[Elecraft] K3Utility - Mac RF Calibration

[Don Wilhelm]

Grant,

The compensation between 'nor' and 'abs' is done in software, so it may 
be that something you did in the calibrations has thrown it off a bit - 
it is not hard to re-do both the RF gain and S-meter calibrations, so I 
would do them both (in that order).

73,
Don W3FPR

Grant Youngman wrote:
> Don ..
>
> I realized that as I was redoing the adjustments one more time -- no  
> separate S-meter adjustments for the Sub.    I'll start from scratch.
>
> But the results do seem a bit odd.   As it now sits on the Main (and  
> this is after mistakenly tweaking S_meter cal on the Sub), a 50uV  
> signal yields an S-7 with preamp off and S-9 with preamp on, with the  
> meter in Nor mode.  In Abs mode, I see S-7 with preamp off and S-6  
> with preamp ON.
>
> It's certainly possible (most likely?) that there's a cockpit problem  
> here, but the results I'm getting don't look right.  Prior to all of  
> this, there was no change in S-meter reading when activating the  
> preamp in "abs" mode.
>
> Grant/NQ5T
>
>
> On Nov 4, 2009, at 3:58 PM, Don Wilhelm wrote:
>
>   
>> Grant,
>>
>> Re-do the S-meter Cal on the main receiver.  There seems to be some  
>> confusion on this topic, but there is only *one* set of S-meter  
>> calibration settings (at least that is the way it is right now).  So  
>> when you thought you were calibrating the subRX S-meter, you likely  
>> messed up the settings for both the main RX and the sub - I can't  
>> say for certain but I think it has something to do with the 3 dB pad  
>> and athe variety of ways to connect the subRX antenna..
>>
>> 73,
>> Don W3FPR
>>
>> Grant Youngman wrote:
>>     
>>> Did we ever ever get anything final on the "subtle bug" that may  
>>> have  created a problem with RF Gain calibration in the Mac version  
>>> of K3  Utility?
>>>
>>> I used the new test version sent out a few days ago, calibrated to  
>>> an  XG2 on 20M.  Didn't have to adjust S-Meter cal on the Main  
>>> receiver,  but did cal the Sub S-Meter, which I'd ignored up until  
>>> now.  All  seemed well, until I powered on the K3 today, and  
>>> noticed what seemed  to be "scotch" S-Meter readings.  A recheck  
>>> with the XG-2 shows only  about S-7 with the 50uV test signal.
>>>
>>> Grant/NQ5T
>>>
>>>       
>
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