Larry
The zero just means that the fans are off (manually). You can set the fans to
be on at speeds 1 through 5 regardless of temp. They will stay on
continually.That said, the fans will operate automatically according to temp.
They will ramp up as the temp increases. I think the first to engage is the
center fan but youcan easily see this yourself. I did some CQing in the King
of Spain contest to get the temp up and test things out. They indeed came on
at 60C. I forgetwhere I stopped, I think at 71C, but the fans will come on
starting at 60C with the fan speed on zero.
I will give it a more robust test this Wednesday during the cwts but that is
only a one hour test. During WPX at the end of the month I will probably set
thefan speed to 2 to get more cooling power below 60C. When the PF1 & PF2
buttons become programmable I will probably set them to turn the fans on or
off.For me a fan speed of 2 is acceptable during a major contest situation even
with headphones off which I really never do normally.
I did find it interesting tonight to see my shack tv get blanked out on xmit.
I only checked 3 bands. TV was ok on 80mtrs but blanked the picture and
soundout on 20 & 40 mtrs, hi. That never happened with either of my tube amps.
I will look into that at a later date.
Good luck with your amp.
BillK3WJV
p.s. The pwr supply fans run whenever you turn the amp on but fans set at zero
no amp fans should be on until 60C.
On Friday, May 18, 2018, 6:07:03 PM EDT, Larry (K8UT) <k...@charter.net>
wrote:
Bill,
My KPA1500 also defaulted to FAN SPEED MIN = 0, but that is not fans off
(at least not on my amplifier).
My fans engage at 60c (low), 65c (medium) and 70c (egads).
Is there a menu explanation somewhere about the start/stop temps and
speeds? I would like a little more hysteresis in the 60c setting: start
at 60c but continue cooling until temp drops to 50c. That might work a
little better when running digital modes with long Tx/Rx intervals.
-larry (K8UT)
------ Original Message ------
From: "Bill Stravinsky via Elecraft" <elecraft@mailman.qth.net>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 2018-05-18 15:41:49
Subject: Re: [Elecraft] KPA1500 S/N 160 delivered today
>After having played with mine extensively last night, I was under the
>impression that the fans would come on automatically when the temp
>reached a certain degree.That is not the case. Mine was defaulted at
>fan speed zero, which is fans off. You have to change the menu item for
>fans to one of your liking. I had read a few postshere on the reflector
>about 2 being an acceptable number. I agree.
>If you crank it up to max (5) you might scare the dog, be careful, hi.
>BillK3WJV
>
>On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe <k...@ncn.net>
>wrote:
>
>Works perfectly so far. The fans have never come on during my testing
>periods, including at full power. Power supply fans under the table are
>quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA
>time.
>
>73, Roy K6XK
>
>
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