[Elecraft] KX3 atu anomalies - or it is me.

[luca de marinis]

Hi Don, yes I agree with you that if I measure the swr between the radio and the antenna I will have the same value I measured with the antenna analyzer.

The Automatic Tuner is installed and the mane ATU MD on AUTO

My point is: 

Why do I read ON THE KX3 swr GRAPH a peak value close to 2.0 when I transmit?

Why do I read the real SWR of the antenna - in my case 1.4 - when I hold XMIT to activate TUNE?

Thanks

Luca








On Sep 18, 2012, at 7:12 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Lucia,
> 
> You say that you had an SWR of 1.4, then used the ATU which lowered the 
> SWR to 1.0
> OK, That was on the KX3 display.
> 
> Please tell us where you were reading the continued 1.4 SWR.  The KX3 
> display does not show the SWR during transmit - only during a TUNE.
> The SWR shown externally to the KX2 ATU will not change, so if you are 
> using an external device, you will not see any  change in the SWR reading.
> 
> The KX3 ATU will reduce the SWR between the KX3 output PA and the input 
> to the KXATU3 to the value shown during on the KX3 display during a 
> TUNE, but the SWR between the KXATU3 and the antenna (as measured by an 
> external device) will not change.
> 
> 73,
> Don W3FPR
> 
> On 9/18/2012 8:14 PM, luca de marinis wrote:
>> Hi,
>> 
>> I completed my KX3 #1715 few days ago and today I went to the park and using a Buddipole I tried to make some contacts. Buddipole swr was 1.4 on 20m so I used the ATU. It worked fine lowered the swr to 1.0 but then I transmitted I still could read a 1.4 swr. I moved up and down the band and tuned again and every time the ATU started from 9.9 and did the all cycle. Sometime couldn't go lower than 1.4. Sometimes after tuning the power was reduced to 2W
>> 
>> Am I missing something. I did a search on the reflector but didn't show anything.
>> 
>> Thank you in advance for your help
>> 
>> 
> 
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