[Elecraft] K2 alignment and test part 2

[Don Wilhelm]

Mike,

The best use of the 'scope is during the transmit bandpass filter 
alignment - just connect the 'scope (with a 10X probe) across your dummy 
load, and use it to indicate the RF amplitude - that is faster then 
looking at the slower to change display on the K2.
If you have the KAT2 option (or the KPA100), you can use the 'scope 
amplitude reading to calibrate the wattmeter for forward power.  Use the 
peak to peak voltage and square it, then divide by 400 to give you the 
power (assuming your dummy load is a good one at 50 ohms pure resistive).

Other than that, you will not have to use the 'scope much at all -- of 
course if you need to do some signal tracing, it is the best tool to 
use.  Hint for that, multiply the 'Expected' RF voltages in the manual 
by 2.8 to give the expected peak to peak voltage.

As far as frequency calibration, I would not believe the frequency 
counter in a 'scope would be sufficiently accurate for doing the dial 
calibration.  You may want to defer the dial calibration until the last 
step after you have Part III done and then look at the K2 Dial 
Calibration article on my website www.w3fpr.com to set the 4 MHz 
reference accurately and achieve good dial calibration.

For the filter alignment, use the information in part 3 of the dial 
calibration article for use of Spectrogram to get the best results.
If you do not have a good copy of Spectrogram, look for the download 
links on my home page - near the bottom.

The XG3 is excellent for setting the S-meter HI reading (CAL S HI)
Yes, you can use it when doing the receive bandpass filter alignment.

The K2 is designed to use minimal external equipment for the alignment 
and calibration.  Most of the essential tools are built into the K2, and 
they work very well.

73,
Don W3FPR
On 8/4/2013 3:35 PM, Mike Weir wrote:
> In my K2 build I am approaching the alignment and test part 2 stage. I
> have the Rigol DS1052E scope (software upgraded to 100mhz) I would like
> to use the scope on my K2 build. I do know there is spectrogram, and
> features on the K2 that I can use BUT I would like to use the scope as
> well.
> I was wondering the following?
> 1. Can I use the scope when asked to use a frequency counter?
> 2. Can I use the scope to measure the voltages that are asked to be measured in the alignment checkouts?
> So
>   for 4 mhz oscillator calibration, PLL Reff oscillator range test, VCO
> test, VCO alignment and so on can the Rigol scope be used in these and
> other procedures?
>
> I was also wondering I have the XG3 as well and
>   could I use that in 40m band pass filter alignment and what else could
> the XG3 be used for in the K2 build?
>
> Thanks very much for time.
> Mike
> VE3WDM 		 	   		
>