I am watching this with great interest. If running stations on CW my
KPA500 shows low-mid 50sC and I have never known what it should be. Thanks
> If the initial VSWR is really measuring 1.00:1 with low power, that
> means the detected reflected power is exceptionally low. I'm sure the
> algorithm used to compute SWR sets it to 1:1 if there's zero reflected
> power. If the load is not really perfectly flat, as the incident power
> is increased the detector will finally see enough reflected energy to
> give an indication. You have absolutely nothing to worry about in your
> system.
>
> 73...
> Randy, W8FN
>
>
> On 4/10/2020 9:59 AM, Lyn Norstad wrote:
> > At 100w on 20m, my KAT500 Utility shows an SWR of 1.00 with the KPA500 on
> > Standby and temp around 38ºC. But as I switch the KPA to Operate and
> > increase the power to 300w the SWR goes up as high as 1.10. If I hold it
> > there (key down) long enough the KPA temp starts rising slowly. At about
> > 50ºC I can hear the fan picking up speed. By the time I get to 60ºC the
> fan
> > is at probably level 2 or 3. SWR is still at 1.10 (max).
> > Right or wrong, I've always assumed there is some slight heating in the
> > antenna system (Tuner, Balun, Lightning protection) although all
> components
> > after the tuner are rated at 5 KW.
> > 73
> > Lyn, WØLEN
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