Got up early this morning and noticed a soft yellow glow from the shack. I
never leave anything on so upon closer inspection, I found my KPA 500 display
was on and the message said MCU Load. The power switch on the front of the amp
doesn't work, the menu button doesn't work and the only way
John,
Someone will be contacting you about this very shortly.
73,
Wayne
N6KR
On Feb 18, 2014, at 9:31 AM, John Veach k...@att.net wrote:
Got up early this morning and noticed a soft yellow glow from the shack. I
never leave anything on so upon closer inspection, I found my KPA 500 display
So, I got responses from Greg here on the reflector but also from Gary, Dick
and Wayne at Elecraft. A simple download fixed the problem. I couldn't get the
amp to turn on so the KPA utility wouldn't connect to it from my puter but when
I told the utility to reload the software, it did it
On at least one occasion when I thought my amplifier had blown up, and it
turned out only to be a bad coax cable in the shack. So even when testing
by running the amp directly to a dummy load, it's a good idea to try more
than one coax cable.
73,
Dick- K9OM
In a message dated
Seems to be a threshold around 25 watts. for the two bands I checked. I
drive my amp with 13 watts on 30 for 200 out, so in standby, I don't
show any power.
Joe Hutchens ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
On Thu, Oct 24, 2013 at 1:41 PM, Robert Redmon wrote:
Sorry if this
This is most likely an antenna problem. As my friend K9YC will testify,
vertical antennas need a good current return path, which is usually a good
radial system. Without it the return current will be carried wherever it can,
which usually winds up being on the outer edge of the coax cable
I will second Jack's observations. When we remodeled and added the room
that houses my radios, I had them put a 3 steel pipe from a 1' square
utility box in the wall straight up the wall with a weatherhead on top.
The box opens into the shack under the desk and also into the carport.
I
If I understand the problem description properly, the VSWR was NOT
observed with the K3 running 100w, but WAS observed with the KPA500
making only 75w. That seems to suggest it's not the antenna. An
external SWR meter between the KPA500 and the antenna would be useful.
It may be meter calibration
In a follow-up to my original comment Bob answered off list and I suggested
a ground problem. He replied:
Ron, you hit the nail on the head. Problem turned out to be old ground
connections at the towers and the ground rod outside the shack. They all
still looked good, but I chose to clean and
Sorry if this is a duplicate message, but the original didn't
(apparently) show up in the archives this morning.
My KPA 500 has done something that confuses me. On _30 meters (only)_,
it has stopped displaying PWR and SWR while in standby mode. Other bands
work as always (displaying both pwr
Bob;
Stopped displaying it on the LEDs, LCD (when selected) or both?
Most likely the transmitter is not outputting more than 25 watts on that band,
so it is below the minimum threshold needed to display this info.
Jack Brindle, W6FB
On Oct 24, 2013, at 10:41 AM, Robert Redmon
Hi all.
The KPA is a good performer. Even when it get at 70C temperature, it
doesn't crank down the power.
It's noisy that's right compared to no noise there is some when it is
hot. But with my previous experience with a 1K-FA by SPE it is much
silent than that. Power is comparable in between
I can add a few cents to this one. I've used the KPA500 in the usual big
and in some of the small contests. It works transparently. When running
stations on cw, the temp tends to rise to the mid-to-high 30's C. While
I have no doubt that the temp sensitive fan would speed up to meet the
Hows the KPA-500 holding up under contest conditions for SSB and CW?
I've read the reviews on eham but there was only one that referenced
performance in contest conditions (and it was favorable).
I'm curious if the temp stays down and if power is lost as it heats up?
Thanks
Rich - N5ZC
: Fri, 12 Jul 2013 08:48:52 -0500
Subject: [Elecraft] KPA-500 in Contest Conditions
Hows the KPA-500 holding up under contest conditions for SSB and CW?
I've read the reviews on eham but there was only one that referenced
performance in contest conditions (and it was favorable).
I'm curious
On Fri, 12 Jul 2013 08:48:52 -0500, Richard Thorne wrote:
Hows the KPA-500 holding up under contest conditions for SSB and CW?
I've read the reviews on eham but there was only one that referenced
performance in contest conditions (and it was favorable).
I'm curious if the temp stays down
conditions.
-Original Message-
From: Richard Thorne rtho...@rthorne.net javascript:;
To: Elecraft Reflector elecraft@mailman.qth.net javascript:;
Date: Fri, 12 Jul 2013 08:48:52 -0500
Subject: [Elecraft] KPA-500 in Contest Conditions
Hows the KPA-500 holding up under contest conditions
On 7/12/2013 6:48 AM, Richard Thorne wrote:
Hows the KPA-500 holding up under contest conditions for SSB and CW?
It works VERY well. Long before I bought my KPA500, I beta tested it
during a RTTY contest. My instructions were to run it with all the
lights lit. It produced full power for the
--
Message: 6
Date: Fri, 12 Jul 2013 08:48:52 -0500
From: Richard Thorne rtho...@rthorne.net
To: Elecraft Reflector elecraft@mailman.qth.net
Subject: [Elecraft] KPA-500 in Contest Conditions
Message-ID: 51e00944.7070...@rthorne.net
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hows the KPA
I have had this problem since the my KPA was new 7 months ago.
Occasionally it would not turn on when the on button was pushed, you had
to cycle the rear power switch and then the on button would turn on the
KPA. This problem has gotten much worse and now occurs about 50% of the
time.
Is
Same for my KPA-500.
I haven't studied the sequence of how I shut it and the K3 down but have always
assumed that sequence is involved.
This is not unlike the earlier issue of bringing the K3 and KPA500 online out
of order and seeing the amp fail to operate.
On Jun 26, 2013, at 5:53 AM,
I've also had that happen here, but it appears to be related to the power up
sequence. If the KAT500 tuner is NOT the first thing powered up, the K3 will
hang and the KPA500 sometimes may not turn on either. My solution (until Wayne
can address a programming glitch in the K3) is to have the
Just built the amp but cannot find anywhere it says what the INFO button is for?
W5KDJ - Wayne Rogers USNR (Ret.)
3DA0KDJ 5R8KD 7P8KDJ
A25KDJ C91KDJ SV0WWW
TF2WJN YI9PSE YN2KDJ
LoTW eQSL (No Bureau)
Diplomacy is the art of saying 'Nice
doggie!' until you can find a rock.
Under Hard Faults on page 12 of manual.
Joe Hutchens ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
On Fri, May 17, 2013 at 5:19 PM, W5KDJ wrote:
Just built the amp but cannot find anywhere it says what the INFO
button is for?
W5KDJ - Wayne Rogers USNR (Ret.)
3DA0KDJ 5R8KD 7P8KDJ
I expect to receive my KPA500 from Elecraft next week, but the manual
states something on the info button on page 12.
73
Arie PA3A
Op 17-5-2013 23:19, W5KDJ schreef:
Just built the amp but cannot find anywhere it says what the INFO button is for?
W5KDJ - Wayne Rogers USNR (Ret.)
Any word on a change to allow the TS-590 band information to be properly
read by the KPA when using memories? As previously reported, it works fine
in VFO mode, but does not when operating in memory mode.
Gary McDuffie
AG0N
--
Web: http://ag0n.net
NodeOp Page: http://ag0n.net/irlp
Node 3055:
I was wondering about the Performance of the KPA-500 in AM mode of operation?
There are no spec's on the web site that I have seen as of yet. Does anybody
have any experence using it in this mode or can shed some light?
Dave Purola,
N8NTA
Hi Dave, I have used my KPA500 on AM, I keep it down to around 200W on
modulation peaks and I've had some superb quality reports, you can't do better
than a good class A amp!. Remember not to rag chew for hours as it will get
warm...
Best regards, Tim Hague, M0AFJ
Skype m0afj.Tim
Sent on my
We all know that in AM mode the K3 sets carrier power at 25% of the power set
with the PWR control. Can anyone confirm that the K3 switches in the 100W
PA in AM mode when the PWR is set at 13 watts or greater even though the
actual carrier power is limited to approximately 25% or 3+ watts? I
Chuck,
The power knob is set to the PEP value, not the carrier power.
Since you hear the relay click, the 100W PA is switched in. The AM
carrier level and sideband level is controlled by the math functions in
the DSP so that the PEP is the same as the setting on the power knob -
yes, the
it is working fine.
just spent the weekend at a shopping mall ham radio demonstration ... w3c
I get the amp home and i head a bit of a rattle...
open the lid and a zinc screw drops out no washer yet
To disassemble or not ,
that is the question
if the screw is part
If I were you, Bill, I'd send it to me immediately for careful evaluation
and be prepared for dire news.
Dick - KA5KKT
-
it is working fine.
just spent the
right behind the front panel is the 'rectifier' board, home to
much of the zinc hardware
tada ...
one of the three missing
and there was no sign of a star washer on the screw, musta been short .
no I will get one for that.
open it up ... is was the only choice
:)
bill /3
From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on
behalf of Lu Romero [lrom...@ij.net]
Sent: Monday, January 14, 2013 8:41 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA 500 - Normal behavior?
All:
I have KPA500 #1170 up and running now for several months.
I
: [Elecraft] KPA 500 - Normal behavior?
Message-ID:
276d3d6c9d5c8c4484211e9839fde1ab0cf83...@citesmbx5.ad.uillinois.edu
Content-Type: text/plain; charset=us-ascii
I don't have any of that behavior. I can turn one on/off or
the other.
I think you have more pins connected that Elecraft does
@mailman.qth.net
Subject: Re: [Elecraft] KPA 500 - Normal behavior?
Message-ID:
276d3d6c9d5c8c4484211e9839fde1ab0cf83...@citesmbx5.ad.uillinois.edu
Content-Type: text/plain; charset=us-ascii
I don't have any of that behavior. I can turn one on/off or
the other.
I think you have more pins connected
All:
I have KPA500 #1170 up and running now for several months.
I wonder if other users see what I see:
The amp turns on with the rig, but does not turn off with
the rig. You still have to press the power button on the
amp to turn it off. When the amp is on and the rig is on as
well, the
You are using a DB-15HD cable that has all of the wires present. There are
some lines in the DB15HD that should be cut. If you get the official K3
cable from Elecraft some of the pins in the connector have been cut out.
The KPA500 manual will show you what pins should be present in a cable.
Make
Question: What band is selected when the Radio=BCD and the inputs are
open?
It appears to revert to RF sensing.
The situation is this. Antenna switching stuff automatically echos the
band BCD data to the KPA-500. The exception is if one manually selects
an antenna. In that case power to
Brian,
The open BCD lines should signal 60 meters to the KPA500. See the band
data chart in the K3 manual.
The normal way the KPA500 works (with the K3) when you press a band
button on the KPA500, it communicates that information to the K3 over
the AUXBUS - the KPA500 does not receive
Brian,
OK, Jack Brindle sent me a correction - open BCD lines are at a high
level, not low, so the band is undefined. Also, the AUXBUS is not in
use for this situation.
Sorry for the confusion.
73,
Don W3FPR
Brian,
The open BCD lines should signal 60
Thanks guys. This is how it is behaving. I don't have a schematic for
the KPA-500 so it is impossible to determine if there are pullup
resistors or not.
Glad that Elecraft firmware recognizes that if the band is undefined, RF
sensing of the band become active.
73 de Brian/K3KO
On
Brian;
As I noted previously, RF sensing is _always_ active. If the transceiver
somehow indicates the wrong band, the KPA will go to the correct one due to its
RF sense. As for the band inputs, they are diode protected, with pull-ups on
the inside of the diodes - that is the side closest to
I received my KPA recently as a kit. Assembly has gone well to this
point. However, I cannot get the fan connector to slide down over the
very long pins on the PC board. They insert and feel like they should,
and like they are engaging properly with the pins, but it lacks 5mm of
going on flush
Rich, You did not specify if your were on SSB or CW. There is no problem
when on SSB.
The real issue is when on CW or RTTY. The constant cycling and roar of the
last fan speed is
very unnerving.
Toby W4CAk
__
Elecraft mailing
Noise canceling headphones might help. I got some for when our
ARES/RACES group works events like parades. I found them useful
for airplane trips. In my shack I have to deal with noise from
refrigerators, washing machines, driers and dishwashers. They
help there too.
Cheers - Bill, AE6JV
Don,
Feel free to share it here.
73,
Eric
www.elecraft.com
_..._
On Nov 6, 2012, at 2:34 PM, donehrl...@q.com donehrl...@q.com wrote:
Toby,
I am far more sensitive to fan noise than most folks and have spent a
lot of time making my KPA500 much quieter by modifying it and by other
I have had the amp now about a year.
The cooling fan is just fine when using SSB, but when on cw and running a
while at full output, the fan comes on and sounds like it is going to take
off from the table. It is really loud
I have the fan speed set to 1, but wonder what others are
Toby,
I am far more sensitive to fan noise than most folks and have spent a
lot of time making my KPA500 much quieter by modifying it and by other
means. This topic is probably not of interest to most on this list
because, compared to most amps, the KPA500 is NOT loud (and many have
said it
] KPA 500 Fan Noise
Toby,
I am far more sensitive to fan noise than most folks and have spent a
lot of time making my KPA500 much quieter by modifying it and by other
means. This topic is probably not of interest to most on this list
because, compared to most amps, the KPA500 is NOT loud
I determined the cause was a flaw in the recent shack remodeling. I had
the K-3 and the amp. under a shelf that apparently wasn't allowing
enough air flow. Even though I had the more then the recommended
clearances for air flow, that was not enough. I put the amp. out in the
wide open Sunday
Same experience here: K3 driving the KPA-500 on 220v to about 500w out with
23-26w drive, depending on band. When RTTY CQing, with reasonable period
between CQs (like 3-4 seconds), amp temp gets up to 57-60c and the fan does
its thing.
When I'm getting answers to every CQ, amp temp usually stays
Am running my fairly new kpa-500 in the rtty contest. It is situated out
in the open.
it from 220v and during the run it's current runs at 10a and 64-74v. The
temp starts at 35c and as I run it slowly creeps up to 55-57c and kicks
out with the error message of Pwr In High.
I'm only driving
Dwight.
Something is wrong. Mine at 400-500 watts gets to about 65C during
bunches of RTTY CQ's. It probably can go higher. Fan kicks in at
expected values. 240v line.
73 de Brian/K3KO
On 9/30/2012 14:53, DGB wrote:
Am running my fairly new kpa-500 in the rtty contest. It is situated out
My specs:
250 watts out
10 watts drive
64 volts
8.5 amps
240 V line
Temp has got up to 52c @ 300 watts.
Haven't seen any warnings, but the fan kicks in more often as expected.
I'm uneasy running it at 500 watts during a contest.
Joe Hutchens ( AJ8MH )
I thought about this for a couple seconds... I have seen some rigs have
a rather large difference in power out between mark and space tones.
With a small difference in drive I would expect to see a large
difference in power out of the amp with these radios. I've also heard
some radios with a
Hmmm... I run my KPA500 @ 500W on RTTY most of the time. 120V AC. 15/10 I
usually run barefoot @ 100W. KPA500 tops out @ ~68C. Sounds like somthing is
wrong for you.
73,
Fred K6DGW
Sent from my Samsung Epic™ 4G
DGB ns9i2...@bayland.net wrote:
Am running my fairly new kpa-500 in the rtty
The temp starts at 35c and as I run it slowly creeps up to 55-57c and kicks
out with the error message of Pwr In High.
does it read 35 degrees C when the amp is cold? and is it that hot in
your shack?if this is the reading from a cold start I am guessing
the temp sensor is not
On 9/30/2012 7:53 AM, DGB wrote:
Anyone have a similar problem, makes it useless for rtty contesting and
running. No problems in CW contests at full bore!
Something is broken. I get 500W out on 6M (the most difficult band)
with modes like JT65, ISCAT, and FSK441 for 48 seconds on each
I am not a design engineer or a technician.
Simply a ham for 51 years or so.
I have always loved 500 watt amps. My first was a Collins 30L-1.
Still have it.
Bought the first 12 volt solid state amp from Trans World Communications.
Still have it.
Bought the Icom AT 500.
Still have it.
Bought the
On 8/5/2012 7:29 PM, NZ0T wrote:
I would like to hear opinions on if it makes any difference to configure the
KPA-500 for 220 volts? Is it any more efficient?
The advantage of 240V operation is better voltage regulation, due to
half as much IR drop in the wiring between the breaker panel and
You are absolutely correct - less current, less wire heating, better voltage
regulation. In my case all are offset by what the XYL would do to me if I told
her I was going to have a 220V run going into one of our bedrooms! Ouch! :-)
Jim / W6JHB
On Sunday, Aug 5, 2012, at Sunday, 11:14 PM,
Bill wrote;
I would like to hear opinions on if it makes any difference to configure the
KPA-500 for 220 volts? Is it any more efficient? Seems to me that 110
would be the way to go for portability as long as efficiency is the same or
nearly the same.
73 Bill NZ0T
I have
Jim, W6JHB wrote:
You are absolutely correct - less current, less wire heating, better
voltage regulation. In my case all are offset by what the XYL would do to
me if I told her I was going to have a 220V run going into one of our
bedrooms!
It's all in how you sell it, Jim. But honey, we needed
Electric meters measure current consumption on both 120v legs when
calculating total watt hour consumption. So it matters not one bit if the
loads are balanced or unbalanced from a billing point of view. Rumors to
the contrary are simply not correct.
The reason for running the amplifier at a
-Original Message-
From: Richard Fjeld
Sent: Monday, August 06, 2012 9:53 AM
To: elecraft posting
Subject: [Elecraft] KPA-500 110 or 220?
I have read that an Electric Meter (wattage meter) will run up the bill more
if the load is not balanced across the two feeders in the meter
In some 120VAC installations with significant voltage droop under load, it's
a challenge to find the right tap so the 60V output of the KPA500's high
voltage supply doesn't sink too low key down or rise too high key up.
The 60V supply is not regulated.
If the voltage rises too much the amp will
On 8/6/2012 11:21 AM, Ron D'Eau Claire wrote:
If the voltage rises too much the amp will shut itself down to prevent
damage. If the key down voltage drops below 60V IMD increases and the
maximum power available may be less than 500 watts.
This mostly an issue on 6M, where the output devices
Actually it's I-squared R drop, and a 1/2 reduction in current results in a
75% loss reduction.
Monty K2DLJ
On Aug 6, 2012, at 1:27 PM, Bob wb4...@gmail.com wrote:
Electric meters measure current consumption on both 120v legs when
calculating total watt hour consumption. So it matters not
August 2012 5:00 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-500 110 or 220?
Actually it's I-squared R drop, and a 1/2 reduction in current results in
a 75% loss reduction.
Monty K2DLJ
On Aug 6, 2012, at 1:27 PM, Bob wb4...@gmail.com wrote:
Electric meters measure current
The thing that matters is the voltage reduction under load.
IR is correct for the voltage reduction.
I squared R would represent the power reduction from the power panel
to the shack.
73,
Don W3FPR
On 8/6/2012 2:59 PM, Monty Shultes wrote:
Actually it's I-squared R drop, and a 1/2 reduction in
Let's end this thread at this time.
73,
Eric
---
www.elecraft.com
On 8/6/2012 1:43 PM, Don Wilhelm wrote:
The thing that matters is the voltage reduction under load.
IR is correct for the voltage reduction.
I squared R would represent the power reduction from the power panel
to the shack.
On 8/6/2012 11:59 AM, Monty Shultes wrote:
I-squared R drop,
I'm sorry, but you are mistaken. Voltage drop is IR. The POWER lost in
the resistance of the wire is I squared R.
To complicate things even more, the current drawn by any power supply
with a capacitive input filter is a pulse,
Subject: Re: [Elecraft] KPA-500 110 or 220?
-Original Message-
From: Richard Fjeld
Sent: Monday, August 06, 2012 9:53 AM
To: elecraft posting
Subject: [Elecraft] KPA-500 110 or 220?
I have read that an Electric Meter (wattage meter) will run up the bill
more if the load
I would like to hear opinions on if it makes any difference to configure the
KPA-500 for 220 volts? Is it any more efficient? Seems to me that 110
would be the way to go for portability as long as efficiency is the same or
nearly the same.
73 Bill NZ0T
--
View this message in context:
When I moved my shack inside the house from the garage (where I had 220V
readily available), I had to use 110V all around. I did not want to run a
220V line to an inside bedroom where my new shack would be. I have noticed
no difference from when it was outside in the garage running off 220V. I
Like Roger, W5RDW, I run my KPA500 from a standard 117V wall outlet in a
downstairs bedroom. This room also supplies power to my large iMac and several
other 117V devices - not a single problem, and I've often run it between 500 -
550 watts on 160 - 10. (Not 60 or 30 meters, of course…) :-)
Just to add to the statistics ... # 0971 has just been put together and
working great, in 5 hrs assy time
!
73 Dwight NS9i=I
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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
Folks, this thread is drifting too far afield. Let's end the general fan
discussion at this time.
In the future, please resist the urge to post on OT threads like this when
there are already a lot of responses in a short period, like this one.
While OT threads are allowed, we ask that people
Recently, I sent the KPA 500 in for a repair ( probably my fault ) which they
covered under warranty.
When the amp came back I noticed these Mods and upgrades:
Replaced 39PF 1kv 17 meter mod cap with a 2kv. Added fan and side handle
spacers.
Would the spacers help any with fan noise?
The spacers where added to stop damage of the handle and fans by
overtightened the mounting bolts.
It has nothing to do with fan noise
Howard K6IA
Elecraft Customer Support
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Elecraft mailing list
Home:
18, 2012 8:11 PM
Subject: [Elecraft] KPA 500 Fan Noise and cooling performance
On 6/18/2012 4:42 AM, David Robertson wrote: ( ... a long message I
won't include here where he improved amplifier cooling by tightening
heatsink/right panel screws and used heatsink compound.)
I operate my
: [Elecraft] KPA 500 Fan Noise and cooling performance
On 6/18/2012 4:42 AM, David Robertson wrote: ( ... a long message I
won't include here where he improved amplifier cooling by tightening
heatsink/right panel screws and used heatsink compound.)
I operate my KPA500 with the fan speed
On Tue, Jun 19, 2012 at 1:26 PM, Guy Olinger K2AV olin...@bellsouth.netwrote:
...I have tried to get after-market fans that were advertised as quiet,
but no luck...
===
Agreed. I recently built a tower computer and put in a neat-looking 18 cm.
fan in the top of the case. Because it is so
Solution - the Dyson blade less fan. Hihi
On Jun 19, 2012 1:41 PM, Tony Estep estept...@gmail.com wrote:
On Tue, Jun 19, 2012 at 1:26 PM, Guy Olinger K2AV olin...@bellsouth.net
wrote:
...I have tried to get after-market fans that were advertised as quiet,
but no luck...
===
Agreed.
My solution was to buy a Mac Mini, which is as quiet as a church mouse.
73,
Scott, N9AA
On 6/19/12 2:43 PM, Gerald Manthey wrote:
Solution - the Dyson blade less fan. Hihi
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Elecraft mailing list
Home:
Has anyone every operated one of those in close proximity to an HF rig?
We built such fans in College way back in the 1950's and they were a bad
of an RFI generator as any Tesla coil or Van De Graaf generator in the lab!
After all, they work by electrostatic discharge.
Ron AC7AC
I could be wrong, but I think that the Dyson bladeless fan has, in its
base, a regular ol' fan, with blades. As I understand it, that fan
blows air out of holes in the trailing edge of the circular airfoil.
Aerodynamic effects cause a larger volume of air to be dragged through
the airfoil
On 6/19/2012 11:26 AM, Guy Olinger K2AV wrote:
Computers quiet? Obviously have not heard mine. I have tried to get
after-market fans that were advertised as quiet, but no luck.
For a long time, I've been buying only top line Thinkpads (laptops), and
they're pretty quiet. Back when I was
It would be interesting and perhaps not good in the shack if this were
the case but these are not electrostatic.
they are nothing more than a fancy venturi to amplify air flow Air
enters the base of the unit through a “mixed flow impeller” a fancy name
for a turbo like fan. and is forced out
ABSOLUTELY! My HP mini-tower has what is called a whisper quiet fan and it
is very quiet. It certainly does not interfere with conversation, even when
carried on across our open office between desks ten feet apart.
And yet, when I power down the machine at the end of the day, the sudden
quiet is
Everyone,
I have had my KPA500 linear for some time now and have been really happy
with it. I use it with my K3 and they communicate with each other via the
DB15 AUX cable that I built ( the one furnished by Elecraft was too short).
The only issue I have encountered is the finals in the linear
My question is whether you actually increased the no-fan heat dissipation
of the heat sink complex that significantly, or whether what you did is
faking out the heat sensor and causing the fan to NOT come on when it
actually should.
It bothers me also that the increased dissipation is
On 6/18/2012 4:42 AM, David Robertson wrote: ( ... a long message I
won't include here where he improved amplifier cooling by tightening
heatsink/right panel screws and used heatsink compound.)
I operate my KPA500 with the fan speed set to #1 continuously which
delays the increase in the
The fan rarely ever kicks in for me. My QSO's are pretty short. DX,
contests. The only time I have really seen the fans go on is with
RTTY. To it sounds like the OP has or had a problem with the initial
build. If the screws were loose that secured the heat sink panel I
could see that
Sent: Monday, June 18, 2012 10:52 AM
To: David Robertson
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA 500
My question is whether you actually increased the no-fan heat dissipation of
the heat sink complex that significantly, or whether what you did is faking
out the heat sensor
, June 18, 2012 10:52 AM
To: David Robertson
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA 500
My question is whether you actually increased the no-fan heat dissipation
of
the heat sink complex that significantly, or whether what you did is faking
out the heat sensor and causing
Hmmm ... Tight screws yes. Beyond that, I'd be somewhat wary of
re-engineering the thermodynamics of the KPA500 ... OK, very wary. I
have a KX1, K2, K3, P3, and KPA500. They all have one thing in common:
Elecraft equipment is very carefully and meticulously engineered --
electrically,
On Mon, Jun 18, 2012 at 2:59 PM, Guy Olinger K2AV olin...@bellsouth.netwrote:
Again, this conversation needs to be with the engineer. It could be an
improvement, and it could dangerous. Elecraft please weigh in.
Hi again, David,
I have the following from Robert Friess, who is Elecraft's
As Mike suggested in his response, the transmit calibration did the trick for
me. The K3 Utility makes it super easy too.
Thanks for your help!
Jack - WE5ST
-
Jack - WE5ST
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