[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 <jh3sif at sumaq.jp> 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 <k2mk at comcast.net> 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.
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to jh3sif at sumaq.jp
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to jh3sif at sumaq.jp