[Elecraft] Antennas and Output Power - KPA-1500

[N4ZR]

Thanks, Dick.  That video squares with what I've been doing, but it 
doesn't address my original question, which is:

When I have set the drive to give me ~1450 watts on the Carolina Windom, 
and I need to switch to the sloper on the same frequency, I find that 
the drive level that produced this output on is too high, resulting in 
excessive output power - well over the legal limit.  To get legal again, 
I have to manually turn down the output power on my K3.  If I then 
switch back to the Windom, I'm suddenly only running ~1000 watts out.  
Is there any way to have the drive level not only set band by band, but 
antenna by antenna?  K6XX's video seems to demonstrate 6 widely 
different antennas with very different matching solutions required, all 
producing the same power output for the same drive (unless, of course, 
the K4 is better in this respect).

73, Pete N4ZR
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On 10/15/2020 8:19 PM, Dick Dievendorff wrote:
> It's demonstrated around the last third of this K6XX video, where K6XX shows
> matches on antennas on the same frequency.
>
> 73 de Dick, K6KR
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
> Behalf Of john at kk9a.com
> Sent: Thursday, October 15, 2020 17:07
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Antennas and Output Power - KPA-1500
>
> Do you use both antennas on the same frequency?  I do not have a KPA1500 but
> I am curious how the tuner can remember the two different settings and know
> which trained setting to use when you switch antennas. (assuming that you're
> not also changing frequency).
>
> John KK9A
>
> N4ZR wrote:
>
> I have two antennas for 40M, a Carolina Windom and a full-wave parasitic
> sloper, the latter fed through a 4:1 balun.  The 1500's tuner handles both
> antennas nicely, and I have trained it on both of them, but when I switch
> from the Windom to the sloper (on an external antenna switch), the output
> power changes from ~1400 watts to nearly 1700, often triggering a high
> current fault.
>
> --
> 73, Pete N4ZR
>
>
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