power output when 
they start operating under new firmware, it might be time to re-calibrate!


73,
Steve AD7OG
K3 #1544
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Re: [Elecraft] K3: Poor AM receive audio quality

2008-12-13 Thread VK5ABQ


Thanks for your replies guys. Hopefully Icom's SP20 makes a difference.

I've received too many emails privately to reply to each separately sorry so
I hope those who were kind enough to spend their time writing to me won't
mind if I answer all questions here?

I do have a KBPF3 general coverage bandpass filters installed and my
comments about the relatively poor audio quality referred to the sound
coming from the K3's internal speaker. While the R2000 sounds terrific using
a 6KHz max bandwidth to listen to AM broadcast, the K3 just does not sound
very nice at all despite being opened up to 10KHz bandwidth. I couldn't
believe how poor it sounded when I turned the rig on the first time (it was
factory assembled). I had that sinking feeling you get when you first
suspect you've not spent your money on what you should have.

At this stage I do expect the K3 will sound fine with the SP20, after all
50Hz and 100Hz were included in the RX EQ for a reason? It's a pity their
level doesn't make any difference when listening to the K3's internal
speaker.

-

Shane
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Re: [Elecraft] K3: Passband tuning questions

2008-12-13 Thread VK5ABQ


Sorry I made a mistake above. Where I typed 4.20KHz should be 4.00KHz.

Why the lack of replies? Isn't the passband tuning faulty?

Set the K3 to AM
Set Bandwidth to 10KHz
Set Fc to 1.50KHz
Switch to HI/LO cut and discover HI=4.00KHz and LO=0.00KHz. Shouldn't
HI=5.00KHz if bandwidth is set to 10KHz?

Thanks. 

-

Shane
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Re: [Elecraft] [K3} fatiguing auido, high noise environment

2008-12-13 Thread GM0ELP

I have found that having roofing filters automatically track the DSP filter
width is a bad idea in a noisy environment. My noise was best tackled with
the DSP NB rather than the hardware NB (ie. DSP NB 3-7, IF OFF).

The DSP NB still worked with a 1KHz roofing filter in line, but if a
narrower roofing filter was selected (400Hz) as a result of reducing the DSP
filter width, the DSP NB action vanished, and I was left with the same
horrible audio as you are describing.

I don't understand the full picture yet, but, DSP NB and NR need a wide
roofing filter width (>= 1KHz) to work effectively. However, any narrow DSP
filter width (as long as a wide roofing filter was selected) would still
still allow DSP NB and NR to work effectively (ie. roofing filter 1KHz, dsp
filter 200Hz). The automatic selection of roofing filters makes this
combination and many others impossible to select (e.g. if you have a 400Hz
roofing filter installed) without messing about with the Elecraft Utility
software and disabling filters.

My previous post suggested having a menu item that would allow the
automatic/manual selection of roofing filters (defaulted to Automatic) to
allow for better handling of selectivity in noisy situations.

Doug GM0ELP

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