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@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@contesting.com
> Sent: Wednesday, July 7, 2021 6:25 AM
> To: amps@contesting.com
> Subject: Amps Digest, Vol 223, Issue 8
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> Today's Topics:
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> 1. Relay Burnisher (jim.thom jim.thom@telus.net)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 6 Jul 2021 09:33:44 -0700
> From: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
> To: amps@contesting.com
> Subject: [Amps] Relay Burnisher
> Message-ID:
> <CAB4ZMgu1qNx0_x3g9T0RqyLZmQhMrKC870h7Y=
> TMAH681pFj8g@mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Date: Mon, 5 Jul 2021 19:22:55 +0000
> From: Kevin Adam <n9iww@LIVE.COM>
> To: "amps@contesting.com" <amps@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
>
>
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