[Elecraft] K3Utility - Mac RF Calibration

[Grant Youngman]

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
>>