foot tower.
KA8IMZ
Michael Luberto
Sent from my iPhone
> On Jun 12, 2024, at 11:46 AM, Jerry Moore wrote:
>
> I have 30' run through my basement and want to eliminate potential
> interaction between the coax and power wires in the same area (don't ask). Is
> there any probl
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
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
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
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
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
. Will not ship.
No negotiations, no shipping, will not split up.
Jan-Michael Wyckoff
KA9FSM
jmwyck...@att.net
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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 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 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 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 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 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 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 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
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 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
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 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 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
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 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
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,
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
was
going wrong.
Michael, NO6O
On 2024-01-14 1:03 PM, David Gilbert wrote:
Fully agree. The specs for the CHA-250B say a maximum of 75 watts for
digital modes ... i.e., continuous duty modes. That pretty much says
what the actual heat dissipation capability is. If he was trying to
put 500 watts
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
. However, when I first hooked up the
KPA500, the SWR was not flat, and added the KAT500 this week, which led
to my SWR issue.
I hope the cause and resolution can be determined.
Michael
NO6O
On 2024-01-12 10:36 PM, Bill Johnson wrote:
Good advice
Bill
K9YEQ
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 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 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:
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
ted.
73, Mike W4EF
On 12/3/2023 7:41 PM, David Gilbert wrote:
Is your K3S connected to a computer (or some other significant piece
of electronics), and if so, are they tightly and closely bonded
together chassis wise?
73,
Dave AB7E
On 12/3/2023 8:11 PM, Michael Tope wrote:
Hi
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
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 All,
I noticed when operating the ARRL 160 contest this weekend that my K3S
has developed a nasty case of what appears to be some sort of LO
spurious. When tuning across strong signals, I can now hear a low-level
buzz (like phase noise reciprocal mixing) as I tune off them followed by
a
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
+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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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
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 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
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
Thanks very much, Dick!
73,
Mike, K8CN
From: Dick Dievendorff
Sent: Thursday, November 9, 2023 9:20 PM
To: Michael Carter
Cc: Elecraft Reflector Reflector
Subject: Re: [Elecraft] KPA3A and 6 meter TX Gain Calibration
CAUTION: This email originated from outside
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
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
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 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 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
https://k3bfp.com/?page_id=66=true
--
Michael Kelly
K3BFP
610-637-9055
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PLEASE FIND P# FOR SALE.
https://k3bfp.com/elecraftp3amateur-radio-gear-for-sale/
--
Michael Kelly
K3BFP
610-637-9055
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https://k3bfp.com/2023/10/25/elecraft-radios-and-gear-for-sale/
--
Michael Kelly
K3BFP
610-637-9055
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Post
I though i was subscribed to the list. Can figure out how to post .
thank you
--
Michael Kelly
K3BFP
610-637-9055
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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 Mike,
I would first reduce the TX power control
for a setting less than 10 watts. That will
bypass the KPA3 100 watt PA module via
the relay K1 on the KPAIO3 board.
If that restores your RX background signal
level to be comparable to that observed
when you put the same antenna on the
RX
Hi Steve,
Each attenuator section is designed
to present a 50 ohm input impedance
when terminated in 50 ohms. Of
course that will change as frequency
is increased and inductive effects
take greater prominence.
At what frequency(ies) did you
make your measurements?
What were the actual SWR
SOLD!
> On Sep 16, 2023, at 6:40 PM, Michael Gillen wrote:
>
> Sale pending.
>
>> On Sep 16, 2023, at 5:23 PM, Michael Gillen via Elecraft
>> wrote:
>>
>> Hello,
>>
>> For sale is my elecraft K3s station setup including K3s, KP
Sale pending.
> On Sep 16, 2023, at 5:23 PM, Michael Gillen via Elecraft
> wrote:
>
> Hello,
>
> For sale is my elecraft K3s station setup including K3s, KPA500, KAT500, and
> P3. Smoke free adult owned no contesting.
>
> I am the original owner of the K3s
available upon request.
Please contact me though my email address on QRZ.
Asking $5500 shipped CONUS from San Diego, CA area zip code 92075
Personal check or PayPal
If not sold in a few days I will split up the set.
73,
Michael
KK6RWK
_
Hi Jerry,
I had forgotten about the KRC2, Elecraft's
universal band decoder/relay driver unit,
so thanks to Jack, W6FB for reminding us.
The K2 uses five separate filter sections
(both for bandpass and lowpass selection),
and these do double duty for adjacent
ham bands. From my brief inspection
Hi Jerry,
There is no simple access to band data in
the K2 unless you want to reverse engineer
the AUXBUS protocol. Depending on how
your homebrew amp selects its lowpass
filter options, you may be able to pick up
the relay control signals for the K2's bandpass
and lowpass filter banks and use
Hi Erik,
Did you check the filter selection for
the sub-receiver to be sure you don't
have a blank slot selected for SSB?
73,
Mike, K8CN
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Thanks, Geert Jan, for recounting the 'origin story'
of the K2 'twins', the outboard combination of the
KPA100 and KAT100. I had not previously heard
of the origin and Lyle's (KK7P) role in that process.
I hope Larry can provide more detail about
the actual configuration of his outboard
KPA100.
Hi Larry,
You mention in the title '...Power Surge Advice.'
I presume your KPA100 was working properly
prior to not powering up?
You also describe the connection from your power supply to
the KPA100 and then to the K2 - does this
imply a Y-connection from the power supply
to both the K2 and
Thanks very much, Eric, for the comprehensive
update!
73,
Mike, K8CN
(especially glad to know about the KPA3A
being close to shipping)
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Hi Paul,
It does sound as though the slug-tuned inductors
on the 20 meter and 15 meter sections of the
Filter board need tweaking. As you noted, one
must remove the KAT1 ATU board from the
Filter board to access those coils. It is necessary
to jumper pins 2 and 10 of J2 on the Filter board
to
Hi Jim,
Does your K3 have the KXV3 interface
or KRX3 subreceiver options installed?
If so, I would check the menu settings
to be sure that the rig doesn't have
the RX antenna port selected as its
antenna source and that the subreceiver
isn't the primary receiver.
If it's not a menu setting
Hi Allan,
In your original post you said your
K2 seemed somewhat 'deaf.'
Does that mean you hear no signals at
all on any band, no signals on one or
two bands, or just weak audio with
antenna or signal generator input?
Since your K2 has the K160RX option,
I would check that the RX antenna
is
K4D in operation at the Mike & Key GOTA station
https://photos.app.goo.gl/q9T96tUYEwVQhtaq9
https://photos.app.goo.gl/KV3ChVQ7JJSa8vsf9
https://photos.app.goo.gl/wJrLrryYkPrh7t1C8
On 6/30/2023 12:40 PM, Dave New, N8SBE wrote:
Eric,
I promised Margaret some 'in action' K4D Field Day
Eric posted to this forum in early March 2023.
I believe his estimates of availability for various
modules are reflected in the current Shipping Status
information on the Elecraft web page. Suffice to
say that only a few module types have shipped
at this juncture. Some of his estimates were
in
Hi George,
Congratulations on your excellent sleuthing!
Regardless of which solder joints were
reflowed to solve the problem, you found
the troublesome one(s).
Thanks, too, for reporting back to the
reflector - it helps to spread the knowledge
base.
73,
Mike, K8CN
Just curious if there is a new update coming out this week
since it has been 3 months since the last update (presuming
I didn't miss an update and understanding that Elecraft has
been traveling to various ham conventions)?
73,
Mike, K8CN
the
frequency etc.
vy 73,
Michael (DG3NAB)
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Hi Mike,
I saw that you had posted a similar question
in January 2023 and had some suggestions
including running the TX Gain calibration, which
you did, but apparently without effect on the
spiking.
There have been numerous reports of
TX power spikes on first dit or first voice sound.
Some found
I have for sale a very nice KPA-500, looks very good works as it should.
$1995.00 We will be at Hamvention next week. Prefer Cashier's check or MO.
contact KN9P off list, good on QRZ. 920-853-7073
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Hi Lee,
Do you also have a reduced RX signal level
on 30 meters as well as 20 meters, at least
by comparison with your KX3?
Since the TX output is OK, I will hazard a
guess that one of the relays in the
20/30M bandpass filter is not making
good contact or has developed a weak
solder joint on the
Hello All,
I am looking to see if there is anyone out there interested in upgrading their
KPA500/KAT500 to the KPA1500 (plus some $). I really don’t need a legal limit
amp so I thought first I would check here to see if there is some interest.
Thanks for looking!
Michael
KK6RWK
Solana Beach
Hi OM,
I would first disconnect anything connected to the
rear panel ACC connector - pin 8 may inhibit
the PWR_ON signal. If nothing is connected
to the ACC jack, I would try temporarily grounding
the end of R77 (the other end attaches to pin 4
of Q2), which is the /PWR_ON signal. If that
fails
Hi Jerry,
First, a couple of questions:
-- does the abrupt loss of power occur if you operate
with the TX PWR set to less than 12 watts on
15 meters? This engages only the low power
driver amplifier and takes the 100 watt PA module
out of the picture.
-- if you're operating on 15 meters at the
Hi Rick,
I've not experienced the problem you described,
but I've also not used my K3 as a remote front panel
for another K3.
Have you checked pin 8 of the ACC connector to
be sure that it is not held 'high' by some chance
(not likely since you pulled all the cables)?
If there isn't a problem
Hello, all.
This may be my first post to the reflector. I received the KXIBC2 module
yesterday and installed it in the KX2 this morning. A few notes from the
process…
1. Installation is pretty straight forward. Soldering the B and E pins is a
little tricky but not too bad. I pre-tinned pin E,
Hi Jim,
Since the bypass relay actuates, can you check the
KPA3 (or KPA3A, depending on which generation
of K3 you have) input side of the relay to verify
that the relay is doing its job, i.e. that RF is making
it onto the KPA3 input? A scope is best,
but a simple RF probe and DMM would also
My previous post under this thread elicited
a private response from Kent, K9ZTV who
noted the same concern expressed by others
publicly about using the TUNE button
with the PWR control set ** exactly **
at 5.0 W or 50 W. I thank Kent for piquing
my curiosity about this issue because I
had not
Hi Dick,
By 'not working' I presume you mean that advancing
the TX Power control above 12 watts does not yield
increasing TX power output?
Does advancing the TX Power control above 12 watts
produce any increased TX output power or none at all? Here
I presume you have an external wattmeter with
Hi Dave,
The K3s (and K3) bypasses the 100 watt PA module
when you set the Power control to less than 11
watts and relies on the KLPA3A 10 watt PA driver module.
No harm will come to the K3s when operating
at 5 watts presuming you have an SWR within
spec for the K3s.
I used a simple optocoupler
Hi Mark,
It sounds like self-induced RFI, but occurrence at a very low
nominal TX power is suspicious. Can you say more about:
-- antenna(s) in use
-- any external or internal ATU in use
-- connections to your K2 other than antenna, DC power, and key/paddle?
73,
Mike, K8CN
Thanks for the update on your visual inspections, George.
Best wishes for the holidays!
73,
Mike, K8CN
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Hi All
I have a K3/0 Control Head for sale, s/n 246.
It has all the cables that go with it.
It came off a remote station that was parted out. The radio went one way,
and the RemoteRig went another way.
Please email me off list if you are seriously interested. My preference is
to ship to
"Clearly case of stimulation of overactive ham hormone resisting disposal of
anything looking potentially useful."
Ed, your characterization of this personality quirk is the
best explanation I've seen yet - I'll share it with my XYL,
although I doubt it will temper her (un)enthusiasm for
my
Hi George,
Your test confirmed that the low-power amp (K3 LPA) survives.
To clarify, do you have the K3 or K3s?
The original 100 watt PA (KPA3) used RF BJTs as the finals,
whereas the KPA3A used RF MOSFETs (LDMOS).
Apart from failure of one of the PA final transistors,
the loss of TX output
Not really.
Just label the wires so you know were to put them when it comes back.
Undo the bolt and pull the big torroid out. You'll notice the KPA500 is a
lot lighter now. :)
73, mike va3mw
On Tue, Nov 22, 2022 at 6:42 AM wrote:
> I am sending my KPA500 to Watsonville for service. The
Thanks, Wes!
As a 99.9% CW operator,
I never looked into the Tech Mode options
for SSB testing in my K3. That's a really useful
feature! It's good to be reminded of the
built-in troubleshooting utilities in the K3.
73,
Mike, K8CN
Hi Martin,
Do you observe (or hear) sidebands outside
the nominal transmitted bandwidth with
CW transmissions or only SSB transmissions?
Can you perform a 2-tone test with an
audio source other than speech?
The fact that the unwanted sidebands
are not observed when the KPA3 100
watt amplifier
Hi John
I have used Com ports on Win 11 without issue. If you have one, you will
want to check in device manager and see if you see the port.
73, Mike va3mw
On Wed, Oct 19, 2022 at 5:28 PM John Chappell G3XRJ wrote:
> Can anybody confirm that Elecraft W2 software runs on a Windows 11 PC.
>
Hi Eric,
I'm voting with my friend Dave, K1WHS,
for looking first at the voltage regulators.
The 8 volt regulator supplies the TC4427
gate driver IC, which in turn provides 7R/7T voltages
separately to the Transmit and Receive switching circuits.
The loss of the 7R/7T voltages would disable the
sure you
understand why) all sales by bank check or cash.
--
Michael Kelly
K3BFP
mich...@k3bfp.com
610-806-0663
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