Re: [Elecraft] [K3] Width Control and AF Output Level

[Keith Onishi]

My friend informed me that setting 0 to all section of RX EQ solved the AF 
output level change issue.
Many thanks to all for your suggestions.

73 de JH3SIF, Keith

> 2015/09/14 18:12、Mike K2MK  のメール：
> 
> Hi Keith,
> 
> I think the problem is in the setting for the RXEQ. You do not want to use
> +db boost for CW. As I understand it, RXEQ is disabled at 100Hz and 50Hz
> width. So if he has boosted a particular frequency by 10db then when he
> narrows the bandwidth he will suddenly hear a loss of audio signal of 10db.
> To solve this problem keep the RXEQ set to 0 db for the frequencies of
> interest and use negative db settings for the frequencies of no interest.
> 
> 73,
> Mike K2MK
> 
> 
> Keith Onishi wrote
>> One of my friend K3 users report that AF output level with 100Hz passband
>> width is lower than with 150Hz passband width. He also reported that a
>> noise like “Ptsu” was generated on reducing passband width from 150Hz to
>> 100Hz. He had guessed that these were specific to his K3, but some other
>> K3 users including myself reported the same.
>> Some extreme users who use this narrow passband may have been bothered by
>> this reduced AF output level and noise. If the AF output level change is
>> caused by K3 DSP filter design or program, adding automatic gain
>> compensation feature to keep same AF output level would be highly welcome.
>> 
>> 73 de JH3SIF, Keith
> 
> 
> 
> 
> 
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/K3-Width-Control-and-AF-Output-Level-tp7607595p7607610.html
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Re: [Elecraft] [K3] Width Control and AF Output Level

[Keith Onishi]

Hi Bob,

Many thanks for your suggestion.
I sent you my reply, but your mail server rejected as a possible abuse.

> Hi Kieth,
> 
>it is nor necessary to set all to 0db.   Just do not use the EQ 
> for peaking.  He can still use roll off of the undesired lows and highs 
> leaving the mid range flat that covers the beat frequencies (pitch) of 
> interest.
> 
> 73,
> Bob
> K2TK   ex KN2TKR (1956) & K2TKR

73 de JH3SIF, Keith

> 2015/09/15 6:39、Keith Onishi  のメール：
> 
> My friend informed me that setting 0 to all section of RX EQ solved the AF 
> output level change issue.
> Many thanks to all for your suggestions.
> 
> 73 de JH3SIF, Keith
> 
>> 2015/09/14 18:12、Mike K2MK  のメール：
>> 
>> Hi Keith,
>> 
>> I think the problem is in the setting for the RXEQ. You do not want to use
>> +db boost for CW. As I understand it, RXEQ is disabled at 100Hz and 50Hz
>> width. So if he has boosted a particular frequency by 10db then when he
>> narrows the bandwidth he will suddenly hear a loss of audio signal of 10db.
>> To solve this problem keep the RXEQ set to 0 db for the frequencies of
>> interest and use negative db settings for the frequencies of no interest.
>> 
>> 73,
>> Mike K2MK
>> 
>> 
>> Keith Onishi wrote
>>> One of my friend K3 users report that AF output level with 100Hz passband
>>> width is lower than with 150Hz passband width. He also reported that a
>>> noise like “Ptsu” was generated on reducing passband width from 150Hz to
>>> 100Hz. He had guessed that these were specific to his K3, but some other
>>> K3 users including myself reported the same.
>>> Some extreme users who use this narrow passband may have been bothered by
>>> this reduced AF output level and noise. If the AF output level change is
>>> caused by K3 DSP filter design or program, adding automatic gain
>>> compensation feature to keep same AF output level would be highly welcome.
>>> 
>>> 73 de JH3SIF, Keith
>> 
>> 
>> 
>> 
>> 
>> --
>> View this message in context: 
>> http://elecraft.365791.n2.nabble.com/K3-Width-Control-and-AF-Output-Level-tp7607595p7607610.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
>> __
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Re: [Elecraft] [K3] Width Control and AF Output Level

[Mike K2MK]

Hi Keith,

I think the problem is in the setting for the RXEQ. You do not want to use
+db boost for CW. As I understand it, RXEQ is disabled at 100Hz and 50Hz
width. So if he has boosted a particular frequency by 10db then when he
narrows the bandwidth he will suddenly hear a loss of audio signal of 10db.
To solve this problem keep the RXEQ set to 0 db for the frequencies of
interest and use negative db settings for the frequencies of no interest.

73,
Mike K2MK


Keith Onishi wrote
> One of my friend K3 users report that AF output level with 100Hz passband
> width is lower than with 150Hz passband width. He also reported that a
> noise like “Ptsu” was generated on reducing passband width from 150Hz to
> 100Hz. He had guessed that these were specific to his K3, but some other
> K3 users including myself reported the same.
> Some extreme users who use this narrow passband may have been bothered by
> this reduced AF output level and noise. If the AF output level change is
> caused by K3 DSP filter design or program, adding automatic gain
> compensation feature to keep same AF output level would be highly welcome.
> 
> 73 de JH3SIF, Keith





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[Elecraft] [K3] Width Control and AF Output Level

[Keith Onishi]

One of my friend K3 users report that AF output level with 100Hz passband width 
is lower than with 150Hz passband width. He also reported that a noise like 
“Ptsu” was generated on reducing passband width from 150Hz to 100Hz. He had 
guessed that these were specific to his K3, but some other K3 users including 
myself reported the same.
Some extreme users who use this narrow passband may have been bothered by this 
reduced AF output level and noise. If the AF output level change is caused by 
K3 DSP filter design or program, adding automatic gain compensation feature to 
keep same AF output level would be highly welcome.

73 de JH3SIF, Keith

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Re: [Elecraft] [K3] Width Control and AF Output Level

[Joe Subich, W4TV]

RX EQ is disabled when moving from 150 Hz to 100 Hz ...

73,

   ... Joe, W4TV


On 9/13/2015 10:41 PM, Keith Onishi wrote:

One of my friend K3 users report that AF output level with 100Hz passband width 
is lower than with 150Hz passband width. He also reported that a noise like 
“Ptsu” was generated on reducing passband width from 150Hz to 100Hz. He had 
guessed that these were specific to his K3, but some other K3 users including 
myself reported the same.
Some extreme users who use this narrow passband may have been bothered by this 
reduced AF output level and noise. If the AF output level change is caused by 
K3 DSP filter design or program, adding automatic gain compensation feature to 
keep same AF output level would be highly welcome.

73 de JH3SIF, Keith

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Re: [Elecraft] [K3] Width Control and AF Output Level

[Lyle Johnson]

Check if IIR or FIR filtering is selected for the narrowest bands.

Also note that the receiver equalizer is not used in the 50 Hz and 100 
Hz widths, so if the radio is set up for a boost at the selected pitch 
frequency, the amplitude will drop.  Be sure the receiver equalizer is 
set to o in the frequencies that include the desired pitch.


Please see the manual for details on how to check and do these if you 
are uncertain.


73,

Lyle KK7P


...AF output level with 100Hz passband width is lower than with 150Hz passband 
width. He also reported that a noise like “Ptsu” was generated on reducing 
passband width from 150Hz to 100Hz. He had guessed that these were specific to 
his K3, but some other K3 users including myself reported the same.
Some extreme users who use this narrow passband may have been bothered by this 
reduced AF output level and noise...


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Re: [Elecraft] [K3] Width Control and AF Output Level

[Fred Jensen]

Ummm ... on my K3 [#642 but upgraded by Elecraft and with new synth], 
the noise level decreases as I narrow the BW, pretty much just like 
information theory says it should.  On the other hand, a CW signal 
centered in the passband doesn't change much if at all.  I'm pretty sure 
that's how it's supposed to work.  I can detect a tiny decrease in the 
signal level but it is just discernable, nothing big or a problem.


I normally run CW in contests at 250 Hz, sometimes 200 Hz, I have used 
100 Hz occasionally when necessary.  I don't think I've ever used 50 Hz, 
CW sidebands at 30 WPM exceed that and the code elements start to run 
together from ISI.


73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 9/13/2015 7:41 PM, Keith Onishi wrote:

One of my friend K3 users report that AF output level with 100Hz
passband width is lower than with 150Hz passband width. He also
reported that a noise like “Ptsu” was generated on reducing passband
width from 150Hz to 100Hz. He had guessed that these were specific to
his K3, but some other K3 users including myself reported the same.
Some extreme users who use this narrow passband may have been
bothered by this reduced AF output level and noise. If the AF output
level change is caused by K3 DSP filter design or program, adding
automatic gain compensation feature to keep same AF output level
would be highly welcome.

73 de JH3SIF, Keith

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Re: [Elecraft] [K3] Width Control and AF Output Level

[Keith Onishi]

Hi Lyle. Thanks for your suggestions.
I am going to talk to my friend on them.

73 de JH3SIF, Keith

> 2015/09/14 11:58、Lyle Johnson  のメール：
> 
> Check if IIR or FIR filtering is selected for the narrowest bands.
> 
> Also note that the receiver equalizer is not used in the 50 Hz and 100 Hz 
> widths, so if the radio is set up for a boost at the selected pitch 
> frequency, the amplitude will drop.  Be sure the receiver equalizer is set to 
> o in the frequencies that include the desired pitch.
> 
> Please see the manual for details on how to check and do these if you are 
> uncertain.
> 
> 73,
> 
> Lyle KK7P
> 
>> ...AF output level with 100Hz passband width is lower than with 150Hz 
>> passband width. He also reported that a noise like “Ptsu” was generated on 
>> reducing passband width from 150Hz to 100Hz. He had guessed that these were 
>> specific to his K3, but some other K3 users including myself reported the 
>> same.
>> Some extreme users who use this narrow passband may have been bothered by 
>> this reduced AF output level and noise...
> 
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