Hi Mike,
Can you verify if the correct coils were installed
on the filter board in the Band 1 and Band 2 positions?
Same question for the two crystals used in the PreMix
oscillator?
73,
Mike, K8CN
__
Elecraft mailing list
Home: http://ma
Hi Curt,
Do you have the internal ATU in your K3s?
If so, disable it by putting it in Bypass mode
and repeat your experiment.
Does the Forward power meter show any
output power, and can you confirm the
actual output power with an external power
meter?
If you still have a very high SWR into a du
Hi Ron,
I've not seen any 'dimensioned PCB' layouts for the K2
RF board or Control board. The manuals over the years
have included the skeleton drawings of parts placement,
but no scale is included.
I suppose if someone had a K2 RF board which is bare
and could take a photograph of it, one could
Hi Holger,
Measure the voltage at the output terminal
of U3, the +5V regulator that supplies U1's
V_DD voltage. If that is also 4.833 V DC,
then all is OK.
Due to component variations, one can expect
to measure DC voltages within 10% of the
nominal table values. Your reading, depending
on which
Hi Tom,
Do you have either or both of the SVGA or TXMON
boards installed in your P3?
How is the Power jumper block configured (e.g.
P3 powers up automatically whenever +12V is
present at the rear jack, or only with the front
panel power switch activation)?
The very low 3.3V bus voltage suggests
Hi Corky,
There is an internal 1 A fuse on the rear panel I/O board.
If the fuse is intact, more diagnostics are required.
73,
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailma
Hi Cory,
I opened my P3 this morning to look at the
rear panel I/O board. The fuse I mentioned
is an SMD flat pack, so likely a resettable
poly fuse rather than a conventional wire
fuse. Not designed for quick replacement
by the operator.
If you hold the front panel POWER switch,
do you see any
Hi Bill,
I think you've got a genuine hardware problem
rather than being transported into an unknown
menu setting. Does the MENU button work
at all?
Can you change the frequency display by
rotating the main tuning knob?
The K2 uses a parallel switch status polling
process to determine the switc
Hi again, Bill,
I re-read your post and realized that
it's only the buttons to the right side
of the LCD display that fail to function
(with the exception of the MODE button).
Is that correct?
If so, I will retract my statement about
the parallel load shift register not working
properly. If it w
Hi Jim,
Is the low TX power present on all bands?
Even though it may be fruitless, try the
TX Gain calibration routine using the
K3 Utility and a good dummy load. If
you're doing the TX Gain cal manually,
be sure to set the internal ATU (KAT3/3A)
in 'BYPASS' before doing the calibration.
The pr
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.
Yo
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 clean
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
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/ele
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 50
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
an
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
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 m
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
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 m
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 y
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 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 BYPAS
Hi Paul,
Glad the TX Gain calibration fixed the ATU issue.
Always thankful for the 'no soldering/de-soldering
fixes required!'
73,
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://ma
+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
__
Elecraft mailing list
Home: http://mailman.qth.net
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 construc
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,
__
Elecraft mailing list
Home: http:/
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 tha
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 a
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 occ
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:
https://www.mail-archive.com/
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 o
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 stor
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 connected
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 install
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'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
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
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 room
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 wi
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 nois
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 clue
one 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 d
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 HP
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 req
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 mo
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 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 tes
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 - elecraft...@groups
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 20M/30M
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 way
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 reco
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 transf
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 Mike (K4PI),
I recall a bracket like the one you described
from my recent addition of the KPA3A 100
watt PA module to my much older K3/10.
I don't find mention of it in the KPA3A manual,
but my recollection is that it was installed
on the rear panel of the K3 to stabilize/hold
down the KPA3A mo
I checked the interior of my K3 with the
new KPA3A 100 watt PA module installed.
There is an L-shaped hold-down bracket on the rear
edge of the KPA3A board, which is secured
to the rear fan panel with a single screw
(not visible from the top opening of the case).
It matches the dimensions of the br
Hi Ray,
I don't have a copy of Lyle's original document.
One alternative description of the integration
of the KPA100 with the KAT100 in an EC2
enclosure is here:
https://ke4rg.blogspot.com/2015/03/assembling-and-using-kpa100kat100-ec2.html
I did this integration in 2018 with a KPA100
I built an
I don't have a K4 nor am I likely to afford one any time soon. I am curious to
learn more of its internal hardware architecture, which I can infer from
professional experience, but the many discussions on the K4 groups.io forum
have made clear that the 'secret sauce' is largely in the software/
I've been using the SS-25 as the supply for my K3 or K2/100 for several years.
I've been curious about how much voltage drop I see in the stock DC power cable
that came with the K3 as a function of supply current. No DC power
distribution blocks here - just straight cable from K3 PowerPoles to
Hi Lenny,
Have you operated SSB recently or only FT8?
I would remove the RigBlaster interface to the K2 (audio, PTT and RS-232) and
try a known good microphone directly to the front panel connector on the K2.
If you can activate PTT from the microphone pushbutton and see (or hear on a
separat
Hi Chris,
Jim, K9YC advised that the MONitor settings may differ between your two radios
even though both are set for the same perceived loudness in the same
speaker/headphones. That triggered a thought - I would check that the encoder
on the CMP/POWER control, which adjusts the MONitor volume
Hi Tony,
Keep an eye out not only on this 'official' Elecraft reflector for K2 radios
advertised for sale, but also on some of the broad spectrum ham swap sites. I
check eham.net, qrz.com, and swap.qth.net classified listings several times
each week. I saw that Guy, N1GMM offered one of his K
Hi Tony,
Somehow my response to your query about finding a K2 generated several emails
to me offering K2/100 radios plus various optional modules. I forwarded those
emails to your QRZ.com email address.
73,
Mike, K8CN
__
Elecraft mai
Hi Mike, K6STR,
There has been a lot of discussion of the front panel button degradation on
this forum as well as the newer groups.io forum. Here is a link to one such
thread:
https://groups.io/g/Elecraft-K3/topic/k3_buttons_erratic_behaviour/79941806
I've also watched a YouTube video of the pr
Hi Mike,
No experience here with aircraft instruments, but you could contact
Dave, KM3T and Kriss, KA1GJU for advice. Dave is an instrument-rated
private pilot. Kriss is both commercial and experimental aircraft pilot.
Both have many decades of experience.
Dave is k...@km3t.org
Kriss is klie..
Hi Evert,
Can you say a bit more about the symptoms of your receiver that lead you to
think it's a front-end problem, i.e. a problem occurring before the 1st mixer?
If you were to inject a 20 mVp-p signal into the 1st mixer RF port, that would
present a 1 uW power (if the mixer showed a 50 ohm
Hi Pat,
Thanks very much for taking the time to carefully document and report your fix
of the intermittent RF signal path in your KPA3A. While I have a much newer
KPA3A in my old K3 (non-S) radio, it's good to know what you've learned by
diagnostic effort and successful repair.
73,
Mike, K8CN
Hi Steve,
The absence of the high voltage reverse bias supply on the cathodes of D12 and
D14 when in TX key-down state suggests two possibilities
1.
1.
Q6 has failed with a permanent drain-to-source short. That would provide a path
for current through D14 as well as through D13 when in tr
Hi Mike,
Thanks for reporting the resistance measurements. I will think about your
results from both the DMM diode test and the resistance measurements. It may
not be necessary to lift one leg of D5, so I'm glad that step is postponed for
a few days anyway.
Cheers,
Mike, K8CN
__
G'day, Mike,
You mention checking diodes D7 and D10. On the KPA3A module, the relevant
diodes in the T/R switch are D2 and D3 in the receive path, D5 and D6 in the
transmit path.
The loss of receiver sensitivity when the POWER control is advanced above 12 W
indicates that D2 or D3, or both, a
Hi Mike,
You are correct about the diode mis-naming of course. D8, not D6.
(Note to self: clean eyeglasses and laptop screen, and use better lighting when
reading schematics!)
The reverse polarity tests on D5 and D8 are concerning. Since there are
alternate parallel paths for current to flow o
For the first time that I can recall, I experienced my K3/100 reducing its TX
output power abruptly (from 95 watts down to maybe 5 watts) on first
transmission on a new frequency close to the one where the internal KAT3 ATU
was tuned. This occurred on multiple bands in this past weekend's ARRL
Thanks, Jack W6FB and Dave N8SBE, for your suggestions.
I've been diverted to other non-radio tasks for the past few days, and I hope
to conduct a more systematic exploration of the problem over the weekend. I'll
make some careful sweep measurements of the impedance presented to the KAT3 ATU
a
Hi Jim,
Thanks for your observation. I think that duplicates what I found by fooling
around during the SSB weekend. I tried retuning the ATU, of course, after the
'Hi SWR' message flashed, but that didn't restore full power. I don't have CW
in SSB enabled (because I so rarely operate SSB), b
Hi Bob,
Thanks for your comment. As I noted in our private email exchange, the Johnson
Matchbox was a last-minute substitution for an Elecraft BL-2 balun that was
overheating on some bands at 100 watts. I had not been using that
configuration previously, but faced with the choice of going QRP
Hi Chris,
Does the sub-RX also exhibit the same apparent loss of sensitivity in receive
mode on 17 meters?
Have you checked to be sure that somehow on the 17 meter band the rig is not
configured for a separate RX antenna via the KXV3 module? If it has been
inadvertently configured for that op
kip"] K6DGW
Sparks NV DM09dn
Washoe County
Michael Carter via Elecraft<mailto:elecraft@mailman.qth.net>
Tuesday, March 11, 2025 3:04 PM
Hi Bob,
Thanks for your comment. As I noted in our private email exchange, the Johnson
Matchbox was a last-minute substitution for an Elecraft BL-2 bal
With many thanks to those who offered suggestions on this topic, I am reporting
back what I've learned from myriad experiments over the past several days. I
apologize for the length of this post.
As I'd commented in a separate post, the arrangement of a Johnson Matchbox in
front of the KAT3 A
Hi Mike,
Sorry for the extended delay in responding - I have not given up on you!
I've done some more thinking about your measurements, and I did some
experiments of my own, although not on my KPA3A module. I was curious about the
difference in using 'diode test' and 'resistance' measurement me
Hi Wilson,
I hear your lament loud and clear.
First thing to check: reduce your TX output POWER setting to 10 watts or less.
Listen for relay click as the 100 watt PA module is disengaged. Does RX
sensitivity return? On transmit at 10 watts, do you measure that level with an
external power
Hi Mike,
I'm glad you were able to test receiver sensitivity loss again when the KPA3A
is engaged. If you have an XG3 or any reasonable signal generator with output
level around -73 dBm (S9 equivalent), you should be able to confirm sensitivity
on each band. Your tests indicate that diodes D2
Hi Rich,
No photos can be posted to this forum. Try the elecraft...@groups.io forum,
which does allow photos.
73,
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/m
Not disagreeing with the general advice Dick, W1REJ offered, but inspection of
the schematic of the KXV3B module (and I recall that the KXV3 and /3A versions
are similarly configured) reveals that if RX ANT is not selected on the front
panel, the RX ANT IN and RX ANT OUT ports are not connected
Hi Terry,
Check the sidetone source - in version of the MCU firmware prior to 2.04R there
is an option to select two different points in the hardware from which the
sidetone is sourced. One selection is specific to older K2 radios that do NOT
have the KIO2 interface (either in the K2 or in the
Hi Victor,
There was some old discussion on the Elecraft forum about output levels from
the KXV3 IF output port. The P3 designer, Lyle KK7P, indicated that the IF
output level is about the same as the signal input level at the K3 antenna
port. I've not encountered S9+60dB signals very often,
Hi Mike,
There are small RF chokes in series with most of the input/output jacks. Those
are susceptible to high voltage transients (e.g., ESD) and fail open. The
particular choke on the PTT IN line is RFC1 on the RF board.
73,
Mike, K8CN
___
Hello Wolfgang,
Thanks for including links to your audio captures of the distorted received
signals. The CW recording is more instructive, I think, but the SSB recording
has similar character. To me it sounds as though you're tuned to the sideband
of a wide CW signal, which I've heard on occa
This reflector has been strangely silent, and post I made yesterday has not
appeared, hence this test message.
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.
Hi Wolfgang,
You could try an experiment. Disconnect your K2, put it in a household oven
(not microwave oven!) at 100F for about 10-15 minutes, then remove it and
reconnect to your power supply and antenna. Check the audio on 40 meters
immediately upon finding a signal. If that doesn't repli
Another thought, Andy, after I re-read your post on this topic. The K3 permits
per-band TX power control. I wonder if you inadvertently got into that mode on
80 and 30 meters? It is easy to check in the menu system. That would be much
easier fix than looking into the bandpass filter bank.
7
Hi Andy,
What is the receive sensitivity like on those affected bands?
The 3.5 MHz and 10 MHz bands share no common components in either the bandpass
filter or lowpass filter sections. Those are usually the first line of
investigation for band specific lack of output power. If those bands hav
Thanks, Don, for clarifying the board structure on the K2. You noted that the
top and bottom covers need not be installed for the radio to still work
properly, and that is my recollection from repeated forays into my K2 for
module additions, etc.
So, going back to the original poster's (Wolfga
Hi Wolfgang,
Roger on all that. We'll be here when you have a chance to explore further.
It would be great if it never occurred again!
73,
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help
Hi Andy,
I looked back at your previous posts, but think I overlooked anything that
suggested that your K3 receiver is deaf on the 10 MHz band. Is it deaf on 10
MHz?
If you can inject a signal at 10.125 MHz and hear even a bit of it, that would
be useful information.
I'd leave the soldering i
I, too, have a hard time believing that the K2 main board is just 2 layers, but
perhaps others will know and remember. I'm not sure if I shined a strong light
through that board that I could see internal metal traces even if they existed!
Hopefully, Wolfgang has found the cause of his distorted
Hi Wolfgang,
Thanks for reporting back on your new findings. Your explanation is clear.
The standoffs likely provide localized grounding in that section of the RF
board. I'll have to look at the corresponding top-side circuit area to know
which circuits might be affected by lack of a local re
Hi Jim,
I do understand the concept of 'ground' versus paths for circuit return
currents, largely thanks to your writings and slide presentations!
My recollection is that the K2 main PCB does not have internal metal layers to
make up the kind of transmission lines needed to mitigate the issues
I like your conjecture, Don, simply because you have seen every conceivable
issue that occurred in the K2 over several decades!
Thanks again, and 73,
Mike, K8CN
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecr
99 matches
Mail list logo
