Re: [Hamlib-developer] K3 SWR > 2.5 at the end of every transmission.

[Uwe, D. <dg...@gm...>]

Dear Hamlib developers,

AnewupdateforWSJT-XImproved3.1.0isscheduledtobereleasedinaweekortwo. It 
will bring some significant improvements (e.g. full support of WAS or 
similar awards, and further improvements to the FT4, FT2 and FT8 
decoders). IwouldliketouseHamlib4.7.1forthis, asitpromises to better 
supportthePWRandSWRfeatureforseveralwidelyusedElecraftrigs. 
Itrulyappreciateandcommendyoureffortsinthisregard, 
andI’mkeepingmyfingerscrossedthattheremainingissueswillberesolved!

However, thisraisesthefollowingquestionsformeatthemoment:
1. 
Doyouthinkyou'llbeabletoresolvetheremainingissuesregardingPWRandSWRbythen?
2. WhendoyouplantoreleasetheofficialHamlib 4.7.1version(not -rc)?
3. IftheissuesregardingSWRsummarizedbyW2YF(see below) cannotberesolved, 
after all, whatwouldyourecommend? ShouldIthen 
stickwithHamlib4.7.0justtobeonthesafeside? 
Orarethereanyotherimportantfixesorimprovementsinversion4.7.1?

Thanks!

73 de DG2YCB,
Uwe
________________________________________
German Amateur Radio Station DG2YCB
Dr. Uwe Risse
eMail: dg...@gm...
Info: www.qrz.com/db/DG2YCB


Am 08.04.2026 um 02:15 schrieb w2yf:
>
> When using 4.7.1 with WSJT-X-improved and turning on the Rig data 
> options of Pwr/SWR along with the stop transmit if SWR is > 2.5, every 
> single transmit ends with an SWR over 2.5 (reports a 20.9:1 !!!).
>
> This occurs on an antenna which is a 1.1:1 match, and a dummy load 
> which is 1:1.
>
> The radio does not report high SWR, as a matter of fact its bar graph 
> doesn't budge above the perfect match. I inquired on the Elecraft 
> group and they said that when the power envelope is rapidly dropping 
> (end of xmit) the calculated SWR values are suspect because of the way 
> the algorithm deals with the dropping power measurement.
>
> The KX2 and KX3 also exhibit this behavior... the K4 as of yet has not...
>
> The group thinks the only fix is if hamlib deals with this as these 
> radios are old enough that the likelihood of any firmware fixes is nil.
>
> The problem is that the K3 says PTT is still enabled while it throws 
> these erroneous values, so it is almost as if multiple test would need 
> to be performed to ascertain that the SWR is really what it says it 
> is... a sort of 3 strikes and your out test (ugly).
>
> So, first question, does anyone else see this with 4.7.1, both rig 
> data options enabled with a KX2, KX3 and/or K3?
>
> Second question, is it worth addressing?
>
> Tom, W2YF
>
>
>
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