[Elecraft] KPA1500 RFI on 12m

eric norris gliderboy1955 at yahoo.com
Thu Oct 24 16:08:14 EDT 2019


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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