Was there a satisfactory answer given for this issue? I don't notice the
problem of limited power on 10-20 meters but on 40 it shows up. Several
kick starts are required to see full power then it's smooth sailing.
I see adequate ALC and am driving the amp with ~25 watts from my K3. Kicking
up K3
I don't recall seeing an answer go by. I don't observe this anomaly,
however I'm pretty much a CW operator. I do notice that, if I've had
the power set to just light up the 500W LED and then turn the entire rig
off, when I turn it back on, the 550W LED will light up when I first
touch the
Hi Fred,
The situation you are describing (first touch of the paddle) is an indicator
that the K3 TX Gain might need to be touched up on one or more bands. Do the
calibration from the K3 Utility and if that doesn't do the trick look at the
fine tune instructions on the top of page 62 in the K3
Just guessing here, some elucidation on why you want to remote would be
helpful.
There are some number of reasons to run the KPA and KAT (near where the
coax comes into the house?) in the basement. One is not having a long
ground attached to the amplifier, putting RF on a lot more of the house.
CORRECTION:
I asked a question about running the K3 in my 2nd floor shack and putting the
amp and tuner in the basement, HOWEVER, I didn't catch my typo in the original
message.
I want to put the KAT 500 and KPA 500 in the basement and have the K3 in the
2nd floor shack.
How can I do this?
John,
I guess my question is why would you want to? You're going to have coax
loss either way, and while you might get some benefit in having the
tuner and amp closer to the antenna, I'm not sure it'd be worth not
having the $2200 amp and $600 tuner in the shack.
73,
Scott, N9AA
On 5/27/12
I just bought the KPA 500 amplifier and would like to know if someone on this
group has used it
with the Icom 7000 with aux port cable to the Icom 13 pin connector. If so I
would like to make
my own cable since I have a spare 13 pin connector. Any information on this
setup would be
Page 13 of the KPA500 manual explains this. You need to change the Radio Menu
selection from K3 to BCD. That will disable attempts to communicate with a K3
and enable the band buttons.
Jack B, W6FB
Elecraft Engineering
On Apr 8, 2012, at 9:18 PM, WA6KEK wrote:
Thank you very much for the
Sent: Mon, Apr 9, 2012 14:52:38 GMT+00:00
Subject: Re: [Elecraft] KPA 500 Band buttons inop while rig is connected to
Aux port
Page 13 of the KPA500 manual explains this. You need to change the Radio
Menu selection from K3 to BCD. That will disable attempts to communicate
with a K3
I made up a cable to go from my FT-2000 Band Data port to the Aux port of the
KPA500. It works perfectly; changes bands on the KPA when I change them on
the Yaesu and keys the amp too without the need for a line to the PA KEY
port on the amp.
While set up this way, the band buttons on the KPA are
Hi Alan,
This note is on page 9 of the KPA500 manual. Two way control only occurs
with a K3.
Band switching control in which the KPA500 follows the transceiver band
selection without
transmitting is available with other popular transceivers such as Icom and
Yaesu with the
appropriate
Thank you very much for the response Mike. I had a clear understaning going
into this that the KPA was not going to send data to my rig. It was just not
spelled out that the band buttons would be inop. It certainly makes sense
that they would be.
73 Alan WA6KEK
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Hi All,
Still assembling my KPA-500 SN 436
I am at the stage of installing the transformer and actually have installed the
transformer. Upon close inspection it appears that the front left (as viewed
from the front) foot held to the chassis bottom using pan head screws may cause
damage to
Hi All,
Still assembling my KPA-500 SN 436
I am at the stage of installing the transformer and actually have installed the
transformer. Upon close inspection it appears that the front left (as viewed
from the front) foot held to the chassis bottom using pan head screws may cause
damage to
I think that you have put the screws in
the wrong way. See page 8 of the
Assembly Manual, particularly the bold
type sentences.
73, Ken K3iU
On 3/27/2012 2:42 PM, Dave Anderson,
K4SV wrote:
Hi All,
Still assembling my KPA-500 SN 436
I am at the stage of installing the transformer and
Oops... sorry, Dave. I see now that you
said that the interference is with the
head of the screw which is correctly on
the inside of the bottom cover. I have
assembled 2 of the amps and have noticed
this problem.
73,
Ken K3iU
On 3/27/2012 3:08 PM, Ken Wagner K3IU
wrote:
I think that you
Hi Dave,
A quick Google search indicates that the KPA500 has been used on at
least 5 DXpeditions that I've found: T2T, HK0NA, 5V7V, ZD8D, and J68/W0MU.
Since the amp was designed specifically for that purpose in my, I'd be
surprised if the design team let a potential issue like that survive the
I think one important matter is being overlooked - when properly
installed, the transformer will not move. The fact that the screwhead
is touching the plastic wrap on the transformer is likely OK. If things
do not move about, that spacing should stay the same.
73,
Don W3FPR
On 3/27/2012
I'm looking for the manual in Spanish KPA 500, someone can help me?
Siso HK3W
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Post:
Interesting. I have build 600W amp with four Motorola MRF150 transistors and I
can easily
get 600W output with 7W input. This was tested with input attenuator removed.
Are those Mosfets in KPA500 that much different?
I also would like to purchase the KPA500 but only if I could get 15 dB gain.
It
On 3/16/2012 9:59 AM, mark roz wrote:
Interesting. I have build 600W amp with four Motorola MRF150
transistors and I can easily get 600W output with 7W input.
Well, after a little more research (finding the KPA-500 schematics on
the FCC web site) ... there is a fixed attenuator between the
Olli,
Would adding a low gain broadband linear amplifier between the KPA500's
input and the 10 watt driver be a useful alternative to modifying the
KPA500?
I assume that during receive this amplifier would have to be bypassed.
73,
Geoff
LX2AO
On March 15, 2012 at 23:32 +0100, Oliver Dröse
Removing this part of the circuit will definitely void the warranty. It
is part of both the input overdrive protection for the amp and also
stabilizes the input SWR as seen by the driving radio. It's also
important for amplifier stability.
We also check for excessive gain in the amplifier's
16, 2012 5:09 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
Olli,
Would adding a low gain broadband linear amplifier between the KPA500's
input and the 10 watt driver be a useful alternative to modifying the
KPA500?
I assume that during receive this amplifier would have
Thanks for the inside view, Eric! Much appreciated.
73, Olli - DH8BQA
- Original Message -
From: Eric Swartz - WA6HHQ, Elecraft e...@elecraft.com
To: Joe Subich, W4TV li...@subich.com
Cc: elecraft@mailman.qth.net
Sent: Friday, March 16, 2012 6:09 PM
Subject: Re: [Elecraft] KPA-500
Hi,
Is it any simple way to modify KPA to drive full power
with KX3? I see VRF2933 have minimum 20 dB gain.
Looks like killer combination.
I know there is some PA gain rectrictions in US, but
many of us are not covered by it ;)
73
Arunas LY2IJ
responsibilities and tighting ourselves to non-disclosure to get the
schematics. ;-))
Vy 73, Olli - DH8BQA
http://www.dh8bqa.de/
- Original Message -
From: Arunas LY2IJ ly...@qrz.lt
To: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 7:42 PM
Subject: [Elecraft] KPA-500 high gain
On Thu, 2012-03-15 at 21:54 +0100, Oliver Dröse wrote:
...
Three big reasons I can think of that Elecraft does not want to release the
schematics:
a.) To keep them hidden for the competition (quite understandable).
b.) It would probably put down sales of the KPA3 a bit (hmmm).
c.) If
it for 10 watts drive for full output!
73, Olli
- Original Message -
From: Alan Bloom n...@sonic.net
To: Oliver Dröse dro...@necg.de
Cc: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
On Thu, 2012-03-15 at 21:54
...@necg.de
Cc: elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain modification?
On Thu, 2012-03-15 at 21:54 +0100, Oliver Dröse wrote:
...
Three big reasons I can think of that Elecraft does not want to release
the
schematics
in a heartbeat if I knew I could modify
it for 10 watts drive for full output!
73, Olli
- Original Message -
From: Alan Bloomn...@sonic.net
To: Oliver Drösedro...@necg.de
Cc:elecraft@mailman.qth.net
Sent: Thursday, March 15, 2012 10:58 PM
Subject: Re: [Elecraft] KPA-500 high gain
Just finished my build and it went together beautifully. My 220 socket is
wired like a dryer 220 socket so I removed the plug from the cable (OK per Dale
at Elecraft0 and installed a 220 plug for the socket. When I start it up the
HV reads .1 (yes, point one) and 0 current. Could I have the
Cary,
You use a Dryer plug! While that is overkill for the KPA500, it is
definitely OK.
If you cut the 120 volt end off the power cable, you will have a white,
a black and a green conductor. The white and the black wires should
connect to the hot 240 volt connectors in your plug, and the
KPA-500 #698 arrived, fittingly, on Valentine's Day...today.
Can't wait to begin the build tomorrow as a City Council work session and
meeting tonight preclude beginning that today - I'll try to be patient!
73,
Cary, K4TM
LYNCHBURG VA
H. Cary III
h3c...@gmail.com
Hi,
I bought a kit in October last year and only assembled it recently.
Assembly procedure is straight forward as described in manual.
The first thing I noticed was that the amp was not always amplifying
properly while the transceiver was in transmit mode. '*' sign was always
visible when
Hi Bernd
Are you sure you didn't push the On button by mistake ? The two are not
very far apart.
I have been using my KPA500 since September last year and have had no
problems.
73
Barry Simpson VK2BJ
2012/2/10 Bernd Länger vk...@vkcc.com
Hi,
I bought a kit in October last year and only
Just received the email shipping notification from Elecraft - my KPA-500 is on
its way and is scheduled to arrive on Valentine's Day. What a great present!
73,
H. Cary, K4TM
LYNCHBURG VA
h3c...@gmail.com
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Congratulations! I built mine last week! Very nice! 73s Gene
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Congrats! I just completed #666 as of 1/31/2012! Great little amp!
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666...do you have to use that one with horn antennas?? (Yes, weak attempt at
humor. Devil made me do it...)
73,
Mike ab3ap
On 02/03/2012 11:48 AM, Forest Summers wrote:
Congrats! I just completed #666 as of 1/31/2012! Great little amp!
No horns, but the are pointed! I affectionately call this amp, The Beast.
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On 1/28/2012 7:30 PM, Don Wilhelm wrote:
I just cannot unserstand how the KPA500 can create birdies during
periods of receive.
Don,
When thinking about sources of RF trash, remember that ANY oscillator or
microprocessor or any other piece of digital circuitry generates RF
trash as a
KPA 500 Serial # 635 kit now working after about 6hours of fun putting it
together.
73
Karl VK2GKA
K3,P3,KPA500
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Help:
G'day all.
I have a KPA 500 Sn 423 and have discovered birdies every 10khz or so on 20
thru 6m, worst on 10m indicating about 1 s point on the ft1000 mk v field.
I have checked for external sources, earth loops, wall warts etc.
The noise is present when there is something plugged into the output
Contact Dale at Elecraft support...I had the same problem and it turned
out to be a bad cap on the board behind the front panel. they sent me a
replacement board right away.
A way to check it is go into the menu on the KPA500 set the LED BRT to
DAY and see if the birdies go away. if so
OOPS that should be LCD BRT ( not LED )
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Steve,
I just cannot unserstand how the KPA500 can create birdies during
periods of receive.
I would you suggest that you look for other potential problem sources
such as loose PL-259 connectors.
73,
Don W3FPR
n 1/28/2012 8:44 PM, Stuart Dunk wrote:
G'day all.
I have a KPA 500 Sn 423 and
I was presently surprised my Tennadyne T-14 log periodic accepted the KPA 500
with ease from 10.1 thru 28.8 MhZ with the K3 without a tuner. 73. Mark W9OP
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Hi Guys,
Wondering if anyone has tested their KPA-500 on both 120v. and 240v. and
documented the following:
1) When operating on 240v. was the PA voltage under load the same, higher,
or lower than when operating at 120v.?
2) When operating on 240v. was the same, less, or more drive
Dick,
Any differences between the 120 and the 240 volt AC input have more to
do with the wiring between the breaker panel in the house and the
hamshack. Length of wire, wire size, tightness of the connectors and
receptacles. Twice as much current is drawn at 120 volts vs. 240 volts,
so the
Taps on the power transformer ensure the amplifier sees exactly the same
voltage to the RF power amplifier module, no matter which mains voltage is
used, as long as you select the tap as described in the Owner's manual. So
there is absolutely no difference in the voltage, drive or temperature.
On 12/27/2011 1:27 PM, Don Wilhelm wrote:
or any particular DC PA voltage, there should be no difference in drive
level or heat dissipation, so that depends on how the user has set the
transformer tap rather than the AC input voltage.
Because the KPA500 power supply is not regulated, the total
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Tuesday, December 27, 2011 7:08 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-500: 120vac vs. 240vac
On 12/27/2011 1:27 PM, Don Wilhelm wrote:
or any
KPA500 #618 arrived yesterday afternoon, I put it together this morning
and got it on line with no problems. It went together like a charm and
it works great. I am amazed at how well it works and how quiet it is,
the silent QSK is a thing of beauty. Only thing left to do it set up the
per band
My KPA500 kit that came about a week ago, came with 1/4 4-40 screws for the
Z bracket that should correct the popping.
John N1JM
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Are the latest KPA-500 now sent with the POP repaired?
73, Claude VE2FK
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This
I get an occasional mild pop but not the loud pops as others report.
Mine was factory built. The noises are nothing like hearing a spider or
ant getting zapped in the old SB 220. Actually the clicks remind me the
amp is on. It's so quiet otherwise.
K9IL
Thank you for all replies and suggestions. I will email Elecraft on monday
and buy a new cable with the proper connectors.
I have removed the blockage and finnished assembly of the KPA-500. I would
like to test it! :-)
Does any one out there uses a Kenwood TS-590S with the KPA-500? I would need
Finally i received my KPA-500 amp kit s/n 564,it took 10 days to arrive in
Tn.The build when straight forward and it worked without any problems.I
have powered it with 240 and 120 volts no differance in power out.The Brown
truck must of gotten lost in the mountains.Good luck to all the KPA-500
Hello everyone,
I was just about ready to assemble the front panel, when I realized the
connector on the 40 pin cable has one position blocked. If one follows the
assembly manual instructions (the red cable to P1...) you cannot plug in the
cable because the blockage is on the wrong side.
I would
I experienced a similar problem with my KPA500 ribbon cable. After an
unsuccessful attempt to remove the plugs, I contacted Elecraft Technical
Support and the correct ribbon cable was shipped to me.
Daniel
W0OTV
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Manuel,
With ribbon cables, that condition can mean that you have the two ends
swapped.
It also can mean that you have a cable with the plug in the wrong hole.
73,
Don W3FPR
On 12/3/2011 2:47 PM, manueldeportugal wrote:
Hello everyone,
I was just about ready to assemble the front panel,
Well after a couple of days of making sure the ALC is 5-7 bars, I still have
significant power creep especially on 12 meters.
I can take several CQ sequences before the power gets to the rated value.
Are there any other ideas?
--
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A similar phenomenon here but not every time. Typically it happens when the
amp is cold (eg having been off overnight) the rear power switch is off and
I switch it on, followed by the front ON switch, then go to Operate. As with
Roger, cycling the front power switch clears it. No key cable by
Guys;
This problem is typically caused by the K3's TX INH input being enabled. Be
sure that the Config:TX INH menu setting is set to OFF.
I emphasize, this is a K3 setting, not KPA500.
Jack Brindle, W6FB
On Nov 25, 2011, at 4:55 AM, Geoffrey Downs wrote:
A similar phenomenon here but not
Thanks for the suggestion Jack but TX INH is set to OFF here.
No doubt the solution will be simple but I haven't found it yet.
73 to all.
Geoff
G3UCK
K3 #266
-Original Message-
From: Jack Brindle
Sent: Friday, November 25, 2011 1:59 PM
This problem is typically caused by the K3's TX
Hi Jack,
Thanks for the info, but TX INH was also off in my K3 as well. Something
else appears to be causing this. Thanks again. Roy W4WFB
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Help:
I don't have a KPA500, however, I did have an occasional problem with
the K3 on power up. If I pressed the K3 power switch too quickly after
switching on the PSU (switch mode) sometimes the K3 would lock up part
powered. If I delay pressing the power switch for 3-4 seconds all is
OK.
I think I found the culprit thanks to the mention of no key cable connected
when using the KPA-K3 AUX cable. (I already checked the TX:INH item and
it was OFF)
I had my key cable connected to both the K3 and KPA despite also having the
AUX cable between the two.
I had left it connected ever
Roger, MW0IDX
Do you have the KEY Cable and the KPA3AUX cable BOTH connected between your
K3 and KPA500? Jeoff, G3UCK is using the KPA3AUX cable only. As I
understand it, on occasion he is still having no KPA500 RF until power is
recycled. I am trying to find out if eliminating the KEY
FWIW: I use the heavy cable between the K3 AUX and KPA500 DB15 and
nothing else. It always makes RF. I haven't shut the back panel power
switch off since I first turned it on, however.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
-
I have the same problem with mine, too (SN#0250).
What I do is switch back and forth between a couple of bands with the band
buttons and then it's fine.
I made it into a habit whenever I turn the amp on so I can QRV as soon as I
want to and not have to fiddle with it when trying to snag a DX
Tonight I also experienced the KPA-500 not putting out power in SSB mode
while the amp was in OPERATE mode. All parameters in the amp were normal.
The K3 set power output correctly indicated 39 watts. With the amp in
STANDBY mode the power went correctly to 100 set watts. I put the amp in
-
From: Roy Morris
To: elecraft@mailman.qth.net
Sent: Friday, November 25, 2011 3:33 PM
Subject: [Elecraft] KPA-500 no RF until power cycles
Tonight I also experienced the KPA-500 not putting out power in SSB mode
while the amp was in OPERATE mode. All parameters in the amp
Hi,
I check that tonight.
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This came up a while back but I haven't seen any answers yet.
When going into operate there is no power output, no lights (asterisk OK).
Switching the power button off then on again and placing it into
operate, it works fine..Happens every time.
Any clues on how to fix this will be gratefully
Well I did the TX gain calibration. Any other ideas? It can take 10-15
seconds to get the full power out. I thought solid state amps were
immediate?
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Sent from
They are. There's nothing in the KPA500 that can cause a delay in gain
ramping up, so it *must* be in the drive from the K3. And that, as far as I
know, is always a TX Gain calibration problem.
Suggest you contact K3support (at) elecraft.com for more help.
In your shoes, I'd try the TX gain
Do you have the mic gain set so it provides 5 to 7 bars on the ALC
meter? If not, you are not driving the audio hard enough and the power
creep you are experiencing is normal for that situation - with low
audio, the K3 will power hunt to try to bring the power output up to
whatever was
Thanks for the info. I will try the tx gain calibration.
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I noticed that my KPA500 does not always give the full power that it is set
for. For example, if I turn it on,put it in operate and then transmit my
call sign (in a pile up), the first few transmits are lower in power (around
50-100 watts) and it takes 7 or 8 of these before the power gets to
On Sun, Nov 6, 2011 at 8:20 AM, tomb18 tom...@videotron.ca wrote:
the first few transmits are lower in power...
Tom, I believe that someone mentioned in an earlier thread that symptoms
like this can be cured by doing the TX Gain calibration with the K3 utility
program.
Tony
Tom,
I believe the source of that situation is in the K3. Run the TX gain
calibration to see if that helps.
There will always be some remnant of that behavior because of the way
the K3 controls power output, but the time for it to come up to full
power should be relatively short - a few
Hmmm ... mine is set on peak-hold 500W, and on the first dit on a new
band, it usually lights the first yellow LED. After that, it just goes
to 500.
Fred K6DGW
TDY Sparks NV
On 11/6/2011 2:20 PM, tomb18 wrote:
I noticed that my KPA500 does not always give the full power that it is set
for.
Ditto here in VR2. Cool and quiet.
TNX 73,
Johnny VR2XMC
從︰ KD3RF avav...@verizon.net
收件人︰ elecraft@mailman.qth.net
傳送日期︰ 2011年10月30日 (週日) 8:42 AM
主題︰ Re: [Elecraft] KPA 500 CQWW flawless performance
We are now 24 hours into the contest and the KPA 500
True, I use kpa500 as well. 28mhz seems very good
Sent from my iPhone 4
KD3RF avav...@verizon.net 於 2011年10月29日 下午1:46 寫道：
A thank you to the Elecraft team for the excellent engineering and
performance delivered in the KPA500.
Team VE2DXY contest DXpedition from zone 2 is using a KPA500
We are now 24 hours into the contest and the KPA 500 is perking right along
with no issues just keeps pumping out the watts and running cool.
We brought it on the VE2DXY DXpedition to give us the ability to band-hop
and chase multipliers and it's really helping our score.
It's been running
A thank you to the Elecraft team for the excellent engineering and
performance delivered in the KPA500.
Team VE2DXY contest DXpedition from zone 2 is using a KPA500 in the CQWW SSB
contest with absolutely flawless performance from this fine amplifier.
Been hammering it hard for more than 8 hours
Well after a month I finally opened the box and got the manuals out in
anticipation of starting to assemble the kit. Looks straight forward and easy
to assemble.
However one thing did strike me as odd in the assembly. It was the lack of any
heat sink compound on the IC's on the Power Supply
Hi Bob,
There is an insulating, heat conductive, pad on the LM317 fan control, the
device closest to the rear panel. The other two do not dissipate enough
power to require heatsink compound. However, if it makes you more
comfortable, it will do no harm.
73,
Bob, N6CM
On Wed, Oct 12, 2011 at
.
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Is the KPA-500 500W PEP? or DC input to the finals?
Thanks
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:12 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA-500
Is the KPA-500 500W PEP? or DC input to the finals?
Thanks
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Output
-
Chuck, KE9UW
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Hello OM,
For those who suffer from 'hum' (I solved my problem already), please
contact supp...@elecraft.com
Gary and his colleague will always be glad to help.
TNX 73,
Johnny VR2XMC
從︰ Leigh L. Klotz Jr WA5ZNU le...@wa5znu.org
收件人︰
Noted that my new amp is making a fairly loud humming noise when not under
load, and a much louder hum when under full power. New thing, have not heard
this before, power output still good, but noise is really concerning. Removed
top, nothing loose, should I try retorting the xformer hardware
Check the other case screws, particularly the ones holding the left side
panel (the panel with the feet closest to the transformer). Unlike the K3,
the KPA500 uses steel panels for greater strength to support the
transformer. They, of course, want to vibrate from the magnetic field
leakage around
My question is
Would it be easy to take out the transformer of an assembled amplifier? It is
too heavy to hand carry on a flight so I would like to ship the transformer on
its own.
73 de Ben
SM6CKU
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傳送日期︰ 2011年09月21日 (週三) 9:47 PM
主題︰ [Elecraft] KPA-500
My question is
Would it be easy to take out the transformer of an assembled amplifier? It is
too heavy to hand carry on a flight so I would like to ship the transformer on
its own.
73 de Ben
SM6CKU
Hi,
My KPA-500 watt meter and my Palstar watt meter read about the same at the
higher power readings. But at the 100 watt and lower ranges there is a
significant difference. My question is which is the more correct reading at the
lower ranges, the Elecraft or Palstar. If I want to calibrate
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