[Elecraft] K3 Popping noise in headphones??

[jim]

Joe, 

Thanks for the input, I will play with those settings and reply back to the
reflector.

Jim

W6AIM


.


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe
Subich, W4TV
Sent: Sunday, October 18, 2015 11:17 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Popping noise in headphones??


On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
> As a point of reference, my old K3 with the original synthesizer board 
> pops when changing BW. It's most noticeable going from 150 Hz to 100 
> Hz and vice versa.

There will be a slight pop when changing bandwidth between 150 and 100 Hz as
the K3/K3S disables the RXEQ at bandwidths less than 150 Hz.  The level of
the "pop" will be related to the amount of EQ in use *around* *the center of
the passband* (e.g., "pitch").  If for example, pitch is
500 Hz and bands 4 (400 Hz) and 5 (800 Hz) are 0, there will be little or no
"pop".  However, if one has 400/800 Hz set for significant boost there will
be a fairly loud "pop" as the level changes.

73,

    ... Joe, W4TV


On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
> As a point of reference, my old K3 with the original synthesizer board 
> pops when changing BW. It's most noticeable going from 150 Hz to 100 
> Hz and vice versa.
> This is with normal AF gain and CM500 in rear headphone jack.
>
> On 10/16/2015 6:01 PM, jim wrote:
>> I just got my K3 back from Elecraft.  They did the once over and 
>> installed the new SYN boards.
>>
>>
>> I have noticed a "popping" noise in the headphones as I change the 
>> bandwidth control, but ONLY as I transition from 200 Hz, 150 Hz, 100 
>> Hz and 50 Hz.  I have only checked this in the CW mode.
>>
>>
>> This popping noise was not there before sending the rig in.
>>
>>
>> I have the 500 Hz and 200 Hz crystal roofing filters installed, which 
>> is the same configuration as I had before sending it to Elecraft.
>>
>>
>> Any thoughts?
>>
>>
>> Tnx
>>
>>
>> Jim
>>
>> W6AIM
>>
>>
>
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