Could a rectifier diode have gone open (as in it's now a half-wave circuit)?
If so the filter caps are at 60 Hz. Just a thought...
RoyK6XK
I have a KPA500 with a low HV reading. It is on the center tap and AC
voltage is 115v No load and 110v full load. The HV goes from 77v NL to 56v
FL
John, I think you may have won the Unique Problem Award with that one. Good
luck (sorry).
Roy K6XK
I am trying to run down a CW transmit problem on my K3s. Anytime I change
the mode from LSB or USB on any band to CW it starts to send a “dit” without
stopping and I have to halt it by
No, fuses have voltage drop both in their elements and contacts. Just what
you're trying to defeat and avoid.
73, RoyK6XK
I recently purchased a used K3 and am building a short power cord (after the
discussion of voltage drop from longer cables). I noticed that the power
cable that
Ken,
I don't own a KX2, but perhaps tiny applications of one of the various
'threadlockers' on the market would be perfect. The thread lock comes in
small tubes and is available in several "strengths." Use only the lowest
strength -- the high strength can be virtually permanent!
73, Roy
Eric -- this is not at all normal! My PSU is quiet...hardly hear it from
under the table. I understand Elecraft changed to much quieter fans maybe
two years ago. But even so, perhaps the voltage to your fans has soared way
to high? I haven't looked at the circuit driving them. Maybe lost
Pete...odd is right. Does it happen when using built-in keyer?
73, Roy K6XK
-Running into what I'm sure is a simple matter of menu settings, but...
My K3 is set for PTT with a "normal" TX delay of 008 (I presume 8 ms.),
driving a KPA-1500. I am getting persistent reports of clipping
K4WJ alerted me that you can access ver 2.17 on your Utility. Went right in!
73, Roy K6XK
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Post:
"...Let's allow the reflected power to increase all the way to 10
watts! At that point, your SWR would be about 2 to 1. Sounds pretty bad, but
surely if you were stranded in the desert and had to use your KX3 and a wire
to get help, you'd be happy to have a match this good...(etc.)"
From
Ditto, Ron!
73, RoyK6XK
Thanks, Ron!
73 de Dick, K6KR
Just installed new Firm-Ware Version 2.17.
It has solved all the digital wattmeter anomalies and is working perfectly
here.
I recommend this version for next standard Firm-Ware update.
Thank you. 73's
Ron Durie
WB4OOA
Seems that the ammeter current is also much more erratic reading now while
sending CW.
Roy
-Original Message-
From: Roy Koeppe
Sent: Sunday, March 31, 2019 5:44 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] KPA1500 v. 2.10 addendom
Discovered another anomaly...the digital SWR
-Original Message-
From: Roy Koeppe
Sent: Sunday, March 31, 2019 5:15 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] KPA1500 v. 2.10
Thanks for that report Roy. Notice the same defect here in the digital
display. I have only worked CW mode so far, and the power reading is erratic
and varies
a
correction is provided for us soon.
73, Roy Koeppe K6XK
-Original Message-
From: Roy Morris, Jr. via Elecraft
Sent: Saturday, March 30, 2019 10:57 PM
To: Elecraft Reflector
Subject: [Elecraft] KPA1500 v. 2.10
After loading v.2.10 the LEDs seem to show the correct power level
"The more parts you pile into the rocket, the more likely it will end up
pointy end down somewhere in the western desert."
--NASA proverb from Apollo
Or, "Simplicity is Ingenuity"
Roy K6XK
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About:
"Has anyone had experience with both the KPA1500 and any of the current
(1.3K, 1.5K or 2K) Expert Linears from SPE?"
If you cherish silent, perfect CW QSK, then you need the KPA1500. SPE uses
clacking relays.
73, RoyK6XK
About:
"Just got my KPA-1500, and it seems to work great except that the ATU BYP
light is always illuminated. The ATU operates normally when I light the
IN light with the ATU Mode switch and apply drive. I can't find
anything in the manual about this."
Can anyone clarify?
73, Pete N4ZR
" My KPA1500 (s/n 121) has developed a problem:
When applying power (15-20W) from the K3 to the amp, it immediately faults
to:low gain fault ratio 3 (sometimes ratio 2 to ratio 6). The SWR indicator
shows high SWR as the amp faults. 100w only from exciter will cause ATU to
tune to 1:1 but
Hi Doug,
Yes I was from 1958 through 1962. How do I access the Questionnaire?
Roy, K6XK
-Original Message-
From: Doug Hensley
Sent: Sunday, December 16, 2018 12:14 PM
To: Elecraft List
Subject: [Elecraft] OT: Were you involved with Military Communications
during the 1950's - early
" Upon further testing, I have found that the efficiency of the KPA-1500 is
varies greatly with driving power."
That's the reason SPE amps have a power range selection choice setting. (Me
thinks)
73, RoyK6XK
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Ken,
In my K3s it appears to be a 20A Breaker, with a push-button reset. Seems
ignored in the manual!
73, RoyK6XK
"How does one open the fuse holder. I am afraid of breaking it."
Ken K5WK
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Scott, again if you have missed it, Elecraft has an 'ATU update Kit' for
this purpose. Mine is to be shipped "soon." It is a PC filter board to be
installed.
73,Roy K6XK
SN 0178: With FW 1.64, the flashing SWR LED problem seems to be gone.
On 10 meters, the display no longer goes
left half of the display
instantly blanks out and remains that way till you reboot the amp power
switch. Has been reported by several with early serial numbers like my #160.
Roy K6XK
-
Could you describe this problem. I have not seen it.
- Paul KW7Y
At 05:27 AM 7/20/2018, Roy Koeppe wrote:
Now
Baldock
Sent: Friday, July 20, 2018 9:36 AM
To: Roy Koeppe ; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 latest firmware
Could you describe this problem. I have not seen it.
- Paul KW7Y
At 05:27 AM 7/20/2018, Roy Koeppe wrote:
Now am waiting for the promised ATU upgrade kit to fix
Yesterday I updated KPA1500 Utility version and then firmware. That
corrected the occasional random flashing of the SWR LED bar display curse on
my s/n 160. Glad! Now am waiting for the promised ATU upgrade kit to fix the
main display cut out problem which occurs on 10 and 6 meters.
73,
Hi Don,
I hear nothing at all from my supply there or anywhere else so far. My power
supply is under the table on a low stand, so is less than 3 feet from the
K3s. Just FYI, but it seems I would hear something.
73,Roy K6XK Iowa
I just received my new KPA1500 last
One reason 'all fuses' aren't just rated at 250v to be done with it is that
a shorter element section in a lower voltage fuse can have a lower
resistance, due to the shorter arc gap allowed. Thus lower voltage drop for
a low voltage circuit, etc.
73, RoyK6XK
"Many vanity calls are chosen because they are easier to copy, especially in
the case of CW. My call is NOT an example of an "easy to copy on CW" call,
having too many dahs and strings of dits causing the little short "e" to be
missed. It is also NOT a vanity call."
Right, some cw ops
TAX
On 7/9/2018 11:43 AM, Roy Koeppe wrote:
Yes, that is what I am using.
73, Roy K6XK
I probably missed this but my google searches aren't working either.
Will 2x 20A breakers (220v) be sufficient for the KPA1500?
_
Yes, that is what I am using.
73, Roy K6XK
I probably missed this but my google searches aren't working either.
Will 2x 20A breakers (220v) be sufficient for the KPA1500?
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Right now in Iowa, S9 CW signals, mostly from W4-land (2 pm Central)...
73, RoyK6XK
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About-
"Take care in the application of added cooling efforts"
Yes, but the proof is in the pudding; watching LEDs display the amp's temp,
the readings are always cooler with the aux fans running. One reason is that
between transmissions they continue running and reset the temp back to near
Hi Mack,
To my ears, very loud when speed gets up to #4 during a very long CW
transmission.
Roy K6XK
-Original Message-
From: Mack McCormick
Sent: Tuesday, May 22, 2018 5:18 AM
To: Elecraft Reflector
Subject: [Elecraft] Will the KPA 1500 operate RTTY in "run mode" for
"The benefit to putting fans in back blowing through the stock
screen/fans is that you get the slight added benefit of over-pressuring
the chassis which tends to keep the chassis interior cleaner. Assuming
adequate rear spacing, you can hide the fans a bit more"
Yes. and the ultimate is
"Do the KPA1500 fans push air into the box? If so, why doesn't the KPA500
fan do that. If the KPA1500 fans pull out of the box why would it be
appropriate to use an additional fan that opposes this airflow?"
Yes, they do...which is also opposite of airflow in K3s. The idea of the
additional
move any air across the heat sink or solid state devices that
need the air. The air that comes out of those vents starts at the fans in
the rear."
BillK3WJV
On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe <k...@ncn.net>
wrote:
All,
My solution is two 4.5-inch, 48-volt dc muf
All,
My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans
"...did notice an occasional flashing of yellow and red in the SWR led
string. I watched my inline meter and it showed nothing during those
bursts so something is going on there. (etc.)"
This is common with the new amp. Elecraft is working on a firmware update
to correct it -- hopefully.
acceptable number. I agree.
If you crank it up to max (5) you might scare the dog, be careful, hi.
BillK3WJV
On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe <k...@ncn.net>
wrote:
Works perfectly so far. The fans have never come on during my testing
periods, including at full power. P
Works perfectly so far. The fans have never come on during my testing
periods, including at full power. Power supply fans under the table are
quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA time.
73, Roy K6XK
Les,
Possibly "power drift" in your antenna? Sometimes trap antennas have ceramic
capacitors which drift under high power. Try a dummy load, etc. I think the
SWR threshold point at which the auto tuner makes correction is adjustable
in the amp. Try setting it up a little higher? Please let
Picky, picky,
Old slide rule with wide calibration marks -- good enuff for government use.
73, RoyK6XK
-Original Message-
From: ANDY DURBIN
Sent: Tuesday, May 08, 2018 1:26 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 - PA- Temp
"46C = 118F"
46 deg C = 114.8 deg
You're kidding of course -- 46C = 118F, which is a typical summer's day in
the central valley in Calif. So sitting at a picnic table in the shade of a
tree, with the K3 turned OFF is what the PA temp would be! That's super
cool!
73, RoyK6XKIowa
-Original Message-
Hi,
My order online invoice for KPA1500 states shipping method: UPS.
73, RoyK6XK
-Original Message-
From: alapa...@w2cs.net
Sent: Wednesday, April 18, 2018 5:17 PM
To: elecraft
Subject: [Elecraft] KPA1500 Caution
I’m a day-2 KPA1500 patient waiter. I got the email 2 days ago
VOX needs be ‘ON.’
Roy K6XK
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Please
Carl,
I haven't seen any responses to your question -- have you determined
anything further by now? Assume you're not using ALC hook up?
73,RoyK6XK
"When running the KPA1500 at full power, sometimes the power will fluctuate.
EXAMPLE: I was checking in to the Elecraft SSB net a
Rule #1: alus look for simple things foist
Roy K6XK
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It is the "custom" for CW mode to use LSB on the bands below 20 meters and
CW USB on 20 meters and the bands above it.
Hiram Percey decided that long ago.
73, Roy K6XK
I for one like the tuning direction of the Elecraft rigs in CW (LSB).
When I began ham radio using much older
Just my idea maybe...if you do not plan to squeeze key, then I think a
single-lever version is superior. In simple terms, 'the finger piece can
only be in one place at a time.'
73, Roy K6XK
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"How I can set the scan delay when a signal is found?...(etc.)"
Dang it, I thought I saw that once in Fred's book or the manual -- now
cain't find it either. Will try again...
73, Roy K6XK
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"received today a message, supposedly from the list mom, saying that I had
"too many bounced emails" and that my membership in the list was being
suspended."
Try plain text and make sure if your pc has more than one email address,
that it is set for the subscription address.
73, Roy
'twas said,
"...And thanks to the latest changes, hunt-and-pounce ops, like me, will
almost never hear a fan come on." (etc.)
GREAT
73, Roy K6XK
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Here's what Pete originally stated:
"...the jack appears to be shorted all the time...(etc.)"
Think he has it right, but he's using a digital meter -- tricky.
73, Roy K6XK
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Rumor had it in the AF that Navy radio ops used ladies' falsies glued to
their cans for nice soft cushions.
73, RoyK6XK
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Two BLF188
73,RoyK6XK
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Please
Re all the fans postings, it appears my K3s uses convection cooling during
light usage periods, drawing air in at the rear, backwards thru the idle
fans, and out the top. When fans engage, air flow is reversed...drawn in
thru the top and out the back. "Simplicity is ingenuity."
73, Roy
About,
"...Also, what type of connection is
used for grounding?..."
Looks like a full-sized banana plug jack?
73, Roy K6XK
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Help:
Re:
Question:
"Can the internal tuner be completely bypassed like the K3S can do with
its tuner?"
I see a bypass button on front panel.
73, Roy K6XK
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Was asked,
" Do other amps make any concessions for 30 m? "
Si, Si ... ALS-1300 has 30 m on its band switch.
73, Roy K6XK
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"I note there are feet on the side which implies handles. This I haven't
seen mentioned." (etc.)
Even a BC-610 had handles!
73. RoyK6XK
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Aboot:
"And the reason you "need" the extra 1000 W is that the others in the
pileup are all running max power. A typical arms race, with tempers to
match."
Apparently none of you here ragchews on 80M CW roundtables at sunrise times
during spring/summer thunderstorms seasons across the
About:
”...With two KPA500's one would have two radios with 500 W each, and when
that little extra is needed, one could run both amp's in parallel from a
single radio. Liftability would be very good! I know that is not a new idea,
but implementing it seems a little messy. Might Elecraft consider
Al,
When transmitting, the current node does the 'work,' so I'd say it also does
the main receiving job. But the difference in your situation might be small.
Good luck & 73,
RoyK6XK
-Original Message-
From: Al Lorona
Sent: Friday, March 10, 2017 3:38 PM
To: Elecraft Reflector
-Original Message-
From: Wes Stewart
Sent: Wednesday, March 01, 2017 8:27 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals
No truth at all.
Correct -- radiation resistance remains the same or even slightly lower --
lower Q.
73, RoyK6XK
Trouble 'came clear' on its own! Is reliable. Thanks for helpful thoughts
from y'all...perhaps was a small EMP.
73, Roy K6XK
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Help:
Power will not turn on! Nothing. Measured correct voltage at end of power
cable. Switched to a different power supply -- same. Manual mentions very
little about this? The circuit breaker under antenna 3, marked '20' on back
of rig is not in popped-out condition. Rig is under warranty, so I
Yas,
Down here too.
73, Roy K6XK
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Re:
" QRN, not QRM
I thought QRN was exclusively atmospheric noise. Perhaps we need a new
Q code for man-made garbage."
We do have one...in the 'old abbreviations books' -- it's QRNN. (Young
whipper snappers, anyway).
73, RoyK6XK
" looking for input on how well the K3 will integrate with the SPE expert
2K-FA? (etc.)"
If you operate CW QSK, be aware the SPE uses relays which clack quite
loudly.
73, RoyK6XK
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“Kpa500 on 60 is illegal unless you have a *measured and
documented* VERY lossy antenna that would reduce the effective radiated
power to the same as 100 watts on a dipole. The simple 99 percent answer is
that on 60m SHUT OFF the Kpa500 and run 100 watts barefoot.”
Let’s see,
“antenna tuner”
I suggest adding a second resistor, across the headphones' cord, forming a
pad instead of just a series resistor. Approximately 50 ohms shunt will
restore damping effect to the headphones' response. This is good practice.
73,Roy K6XKIowa
The proper name for the power switch type used in gear such as the SB-200 is
Rocker Switch. There, that's off my chest.
73, RoyK6XK
---
This email is free from viruses and malware because avast! Antivirus protection
is active.
http://www.avast.com
Surely the K3 has a CW Weight Control Setting Adjustment feature for using
paddles and so does an external keyer or board!?
73, Roy K6XK
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Help:
About,
... It is /hard/ to work DX with 5 watts and a low dipole (or worse, a
Buddipole or similar antenna). This can be very frustrating to new hams
who have yet to develop the operating skills that make this possible
...etc.
And don't buy your child a cheap microscope; it could forever
...I ask the same question: Has anyone found a source for Yamaha CM500
replacement pads?...
Try headphones.com
Roy K6XK
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Tryheadphones.com
73, RoyK6XK
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I was sorry to see the discussion about ERP calculations end...using the
formulas presented on here, I was preparing to run at least 1-KW into my
antenna in order to achieve the 100-watt ERP 60-meter power limit.
73, Roy K6XK
Home Depot carries a wide assortment of felt circles for use under table
legs or as bumpers for cabinet doors, etc. They have adhesive on one
side (which could face the knob), but if you don't like that the felt is
thick enough that you can actually shave off the adhesive with a sharp
razor.
All,
This one uses the ExpressCard slot and is supposed to work flawlessly:
(I have not tried it myself)
http://www.newegg.com/Product/Product.aspx?Item=N82E16839158019
73,Roy K6XK Iowa
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