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K3 RX Equalizer

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Chris Hallinan

K3 RX Equalizer

I understand that the K3 has two separate equalizer settings for CW and
SSB. I also understand it is not active in the Data modes.

However, there are four sources of audio output:

1) Internal Speaker
2) SPKRS (rear panel)
3) Phones (front panel)
4) Line Out (rear panel)

Does the equalizer operate for all four outputs?

Thanks,

Chris
K1AY

--
Life is like Linux - it never stands still.
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Lyle Johnson

Re: K3 RX Equalizer

Yes.

73,

Lyle KK7P

On 12/29/17 9:53 AM, Chris Hallinan wrote:

> I understand that the K3 has two separate equalizer settings for CW and
> SSB. I also understand it is not active in the Data modes.
>
> However, there are four sources of audio output:
>
> 1) Internal Speaker
> 2) SPKRS (rear panel)
> 3) Phones (front panel)
> 4) Line Out (rear panel)
>
> Does the equalizer operate for all four outputs?
>
> Thanks,
>
> Chris
> K1AY
>

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Nr4c

Re: K3 RX Equalizer

In reply to this post by Chris Hallinan

Prob the first 3. The 4th is mostly for digital and thus not needed.

Sent from my iPhone
...nr4c. bill

> On Dec 29, 2017, at 11:53 AM, Chris Hallinan <[hidden email]> wrote:
>
> I understand that the K3 has two separate equalizer settings for CW and
> SSB. I also understand it is not active in the Data modes.
>
> However, there are four sources of audio output:
>
> 1) Internal Speaker
> 2) SPKRS (rear panel)
> 3) Phones (front panel)
> 4) Line Out (rear panel)
>
> Does the equalizer operate for all four outputs?
>
> Thanks,
>
> Chris
> K1AY
>
> --
> Life is like Linux - it never stands still.
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

Lyle Johnson

Re: K3 RX Equalizer

The K3 filter is a little unusual in that the receiver equalizer is part
of the DSP bandpass filter, not a different or subsequent filter. This
helps minimize latency.

As a result, the equalization is applied before the audio paths are
separated, so it is on all receive paths.

In data modes, the equalizer is disabled (the filter coefficients are
re-computed ignoring the equalizer settings).

73,

Lyle KK7P (author of the K3 DSP code)

> Prob the first 3. The 4th is mostly for digital and thus not needed.
>
>> On Dec 29, 2017, at 11:53 AM, Chris Hallinan <[hidden email]> wrote:
>>
>> I understand that the K3 has two separate equalizer settings for CW and
>> SSB. I also understand it is not active in the Data modes.
>>
>> However, there are four sources of audio output:
>>
>> 1) Internal Speaker
>> 2) SPKRS (rear panel)
>> 3) Phones (front panel)
>> 4) Line Out (rear panel)
>>
>> Does the equalizer operate for all four outputs?

Chris Hallinan

Re: K3 RX Equalizer

In reply to this post by Lyle Johnson

Hi, Lyle.

Thanks for helping me understand the K3 even better ;)

I'm working on building a remote solution using remotehams.com software. I
hope I can use my SignaLink USB as the TX/RX audio interface to the
server. I can hear very nicely on the remote (same room still!), but the
transmit audio seems very low. Basically I've set MIC SEL to LineIn, and
selected my SignaLink USB as the audio source for the server. I'm still
experimenting with levels, etc, and that's what led to the question.

Best regards,

Chris
K1AY

On Fri, Dec 29, 2017 at 12:04 PM, Lyle Johnson <[hidden email]> wrote:

> Yes.
>
> 73,
>
> Lyle KK7P
>
>
> On 12/29/17 9:53 AM, Chris Hallinan wrote:
>
>> I understand that the K3 has two separate equalizer settings for CW and
>> SSB. I also understand it is not active in the Data modes.
>>
>> However, there are four sources of audio output:
>>
>> 1) Internal Speaker
>> 2) SPKRS (rear panel)
>> 3) Phones (front panel)
>> 4) Line Out (rear panel)
>>
>> Does the equalizer operate for all four outputs?
>>
>> Thanks,
>>
>> Chris
>> K1AY
>>
>>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

--
Life is like Linux - it never stands still.
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Nr4c

Re: K3 RX Equalizer

So I’m correct. The EQ is disabled in digital modes.

Sent from my iPhone
...nr4c. bill

> On Dec 29, 2017, at 4:02 PM, Chris Hallinan <[hidden email]> wrote:
>
> Hi, Lyle.
>
> Thanks for helping me understand the K3 even better ;)
>
> I'm working on building a remote solution using remotehams.com software. I
> hope I can use my SignaLink USB as the TX/RX audio interface to the
> server. I can hear very nicely on the remote (same room still!), but the
> transmit audio seems very low. Basically I've set MIC SEL to LineIn, and
> selected my SignaLink USB as the audio source for the server. I'm still
> experimenting with levels, etc, and that's what led to the question.
>
> Best regards,
>
> Chris
> K1AY
>
>
>> On Fri, Dec 29, 2017 at 12:04 PM, Lyle Johnson <[hidden email]> wrote:
>>
>> Yes.
>>
>> 73,
>>
>> Lyle KK7P
>>
>>
>>> On 12/29/17 9:53 AM, Chris Hallinan wrote:
>>>
>>> I understand that the K3 has two separate equalizer settings for CW and
>>> SSB. I also understand it is not active in the Data modes.
>>>
>>> However, there are four sources of audio output:
>>>
>>> 1) Internal Speaker
>>> 2) SPKRS (rear panel)
>>> 3) Phones (front panel)
>>> 4) Line Out (rear panel)
>>>
>>> Does the equalizer operate for all four outputs?
>>>
>>> Thanks,
>>>
>>> Chris
>>> K1AY
>>>
>>>
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
>>
>
>
>
> --
> Life is like Linux - it never stands still.
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

Jim Brown-10

Re: K3 RX Equalizer

In reply to this post by Lyle Johnson

On 12/29/2017 12:52 PM, Walter Underwood wrote:
> That would suggest that using hi-cut is a better choice than RX EQ for cutting high frequency hiss. The ultimate rejection for hi-cut is greater than the max RX EQ cut, right?

The smarter guys writing software for digital modes have finally learned
what we learned in the world of pro audio at least 40 years ago --
filters introduce phase shift, and both our ears decoding speech and
software decoding digital signals don't like the time smear that comes
with it. In general, the steeper the amplitude response, the more phase
shift occurs in the passband.

Current recommendations for RTTY decoding is 500 Hz bandwidth, and this
is echoed by guys who regularly WIN major RTTY contests. Indeed, the
double-hump RTTY filter built into firmware for K3/K3S/KX2/KX3 is no
longer recommended. K1JT urges WSJT-X users to run the receiver IF wide
open and let the software do the discrimination between signals. I set
my K3 IF to its widest settings.

The same thing happens when narrow filters are used on CW in the
presence of static -- the crashes ring the filters, defeating the
purpose of reducing overall noise level. K3/K3S firmware has some
specially shaped filters to minimize this effect. RTFM to learn about them.

73, Jim K9YC

73, Jim K9YC

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Don Wilhelm

Re: K3 RX Equalizer

In reply to this post by Chris Hallinan

Chris,

To set the levels for DATA modes on Elecraft transceivers, see my
website www.w3fpr.com. Go to the bottom of the left column and click
the link.

Yes, the Elecraft transceivers are different than other radios - you
must first set the audio level to produce 4 bars with the 5th bar
flashing on the ALC meter.

73,
Don W3FPR

On 12/29/2017 4:02 PM, Chris Hallinan wrote:

> Hi, Lyle.
>
> Thanks for helping me understand the K3 even better ;)
>
> I'm working on building a remote solution using remotehams.com software. I
> hope I can use my SignaLink USB as the TX/RX audio interface to the
> server. I can hear very nicely on the remote (same room still!), but the
> transmit audio seems very low. Basically I've set MIC SEL to LineIn, and
> selected my SignaLink USB as the audio source for the server. I'm still
> experimenting with levels, etc, and that's what led to the question.
>
> Best regards,
>
> Chris
> K1AY
>
>
> On Fri, Dec 29, 2017 at 12:04 PM, Lyle Johnson <[hidden email]> wrote:
>
>> Yes.
>>
>> 73,
>>
>> Lyle KK7P
>>
>>
>> On 12/29/17 9:53 AM, Chris Hallinan wrote:
>>
>>> I understand that the K3 has two separate equalizer settings for CW and
>>> SSB. I also understand it is not active in the Data modes.
>>>
>>> However, there are four sources of audio output:
>>>
>>> 1) Internal Speaker
>>> 2) SPKRS (rear panel)
>>> 3) Phones (front panel)
>>> 4) Line Out (rear panel)
>>>
>>> Does the equalizer operate for all four outputs?
>>>
>>> Thanks,
>>>
>>> Chris
>>> K1AY
>>>
>>>
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
>>
>
>
>