Posted by
Don Brown-4 on
Jul 16, 2004; 2:22pm
URL: http://elecraft.85.s1.nabble.com/K2-transmitter-alignment-need-help-tp368826p368829.html
HI
The DL1 is a 50 ohm load but the RF detector is connected across only 1/2 of the load. The detector is also a peak detector so you need to convert the peak voltage read on the meter to RMS. So the first thing is to double the read voltage because of the voltage divider on the DL1 then convert to RMS by multiplying by .707 then the V * V / 50 should work. The easiest method is to use the conversion chart that is in the DL1 manual. It is set up so you plug in the read DC voltage and you get the power out in watts.
Don Brown
----- Original Message -----
From: JEAN-FRANCOIS MENARD<mailto:
[hidden email]>
To:
[hidden email]<mailto:
[hidden email]>
Sent: Friday, July 16, 2004 7:57 AM
Subject: Re: [Elecraft] K2 transmitter alignment, need help
Thanks,
I now understand how the K2 react when tuning. But, I was suspecting
something, because I found that my power output seems to be more lower
that is suppose to be. Correct me if i'm wrong, but when I test the
output power, U use the DL1 dummy load, I set my K2, for example at
10W, and push the tune button. While I have my DMM meter set to DC
connected to the two tips on my dummy load, I read the vDC. After I
calculate V * V / 50 omhs, I also check that the dummy load I built is
effectively 50 ohm.
And the result are really lower that is suppose to be. Am I doing
something wrong, I guess ? ;-)
Thanks for your patience....
Le 04-07-16, à 01:40, Tom Hammond a écrit :
> Jean-Francois:
>
>> In alignment section 3, on page 75, the first step of the 40m
>> alignment, I can experiment something strange. Ajusting my power at
>> 2W like in manual, when I press the "TUNE" button and adjust L1 and
>> L2 for there maximum watt peak, I can see that after the ajusment, if
>> I press "TUNE" butto to test the alignment a few times, I can see
>> that the watt meter do not indicate always the same value each
>> time.... sometimes 1.9, sometimes 3.0...
>>
>> Am I missing something ???
>
> When you are in TUNE mode, the ALC does not activate. Therefore, while
> you are adjusting the various controls you CAN obtain more power
> output than the POWER setting is set for... for instance, if you have
> the POWER control set to 2W and you are adjusting the capacitors or
> inductors for max. power output, you may be able to obtain 3-4 W
> output. BUT, when you exit the TUNE mode and then go back to TUNE
> again, the ALC should then limit the power to 2W unless you make
> another adjustment to the C or L.
>
> This is normal action for the K2. In fact, when you are adjusting C
> and L for max. output, if you find that you are getting much higher
> power than you want to get at that point, just exit TUNE and re-enter
> it and the power will again be back at a lower value. Wen you exit
> TUNE and operate normally, the ALC will control max. power output
> based upon the POWER level you have selected.
>
> 73,
>
> Tom Hammond N0SS
>
===============================================
Jean-François Ménard / VA2VYZ
[hidden email]<mailto:
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Club d'Astronomie Amateur de Sherbrooke
Club Radio Amateur de l'Estrie
Mon site web personnel :
http://homepage.mac.com/jfmenard<
http://homepage.mac.com/jfmenard>
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