[Elecraft] Help - K2 Higher Noise Level with X1 Selected

[VK1OO]

Hi Don,

We have a long weekend here, so I've been able to get back to this.
I reflowed RF board and KSB2 board, with no improvement.

I then took out the KSB2, inserting the previously removed links and the 
capacitor (effectively returning radio to pre-KSB2 state).  The noise 
problem on X1 goes away.

Your thoughts on what to look at next would be appreciated.

Mike
VK1OO


On 03-Jun-12 6:59 AM, Don Wilhelm wrote:
> Mike,
>
> If you do not find the solution re-flowing the solder on the RF board 
> filter area, the problem source may be on the KSB2 board in the 
> switching diodes and/or resistors at the filter end of that board, so 
> for completeness, reflow those connections as well.
>
> 73,
> Don W3FPR
>
> On 6/2/2012 4:24 PM, VK1OO wrote:
>> Don,
>>
>> The effect happens when the antenna is disconnected as well as when
>> connected.
>> And in SBB and CW
>>
>> SSB Filter Widths
>> X1 = OP1
>> X2 = 2.4
>> X3 = 2.1
>> X4 = 1.8
>>
>> CW Filter Widths
>> X1 = OP1
>> X2 = 0.7
>> X3 = 0.4
>> X4 = 0.1
>>
>> I assume something is going wrong in the 4.915MHz Variable Bandwidth
>> Crystal Filter.
>>
>>
>