Consider re-calibrating the temperature sensors in your K3 before
getting too alarmed about the readings.
From the Owner's Manual:
Front Panel Temperature Sensor
Turn the K3 OFF. Allow about 15 minutes for
the radio to cool to room temperature.
Turn the K3 ON.
Locate the CONFIG:FP TEMP
Tom N0SS said
What bothers me, a bit, is that my cooling fans seem to be running a LOT
more frequently, and at higher speeds, than they did several firmware
versions ago.
My FP temperature rose from 18 C to 35 C in a three-hour test yesterday.
I don't believe the fans came on but not sure as I
The fans only come on in response to the PA temp sensor. In a future
release they'll also come on if the FP temperature is excessive. But so
far, I haven't seen any reports of excessive FP temperature -- they're
all in the acceptable range.
73,
Wayne
N6KR
On Jan 27, 2009, at 6:21 AM, Mike
Hi,
I'd like to suggest that Enhancements and App notes be assigned numbers, so
they'll be easier to keep track of.
73, doug
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That's interesting. I would think that the PA shielding and top
venting would make the fans pretty ineffective for cooling the FP. Or
is the idea that if the FP is too warm, the PA is probably too warm as
well, regardless of the reported PA temp?
73
--
Joe KB8AP
On Jan 27, 2009, at 8:39
that with kpa3=fn1, the fans do speed up if pa
temp rises.
Dave Hachadorian, K6LL
Yuma, AZ
- Original Message -
From: wayne burdick n...@elecraft.com
To: m...@paxsen.com
Cc: Elecraft@mailman.qth.net
Sent: Tuesday, January 27, 2009 4:39 PM
Subject: Re: [Elecraft] K3 temperature
The fans
Since K3 #145 has had it's sub receiver the forward area of the right hand
side panel seems to get a little warmer and I've assumed this is due to the
sub rx or second dsp drawing extra through the 2 voltage regs bolted to that
panel. Shows it's all working ok since the panel is the heatsink for
Well...
I must agree that, since the addition of the KRX3 in my K3, the internal temps
HAVE risen on the order of about 10 deg. C overall... However, this is NOT
anything I didn't expect... in fact, I seem to recall that Wayne even posted
(somewhere) that KRX3 users would notice higher internal
Since I fitted the second receiver, my K3 is running a whole lot warmer,
even on receive with the sub receiver turned off.
In particular the front half of the right hand side panel is almost hot and
the front right hand corner of the top cover is also very warm.
Before the second receiver
Mine (S/N 56) with a 2nd receiver has been turned on
all day, and I see the PA @ 23C and the FP @ 29C.
The room ambient is 63F
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
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Hi Barry,
I have noticed the same. Here also, the FP temp settles at roughly
36C, receive only. This is much warmer than before I fitted the KRX3.
Ambient temperature here is about 20C. I have not investigated this
phenomenon any further yet. I do consider it to be a bit warmer than
normal
Since I fitted the second receiver, my K3 is running a whole lot
warmer, even on receive with the sub receiver turned off.
The aux DSP adds around 100 mA even when the sub receiver is turned
off, as I recall, so some increase in temperature is normal. The KRX3
module itself adds nearly zero
To put this into context 37C is very warm, it isn't. I used to do
elevated temperature dynamic burn-in on fiber optic RS-232 modules at 50C in
a precision temperature controlled oven.
You can take a 50C unit out of the oven with your bare hands and it is so
hot you drop it as fast as you can.
You can take a 50C unit out of the oven with your bare hands and it is so
hot you drop it as fast as you can.
I worked in high-speed fiber optic and microwave transmission system design
before I retired. The rule-of-thumb (pun intended) was that 45 deg C was
the threshold of pain. So if it
Hi Stewart,
I have a K3/100 + KRX3/KXV3/KAT3.
In RX/stby it runs 1.01 A @ 14V according to the K3 display. I agree that
the temperature is quite high. With about 26.7 degC in the shack I read FP
41 degC and PA 36 degC after 1 hr stby. I guess the two DSPs are generating
quite some heat + the FP
...14 W in standby with AF volume at normal
level, with all my options, seems a bit low. I would rather expect something
in the range of 50 to 100W.
The heritage of the K3 is portable operation, so we worked pretty hard
at keeping the current drain low without sacrificing performance.
Maybe
I have had my K3 on receive most of the day, whilst doing other
things in the shack.
By chance I touched the top of the case and it felt quite hot,
given that the shack temperature is 26 deg. According to the LCD
readout both the FP and PA temps were at 34 deg.
It got me wondering, what are the
Hi Stewart,
Something wrong there - we have two K3s that run 48+ hours in serious CW
contesting - minimal temperature rise for both rigs.
73, Ken ZL1AIH (ZM1A in contests)
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Stewart, I don't know the specifications. My shack is 23C and the K3
has been on receive all day. The FP is 31-32C and PA is 30C.
My fans start when I'm barely into a QSO and when the PA reaches 37C.
I calibrated the PA just yesterday.
73, GAry W7TEA
I have had my K3 on receive most of
Thanks Gary (and others),
I think that since fitting the 2nd RX the unit gets quite a bit
warmer. The supply volts are 13.7 and the current on receive is
1.07A, so that's about 14W, not excessive.
If the unit is on receive and the fans are not running, the only
place for the heat to escape from
Everyone,
How do I display my FP and Heat Sink temperatures on the front Panel?
I did the calibration and the book explains that you tap Display and use XFO B
to select the temperature reading you want displayed.
When I tap Display all I can select is Time, Date, Current, and Voltage. No
temp
You must turn Tech Mode ON to see the temp readings.
-Bruce N1RX
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