[Elecraft] KPA1500 with P3 Transmit Monitor

[Bob McGraw K4TAX]

Nah, I read it wrong. 

Bob, K4TAX


Sent from my iPhone

> On Nov 2, 2017, at 1:25 PM, Gordon LaPoint <gordon.lapoint at gmail.com> wrote:
> 
> I must be missing something here.   I don't see where the original poster had anything to do with a tuner between the K3 and the KPA1500.   He wanted to hook his P3 TX monitor input to the output of the KPA1500 amp, before the amp tuner.  Or maybe I misunderstood the original post.
> Gordon - N1MGO
> 
>> On 11/02/2017 02:20 PM, Bob McGraw K4TAX wrote:
>> 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  Seems that hams today choose to believe and practice old and outdated methodology {largely because someone said so}  as opposed to learning and using current and correct methods.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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>> 
>> 
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> 
> 
> -- 
> Gordon - N1MGO
> 
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