[Elecraft] KPA1500 with P3 Transmit Monitor

[Bob McGraw K4TAX]

Most authorities I read and follow strongly suggest one NOT use a tuner 
between the radio and the amp.

This "old wives tail" goes back to the time many to most early tube type 
grounded grid amps did not have a tuned input.  Seems that hams today 
choose to believe and practice old and outdated methodology {largely 
because someone said so}  as opposed to learning and using current and 
correct methods.

73

Bob, K4TAX



On 11/2/2017 1:14 PM, RIchard Williams via Elecraft wrote:
> James,
> Am not sure why you need a tuner between the radio and the amp in the first place??  As of now, I have my K3S or K3 driving a Alpha 9500.  I never have used the tuner in either when driving the amp?  I assume the KPA9500 will have a 52 ohm input, and you would not need a tuner.
> Dick, K8ZTT
>
>        From: James Wilson <w4rks73 at gmail.com>
>   To: Elecraft <elecraft at mailman.qth.net>
>   Sent: Thursday, November 2, 2017 11:54 AM
>   Subject: [Elecraft] KPA1500 with P3 Transmit Monitor
>     
> Looking at a draft of the KPA1500 amplifier, it appears
> that the only place to install  a TxMon or Wattmeter coupler
> is at the  -  output  -  of the built-in tuner.
>
> At that point, it will always show the SWR of the
> coax feedline, not the SWR that the amplifier "sees" as
> adjusted by the built-in tuner.
>
> Or, is there a coupler built-in inside the KPA1500 ?
>
> What am I missing?
>
> Jim - W4RKS
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