[Elecraft] KPA1500 RFI on 12m

[Dave]

I had a C3SS. From what I remember the amp tuner should be able to handle the SWR. I think the pattern on 12 was 180 degrees from normal heading.

Dave wo2x

Sent from my iPad

> On Oct 24, 2019, at 9:58 PM, john at kk9a.com wrote:
> 
> I have a C3 that I brought to St Croix and operated as WP2AA. It has no 12m
> elements however the manual states it will work on 12m with a tuner although
> I am not sure what the pattern would be. I am not a fan of using out of
> resonant antennas and do not even have a tuner in any of my K3S's. I wonder
> what the C3 SWR is on 12? The KPA1500 specs are for a maximum SWR of 3:1,
> perhaps an external tuner is needed?
> 
> John KK9A
> 
> 
> 
> eric norris WD6DBM wrote:
> 
> My Force 12 C3 antenna is not resonant on 12m.  Using the K3 barefoot, the
> internal atu tunes the antenna fine.  Bypassing the K3 atu, but still
> running barefoot into the KPA1500 atu, the KPA atu loses it's mind and goes
> in and out of TUNE mode uncommanded.  Even though the KPA has found a match,
> trying to transmit through it at the 100w level is impossible because of the
> constant retuning.
> I have put my small collection of mix-31 ferrites on the antenna output,
> input, and KPA control line at the KPA, each at a time, with no success.
> Any ideas?  I would like to be able to run the KPA at least a few hundred
> watts to have the proverbial snowball's chance to break the VP6R pileup on
> 12m CW.
> Any useful comments appreciated.
> 73 Eric WD6DBM
> 
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