[Elecraft] KAT3 question

Ken Wagner K3IU kenk3iu at cox.net
Wed Apr 2 15:14:35 EST 2008


Wayne published something a while back that if you push the "tune" 
button very quickly after the first tuning stops, it will try again with 
another algorithm that might result in a lower tuned SWR.  This from the 
release notes for firmware 1.75.
" * ATU MATCHING Improved: If you tap ATU TUNE a second time on the same
    band/antenna within 5 seconds, a more extensive search is used that 
may result in a
    lower SWR. The original (fast) algorithm is unchanged. Further 
improvements are planned."

73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~

Rick Dettinger wrote:
> I have just installed the KAT3 and it seems to be working, however, i 
> can only get a SWR of 4.0 on the K3 on my 40M end fed antenna.  I know 
> the SWR with this antenna is very high, but I can get the SWR down to 
> 2.5 with my K2 ATU.  The K2 is using ALT tune to get there taking a 
> long time.  I can understand that this could be a matter of chance, 
> since the tuners use discrete components, rather than adjustable 
> ones.  I don't find much info on the KAT3 in the Installation 
> Instructions or the K3 Owner's Manual.  Sheet 3 of the KAT3 
> Installation Manual, Introduction, says "Complete details for using 
> the KAT3 are included in the KXV3 Owner's manual."  I can't find a 
> KXV3 Owner's Manual on the Elecraft site, only the Installation 
> Instructions and I don't have a KXV3.  Do I need a KXV3 to use my 
> KAT3?  Does the KAT3 have the equivalent of ALT tune on the K2?  The 
> KAT3 seems to give up after a few seconds, while the K2 tries real 
> hard to get a good match.  I can prune my end fed antenna but I may be 
> missing something here and would like to know.
>
> Thanks and 73
> Rick Dettinger
> K7MW
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