[Elecraft] K3 Popping noise in headphones??

[Vic Rosenthal 4X6GP/K2VCO]

Well, I have an old K3 plus new synths, I have the RX EQ set to zero dB 
all across its range, and I hear the noises. I would call them short 
tone bursts rather than pops, though.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 18 Oct 2015 21:16, Joe Subich, W4TV wrote:
>
> 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