Elecraft

K2 40-Meter Transmitter Alignment

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edwin.ebert

K2 40-Meter Transmitter Alignment

Hello

My K2 is in the phase of alignment and Test, Part III.

In the transmitter alignment with 2, 5 or 10 watts I have the voltage and current similar to the manual (10 watts 11.5v and 1.98 amp).

Test Setup: 100w dummy and WM-2 Wattmeter from oak hills

Everything seems OK. Power and current remain stable during the tuning time (5-10 sec).

But then I have realized that I have differences in the reading of the power level before and after I push the TUNE Button.

E.g.: Power Set: 5 Watt then TUNE and the Display shows 6.3 Watt!

Problem: If I repeat this procedure 10 times I read different, but stable values between 4.8 and 7.1 Watt. The Wattmeter shows the same values as the display.

If the Power Setup is 10 watts the display can go to 13/14 Watt with a current that is higher as 2A (but not excessive), that means CAL CUR (2.5A) occur.

I think there is something wrong, but I didn’t found this behavior in the troubleshooting section.

Can you help me?

Many thanks

Edi, HB9BQJ

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Don Wilhelm-4

Re: K2 40-Meter Transmitter Alignment

Edi,

Nothing is wrong. The K2 does not control power as tightly during a TUNE
operation as during normal keying.

73,
Don W3FPR

edwin.ebert wrote:

>
> Hello
>
> My K2 is in the phase of alignment and Test, Part III.
>
> In the transmitter alignment with 2, 5 or 10 watts I have the voltage
> and current similar to the manual (10 watts 11.5v and 1.98 amp).
>
> Test Setup: 100w dummy and WM-2 Wattmeter from oak hills
>
> Everything seems OK. Power and current remain stable during the tuning
> time (5-10 sec).
>
> But then I have realized that I have differences in the reading of the
> power level before and after I push the TUNE Button.
>
> E.g.: Power Set: 5 Watt then TUNE and the Display shows 6.3 Watt!
>
> Problem: If I repeat this procedure 10 times I read different, but
> stable values between 4.8 and 7.1 Watt. The Wattmeter shows the same
> values as the display.
>
> If the Power Setup is 10 watts the display can go to 13/14 Watt with a
> current that is higher as 2A (but not excessive), that means CAL CUR
> (2.5A) occur.
>
> I think there is something wrong, but I didn’t found this behavior in
> the troubleshooting section.
>
> Can you help me?
>
> Many thanks
>
> Edi, HB9BQJ
>
>