[CQ-Contest] Elecraft KPA 1500 vs.OM 2000A

[N4ZR]

There is a raft of interrelated parameters that can be set in the 
KPA-1500 firmware on a per-band basis, relating to the allowable SWR.  
The KPA-1500 manual is of limited help on these, and much more 
explanation of how they interact, in particular, would be welcome.  But 
from my experience, when my KPA-1500 faults, it is almost always with 
the indication that a limit on reflected power has been exceeded.

Training of the ATU is absolutely required, particularly on 40 and below.

73, Pete N4ZR
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On 3/5/2020 10:50 AM, Dan wrote:
> I agree with Jim's comment. My KPA 1500 does not fold back until I 
> reach close to 3 to 1. I rarely use the tuner and my CC 2L 40 will 
> cover the whole band without using a tuner. I would imagine that 
> certain combinations of impedance and reactance might have an effect 
> on the fold back. The other elephant in the room is SWR being read on 
> meters is not always what it seems. My Daiwa, KPA 1500 and K3 (running 
> bare foot so not into amp input) can all have different SWR readings 
> on the same frequency.
>
> Dan W8CAR
>
>
> -----Original Message----- From: Alan M. Eshleman
> Sent: Wednesday, March 4, 2020 12:48 PM
> To: k9yc at arrl.net
> Cc: cq-contest
> Subject: Re: [CQ-Contest] Elecraft KPA 1500 vs.OM 2000A
>
> that's been my experience with my KPA1500...
> ----- Original Message -----
> From: Jim Brown <k9yc at audiosystemsgroup.com>
> To: cq-contest <cq-contest at contesting.com>
> Sent: Tue, 03 Mar 2020 17:57:05 -0800 (PST)
> Subject: Re: [CQ-Contest] Elecraft KPA 1500 vs.OM 2000A
>
> On 3/3/2020 10:13 AM, Edward Sawyer wrote:
>> super SWR sensitive doesn’t sound like good characteristics for an amp.
>
> I have NOT experienced SWR sensitivity with reasonable antennas that the
> KPA1500's built-in tuner can't handle. I suspect someone having this
> problem has not RTFM, which describes how to train the tuner for each
> antenna for each band, or has not taken the time to do it.
>
> The KPA1500 can memorize settings for three different antennas for each
> band for each of the two antenna ports.
>
> And I DO get pretty close to 1.5kW on 6M.
>
> 73, Jim K9YC
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