[Elecraft] KAT500 SWR LED Doesn't Light with 1.0/1 SWR

[Bob McGraw K4TAX]

Yes I have that combination, KPA500 / KAT500.  Over the years I've learned that a VSWR of 1.5:1 or less means little to nothing.   Oh it's "comforting" to operate all the time with a 1.1:1 SWR but just accurate is that indication?  And the fact the two devices show different values lends credence to " just how accurate is that indication".  Plus many diode detection methods are least accurate at lower levels. 

Conclusion: find something more interesting to worry about. 

Bob, K4TAX


Sent from my iPhone

> On Apr 6, 2019, at 1:01 PM, wmbrian <bdeuby at gmail.com> wrote:
> 
> I recently added the KAT500 and KPA500 to my K3 station. 
> 
> I have noticed that when the SWR (after tuning)  as displayed on the KPA500
> is 1.0/1  (or occasionally 1.1/1) no SWR LED lights up on the KAT500. (The
> green 1.0/1 SWR LED on the KPA500 does light up.)
> 
> I have assumed that the 1.2/1 KAT500 SWR LED does not light up is because 1)
> the KAT500  threshold for the first SWR LED is 1.2/1 and 2) because no
> tuning action has taken place in these circumstances (due to memorized
> KAT500 tuning configuration).  However, I noticed at the bottom of page 49
> of Fred Cady's book on the KAT500 and the KPA500 it says "VSWR is displayed
> even when the tuner is bypasssed". So, I'm confused. Does no SWR LED light
> when the SWR is 1.0/1 (or very close to it) because the SWR is below 1.2/1?
> 
> Thanks,
> 
> Brian, K8GRR
> 
> 
> 
> --
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