[Elecraft] KPA-1500 ATU not working well

[K9MA]

Dick,

Have you tried manually adjusting the ATU?  I haven't used mine on 6 
meters, but on other bands, no matter what I do, it sometimes doesn't 
get a very good match automatically, and I can do better manually.  On 
the other hand, it may be that the L and C step sizes are just too big 
to get a good match on 6. Or there could actually be something wrong. If 
you have a good 50 MHz dummy load, try that with the ATU in.

73,
Scott K9MA


On 6/21/2018 22:40, Dick via Elecraft wrote:
> I'm wondering if anyone else is having problems with their KPA-1500 ATU on 6-meters?  My antenna is cut for 50.100 and has a 2.2:1 SWR at the 50.313 FT-8 frequency.  The very best the ATU will do is to lower the SWR from 2.2:1 down to 2.0:1 which is almost no improvement.  The 2.0 to 1 is with exciter power, when I switch the KPA-1500 to operate and transmit at 1,200 watts the SWR increases to aprx. 2.2 to 1 and the KPA-1500 will fault and trip off occassionally.  Hoping there's a fix for this.
>   
> I'm using the latest KPA-1500 firmware.
>   
> Thanks,
> Dick- K9OM
>   
>   
>
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-- 
Scott  K9MA

k9ma at sdellington.us