Re: SWR safe levels question

Posted by KD8NNU on Aug 28, 2011; 10:53pm
URL: http://elecraft.85.s1.nabble.com/SWR-safe-levels-question-tp6734646p6735866.html

Thanks Bob,

This was the kind of information that I was looking for.

I am not haveing problems per say, I just wanted to know how good is
good or how closes is close.

When I get it close on the MFJ and then go to check with power, I desire
to have the meter on the tuner match the K3.  My goal is to get the
reflected power needle to be at zero if possible and also have the k3 at
1.1

Now with this information if the k3 is a little different I suspect it
is due to the antenna switch and the extra coax.

Thx
Don

~73
Don
KD8NNU


On Sun, Aug 28, 2011 at 1:37 PM, Bob Cunnings wrote:

> If you're looking for a documented level, here's the change note
> describing the SWR power rollback feature when it was introduced (MCU
> 1.87 / DSP 1.69 on 5-3-08):
>
>   * POWER ROLLBACK BASED ON REFLECTED POWER:  Power rollback begins at
> about
>     2.5:1 at 100 W (and of course much higher SWRs are tolerated at
> lower power settings).
>     Recovers to original target power level after mismatch is
> corrected.
>
> When making antenna tuner adjustments I adopt the usual convention for
> solid state finals: keep the SWR below 2:1. In the case of the K3 that
> apparently puts me well below the foldback threshold at 100 W so I'm
> content. It's the SWR indication on the K3 that I care about since
> that's what's driving the K3's foldback feature.
>
> Bob NW8L
>
>> I have been searching for the "safe" swr level for the k3.
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