[Elecraft] K2 TX alignment problems continue

Neal Campbell and Sarah Ferrell k3nc at arrl.net
Sun Feb 13 22:16:05 EST 2005


I have retested and the output as shown on the k2 tracks more closely 
with the watt meter. On 40m with the k2 showing 10 watts, I am seeing 
2.6 amps.

When I push it to the maximum, it shows between 14 and 16 watts 
depending on the band.

I have set cal cur to 3.25amps. When I crank it to full output, after 
abt 10 seconds I see the mpu reset (drops out of xmit and the elecraft 
name appears in the lcd). Is this a sign of trouble or some safety 
logic to keep it out of 'full carrier' mode for long?

I have aligned all the bands per the procedure and it acted normally 
(peaking a decent amount based on the can/capacitor.

73 Neal
On Feb 13, 2005, at 9:07 PM, Neal Campbell and Sarah Ferrell wrote:

> The good news is that I did a diode dance, had the rf probe diode in 
> D9, had the real d9 substituted for a 4148 and a 4148 in the rf probe.
>
> Will swap them around and redo the tests!
>
> Neal
>
> On Feb 13, 2005, at 6:00 PM, Vic Rosenthal wrote:
>
>> Neal Campbell and Sarah Ferrell wrote:
>>
>>> The symptom of my problem is:
>>> 1. when setting k2 power to 5 watts, I get a reading of 2.2 amps 
>>> with abt 0.8v drop
>>> 2. when looking at power output with an external wattmeter, 5 watts 
>>> reflecting on the external wattmeter shows as 3.8 on the k2. 
>>> Similarly, 10 watts on external wattmeter is reading 6.9 on the k2 
>>> at an 2.8 amps. Cranking the rf power all the way clockwise shows 15 
>>> watts on k2 and hi pwr message (cal curr set to 3.25) and external 
>>> wattmeter shows 19 watts.
>>
>> The RF detector seems to be reading low.  Check the RF detector 
>> components on the RF board: R66, R67, R68, R69, D9.  Make sure the 
>> resistors are the correct values and the diode is the correct type.
>>
>> -- 
>> 73,
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco
>>
>
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