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

[Bob McGraw K4TAX]

The SWR LED scaling on the KPA500 is different than the scaling on the KAT500.  Yet the KPA500 does have a numerical readout......if one wishes to split hairs. 1.0, 1.1, 1.2, 1.3 and etc. 

With LED type displays, there is always a "transition" point from one value / LED to the next.  It could be at 1.4, or 1.5 or 1.6. Thus a value of 1.4 on one device could be 1.6 on another.  


Bob, K4TAX


Sent from my iPhone

> On Apr 6, 2019, at 3:13 PM, Bill Johnson <k9yeq at live.com> wrote:
> 
> Does the power output LEDs give a reading?  If they do and you show no reflected that should be ok.  If you have a bride after that it may show no lite either.  You can always bypass the KPA's and find a frequency where you see 2:1 then turn the KPA's back on and see if that gives a reading.  If not, suggest you call tech support.
> 
> 72 & 73,
> Bill
> K9YEQ
> FT'er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc. 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of wmbrian
> Sent: Saturday, April 6, 2019 1:02 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KAT500 SWR LED Doesn't Light with 1.0/1 SWR
> 
> 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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