[Elecraft] some questions of W1

[Siu Johnny]

Hi Group,

Christmas does give me some spare time to construct the serial cable to 
link the W1 with my notebook computer.

I run W1, K2 with DL1 dummy load.  I notice that the power reading of W1 on 
my notebook computer is higher than that calculated from the DC voltage 
measured on DL1.  For example, I got a power indication of 15 watts from W1 
through my note book.  At the same time, the voltage across TP1 of the DL1 
dummy load is 18.2 watts.  Based on the power formula of DL1, the 
calculated power output should be 13.4 watts.

Without changing any settings of my K2, I used LP100 instead of the W1 this 
time.  I obtained a power reading of 13.5 watts on the LP100.  Apparently, 
the reading from the LP100 is very very close to the power calculated from 
the DL1.

The calibration of W1 was turning the CAL trimmer for 4.5VDC at TP1 before 
this test.  If I want to have a reading from W1 to match the DL1 
calculation or LP100, I have to readjust the CAL trimmer of W1 to arrive a 
reading of 4.82VDC at TP1.

My questions are:

1.  What is the basis of the 4.5VDC as suggested in P.10 of the W1 
construction manual?
2.  Is the power calculated from the DL1 more accurate than the reading of 
W1 based on the calibration mentioned in above?
3.  Since the power calculation from the DL1 is very closed to the reading 
in LP100, should I turn the CAL trimmer in W1 to match with LP100?

Could any of you give me some help?  Christmas time is the quiet time for 
me to do some radio experiments.

TNX & 73

Johnny Siu VR2XMC

_________________________________________________________________
ÓëÁª»úµÄÅóÓѽøÐн»Á÷£¬ÇëʹÓà  Live Messenger; 
http://get.live.com/messenger/overview