sounds like something is causing the 60V power
supply to stay on. Just to make sure, is this what you are saying?
Did you recently open up the KPA, move cables, or anything like this?
Jack Brindle, W6FB
Elecraft Engineering
On Jul 20, 2014, at 7:40 AM, T Gahagan wrote:
> I’m wondering if any
Gary;
Be sure that the K3 is still set to output the data to the KAT500 over the
Auxbus.
On the K3, go to the KAT1 menu and tap the [1] button to toggle this setting on
or off. If it has accidentally
been reset to Off, you won’t get the info from the K3. This procedure is better
described on p
persistent,
not recovering as you indicate. So far
I am not seeing anything that indicates the problem is in the KPA. Please run
the above suggestions. I am very
interested in the results.
73,
Jack Brindle, W6FB
Elecraft Engineering
(sent a second time trying to get the email list to accept the email
A TR switch failure would affect all bands. This one is a bit different. It
will be interesting to see the cause when we finish troubleshooting.
Jack Brindle, W6FB
Elecraft Engineering
Sent from my iPhone
> On Nov 16, 2016, at 12:04 PM, Arie Kleingeld PA3A wrote:
>
> This might be
current fault dump using the KPA Utility I will analyze it to see
what it might reveal. I don’t know if you can get that remotely, but it is
worth a try.
73,
Jack Brindle, W6FB
Elecraft Engineering
> On Nov 22, 2016, at 7:31 AM, Michael Walker wrote:
>
> Not an SWR issue. I can see the S
Page 18 of the KPA500 manual contains a table with the connections you need to
make (and the pins you shouldn’t connect).
If you see conflicts with the DIGOUT1 causing the KPA500 to be disabled you may
wish to remove the pin 11 connection.
73,
- Jack, W6FB
> On Nov 22, 2016, at 9:37 AM, NOEL
Peter;
If you haven’t done so already, I strongly suggest you post this query to the
N1MM reflector.
You may get a good response here, but that reflector is the place for N1MM
questions, and I’d
bet you will get a quicker response in that forum.
73 & hope to Q in CWWCW!
- Jack, W6FB
> On Nov
Phil;
How would you switch between the radios? Manual switch?
Be sure you also connect that you provide some method for cutting power on the
transmitter when the KAT is tuning. This is built into the K3/KPA setup, but
you also need to do it for the IC706.
You really don’t want to hot-switch the
Have things really changed?
I think you will find most, if not all, of us lurk on the list. Some are more
active than others.
- Jack Brindle, W6FB
Elecraft Engineering
(i.e. Product developer)
> On Jan 7, 2017, at 2:36 PM, Jim Rogers wrote:
>
> Does anyone remember the good old d
At this point in the solar cycle, we are already seeing the MUF drop below both
40 and 80 meters at night. Of course that is in the winter time,
and things should get a bit better as we get closer to summer. Still, for the
near future the higher bands won’t be very effective. During the
(rather l
Bill;
To be fair, we have had one instance of the problem, and that station was
running the battery critically low. In fact the battery failed at that voltage
(something like 10 volts) and had to be permanently removed from service.
Perhaps the answer is to take the battery manufacturer’s advic
Be sure to call first to let them know you are coming. Otherwise they may not
have the right people to help you.
Don is now of our excellent support guys. I would be greatly surprised if he
couldn’t help more quickly.
One other tip - it is far easier (and better) to use the K3 Utility to perfor
As I recall, it is a standard LS TTL style open-drain driver, which means it
has a fan out of about 10 LS loads. You should be able to connect several
devices. Be sure they do not have pull-ups that are connected to higher that 5
volts (some band decoders have pull-ups to 12V). The K3 has intern
Download the manual from the Elecraft web site. It has descriptions and
schematics that should help a lot.
Any specific details you’d like to know?
- Jack, W6FB
> On Mar 23, 2017, at 8:34 PM, Lane
> wrote:
>
> Looking for any documentation on the Directional Couplers, 1.8-54MHz
> 200W and 2K
switch the KAT500
to bypass mode so I can take a look at the real antenna match (and appreciate
the work of the KAT500).
Hope this helps - If you have any W2 questions I’ll try to answer them.
73,
Jack Brindle, W6FB
Elecraft Engineering
>
> On Mar 23, 2017, at 9:21 PM, Lane
&
Yeah. That was released back in 2012. What goes around comes around…
But two buttons? We do it much better with just one!
- Jack, W6FB
> On Apr 1, 2017, at 9:36 PM, Ken Arck wrote:
>
> Note today's date... April 1st
>
>
> At 09:14 PM 4/1/2017, Vic Rosenthal 4X6GP wrote:
>> And it even does S
I believe Jim’s “BUT —“ is something being overlooked by a lot of folks here.
The fact is that the It certainly enters into the situation as a major
contributor since the antenna does extend onto the feedline for end-fed
antennas (all the way to the radio!). Essentially, everything that is not
25 amps at 14 volts is 350 watts. That is an awful lot for a radio that is
supposed to be putting out only 20. I would expect at most 2 to 3 watts drain
at 20 watts TX output. Something is definitely going on here.
may load While I don’t suspect the antenna, have you tried testing into a good
50
Thee is an issue with the cheaper solar controllers - they tend to place the
switching transistor in the ground leg, making connections difficult. For
example the Sunforce controller that Jim mentions uses an N-channel FET as its
pass transistor, in the ground lead. If you then connect the radio
Fred’s assessment is correct - the output power resolution below 25 watts is
pretty low. But it is still putting out power, at least to a point. There _is_
a lower limit to input power - it involves the ability of the frequency counter
to do its job. If the counter cannot get an accurate count,
Nope. You need to check the aux io cable. I would bet the power-on pin is
connected on both sides. It should not be. Fix that and the KPA should behave
normally.
Jack, W6FB
Sent from my iPhone
> On Jul 6, 2016, at 12:02 PM, Wes Stewart wrote:
>
> This has bothered me since I got my KPA500 bu
things will
be connected improperly on the KPA500 (or the K3) which will give very
unpleasant surprises.
- Jack, W6FB
> On Jul 6, 2016, at 2:59 PM, Wes Stewart wrote:
>
> Thanks. I use a VGA cable, modified by breaking off the unneeded pins. I
> missed one.
>
> On 7/6/
facilities to do so…
73!
Jack Brindle, W6FB
> On Aug 7, 2016, at 5:21 PM, Dauer, Edward wrote:
>
> I appreciate your having written, Cliff; and it is the case that 30 meters is
> an oddball. Just as the K3 is booby-trapped to prevent transmitting out of
> band, it could very well
issue.
73!
- Jack Brindle, W6FB
Elecraft Engineering
> On Aug 12, 2016, at 7:23 PM, Jorge Mejia P wrote:
>
>
>
> Para: Elecraft@mailman.qth.net
> Asunto: Kpa 500 problem when auxiliary cable connected ...
>
> I had been successfully using my KPA500 with an Icom and
Oops. That should be the RADIO setting in the KPA500…
- Jack, W6FB
> On Aug 12, 2016, at 8:14 PM, Jack Brindle wrote:
>
> Make sure the RADIO setting in the K3 didn’t get changed away from K3. More
> specifically, it sounds like it was changed to ANALOG without having the
For the record, the error message refers to the KAT500, not the KPA500. The
issue is caused by a device pulling down the Auxbus because it is powered off.
You may see it with just about any device that uses this communication bus,
except the KPA500.
Quite simply, the KPA can talk on the bus, b
Likewise make sure the K3 output power for 40 meters, for the KPA if you have
the per-band power set, has not been somehow set to zero.
- Jack, W6FB
> On Sep 17, 2016, at 5:51 PM, Guy Olinger K2AV wrote:
>
> If you have the KAT3 in the K3, make sure you haven't accidentally changed
> the outpu
continues to improve with each firmware
release.
Jack Brindle, W6FB
> On Sep 20, 2016, at 8:47 AM, Jim Miller wrote:
>
> I have not installed any of the K3S lookalike modules but was up to date
> with all the mods until then. I remember seeing that I could not load some
> level u
KPA500 to change operating modes, or anything else
besides band. The opposite direction _is_ supported on a limited basis, which
is how band requests are sent to the K3 from the KPA.
- Jack Brindle, W6FB
>
> On Sep 25, 2016, at 6:21 AM, Bill wrote:
>
> I wish there was a macr
factory a call. They should be able to help you get it more quiet, although
they may
tell you the same things just did…
73,
Jack Brindle, W6FB
Elecraft Engineering
> On Sep 30, 2016, at 6:46 AM, Tom wrote:
>
> Just received a KPA 500 and KAT 500 yesterday. Using them with my Icom
> 7
cable
between the KPA500 and the K3/K3S, and in the KPA500 menu, the RADIO parameter
must be
set to K3.
Enjoy your KPA500!
Jack Brindle, W6FB
Elecraft Engineering
> On Apr 21, 2017, at 4:45 PM, Marvin Wheeler wrote:
>
>
>
> Somewhere reading the information about the new KPA1500
There is a big difference. They are not being charged while on the airplane.
Most of the Lion problems occur while charging.
- Jack, W6FB
> On May 17, 2017, at 4:27 PM, Chris Tate - N6WM wrote:
>
> That’s horrible William. So sorry for you loss.
>
> I am sure many in this great community wi
It would be pretty easy to modify the CP-1 to use SO239 connectors and mount it
in a box. I would do it while building the board - drill four holes in the
corners for mounting, mount the SO-239s on the box and wire them to the board.
But, I would also keep the BNC connectors for the test connect
The KPA500 is a full-break-in amplifier without doing anything to it. There is
no setup, you just use it.
There is no communications between the K3 and KPA500 as to the need for
break-in, just set the
K3 or K3S as desired (break-in or not) and the KPA500 will work just fine!
- Jack Brindle
Actually, thanks. I have been looking for something like this for a while, and
since they are available locally, it might be a good trip on my way to the FD
site.
Does anyone make a distribution / intercom box that allows the two ops to talk
between themselves without removing their headphones?
Steve;
It is 4:40 on a Friday. If you haven’t done so already, call Customer Support
NOW!
This is not good. My suspicion is circuitry on the PA sandwich, possibly the
input
network.
- Jack, W6FB
Elecraft Engineering
> On Jul 28, 2017, at 3:25 PM, Steve Lund wrote:
>
> It appears that my KP
How is the KPA connected? To what? What is the RADIO setting?
If you are using a K3 and have RADIO set to K3, then my guess is you have bad
connections in the AUXIO cable. In this mode the KPA. Asks the K3 to switch to
the band you request, then it waits for the radio to actually switch. It
wat
The KRC2 connects quite nicely to the K3’s AuxBus. In fact this is the
recommended method for using the KRC2 with the K3.
It will respond to the band change information the K3 sends on that medium.
The Auxbus is on the K3’s AUX IO connector. As I recall, it is on pin 2, with
ground on Pin 5. See
The three units are taking widely different measurements. The KPA500 measures
the signals it sees going into the KAT500,
while the KAT500 measures what it sees going into the choke. Finally, the
P3TXMON’s coupler measures what it
sees going into the coax going to the SG-235. It is quite probable
I can answer that one. It is in the equipment manuals. 15V max.
Some components are rated at that level.
You really don’t want to go too high or you lose a lot of power dissipated in
linear voltage regulators inside the equipment.
Of course too low and the transmitters can have issues. Things lik
gt; I hope you are saying that the derating for the components was based on a 15V
> max input.If there are 15V rated parts on the input rail, that's not good.
>
> 73 de AI6KG
>
>
>
>
> On Mon, Sep 4, 2017 at 4:49 PM, Jack Brindle <mailto:jackbrin...@me.
Or perhaps they were put to sleep by the X8.2 solar flare that pretty much
killed HF propagation a few hours ago.
Having spent too much of my life waiting out hurricanes in south Florida (some
of it involving emergency comm), I agree it is very much not a fun time.
Our family escaped the area th
Marvin;
Assuming that you have the AUX I/O cable connected from the KPA500 to the K3,
and you have RADIO set to K3 in the KPA500 menu, then I suspect you have dialed
the power down to 0 on the K3 when the KPA is enabled.
The KPA tells the K3 its state when it switches to STBY or OPER. The K3 us
I would ask this another way. What has changed recently. It certainly sounds
like the transmitter is at fault, but similar situations can arise in
conditions local to your station. Have you changed your antennas? Has something
changed in your antennas? Something in the feedline or antenna with d
Remember that the receiver is on all the time, as is the low-voltage supply
that is powering the receiver. All can cause problems in addition to the fan
PWM that the receiver is driving.
Good luck solving this one. There is not much room in the fan enclosure for
ferrites to help resolve the iss
thing to remember with the K2 is that
the
AUX I/O connector carries more than just RS-232 signals, and when connecting the
radio to the computer these non-RS-232 signals MUST NOT connect to the computer
DE-9 connector at all, or very bad things will happen.
Jack Brindle, W6FB
Elecraft Engineering
corrected a very rare issue with the amplifier changing bands
unexpectedly when operating in SSB mode. We want our products to be as good as
they can
possibly be, thus we addressed this issue.
V.154 is now being phased in as the production version for shipping KPA500s.
- Jack Brindle, W6FB
> On Dec
ssibly be, thus we addressed this issue.
>>
>> V.154 is now being phased in as the production version for shipping KPA500s.
>>
>> - Jack Brindle, W6FB
>>
>>> On Dec 23, 2017, at 7:54 PM, Michael Eberle wrote:
>>>
>>> What changes were made
Rick;
I am suspecting that the remote software isn’t checking for fan control
properly.
The ^FC; command can both set and read the fan setting; the remote software
should certainly be reading it. There is a command that has not yet been added
to the KPA500 Programmer’s document to report fan spe
You know, if it were me, I would closely follow my doctor’s advice. Being the
one-in-a-million case would not be very fun at all. Waiting a short while would
be much better than suffering any problems.
Besides, the time might be useful in learning some new technology, such as
receiving FT8, des
Ed;
It is easier than fabricating switch bodies. Mouser has several candidates -
look at their 502-ED903. It is a nice hand-held switch in a comfortable case,
costing about $12. Add wire and appropriate plug (mine has a phono plug for the
K3) and you can build a very nice PTT switch for less th
Did you win anything for finding the cache?
73,
Jack, W6FB
> On Jan 7, 2018, at 5:10 PM, Tom wrote:
>
> Mystery Solved
> Cops sent two cars, ...climbed the tree...
>
> https://va2fsq.com/geocache/
>
> Click on the pic...
>
> 73 Tom
>
> -Original Message- From: Charlie T
> Sent:
As Cliff notes, that is what the SERIAL setting is designed for. If you do
this, set RADIO to SERIAL, the RS232 X setting for the radio’s data rate, and
then set SER POLL to OFF. Setting SER POLL to ON will allow you to use the
radio and KPA without the computer.
Remember, the KPA is listenin
Hey Richard;
I’m glad you are enjoying our creation. The KPA500 is truly a fine piece of
hardware and firmware
that continues to evolve. The most recent firmware version is V1.54, releasing
in mid December.
Others have answered many of your questions, let me give my shot at a few. I
usually ru
John;
Where did you have the dummy load connected for the milliwatt calibration? As
shown on
page 52 of the K3S manual, it should be connected to the XVTR OUT jack, NOT the
main antenna jack.
Note that the milliwatt calibration is optional. If you aren’t planning on
using a transverter,
there
This is in the MAIN menu. Take a look at page 55 of the K3S manual. You will
find that the K3 and K3S commands and menu items are pretty much the same now.
For recent firmware, looking at the K3S menu will generally give you what you
are looking for.
73,
Jack, W6FB
> On Feb 1, 2018, at 8:36 P
Judging from the context, I would bet the question was asking about the _other_
USB - Universal Serial Bus,
which is present in the K3S.
No, I don’t know the answer…
- Jack, W6FB
> On Jan 31, 2018, at 10:56 PM, Michael Eberle wrote:
>
> MD2; will set the mode to USB
>
> From the Programmer'
Try 38400 instead of 4800.
Jack, W6FB
> On Feb 15, 2018, at 5:33 PM, Greg Best wrote:
>
> I am trying to get N1MM+ to talk to my K3 but will not do it.
>
> I am setup for 4800 B, Data 8 bits, Parity N, stop bits 1. DTR and DTS have
> been tried with both Always ON and Always OFF but neither
A little more info. The K3 and K3S default to 38400 bps on the serial port.
This can be changed in the configuration menu, and you should verify the
setting in the menu system.
If it is still set to the default, set your PC for 38400 bps (and the MicroHam
device as well, then give it a try. N1MM
Others have mentioned arcing as a possibility. We see more of than than we
would like. There are many poor UHF connectors and (especially) adapters
around. This is especially true with right angle connectors.
There is another possibility that could be happening. RF loves any wire it can
find fo
Interesting idea, but I would talk to N6TV before going too far down this path.
The reason is the introduction of +12V on the Band lines will cause issues in
the KPA500 and KAT500. There is a series-connected 220 ohm protection resistor
in the K3’s Band signals. When +12V is placed on the band l
There is a big problem with this, one that was unusual when Yaesu first created
this setup, but very common now. The issue is that of false powering of
receiving devices. In this day of low power micro controllers and other digital
devices, the device can actually be powered through the I/O port
> On Feb 28, 2018, at 7:23 PM, Joe Subich, W4TV wrote:
>
>
> On 2/28/2018 8:19 PM, Jack Brindle wrote:
>> It makes me wonder if perhaps the old Yaesu method should be retired
> > and no longer used.
>
> If you're willing to purchase/replace all the pre-199
It is in the latest KAT500 Serial Command Reference, and requires V1.42 or
later firmware in the KAT500.
Jack, W6FB
> On Mar 1, 2018, at 3:30 PM, Harlan Sherriff via Elecraft
> wrote:
>
> Thanks Dick, but I don’t see that command in either programmers reference
> manual.
>
> So Don, there
big switch to get the KPA500 running.
> Thanks so much for checking in!
>
> 73 de John, WK8A
>
> On Sat, Mar 10, 2018 at 9:06 PM, Jack Brindle <mailto:jackbrin...@me.com>> wrote:
> John;
>
> Did you get going? When I launch it on my MacBook Pro (macOS 10.13.3) I
Anyone contemplating getting one of these for use with an Elecraft radio should
contact N6TV. He has circuits that can make the Antenna Genius compatible with
the K3’s BCD antenna selection signals.
in its original form the two are not directly compatible.
- Jack, W6FB
> On Mar 28, 2018, at 3:
This is a remnant of days long gone when the PC - DOS and early Windows systems
used serial-port connected mice. It used the sequence to detect the presence of
a mouse. The Mac has never used asynchronous serial-port based mice, instead
using a special bus, followed by ADB in early Macs (startin
Andy;
You are using the KPA500 with a non-Elecraft radio. The Auxbus has no traffic -
it is _only_ used to communicate to the K3, and is only used when the K3 is set
in the KPA500 preferences.
I will communicate further with you shortly with more information to help clear
some of your misunder
Don is correct (as usual). The KPA will first see the band change, perform that
task, then try to amplify at the desired frequency. If it then sees a bad
reflected power level it will wait for the KAT to do something (which means
removing PTT, then performing its own correction, then re-enabling
Almost, but not quite. Assuming the amplifier is linear (as are the Elecraft
units), the amplifier will boost the signal by the multiplication factor of the
amp, up to a maximum value.
For example, the KPA500 has about 13db of gain, so the output will be 13db
above the input, up to about 700 wat
I’ve seen Bill’s setup. 50 watts with a decent gain antenna (i.e. beam) is
equivalent to 800 watts with Bill’s antenna and QTH. He really has done an
outstanding job with the resources he has to work with.
Also remember, we are talking about a 4 to 5 db difference in power here. And
when you hav
Let me correct myself before others do. Its a 12db difference. And I will rib
Bill about it. Still, to the west and north he has very high hills/mountains
that block the RF path. Makes me wonder if he was using reverse path for the
QSOs.
73,
Jack, W6FB
> On May 25, 2018, at 4:32 PM, J
Jeff;
Do I understand that for the first test you are driving the antenna through the
KPA500 and KAT500 (with KAT500 in bypass)? If so, it makes a lot of sense that
you will see different SWR. The KPA and KAT are providing a completely
different load for the K3. The better test is to feed the a
To the last question - Yes. The KAT500 and KPA500 do not communicate through
the AUX bus. Further, KAT500 is listen only, KPA500 is talk only, and KAT500
cannot listen to the KPA500 data.
Jack, W6FB
> On Jun 21, 2018, at 6:19 AM, ANDY DURBIN wrote:
>
> My KPA500 receives serial data (listen o
Also remember that each box you insert into the line will cause impedance bumps
and thus each will see slightly different loads. Thus the forward and reflected
power readings may not perfectly match. In some cases the variance (usually as
seen in SWR) can be striking.
Jack, W6FB
> On Jun 21,
Logitech keyboards work very well with the P3SVGA. The Logitech Unifying
receiver plugs into the P3SVGA’s USB port
and just work.
Recent keyboards such as the K380 give you additional features - you can also
use the keyboard with up to two additional devices.
This can be used to control both the
On Jun 25, 2018, at 8:12 AM, Jack Brindle wrote:
>
> Logitech keyboards work very well with the P3SVGA. The Logitech Unifying
> receiver plugs into the P3SVGA’s USB port
> and just work.
>
> Recent keyboards such as the K380 give you additional features - you can also
> use
PB CTRL should do what you want. See page 62 of the K3S manual.
Jack, W6FB
> On Jun 30, 2018, at 7:31 PM, Michael Gillen via Elecraft
> wrote:
>
> Good info on the filters I had never tried the LO/HI CUT and I like it. One
> question: On my K3S I cannot set the LO CUT to .35KHz it only steps
PM, Michael Gillen wrote:
>
> Hmmm when I try that I get Shif=.05 however and when I turn VFO-A it says N/A
> and it still moves in .10 increments?
>
>
>> On Jun 30, 2018, at 7:55 PM, Jack Brindle wrote:
>>
>> PB CTRL should do what you want. See page 62
arts!
Thanks & 73,
Dave AA3EE
no s/n yet!
- Jack Brindle, W6FB
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Not sure if anyone has seen this, but we have lost another good one.
The ARRL web site (www.arrl.org) carries an item this morning about
W8KRR, the father of the SB104 and other transceivers, and a
supporter of the K2 family, passing away.
We will miss him...
- Jack Brindle, W6FB
;><><><><><><><><><><><><><><><><><><><><>
<><>
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-Jack Brindle, W6FB
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My brain got got a little ahead of my fingers.
That should be _without_ extinguishing the diode...
Oops...
On May 22, 2006, at 6:47 PM, Jack Brindle wrote:
Interesting solution. Be aware that neon lamps fire at about 60-70
volts. At that voltage you have _definitely_ exceeded the PRV of a
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- Jack Brindle, W6FB
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-- Wilbur Wright, 1901
- Jack Brindle, W6FB
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helps!
On Jun 26, 2006, at 5:44 AM, Andrew Moore wrote:
I'm embarking on QRP projects and I'd like to find a (preferably
freebie)
spice-like circuit simulator to run on Mac OS X. Any suggestions?
There
seem to be quite a few variations out there.
- Jack Bri
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ng voltage
when keying CW via external keyer? Just curious, as
the WinKey Keyer (non-HV USB version) is only capable
of keying positive voltages up to 50VDC, and is not
compatible with XMTR's that use negative keying
voltages.
TIA
72 de N8PVZ
---bernie
-Jac
t/subscribers.htm
Elecraft web page: http://www.elecraft.com
-Jack Brindle, W6FB
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e of
reactance in the load, the math becomes non-trivial.
- Jack Brindle, W6FB
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-Jac
? Or put another way, are any of the
responses on the email Reflector, from Elecraft's
support technical staff?
- Jack Brindle, W6FB
-
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