[Elecraft] KX3 SWR meter accuracy on 50 MHz?

[Nr4c]

Well, it depends on the “Dummy” load.  Have you swept the load with a good spectrum analyzer or VNA?  It may not be 50 ohms at 50 MHz



Sent from my iPhone
...nr4c. bill


> On Sep 12, 2020, at 11:51 AM, Drew Arnett <arnett.drew at gmail.com> wrote:
> 
> After getting my KX3 back from repair (before my next planned contest
> operation, thanks!), I ran some measurements to both see how great the
> repairs were and to get a new baseline for future measurements.  TX
> efficiency problem was gone.
> 
> However, I'm left to wonder about the accuracy of the internal SWR
> meter for 50 MHz.  Using a microwave dummy load of adequate power
> rating and just a coaxial adapter, I measured the following:
> 
> 14 MHz @ 1 W setting
> VSWR 1.0 to 1 (per KX3)
> 
> 28 MHz @ 1 W setting
> VSWR 1.0 to 1
> 
> 50 MHz @ 1 W setting
> VSWR 1.5 to 1
> 
> 50 MHz @ 4 W setting
> VSWR 1.6 to 1
> 
> Not horrible.  Not great.
> 
> It's fine if it's not as accurate on 50 MHz.  I just want to know if
> this is normal.  Has anyone else looked at that and can share what
> they see?
> 
> Thanks and best regards,
> 
> Drew
> n7da
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to nr4c at widomaker.com