I agree that the KAT3(a) can run 100 watts for quite a while. I have run
100 watts in RTTY contests with both of my K3S(s) without issue. I have
never used FT8, I am sure that my RTTY transmissions are shorter than a 13
second FT8 transmission however the non-transmit time in-between RTTY
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The answer is in the results of simple questions:
Who, if any, has had their KAT3 fail and for what cause? What was
actual (r,x,c) antenna load, that was being attempted?
I suspect the failures are low, it's smart enough to quit trying if the
match is too extreme. The same components
I am reasonably certain that the KAT3 can handle 100 watts for a lengthy
period to time (enough for normal FT8 purposes) if the SWR it is trying
to match is low enough. But the original query didn't say how high an
SWR he was trying to match. The KAT3 is certainly capable of matching
some
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I have frequently used my K3 at 100 watts with FT8 and RTTY. I haven’t had
anything which would indicate that components are getting overstressed (e.g.
bad smells).
Now, I don’t think I have given a full 100 watts when something isn’t connected
in the antenna system, although the KAT3 does
e:
Message: 17 Date: Wed, 11 Oct 2023 21:40:19 -0700 From: David Gilbert
To: elecraft@mailman.qth.net Subject: Re:
[Elecraft] Digital mode power handling for KAT3 Message-ID:
<53d23883-e9e2-451d-cb5e-38e78b991...@gmail.com> Content-Type:
text/plain; charset=UTF-8; format=flowed FT8 is
FWIW: I use my K3/KAT3 at 100 W in RTTY contests with no issues.? %
derating could be a function of the complex impedance at the end of your
transmission line ... my match on all bands is not terrible.
Be aware that the KAT3 has a IF trap (C10/L10) which may
catastrophically fail depending
:
[Elecraft] Digital mode power handling for KAT3 Message-ID:
<53d23883-e9e2-451d-cb5e-38e78b991...@gmail.com> Content-Type:
text/plain; charset=UTF-8; format=flowed FT8 is definitely full duty
cycle for its 13 second transmit period, but of course then it is idle
for the last two period an
...@mailman.qth.net wrote:
Message: 7 Date: Wed, 11 Oct 2023 12:50:38 -0400 From:
To: Subject:
[Elecraft] Digital mode power handling for KAT3 Message-ID:
<06cf01d9fc63$10461310$30d23930$@gmail.com> Content-Type: text/plain;
charset="us-ascii" Hello. I recently bought a very nice K
key-down at 25 C ambient
I think this answers the question.
73,
Mark, WB9CIF
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of ken.k...@gmail.com
Sent: Wednesday, October 11, 2023 16:51
To: elecraft@mailman.qth.net
Subject: [Elecraft] Digital mode power handling
16:51
To: elecraft@mailman.qth.net
Subject: [Elecraft] Digital mode power handling for KAT3
Hello. I recently bought a very nice K3 from a friend. It has the KAT3
auto-tuner installed. Due to the duty cycle of most digital modes, most, if
not all, external auto tuners are "de-rated"
FT8 is definitely full duty cycle for its 13 second transmit period, but
of course then it is idle for the last two period and idle for the 15
seconds it is receiving.
Dave AB7E
On 10/11/2023 8:20 PM, Ken WA8JXM wrote:
Not just the tuner, the K3 is not rated for full power on 100% duty
Not just the tuner, the K3 is not rated for full power on 100% duty cycle
modes. Just like it's not rated or 100% key down CW. But realize that
many of the modes are half transmit and half listen.
Different digital modes have different duty cycles.
From the W1HKJ.com website:
100% duty cycle:
FWIW: I use my K3/KAT3 at 100 W in RTTY contests with no issues. %
derating could be a function of the complex impedance at the end of your
transmission line ... my match on all bands is not terrible.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
ken.k...@gmail.com wrote on
Hello. I recently bought a very nice K3 from a friend. It has the KAT3
auto-tuner installed. Due to the duty cycle of most digital modes, most, if
not all, external auto tuners are "de-rated" for digital modes. I haven't
been able to find any reference to this for the KAT3. Does anyone know
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