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

[Don Wilhelm]

Mike,

Yes, I would say that you have a significant difference there and it 
indicates a problem of one nature or another.
What mode?
How did you set up the IF filters?  Use Spectrogram.  Look at my website 
www.w3fpr.com article on K2 Dial Calibration - Part 3 deals with the 
filter setup.
The reason I suspect the filter is that the XFIL 1 is a wide filter, and 
if you did not offset the passband from zero frequency you will have the 
BFO energy appearing in the output and that will influence the S-meter 
response.

73,
Don W3FPR

On 6/2/2012 3:31 PM, VK1OO wrote:
> Don,
>
> Nice to hear from you again.
> I had a similar thought from Jim, W4ATK.
> I'm surprised the S-Meter is showing an additional 6 bars on X1. As 
> I'm listening to a quiet frequency I am assuming that's all additional 
> noise. Further that that is much more than seems justified by the 
> relatively difference in bandwidth.
>
> I'm happy to simplify the question to, Why would the S Meter be 
> showing that much difference?
>
> Mike
> VK1OO
>
> On 03-Jun-12 1:16 AM, Don Wilhelm wrote:
>> Mike,
>>
>> I can't tell from your post just how much increase in noise you are 
>> hearing.
>> There will be an increase in the total noise heard just because the 
>> bandwidth is increased - you will hear the total noise in the 
>> passband, and when the passband is widened, the total noise will 
>> increase.
>>
>> OTOH, if the increase is extreme, that would indicate a problem.
>>
>> 73,
>> Don W3FPR
>>
>> On 6/2/2012 6:02 AM, VK1OO wrote:
>>> Hi,
>>>
>>> Another interesting problem with the K2.  I've noticed that when
>>> switching between the KSB2 filters, X1-X4, that there seems to be more
>>> background noise on X1. And there is a similar increase in S meter 
>>> bars.
>>> On a quiet frequency with X1 selected, the S meter shows S8; X2-X4 
>>> show S2.
>>> I'd certainly appreciate any suggestions about where to start
>>> troubleshooting this one.
>>>
>>>
>>
>