[Amps] FT8 power with the KPA1500

[Richard Solomon]

100% ICAS ????

Isn't that a contradiction of terms ??

73, Dick, W1KSZ

On Wed, Jul 7, 2021 at 5:47 PM Mickey Baker <n4mb at arrl.net> wrote:

> From the owner's manual (downloadable at
> https://elecraft.com/pages/kpa1500-1500-watt-linear-amplifier-manuals):
>
>
> *Power Output *
>
> 1500 W PEP CW/SSB/Data
>
> *Duty Cycle at 1500 Watts *
>
> 100% ICAS for 100% duty cycle modulation modes (FM, RTTY, FT8, JT65, etc.)
> 1.8-30 MHz: Maximum 5 minutes key down / Minimum 5 minutes receive (after 5
> minute TX) 50 MHz: Maximum 50 seconds key down / Minimum 50 seconds receive
>
>
> ICAS is defined by Elecraft two ways here, I know it is confusing, but it
> seems like the < 30s tx then 30s rx would be within specs.
>
> Mickey Baker, N4MB
> Palm Beach Gardens, FL
> *“Tell me, and I will listen. Show me, and I will understand. Involve me,
> and I will learn.” *Teton Lakota, American Indian Saying.
>
>
> On Wed, Jul 7, 2021 at 4:30 PM Ron <kh6dv at hawaiiantel.net> wrote:
>
> > How much power can I run on FT8/FT4 with my new KPA1500 ?
> > A friend with the Expert amp limits his output to 1000 watts.
> >
> > Ron KH6DV
> > Kaneohe Bay Hawaii
> >
> >
> > Sent from Mail for Windows 10
> >
> > From: amps-request at contesting.com
> > Sent: Wednesday, July 7, 2021 6:25 AM
> > To: amps at contesting.com
> > Subject: Amps Digest, Vol 223, Issue 8
> >
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> > Today's Topics:
> >
> >    1. Relay Burnisher (jim.thom jim.thom at telus.net)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 6 Jul 2021 09:33:44 -0700
> > From: "jim.thom jim.thom at telus.net" <jim.thom at telus.net>
> > To: amps at contesting.com
> > Subject: [Amps] Relay Burnisher
> > Message-ID:
> >         <CAB4ZMgu1qNx0_x3g9T0RqyLZmQhMrKC870h7Y=
> > TMAH681pFj8g at mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > Date: Mon, 5 Jul 2021 19:22:55 +0000
> > From: Kevin Adam <n9iww at LIVE.COM>
> > To: "amps at contesting.com" <amps at contesting.com>
> > Subject: [Amps] Relay Burnisher
> >
> >
> >
> > < Burnisher with Black Plastic Insulated Handle, For Fine Contacts, 3"
> > Length x 3/16" <Width x 0.007" Thickness (3 count)
> >
> >
> >
> >
> https://www.amazon.com/Jonard-OB-1-Burnisher-Insulated-Thickness/dp/B006C47JOI/ref=sr_1_4?dchild=1&keywords=file+relay&qid=1625512832&sr=8-4
> >
> > <N9IWW
> >
> > ## we used hundreds of the exact same  burnishing tool in the telco I
> > worked at.  This was back in the electromechanical days.  It was the  NA
> > gold standard for burnishing relay contacts.  Back then, they came in  10
> > or 20 packs.  It's an ultra fine surface, so it doesn't destroy any
> > plating.  What worked better for cleaning out  dirty contacts was
> > ...microscrubs...soaked in your favourite cleaning solution. 1-2 passes,
> > and contacts were like new.
> >
> > I would be a bit leery using the burnishing tool  on any gold plated
> > contacts though.  My real fix for these relay issues is to swap to a
> > gigavc  GH-1 ceramic vac relay for both the input and also the output.
> > Then an opto isolator for the  cut off bias.   I also use an opto
> > isolator for the soft key...or use your  favourite  switch transistor.
> >  3PDT mech relays issues  gone forever.   Then it's  qsk on cw if you
> want,
> > and no more tune and or load arcing due to slow mech relays, or mech
> relays
> > that are not quite sequenced correctly.  IE:  applying drive to the amp a
> > split second before the ant is connected on the output side.
> >
> > Plus you can run a kw through the amp when on bypass mode.  I use that
> > feature, so I can calibrate the wattmeter in my drake L4B amps.  To do
> > that, I have to use one amp to feed a kw into the 2nd amp, with 2nd amp
> in
> > bypass mode, powered down, on its side, and bottom lid off, so I can get
> > to the calibration pots.   I also use that feature since I string several
> > L4Bs  in series...tuned up on diffrerant bands or ssb and cw on the same
> > band. . A rotary switch in the key line from  Xcvr, ensures only one amp
> > can ever be in operate mode...simple mech interlock.
> >
> > Jim   VE7RF
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
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> > ------------------------------
> >
> > End of Amps Digest, Vol 223, Issue 8
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