I too have a Field Test K2 S/N 00020 that is fully upgraded and tuned.
It has all options except the KPA100 installed. It also has the now
unavailable K2XV transceiver interface and a Keyout Jack on the rear
panel. Functionally it is equal to a newly built K2 plus options that
are now
Season's greetings from the Left Coast. Hope everyone is having a great holiday!
Meanwhile--with apologies for the bandwidth:
K2 S/N 1 is among the early Elecraft radios I've had in cold storage.
Unboxing it brought back fond memories from 1999, the year we started shipping,
back when
Allan,
Just as I indicated in my last post, set L30 slug midway and then adjust
the spacing of the red turns on T5 until you get close to 6 volts, and
then adjust L30 to finish up.
73,
Don W3FPR
On 10/3/2023 6:16 AM, Allan Forster wrote:
Hi,
I received a replacement variable inductor
message:
From: Allan Forster
Date: 25 September 2023 at 14:21:18 BST
To: elecraft@mailman.qth.net
Subject: [Elecraft] Elecraft K2 serial number 7699
Sorry, made a mistake and used the wrong frequency while attempting to set up
the VXO.
Now the voltage at R30 is 4.3volts and does not change when
Allan,
Contact k2supp...@elecraft.com about that problem - in the meantime, do
not wear out the core of L30, just set it to about the halfway location.
Instead compress or spread the red turns of T5 to see if you can obtain
the proper R30 voltage.
It is not likely that L30 is the fault, but
Sorry, made a mistake and used the wrong frequency while attempting to set up
the VXO.
Now the voltage at R30 is 4.3volts and does not change when adjusting L30.
Previous post
‘ I have got to the VCO alignment stage of aligning my K2.
I have got 7.4 volts on R30, this does not change when
Hi,
I have got to the VCO alignment stage of aligning my K2.
I have got 7.4 volts on R30, this does not change when turning the core in L30.
The core moves but does not appear to move up or down so I suspect that the
VCO inductor is damaged.
Does anyone know where I can get a replacement?
[Submitted this earlier today with a picture attached of "how I made
mine", however it seems the picture is causing the message to bounce, so
now sending w/o picture]
Is your K2 one with a PA Key out? If so, just an RCA cable and a coax
jumper.
If your K2 is a K2/100 then it will have PA
Doug,
I have SN 00020 which is a field test model, and I suspect that it is
not much different than Wayne's SN 1.
The boards are relatively clean, and I do have all the FT mods (not
many) plus all the K2 A to B mods installed. Most of the FT mods were
component value changes.
There are
It would be great to see a picture of the circuit boards of that radio!
Taking into account 20+ years of of ECOs and experimental mods, I am
visualizing lots of jumpers and random capacitors…
Doug, w0uhu.
Message: 8
Date: Mon, 18 May 2020 12:43:36 -0700
From: Wayne Burdick
Brad,
It is good to hear you are using the special cable. Do NOT plug a
standard serial cable into the AUX IO connector, that can damage both
the K2 and the serial port.
First, check to see if the PORT menu setting is ON.
That is in the secondary menu (enter the menu and tap display to get
Remembering that the DB9 jack on the back of the K2 is not RS232, if an
RS232 device like a USB/serial cable was ever plugged in directly, stuff
can be smoked, and on both ends of the serial cable. Most of the pins are
used to talk to the 100w amp and tuner mounted externally.
Voltmeter sounds
While I continue to review the list archives, I am requesting feedback from the
group with regard to possible failure modes of the KIO2 board. This rig is in
loan to me, with the loaner stating that it was claimed working when he
acquired it from a previous owner, but had not himself tested
For Sale – Elecraft K2/10 Transceiver, Serial #6099
Includes the following options:
K160RX 160M option with 2nd RX antenna port
KNB2 High Performance Noise Blanker
KAF2 Audio Filter and Real-time Clock
KAT2 Internal Antenna Tuner with 2 Antenna ports
KIO2 RS232 Interface and Aux IO with cable
Over Elecrafted!
Me too with the full K-Line, a KX3 and my K2, all built from kits.
I just can't part with my K2, a great nostalgia build yes including
winding all toroids, but one had to go.
Sold my KX3 !
Forgotten just how good the K2 receiver is, amazing and sounds so sweet!
73, Deni -
That would be tough for me, Deni: I've become too
panadapter-addicted :-)
73, Phil W7OX
On 1/10/15 1:04 AM, F5vjc wrote:
Over Elecrafted!
Me too with the full K-Line, a KX3 and my K2,
all built from kits.
I just can't part with my K2, a great nostalgia
build yes including winding all
OK, got to share with you folks a new one for me.
Many of you know that I love to trade radios.
Someday.. I may even trade off s/n 5702, which is a K2/100 but.. not just yet
for that much wanted KX3...
Today, I got an opportunity to purchase another K2. I was told that the guy
worked for
Incredible, Fred. I keep thinking I should sell
my K2 (#380) -- with all options including KDSP2,
KPA100 KAT100, and all updates - even the MAB
and Mic adapter board -- but each time I consider
it the nostalgia sets in: Loved building it. OTOH
-- with an all up K3 system and a KX3/PX3 for
I couple of weeks ago I came on here about a VCO problem I was experiencing
when testing the VCO on my K2. The solution was a hard resent of the K2. Since
then, it’s been plain sailing. The only piece I “lost” after the 11 years this
has sat in a box waiting to be built was the 20m bandpass
Good for you, Gareth. Building my K2/100 #380 over
about a four year period as elements became
available may have been the most fun I've had in
60 years of ham radio. I'm still updating it
(pretty much done with that, now) and adding
things (like the MAB) for more functionality.
Have fun!
Hello All,
I picked up a partially completed K2 from an SK sale. I finished adding
the missing parts.
The serial number was never put on. Is there a way to determine the
serial number?
Tom Bryan
N3AJA
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Elecraft mailing list
Tom,
If you know the original purchaser (and to help, the approximate date of
purchase), the folks at Elecraft may be able to dig that out of their
files. Send an email to sa...@elecraft.com to inquire. A new serial
number sticker can be made for a nominal price ($1 or $2 if I recall).
Bryan,
I don't believe you can determine the original serial number without the
original packing slip/invoice. Alternatively, Elecraft -may- be able to look
it up, if you have the original owner's name and/or call sign. If you -can-
determine the serial number, a replacement sticker can be
As the title suggests, I have installed P! on the RF board on the wrong side
of the board. I am sure that I lack the skill and equipment to remove the
connector now that I have made this serious error. What do I do now?
Thanks in advance.
Jerry,
The best way to recover is to remove the plastic from the P1 body and
then remove the pins from the board one at a time. You may be able to
slide the plastic bar off, but if not, break it with your cutters.
Clean up with solder wick, and if solder remains in the holes, a heated
You do not lack the skill needed, but you will need a new connector! You can
get one from
Elecraft.
Cut the old one off with your flush-cutting wire cutters. Just cut through the
plastic.
Then remove the pins one at a time. Clean the holes with solder wick. Install
the new one.
That's it.
I'm ashamed to say I did the same to my K1 recently!
I contacted Elecraft support and Gary advised I pull off the plastic
covering for the connector with pliers, and then remove the pins one by one.
I suggest you Email them pronto!
73
RayG3XLG
-
Ray G3XLG
--
View this message in context:
I have two K2s (one for casual, one for dress . Both have the serial I/O
unit. One works fine the other not so much. The one with the problem is not
working with Fldigi (using any of the CAT interfaces). No commands appear to
be flowing in either direction. I actually don't know if the serial I/O
Casey,
The first thing to do is swap the cables - you may have a wiring problem
with the K2 serial cable.
If the cable is not the problem, tell me if you are dealing with a KIO2
option in a 10 watt K2 or the equivalent in a KPA100 and I can give you
some DC tests to perform.
73,
Don W3FPR
The summer has ended and construction has begun on K2/10 006980.
Currently doing a detailed inventory.
Stan Levandowski WB2LQF
HF QRP CW -- Doing more with less for over 50 years!
QCWA #35038 OOTC #4558 NAQCC #4740 SKCC #6488 FISTS #(Pending)
Hi All,
I'm in the process of assembling the KI02 serial interface
for my K2. So far, so good, but I see a potential problem
coming up. Maybe I've overlooked something, but I don't see
how the speaker gets re-attached without interfering with
the aux. board. The speaker connector seems too
Dave,
I believe you are overthinking things (or looking at the wrong P5).
Unless you have installed a ty-wrap on the speaker lead and the KIO2
cable quite close to the AUX board there should be no interference.
The P5 that the speaker plugs into is on the RF Board, not on the
Control Board.
Gads! Don Wilhelm is absolutely right (of course)! The
speaker plugs into the RF board, not the control board.
I've only had this radio apart a dozen times or so--you'd
think I'd be able to do it blindfolded! My only excuse is
that I disconnected it two days ago, got sidetracked, and
then
For sale, K2 Ser 5600 with the following options:
KSB2 SSB, KNB2 noise blanker, KAF-2 Audio Filter,
KAT-2 20w Auto Tuner, KIO2 Rs232 Interface,
Amp keying board, Osc Shielding Kit., K160RX 160M.
I spent 2 weeks assembling this excellent kit.
I've worked in the electronics field since
Does anyone have a K2 Serial interface for sale? Maybe you added the 100 watt
module and have a spare one laying around? Let me know off list if you have
one for sale and what the price is. Email me at
[EMAIL PROTECTED]
73,
Ken/NO4D
--
View this message in context:
Thanks to all that responded.
Peter, AC7SB, was a great help. As it turns out the CW sidetone source was
selected to U6-25. That is where the data has to come from. Moving it back to
U8-4 in the ST L menu did the trick. Now my only mystery is when/how/why did
it change from default in the
I've been using HRD and DM780 for a few months now on my new K2. It
has worked wonderfully. Suddenly I can no longer connect to the
radio.
I have checked and rechecked settings and connections. I'm using a
USB to serial adapter, but its the same one I have always used and it
works on other
Jim,
It could be either the computer (and serial adapter), or it could be the
K2 itself.
The best way to proceed is to check using the simplest configuration -
try the communications tests outlined in the KIO2 manual. It would be
best if you can try it with a computer having a real serial
The K2 has been SOLD... Thanks everyone ...
73 Bob W7WO
Hi,
My K2 is for sale for $925 shipped continental U.S.A
Configuration: (kit prices shown only for reference)
K2 #4400 HF Transceiver - $629.00
KAT2 K2 20W Internal Auto Tuner - $169.00
KBT2 K2 Internal 2.9AH Battery Kit -
K2/100 S/N 6205, fully fitted with all options, is now qrv. This is the best
rig I have owned (previous was FT102 which is no slouch in the Rx
department). I was immediately convinced by its performance on 40m this
evening.
Elecraft - I am now your greatest fan!
Minor glitches with the various
Sorry, think there may be a couple of 100 others you claim that :-)
On 6/9/07 17:18, Barry Horning [EMAIL PROTECTED] sent:
Elecraft - I am now your greatest fan!
--
Once upon a time a man whose axe was missing suspected his neighbour's son.
The boy walked like a thief, looked like a thief,
What are they parameters for the K2 serial ie. baud rate, data bits, parity,
stop bits, and flow control?
--
W2CVZ,
Michael
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Michael,
What? You can't look it up yourself? You can't ask me?
Check the Elecraft website for the manuals. The command set is
documented in the KIO2 Programmer's Reference manual, the comm
parameters are in the KIO2 manual.
KIO2 manual (with baud rate, etc)
Some of us will be nice...
4800 bps, 7 data bits, although 8 will work (you will need to strip
off the msb). 1 stop bit (2 will work), no parity, no flow control.
It is a very forgiving interface for low-level format.
The info is in the KIO2 manual and detailed info in the KIO2
No they have not. I spoke with Lisa on Friday, and I was her last order
of the day. On the shelf, she had serial numbers 5982, 5983, 5984, and
5985. Of which I took 5982. She said 6000 should be in the next
batch of kits that are put together.
David Wilburn
[EMAIL PROTECTED]
Darrell
Does anyone know if the K2's have passed Serial Number 6000 yet? I noticed
that there were substanstial changes with SN 3000. Is there any word about
design changes being included in K2/100 SN6000+ that are not in SN5999 and
below? I am ready to buy a fully loaded K2/100 and am very interested
I recently bought a used K2 serial number 1661 and as a long shot
thought I would check to see if the person(s) who owned and/or built it
might still be monitoring this list. If so I would like to communicate
off the list to find out a little more about this particular radio..
Thanks and Happy
Hello All,
K2 Serial# 5783 Takes it's first breath(It's alive)
Started working on it about 21/2 weeks ago in spare time and the basic K2 and
now has a good pulse. I should say I have gotten as far as tuning up the 40m
section. Today I will finish rest of the tunning and
Just completed building my K2 Serial #05622 with NB and SSB options
installed
it went together smoothly, the problems was some distortion caused by the
built in speaker. Bending the frame slightly solved the problem for now.
Just received a replacement speaker thanks to Elecraft customer service
Bob, WB2SRF wrote:
Just completed building my K2 Serial #05622 with NB and SSB options
installed it went together smoothly, the problems was some distortion caused
by the built in speaker. Bending the frame slightly solved the problem for
now. Just received a replacement speaker thanks to
Darwin, Keith wrote:
Come to think of it, who ever decided that keeping track of SNs was a
good idea? I've seen interest in SNs with other rigs but only to
identify new vs. old and whether a rig has the latest mods or not. But
then I guess Elecraft is not like other rigs.
That makes them
Gee, I keep feeling like I have a new K2 but SN 5411 is almost 200
behind the lead runner at this point. By the end of the year we will
probably pass the 6000 mark. Maybe I should start timing it now so I
can get SN 6000?
Come to think of it, who ever decided that keeping track of SNs was a
Just FYI, my K2-to-be is #5601. Having it built for
me. Hoping to have it somewhere mid-July to a little
after that.
FWIW, will have:
K2 - QRP version
KAF2 - K2 Audio filter and Real Time Clock
KBT2 - K2 Internal 2.9AH Battery Kit
KIO2 - K2 AUX I/O RS-232 Interface
KSB2 - K2 SSB
I have often wondered if serial numbers on today's radios run sequential.
Seems like they may skip numbers to make us think they sell more than they
actually do.
I wonder mostly about the Ken,IC and Yaesu.
Al
W4ABW
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For those that have an interest in the current K2 serial numbers,
today I received K2 kit #5600.
I did a look see glance over inventory as per the instructions but I
dont see any type of 12V DC power cord? Radio shack -- for me -- is a
110 mile round trip drive. So no power cord
Houston, TX
K2 S/N 4216
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, June 27, 2006 7:45 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 Serial # 5600
For those that have an interest in the current K2 serial
Ouch! And I complain about it being 6 miles to the nearest Radio Shack!
Anyway, for a QRP K2 any decent zip cord from the hardware store or just
about anything you can scrounge is FB. Cord is supplied with the KPA100
since that requires heavy-duty stuff to handle the 15 amps or so the
KPA100+K2
Just finished this K2/100 for LA2CFA in Norway! It also includes the 60
meter option and
an XV144 Transverter.
Currently I am testing it and hope to ship it out this week.
Michael
N2ZDB
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