is from 1/30/11.
73,
Mark, WB9CIF
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Dick Bingham
Sent: Thursday, May 2, 2024 02:16
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 Failure
-- An update on my KPA500 failure --
I extracted the amplifier/LPF
-- An update on my KPA500 failure --
I extracted the amplifier/LPF assembly from the case
and examined the two units:
- Power FETs and all components *appear* to be OK
- *LPF Module Rev D* bd appears to be what failed. The
SM component positioned between C97, C110 and
C111 *MAY* be C96 -
Selling my KPA500 #3792 and KAT500 #2879. Both units clean and in top
condition, casual CW, no DATA or SSB, not used much due to antenna
restrictions. Includes interconnect cables for K3/K3S, power cables, KUSB
interface, KPA500 power ca for 240 Vac. Prefer to sell as a unit, but open for
A 1.5 KW external wattmeter is much less expensive than a major KPA500
repair - I would not risk it.
73,
Don W3FPR
On 4/3/2024 6:15 PM, Mike Murray wrote:
If a KPA500 is in standby, can it be used to determine power output from
another amp by feeding the signal thru the KPA? I don't
Check the KPA500 manual. From memory, the max throughput in standby is
200W. As I say, check my memory against the manual.
*Ken*
*WA2LBI*
On Wed, Apr 3, 2024 at 6:36 PM Mike Murray wrote:
> If a KPA500 is in standby, can it be used to determine power output from
> another amp by feeding the
If a KPA500 is in standby, can it be used to determine power output from
another amp by feeding the signal thru the KPA? I don't currently have an
external power meter I can utilize to check output of an SB200, but I also
don't want to risk damaging the KPA.
73,
Mike - W0AG
I am looking for an Elecraft KPA500 amplifier and KAT500 antenna tuner.
73 Randy
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Check eBay. One was just listed.
On Mon, Mar 18, 2024, at 10:26 AM, Josep via Elecraft wrote:
> Looking for a KPA500 for my Remote station, does anyone have any that
> don´t need/use anymore..?
> Thanks,
>
>
> 73,
> JosepEA6BF
> BUG #256 - CWOps #3072 - FOC #2182 (ex 1724) - CTDXCC - HSC
Looking for a KPA500 for my Remote station, does anyone have any that don´t
need/use anymore..?
Thanks,
73,
JosepEA6BF
BUG #256 - CWOps #3072 - FOC #2182 (ex 1724) - CTDXCC - HSC #2016
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OK so are you sure that the cables have been connected exactly according to the
KAT500 manual (page 5)?
When you power up the KPA500 (with the K3 already on) do you see the KPA500
announce itself in the VFO-B area of the K3?
73,
Alan - G4GNX
South Coast UK
Elecraft K4D / KPA500 / KAT500 /
Can anybody tell me how to unsubscribe from this?
Sent from Yahoo Mail on Android
On Mon, Dec 4, 2023 at 6:34 PM, G4GNX wrote: Can we have a
little more info please.
Do you have two 15pin cables, one from the K3 to the KAT500 and one from the
KAT500 to the KPA500?
Are the cables
Can we have a little more info please.
Do you have two 15pin cables, one from the K3 to the KAT500 and one from the
KAT500 to the KPA500?
Are the cables genuine Elecraft E850463 Aux Interface Cables or are they VGA
style cables (which won’t work)?
You should not need any other cables
Here’s the problem: I’ve been successfully running a K3/KPA500/LDG AT-600ProII
with no problems, usually USB and digital modes at about 400W out. I recently
obtained a KAT500 and replaced the LDG tuner. I used the Elecraft 15-pin cables
for full integration. The KPA500 follows the K3 when I
If you use the key-line interrupter, then you must use the phono-plug cables to
connect the K3, KPA and KAT. Otherwise PTT will not get to the amplifier.
Of course using both without the key line interrupter is very redundant. You
just don’t want to use both if an external device is included.
SteppIR will accept up to 200 W without damage and opening the amplifier key
line is the standard way protect SteppIR antennas.
It has been asserted that "NO key line interrupter is needed". However,
Elecraft recognizes that they may be such a need and sells an adapter to
disable keying by
Key line interrupt would probably not be a good way since the transceiver is
still transmitting, but at a lower level. All key line interrupt does is to
disable the amplifier.
I would think a better way would be to use the K3’s inhibit input signal if you
really need no tx power coming out.
"In the KAT500 manual, page 5, Figure 1 Cabling Diagram, is the better and
safer way to configure the system. NO key line interrupter is needed.
How does an Elecraft station that controls KPA500 and KAT500 using AUX cables
inhibit keying when a SteppIR antenna is moving the tapes? This
From: Andy Durbin
To: "elecraft@mailman.qth.net"
Subject: [Elecraft] KPA500 / KAT500 and W2
watt meter question Message-ID:
Content-Type: text/plain; charset="iso-8859-1" "I just ordered the
KPA500/KAT500 combo and W2 watt meter for my K3S. Should I use the key
line
"I just ordered the KPA500/KAT500 combo and W2 watt meter for my K3S. Should I
use the key line interrupt connected to the W2 watt meter or should I connect
the key line interrupt to the KAT500? Do I even need to use key line interrupt
with the K line set up?"
Why would it hurt to have
The KAT500 will interrupt the amp properly. Radio key line goes to KAT,
then KAT key line goes to KPA. Coax is opposite: Rig to Amp, then Amp
to Tuner, then Tuner to Antenna.
On 10/10/23 08:17, Glenn Maclean wrote:
I just ordered the KPA500/KAT500 combo and W2 watt meter for my K3S. Should
Glenn;
You will want the two Aux cables to connect the K3S to the KAT500, then the
KAT500 to the KPA500. The cables are described in the equipment manuals.
When the KAT500 is in a tune or finds some error situation, it will negate the
key line to the KPA500 until the KAT is able to correct the
The original post is in the archives so I am sure that was distributed:
https://mailman.qth.net/pipermail/elecraft/2023-October/293543.html
John KK9A
Dean, K2WW wrote;
I don't see the original thread only Bob's reply?
I've noticed these broken thread quite frequently...Has anyone else see
this?
;
>
> On 10/10/2023 7:18 AM, elecraft-requ...@mailman.qth.net wrote:
> > Message: 23 Date: Tue, 10 Oct 2023 05:17:26 -0700 From: Glenn Maclean
> > To: elecraft@mailman.qth.net Subject: [Elecraft]
> > KPA500 / KAT500 and W2 watt meter question Message-ID:
> > <3a0e28e4-84
menu PWR SET to Per Band.
73
Bob, K4TAX
On 10/10/2023 7:18 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 23 Date: Tue, 10 Oct 2023 05:17:26 -0700 From: Glenn Maclean
To: elecraft@mailman.qth.net Subject: [Elecraft]
KPA500 / KAT500 and W2 watt meter question Message-ID:
<3a0e28e4-8
I just ordered the KPA500/KAT500 combo and W2 watt meter for my K3S. Should I
use the key line interrupt connected to the W2 watt meter or should I connect
the key line interrupt to the KAT500? Do I even need to use key line interrupt
with the K line set up?
Thanks in advance
Glenn WA7SPY
Sent
I'm selling my KAT500 and KPA500. I've hardly used the KPA500,
preferring to operate at 100 watts. It's currently wired for 240 Volts.
Power cords included, but no interconnects. $2000. Buyer pays
shipping. Thanks for looking.
Bill AD6JV
The amp and tuner have been sold. Thanks for your interest.
> On Oct 4, 2023, at 4:27 PM, James Bennett via Elecraft
> wrote:
>
> Time to clean house of items that are rarely used. I’m selling my KPA500
> (serial # 3645) and KAT500 (serial #2726). Both were built by me a few years
> ago and
On 8/31/2023 2:45 PM, Henry Pfizenmayer via Elecraft wrote:
I have a friend across town who has a KPA500 built from a kit Aug 2017 SN
33XX who has never used his K3S or KPA500 on17 m and just got an antenna for
17 and lo and behold NOTHING he does will allow operation on 17.
Hank,
Will
I have a friend across town who has a KPA500 built from a kit Aug 2017 SN
33XX who has never used his K3S or KPA500 on17 m and just got an antenna for
17 and lo and behold NOTHING he does will allow operation on 17.
He normally always used the Utility to change bands etc .So he took that
Mine was bought new in the Summer of 2022 and on most bands it needs
watts to be in the mid to upper 30s to get the 500 out.
On 7/20/23 13:04, Andy Durbin wrote:
I have been told that the gain of the KPA500 has increased over the years it has been produced.
"Early" KPA500 are reported to
Andy,
Pitch out the highest, and lowest, and it looks fairly flat...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 7/26/23 11:00, Andy Durbin wrote:
I now have data for nine
I now have data for nine KPA500 with serial numbers ranging from 11x to 478x
(exact serial number intentionally obscured). Thanks to everyone who
contributed.
The data show no significant increase in gain from the earliest to the latest
serial numbers. However, the data do seem to suggest
Thanks to all those who have submitted test data. I shall need more to have
any hope of seeing a correlation so please keep it coming.
Requested data:
Serial number; frequency; drive power; output power (target 500 W); PA voltage
(front panel HV); PA current (front panel CUR); power
I have been told that the gain of the KPA500 has increased over the years it
has been produced. "Early" KPA500 are reported to need 35-39 W to produce 500
W out. "Later" KPA500 are reported to need only 20-25 W for full output. The
difference in gain has been attributed to difference in the
On 7/16/2023 6:43 AM, Rajiv Dewan wrote:
What do you think I should check or do?
Call Elecraft support. Their service techs will likely have seen it before.
73, Jim K9YC
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/16/23 08:45 (GMT-06:00) To: elecraft@mailman.qth.net Subject: [Elecraft]
KPA500 PA DISS fault Hello, My KPA500 developed a PA DISS fault right the
start of the VHF contest operating FT8 on 6m. It is:* showing this message on
all bands. The antenna is fine. (1.2 SWR)* same fault even when
Hello,
My KPA500 developed a PA DISS fault right the start of the VHF
contest operating FT8 on 6m. It is:
* showing this message on all bands. The antenna is fine. (1.2 SWR)
* same fault even when feeding a good dummy load
* I smelt acrid smoke :(
What do you think I should check or
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There are also taps inside the KPA500 that need to be set correctly, for
the voltage you wish to use. The assembly manual fully describes setting
the taps appropriately, for your desired voltage.
73 de,
Ian, NV4C
On Mon, Jun 5, 2023, 10:58 AM Irwin KD3TB wrote:
> Joe,
> On the back of the KPA
Joe,
On the back of the KPA 500 you will find a fuse plug. You will switch this
between voltages using different fusses. Be careful to use the correct
fusses for the specific voltage. You can find the directions in the manual.
Irwin KD3TB
On Mon, Jun 5, 2023 at 7:03 AM Josep via Elecraft
wrote:
Hi guys,
just a question.I have recently bought a KPA500 (#0762) in the US.I have
another one at home that a friend of mine built for me in the US.I know the
amplifier works 100-120VAC and 200-240VAC so the question is if I need to
switch some kinda interruptor inside the amplifier.I need
I am the second owner of a very nice KPA500. I have recently replaced the
finals. The amplifier puts out full power on all bands. I am selling it to
fund some microwave EME purchases.
The amp is wired for 240 V ac but it is easily changed to 120 V without
opening the covers. (New ceramic fuses of
"The issue: The fan comes on in a very short time - less than 20 seconds - and
the temp display runs up to 50+ degrees. If I start calling CQ or get into a
QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is
running at max."
Max fan speed of a KPA500 is setting 6.
Hi Jim!
Hope you are enjoying Idaho. I hear it is a great place to be!
The fan in the KPA500 goes to level 3 at 60 degrees. It goes to full-on at 80
degrees.
The levels are:
level 1 - 50C degrees
level 2 - 55C degrees
level 3 - 60C degrees
level 4 - 65C degrees
level 5 - 70C degrees
level 6 -
My K3 into the KPA500 for over ten years . . . . The FAN REV is 1.54
(this might be software)The resting temp is 27C. When on RTTY I set
the FAN to 4. Otherwise 2 for most of the time. Knowing temperature is
the killer of electronics (short of lightning) I try to keep things cool.
For 10
My setup is like yours and the response is exactly the same. Starting use on
fan speed 4 delays the temp rise for a short time. Mine has run many many
hours at temps up to 70 with no problems. Hottest on 20m and requires the
most drive on that band also.
On Sun, May 14, 2023, at 10:23
y, May 14, 2023 12:24 PM
> To: Elecraft Reflector Reflector
> Subject: [Elecraft] KPA500 Fan Question
>
> Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp
> at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which
> in turn is hooke
d that burns energy. That’s why
> the fan is running.
>
>
>
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net On
> Behalf Of James Bennett via Elecraft
> Sent: Sunday, May 14, 2023 12:24 PM
> To: Elecraft Reflector Reflector
> Sub
Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp
at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which in
turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has
provided me with a nice 1.2:1 SWR, as displayed on the amp. The
You could just connect the RF cables and the relay cable and let the KPA/KAT
detect and automatically change bands. It will work very well this way.
John KK9A
William Santos KN6UDK wrote:
Hello gang,
I'm considering purchase of a KPA500/KAT500 combo to use with my FT-710
Transciever.
Under
Hello gang,
I'm considering purchase of a KPA500/KAT500 combo to use with my FT-710
Transciever.
Under the "Cables for non-Elecraft Transceivers" section of the KPA500 Elecraft
web page, the FT-710 is not listed.
1. What cables do I need for a KPA500/KAT500 combo interfaced with a Yaesu
On 3/2/2023 12:14 PM, Ramon Batista wrote:
Prefer Local Pick-Up Or Meet Up To 100 Miles
QTH?
My QRZ Information Is
Up To Date
And your call sign is??
--- Mike N4CF
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*For Sale An Elecraft KPA500-F HF-6M Amplifier & KAT500-F HF-6M ATU. Both
Units Are Factory Built In Like New And Excellent Cosmetic And Operational
Conditions With No Dents, Dings Or Scratches. The Sale Include Original
Boxes With Inserts Power Cables And Accessory Cables To Interconnect
Norstad
Sent: 09 February 2023 15:57
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 failure
Here's another twist that makes me thing it could be a PS issue.
Early this morning, I was hunting down 3Y0J on 10m FT8 (very strong signal
here). WSJT-X was in F/H and S/P mode. I stepped out
Sent: Wednesday, February 08, 2023 4:00 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 failure
A couple days ago, I stepped out of the shack for a few minutes and upon
returning found the KPA500 had shut down. I didnt note any brief power
outage, and Im quite sure it was ON when I
A couple days ago, I stepped out of the shack for a few minutes and upon
returning found the KPA500 had shut down. I didnt note any brief power
outage, and Im quite sure it was ON when I stepped away.
It has been a little quirky in keying since that time. Yesterday it gave
off a funny
Well that's an interesting failure report. I don't see any obvious single
factor except for overheating of the entire PA module.
Was the fan functioning normally, air vents clear, and external airflow
unobstructed?
"Capton tape on the "S" bracket is interesting. Did they mean "Kapton tape on
My KPA500 is on the way back from Watsonville. Just in time for the Bouvet
DXpedition
I am trying to understand what might have caused the problem. Here are the
details.
Problem(s) found:
T/R circuit failure due thermal damaged diode D10 causing damage to traces and
pads on LPF module.
I’m running a K3,KPA500,KAT500 into a 10-80 meter OCFD at ~ 50 ft. It will
tune 40M great but fault on all other bands. This is not a new problem, but
has been going on for a few years. Any ideas what could be causing this? I’m
following the instructions in the tuner manual.
Thanks,Jim
Thanks to Jack for suggesting I take a look at the output cable to see if it
had any issues. Sure enough, when I got the top cover off, the end of the
black wire that comes from the Gnd Output connector on the PA board and goes to
the solder lug on the SO-239 Power Out connector, was staring
1. "The Problem" is almost never caused by "the worst thing that could
happen."
2. Humans will nearly always assume it's "the worst thing that could
happen."
While learning to fly an airplane many years ago, IP told me, "By far,
the reason for landing with the gear up is because you
I got a KPA500 this summer and it was doing a lot of faulting. I had to
"correct" a few things that were just fine at 100 watts.
1: I discovered that a solder joint in the UNUN had gone bad, and fixed
that. That solved most of the faults.
2: With still the occasional fault, I looked again
Amazingly, it is probably not the KPA500.
We have been seeing quite a few inquiries about this. Analysis almost always
shows an issue in the antenna system caused by high power.
There are a few things at play. When measuring SWR (or better, antenna S
parameters) at low power, you will get the
I have pretty much the same symptoms reported by the KPA1500 users here. The
higher the frequency the more likely to see a fault. 10M is the worst one.
The amp shows a 2:1 SWR and that is running it into a tuned KAT500, which shows
1.2:1 and a Daiwa bridge showing 1.1:1 into the antenna.
Thanks, Jack. Yeah, I realized what I did after Walter sent the link. I went
here (https://elecraft.com/pages/kpa1500-kpa500-kat500-remote-software) the
first time and only saw the Windows files. I thought I had seen them for macOS
previously but, for the life of me, I couldn’t find them again.
Joel;
It’s worth the look. We have most apps for both Windows and Mac.
By the way, the KPA500 firmware was developed and is still maintained using a
Mac mini, which is a good
indication as to how important both Windows and macOS are to us.
Welcome to the Elecraft world; we hope you will enjoy
It is right here, under “Macintosh”.
https://elecraft.com/pages/kpa500-500-watt-linear-amplifier-firmware-and-utility
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Dec 14, 2022, at 3:06 PM, Joel Black wrote:
>
> Before I go looking too hard, is there a
Before I go looking too hard, is there a macOS app for the KPA500 or *just* the
Windows app on the Elecraft site.
If it matters, I’m looking to interface the KPA500/KAT500 combo to a Flex 6400…
Maybe. I’ve not bought the amp or tuner… Yet.
My preferred OS is macOS but I do use Win11 in a VM
Greetings,
Working on a KPA 500, #2441. All bands except 40m work properly; 40m output
is about 125w. Testing into a dummy load:
Drive level: ~20w for all bands.
Voltage and current levels all seem normal; lower PA current and slightly
less voltage drop on 40m.
SWR back to exciter (K3s)
Am guessing that toroid transformer is 70% or more of total KPA mass?
Has anyone put it on a scale and remembed its weight?
Be sure to seat and torque bolt properly when putting it back in.
Mike AC5P
On Tuesday, November 22, 2022 at 07:50:22 AM CST, Michael Walker
wrote:
Not really.
Not really.
Just label the wires so you know were to put them when it comes back.
Undo the bolt and pull the big torroid out. You'll notice the KPA500 is a
lot lighter now. :)
73, mike va3mw
On Tue, Nov 22, 2022 at 6:42 AM wrote:
> I am sending my KPA500 to Watsonville for service. The
I am sending my KPA500 to Watsonville for service. The shipping instructions
say to "remove the transformer unless otherwise instructed."
Are there any instructions for transformer removal? I've looked at the
assembly instructions and it seems straightforward.
Are there any potential pitfalls
PS: Only the mains line is aluminum and connections treated with
antioxidant paste. All new wiring in the new hamshack is copper (12-2
for 120vac and 10-3 for 240vac).
The 3000w Meanwell 50v PS is served with a short 10-3 line to a 30A
twist-lock receptacle in a floor mounted utility box
"It can't be solved. The SSB and/or Data at that AF MARS frequency is just
slightly below the band pass filter change over to the 5.3 bandpass filter
on the KPA500. That means that when you are on SSB, part of your rf envelope
crosses over to the 5.3 band filter which causes the amp to switch to
n...@mailman.qth.net On
Behalf Of Joe Rogers
Sent: Monday, November 14, 2022 21:00 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500 Shifting Bands without any change in K3 Frequency
I am operating the KPA500 KAT500 power combo with the K3. The combination
works great and normally makes f
Have you tried putting the KAT500 into MAN mode (not bypass or AUTO)?
Once trained for bands (memory loaded), MAN is the best way to use the
tuner. It'll recall the tuning combination but won't go into auto-retune.
73,
Rick nk7i
On 11/14/2022 6:00 PM, Joe Rogers wrote:
I am operating the
I am operating the KPA500 KAT500 power combo with the K3. The combination
works great and normally makes frequency and antenna changes really simple. I
operate on MARS frequencies and normally all works just fine outside of all the
amateur bands with the KPA500/KAT500/K3 there is, however,
on their capital investments.
73
Lyn, WØLEN
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, November 14, 2022 5:20 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
On 11/14/2022
On 11/14/2022 2:08 PM, Lyn Norstad wrote:
Aluminum does not meet any current (pun by chance ...) building codes around
here.
I don't know what Chicago Codes are like now, but Comm Ed pulled Al
conductors to my meter when I requested 100A service, and they refused
to pull Cu. This would have
Yes ... both. Go look for yourself.
Flexible cords like line cords are almost never aluminum ... I assume
because line cords use fine stranded wires and if I'm not mistaken
copper is more ductile than aluminum.
Dave AB7E
On 11/14/2022 3:42 PM, Lou Mecseri wrote:
BUT NOT BOTH.
How
Aluminum was legal at one point, as I recall it was the 80's (copper
prices were obscene). It was an expensive mistake to allow aluminum wiring.
I attended some fires as a result of aluminum wire (career firefighter,
eventually Captain). My suspicion was that as switches and plugs were
BUT NOT BOTH.
How about line cords?"
Lou KE1F
On 11/14/2022 22:32, David Gilbert wrote:
There is absolutely nothing inherently wrong with aluminum wire, and
it is typically what is used for very large gauge wire ... even for
the utility entrance in my location. I would bet that if you
: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
On the general subject of house wiring, loads, and resulting voltage:
I am wiring my new hamshack with 240vac mains extension from the house.
I selected three No. 2 awg aluminum lines (copper not commonly used
these days). These are
There is absolutely nothing inherently wrong with aluminum wire, and it
is typically what is used for very large gauge wire ... even for the
utility entrance in my location. I would bet that if you look closely
at your breaker box you will see the same for the main feed coming in
unless
When my younger brother was finally out of the house for good, Mom and
Dad bought a double-wide, sold the house in So. Central LAX, and moved
south into a "Mobile Estates Park" in Costa Mesa. The wiring was Al.
About 3 years later, they had a problem in one of the outlets that
involved a
On 11/14/2022 1:43 PM, Ed Cole wrote:
That is rated for 90A (in general). Resistance is 0.318 ohms/1000-feet
so my 120-foot run has 0.0382 ohms. At 50A this results in a voltage
drop of 1.9v. My service voltage is 243VAC.
It's important to realize that current on AC mains is FAR from being
...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ed Cole
Sent: Monday, November 14, 2022 3:43 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
On the general subject of house wiring, loads, and resulting voltage:
I am wiring my new hamshack with 240vac
On the general subject of house wiring, loads, and resulting voltage:
I am wiring my new hamshack with 240vac mains extension from the house.
I selected three No. 2 awg aluminum lines (copper not commonly used
these days). These are approx 1/4-inch diameter.
That is rated for 90A (in
craft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, November 14, 2022 12:37 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
On 11/14/2022 6:38 AM, Lyn Norstad wrote:
> I had mine set up, as Rick sugges
On 11/14/2022 9:36 AM, Jon Poland wrote:
My 12 year old house has 200 amp service. I don't know why. But since
building it, we have shifted to 90+% LED lighting, high efficiency
dishwasher, fridge, and clothes washer. My entire lighting load at any
given time is less than 120W. A smart
On 11/14/2022 6:38 AM, Lyn Norstad wrote:
I had mine set up, as Rick suggests - but when it was in for service, they
dropped it back a notch saying it was too high.
That's the difference between their mains wiring and yours. I'd stick
with what is highest, within range, at your QTH.
73,
lman.qth.net>
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Rick NK7I
> Sent: Saturday, November 12, 2022 1:03 PM
> To:elecraft@mailman.qth.net <mailto:to%3aelecr...@mailman.qth.net>
> Subject: Re: [Elecraft] KPA500 Voltage?
>
> I'd
elecraft-boun...@mailman.qth.net [mailto:
> elecraft-boun...@mailman.qth.net] On Behalf Of Rick NK7I
> > Sent: Saturday, November 12, 2022 1:03 PM
> > To:elecraft@mailman.qth.net
> > Subject: Re: [Elecraft] KPA500 Voltage?
> >
> > I'd move it up one tap as long a
...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Rick NK7I
Sent: Saturday, November 12, 2022 1:03 PM
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
I'd move it up one tap as long as it does NOT EXCEED 85V at receive.
Higher voltage not only gives you better
] On Behalf Of Rick NK7I
Sent: Saturday, November 12, 2022 1:03 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 Voltage?
I'd move it up one tap as long as it does NOT EXCEED 85V at receive.
Higher voltage not only gives you better output but also cleaner. That
matters too.
73,
Rick
On 11/13/2022 10:52 AM, Andy Durbin wrote:
Note that the drop is not related only to power output but is a function of
total PA input power
It's also a function of IR drop in ALL of the AC wiring between the
distribution panel and the amp. In North America, building codes call
for at least
"My KPA500 is showing 57-58 VDC at 450-500 watts out, and 71-72 VDC on rx."
That's a much smaller spread than I see with my KPA500. Are you powering from
240 VAC or 120 VAC? Running on nominal 120 VAC I have my RX PA volts currently
reading 81.8 and it still sometimes sags just below 60 V on
I'd move it up one tap as long as it does NOT EXCEED 85V at receive.
Higher voltage not only gives you better output but also cleaner. That
matters too.
73,
Rick nk7i
On 11/12/2022 10:25 AM, Gordon LaPoint wrote:
My KPA500 is showing 57-58 VDC at 450-500 watts out, and 71-72 VDC on rx.
My KPA500 is showing 57-58 VDC at 450-500 watts out, and 71-72 VDC on rx.
Is this normal or should I move up one tap?
Thanks,
Gordon - N1MGO
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Help:
I have to thank the folks at Elecraft design... I was running a full
500 watts out of my KPA500 this morning, when we took a power hit,
during transmit! AC Line dropped, then came back on line, and dropped
again, then returned again... Not a clean power fail. Once the power
came back on, I
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