Al,
Is the amp suckling on 120V or 240V??? I'm still on 120V, but
from what I understand, the amp will run hotter, hence fans will
run more.? My Elmer also has the LA-1K, but on 240V, and we have
operated for hours on it, without hardly hearing the fan.? The
only comparison I have is with his, and seems to run cooler on
240V.
My 2?
73 David
On 1/30/2023 5:46 PM, Bernd - KB7AK
wrote:
toggle quoted message
Show quoted text
Certain bands show the same quick rise in
temperature, some other bands rise slower, but I pretty much
have to stop operating digital modes after about 10 to 15
minutes.
?
2 QSOs on 40M are enough to get temp to the
point were the first loud fan starts, after 10 minutes or less
the next level fans start at 63 degrees C, by then I usually
stop, because the noise level of the fans is really annoying.
?
73,
Bernd – KB7AK
?
?
I actually have a small fan sitting next
to the amp which I have found helps the quick temperature
rise.
?
I have had my la-1k for a few years
now, and it has never gotten hot in SSB use (usually
<500 W). I have recently found out how to solve a
problem I had with it constantly going into SWR bypass in
a digital mode, so am now trying to get some use out of it
there. For the short transmission modes and activities it
will likely be fine, however I do some nets and operations
that have longer transmission times - sometimes more than
a minute or maybe even two minutes. Obviously this is
really a 100% duty cycle, but I am only driving it with 5
watts to get about 125 watts output. I am happy with that
level of output, but when I made a longer transmission the
temp quickly climbed up to 80 C! Fortunately that was the
end of the message, or I would have had to terminate it. I
am driving an 80m double bazooka single-band antenna with
a native SWR of 1.02. The meter on the amp says 1.0. As a
side note if I go through my HF-AUTO tuner, it shows a low
SWR also, but the amp shows 1.2 or 1.3. I often see this
when I use the tuner, the amp SWR is always about .1 to .3
higher than the tuner is showing. Given the nature of my
digital operations I think it is better to just go direct
to the antenna.
Any thoughts or suggestion would be great.? 73's
Al
KD2PNR
--
?
??Rev.
Terry N. Hursh, M.Div, J.D
5
Rapallo Mews. Mississauga . ON L5N 1K8 Canada
