Hi Dave,
Without a saved CONFIG file, I don't think there
is a way to retrieve the filter settings directly from
the K3. Have you tried examining the filter settings
for any information that is stored in a CONFIG file?
The K3 Utility permits viewing and editing stored
crystal filter settings.
Hi Randy,
If memory serves me correctly, others have reported
similar gremlins with seemingly random activation
of front panel controls that were not intended. The
remedy was (1) check whether your radio has the
gold pin connectors on the front panel-to-RF board
interface, and (2) carefully
Hi Gary,
I bet you've never used that retort before now.
I don't need any servants, but I could use a
'memory' (not Memory) with same day service.
73,
Mike
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Hi Mike,
You mentioned that you jumped through
all the menu hoops to no avail. Do you
know which version of firmware 2.04 you
have installed? (there will be a letter after
the 2.04, e.g. 2.04P or 2.04R).
If you have set the sidetone level to, say,
060 and the sidetone pitch to a value
between
Hi Dave,
I can't speak to the module you ordered, but I
received on 28 October the KPA3A 100 watt upgrade I had
ordered back in spring 2021. The effort to ship upgrades
is definitely a 'live effort,' and the Shipping Status updates
on the Elecraft web page accurately reflected the
status of the
Hi Pete,
I had a similar set of symptoms with my K3
several years back. Turns out it was not the
K3 at all, but a failing filter capacitor in
my linear regulated power supply. I
had sporadic audio dropouts after transmitting
in much the same way as you described,
always at QRP TX levels.
Try a
Thanks to Don, W3FPR for the reminder on how
to check the firmware version.
To Mike, WA5POK: as point of reference, I
checked my K2 STL setting and it's quite
loud at 002 using headphones. I recommend
trying a lower STL level setting than the 060
I originally suggested. I only use headphones
Last weekend I installed the 100 watt PA module (KPA3A)
in my K3/10 (S/N 67xx). I used the K3 Utility to perform the TX Gain
Calibration at the 5 watt, 50 watt, and 1 mW levels - all
completed successfully. However, when I read the
firmware update page I found that one should perform
the 6 meter
of the University System. Do not
click links or open attachments unless you recognize the sender and know the
content is safe.
2. The K3Utility displays the results of the most recent calibration it
performed.
73 de Dick, K6KR
> On Nov 9, 2023, at 18:13, Michael Carter via Elecr
Hi Pete,
I originally posted my observations to both
the official Elecraft reflector and the elecraft...@groups.io
forum. Until your response on the official reflector
there had been only two responses on the other forum.
I posted additional observations this morning on the
groups.io forum - if
Hi Dick,
Does your K3S receive OK if the TX Power control
is set to less than 12 watts?
Do you have transmitter output if the TX Power
control is set to less than 12 watts?
If the answer to both of those questions is 'Yes,'
then you're looking at one or more of the following
issues in the KPA3A
And one more thought, with thanks to Bill, K9HZ who
reminded me that relay K1 on the KPAIO3A riser board
can produce the same symptoms if it fails to engage
the 100 watt PA module when the Transmit Power control
is set above 12 watts.
73,
Mike, K8CN
Hi Jim,
I don't have an answer to your question, but
will note that you are the 2nd person in the last
month to report this issue. Thomas, WA8UNS
also experienced repeated random resettings
of the CAL TPA parameter to large values, often
in excess of 200. He reset the parameter to
the actual
Hi Mark,
The high current condition on the KPA3 (or KPA3A, if newer K3) PA module may
arise from a problem in one of the lowpass filter sections if it's not purely
an external fault condition.
If you have the internal KAT3 ATU, you could try putting a dummy load on the
2nd antenna port and
Hi Ron,
Did you use the K3 Utility to run the TX Gain Cal
automatically or did you perform the calibration
manually?
If you used the K3 Utility, it should display
the status of the TX Gain on each band
and at each of the 3 power levels. Does
the TX Gain Cal report indicate that the
transverter
Hi Dave,
By 'full output' do you mean on transmit or receive or both?
The SSB filters are physically the same for USB or LSB on
a given filter slot.What differs is the frequency offset
programmed into the TX DSP.
Check the procedure on p. 49 of the K3S Owner's Manual
to see what you have
Hi Steve,
There is no documented method to set a lower
TUNE power when a non-Elecraft external ATU
is used or when no external matching unit is
present. The TUNE button on the K2 keys
the transmitter at the requested TX power
set by the POWER control, e.g. 100 watts,
in the absence of a
My apologies to Steve and Dave W8FGU!
I re-read the KPA100 manual and learned
that the K2/100 DOES reduce TX power
to 20 watts when the TUNE button is pressed
and the POWER control setting is above
that level.
I have my KPA100 integrated with a KAT100
in an outboard case rather than being
Hi Karin,
You've resurrected a topic that was once very
active on this same Elecraft reflector:
https://www.mail-archive.com/elecraft@mailman.qth.net/msg27397.html
It's a long thread. I recommend skipping down if you're
in a hurry to read the post by David, M0DHO:
+1 for what Brian, K0DTJ suggested!
The front panel buttons use a similar
voltage divider with a multiplexed
A/D converter to determine which button
has been depressed.
73,
Mike, K8CN
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Hi Paul,
Glad the TX Gain calibration fixed the ATU issue.
Always thankful for the 'no soldering/de-soldering
fixes required!'
73,
Mike, K8CN
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Help:
Hi Paul,
I would first check that the KAT3 is still enabled.
Use the CONFIG menu to scroll through until
you see the KAT3 status.
I find sometimes that if my finger lingers too
long on the ATU TUNE button, it causes the
ATU to go into BYPASS mode, i.e. the ATU is
not inline. It should show
One more thing to check, Eugene:
Are the other two antenna ports
on the KAT500 connected to
anything? If so, disconnect
those ports other than the one
you used in your video demonstration.
73,
Mike,
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Hi Eugene,
Are you using a switch-mode power supply
to feed the KAT500? If so, try a linear regulator
supply or a battery instead.
Is your KAT500 bonded to your other station
equipment and AC ground with a short, wide
conductor? (not just the coax shields)
Since you're not the original
Hi Gary,
The K3 computes forward and reflected power
from samples taken in the SWR bridge circuit.
A Tif X Gain calibration could fail because the
forward power reading is incorrect due to
a failure in that portion of the SWR bridge
circuit.
Do you have the KAT3 ATU in your K3?
If so, be sure
Hi Jerry,
When I'm searching for pricing information
on used ham gear, I search three sites
https://www.eham.net/classifieds
https://forums.qrz.com/index.php?forums/ham-radio-gear-for-sale.7/
https://swap.qth.com/index.php
Each of these sites enables search for specific keywords.
It may take
I'm glad that one was relatively easy to resolve, Pete.
No hardware intervention required - sigh of relief.
Joe is a wealth of knowledge!
73,
Mike, K8CN
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Hi Pete,
If you've confirmed that the RX ANT is NOT selected
on the 80 meter band for the sub-RX, I would
check the CONFIG entry for the KRX3 to be sure
that it's not selecting the AUX RF input. It might
have been selected inadvertently if you used
BSET to change the sub-RX settings.
73,
Mike,
I've been getting reacquainted with my K3 (S/N 67XX)
since adding the 100 watt PA module (KPA3A) last
weekend. I also updated the firmware to the latest
versions and ran the TX Gain Calibration successfully
at all three power levels. The K3/10 had been sitting
disconnected from everything since
Email copied below is from a post I made
in response to Jim, K9YC on the elecraft...@groups.io
forum. This email has some additional observations
made early this morning. The shack temperature
was a New Hampshire-balmy 54F/12C.
73,
Mike, K8CN
-- begin copied email
Hi Iran,
I changed the subject line to reflect that this
thread is continuing as a general troubleshooting
exercise with your K2.
The NE602 product detector has a balanced
output circuit and unless you use a differential
scope probe (or do the CH1 - CH2 trick with
your single-ended probes) you
Hi Paul,
Could you please post the TX gain parameters
recorded by the K3 Utility at the 50 watt level
for all bands?
If there is a significant difference in those gain
parameter values between adjacent bands (say
30 and 17 meters) and the value on the 20
meter band, that may be an additional
of the filters (either BPF or LPF) and
the associated relays that select the filters.
73,
Mike, K8CN
From: dyno lab
Sent: Tuesday, March 5, 2024 11:19 AM
To: Michael Carter ; Michael Carter via Elecraft
Subject: Re: [Elecraft] K3/100 TX problem on 20m
[You don't often
Hi Harold,
It's certainly true that cold solder joints
can arise from dirty/corroded PCB solder
lands. The Elecraft boards in my K2/10 (now
17 years old, built by me) are very good
quality with plated-through holes and
durable solder mask. I had occasion
to open my K2 to install the SSB and
Hi Paul,
For comparison, here are the 50 watt TX gain values from the
calibration I did last November when I installed
the KPA3A 100 watt PA in my K3 (s/n 67xx):
1900 kHz TXGain HP 10
3750 kHz TXGain HP 06
5336 kHz TXGain HP 08
7150 kHz TXGain HP 08
10125 kHz TXGain HP 08
14200 kHz TXGain
Hi Harold,
The K2 serial number is on an adhesive tag to
be placed on the lower rear panel of the radio.
It was in a very small manila envelope in
my K2 kit. I don't believe there is any internal
coding of the MCU that contains the rig's
serial number as there is in the K3.
73,
Mike, K8CN
Hi Jerry,
I agree that the relatively low TX power output on 20M
originates in the KPA100 module. Did you build that
module and install it yourself? The LPA circuit in the
base K2 seems to operating normally, and your
peaking of the BPF confirms that.
If you have capability to sweep the
Hi Steve,
No answer for your question #2 - Elecraft sells
packs of 25 screws for modest price, but shipping
to U.K. and VAT (if applicable) may dictate
otherwise. Maybe pose that question to John,
G3PQA - he's done a lot of work on Elecraft
radios for fellow hams in the U.K.
Before doing any
Hi Paul,
I'd say that our respective KPA3A TX Gain calibration
values are similar enough. Having not had the
bipolar PA model KPA3, I don't have a point of
reference for whether your TX gain parameter
values are reasonable or not.
I would contact Elecraft Support and copy
Keith, WE6R with
a
Hi Mike,
>From K3 Owner's Manual in the section describing
menu entries, p.55:
CW WGHT 1.15 Adjusts element/space timing ratio (weight) for the internal keyer.
Additional functions of this menu entry, via numeric keypad (Advanced):
Tap 1 to select SSB -CW (default) or SSB +CW (allows CW in SSB
Hi Allen,
If you're not already aware of it, there is a dedicated K4
forum on groups.io that is likely a richer source of
answers to your question. The posts here regarding the
K4 are infrequent. Be prepared for a fire hose of response
when you pose your questions over there -
Hi Robert,
You've used the term 'receiver noise', but specifically
mentioned heterodynes and harmonics as being of
concern. All receivers, Elecraft not excluded, have
internal spurious signals generated in the VFO and
BFO circuits as well as clocks for digital circuits in the
radio. The best
Hi Carlos,
When you say 'no voltage' measured
on Q6, can you be more precise?
The collector of Q6 should measure
about 12 V DC whether in TX or RX.
The base and emitter voltages will
be zero until the transmitter is
keyed on. The base voltage depends
on the selected mode (CW or SSB),
and I
Hi Roger,
The fact that the low output corrected itself
after a band change suggests a relay problem
in either the lowpass or bandpass filter
sections.
Have you tried to run a TX Gain Cal routine
lately? If not, that would be a worthwhile
first step before opening the case and
poking at relays.
Hi Carlos,
Since there is zero voltage measured
on either terminal 1 or 2 of transformer
T2, I would look at RFC4 and test continuity
there. It could be that RFC4 is now open.
Keep tracing the voltage along that +12V
rail back to the point where it supplies
the Q7 and Q8 collectors via the
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