[Elecraft] KPA1500 RFI on 12m

[Dave]

I have similar weirdness on 60 meters using the tuner in the radio with the amp in standby and amp tuner bypassed.  The amp wattmeter shows 276 watts reflected and the amp tuner keeps trying to automatically engage. 

Something in the amp logic will not allow it to be in pass through but after the radio tuner. I have to have the amp off when running 60 meters. Not a big deal but there is something weird with the SWR detection in the KPA1500 which allows it to take the amp tuner out of bypass. 

Dave wo2x



Sent from my waxed string and tin cans. 

> On Oct 24, 2019, at 4:26 PM, Michael Walker <va3mw at portcredit.net> wrote:
> 
> Hi Eric
> 
> I think you are asking a lot for a tuner to run at any power into a
> non-resonant antenna and break a pile up.  :)
> 
> You would actually have better success with a 12M dipole then trying to get
> a non-resonant beam to direct your signal.
> 
> If I was in your shoes, I would quickly toss up a 12M dipole with some
> string and bubble gum as you would have a much higher radiated signal.
> 
> Mike va3mw
> 
> 
>> On Thu, Oct 24, 2019 at 4:08 PM eric norris via Elecraft <
>> elecraft at mailman.qth.net> 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
>> 
>> Sent from Yahoo Mail on Android
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