[Elecraft] my KPA1500 and 160M

[David Gilbert]

One distinct possibility is that the 4:1 balun is getting hot at 1500 
watts.  Have you tried running the KPA1500 at a lower power?

73,
Dave  AB7E



On 9/1/2020 9:36 AM, w5sum at comcast.net wrote:
> This morning I put up a W7FG true ladder line 160M doublet.   Upon 
> testing, the K3 internal atu does great, matches at 1.3:1.  But when I 
> throw the KAP1500 in line, it gets all pissed off, throws up and 
> faults out.  Says SWR is 99:1 !!!
>
> The Antenna:  The Apex is at 50'.  It is in a inverted Vee config, 
> with both ends approx 20' off the ground.   I'm using 59' of the 600 
> ohm true ladder line to a Balun Designs 5KW 4:1 Balun. This is fed 
> with 22' of Wilson LMR400
>
> Both the K3 internal atu, AND the KPA1500 internal atu get a great 
> match on 80M, 1.2:1   with no issues.
>
> Honestly, most of the work on 160M is FT8 running 20 watts or less, so 
> just using the K3 to get a successful match on 160M is fine
>
> I just wonder why the KAP1500 doesn't like the same antenna the K3 likes.
>
> Any ideas here fellers?
>
> thanks and 73
>
> 73 and GL OM DE w5sum