[Elecraft] [KPA500] K3S/KPA500/KAT500 - Adjusting TX Power

[Bob McGraw K4TAX]

I wholly agree.  Every tuner placed in line has loss, two have twice or 
more the loss.  I rather deal with a bit of SWR.  The loss in the line 
due to any  amount of SWR on the line does not change with the use of a 
tuner.

Of course the tuner makes the radio and its operator seem more satisfied 
then all is well.  Match the line to the load and don't worry about it.

73

Bob, K4TAX



On 9/4/2017 11:36 AM, David Bunte wrote:
> Bret -
>
> W6FB - Jack, was spot on with his information regarding the differing
> readings... but I have an added question. If your SGC-235 gives an
> acceptable match, then why use the KAT500 at all? I think that it is seldom
> a good idea to use two antenna tuners in series... at least that has been
> my thinking for the past 60 years. Am I missing something.
>
> I have a K3, P3, KPA500 & KAT500... but also have a hi power remote tuner
> at the base of my vertical. My KAT500 is bypassed, UNLESS I have a failure
> in my remote tuner, in which case I can bypass it, and quickly switch to
> the KAT500.
>
> If there is a compelling reason to run both tuners I could try that, but
> thought that was ill advised.
>
>
> Very 73 de Dave - K9FN
>
>
>
> On Mon, Sep 4, 2017 at 8:06 AM, MaverickNH <cbjesseeNH at comcast.net> wrote:
>
>> I'm learning about a new KPA500/KAT500 installed with my K3S. When I have
>> the
>> K3S power knob set, in this case, to show 420-440W peak-hold as read on the
>> KPA500 LED screen, I see the KPA500 SWR showing 1-3 LEDs lit (it may stay
>> at
>> 1 LED or climb from 1 to 3 LEDs over 15sec TX, always below 1.5), the
>> KAT500
>> with SWR 1.2 LED lit, and P3TXMON indicating SWR 1.00 (it might start at
>> 1.15 and settle back to 1.00 over 15sec TX). But PEP on the P3TXMON can
>> range from 10-15W up to ~400W on successive 15sec periods of TX using
>> WSJT-X
>> FT8 (going for very distant CQs). Adjusting the K3S power knob down may
>> bring P3TXMON displayed power up if its 10-15W. If the P3TXMON shows 200W
>> adjusting the K3S power knob up may bring the P3TXMON power shown down.
>>
>> Is that how it's supposed to work?
>>
>> I have a P3TXMON 2000W 1.8-54MHz unit installed on my feedline at the rig
>> as
>> follows:  KAT500 to Common Mode Choke to P3TXMON to Bias-T to SG-235 remote
>> ATU at antenna base to 43ft Vertical antenna, with some Lightning GDTs
>> between at antenna base and home feedline entrance. My tuning practice is
>> to
>> change Frequency, turn KAT500 to BYP, tune the remote ATU, then set KAT500
>> to AUTO and let it adjust on 1st TX.
>>
>> Bret/N4SRN
>>
>>
>>
>> --
>> Sent from: http://elecraft.365791.n2.nabble.com/
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