Is there a wiring diagram for the optimum K3 RS-232 cable anywhere?
I know people are saying use a standard serial cable...
For normal use, you just needs pins 2, 3 and 5, plus the shield to the
connector shell.
If you want to support DTR or RTS signaling (for PTT and/or KEY from a
logging
Hello Doc!
Is this an issue with earlier versions of the KDSP2? I hear
no thump with either the KDSP2 or KAF2.or with out either
installed
With some K2s operating QSK there have been reports of a pop or click at the
switchover to receive. It is related to the different delay
OK, this is off-topic, so I'll keep it brief.
AMSAT-OSCAR Echo was launched from the Baikonur Cosomodrome in Kazakhstan on
2004 June 29 at 0630 UTC, inserted into orbit at 0645, and first
communications were established at 1452 when it passed over the US in range
of the command station(s).
Echo
I recently took a trip and did not take my KX1 because I was
concerned about potential problems at the airports. I would
like to hear about the experiences of others who have
traveled by plane with ham equipment.
I took my K2 to New Zelanad earlier this year, no problem.
And last
I want to take the KX1 traveling with me, can the unit be
used in airports and on planes with out causing any problems.
I don't want to get arrested because it will interfere with
aeronautical sensitive electronics.
You can *transport* it on aircraft, but don't even think about *using* it
Do you have a recommended favorite that is plug-to-plug
exchangeable and available. That is, I've heard praise of the
Yeasu knob, but also that it isn't available from any
supplier anymore. Also, I read one article about a
substitution which required an additional fiber
washer - don't
I need help with this one. During the entire construction
process everything went fine until the very last step; I
wired up the internal speaker, powered on and the audio
sounded horrible. Very raspy with cw signals having a hollow,
high pitched ring to them. ..
The magnet is very heavy
The magnet is very heavy in the K2 speaker, and the frame
often gets distorted (bent) as a result.
Let me clarify. The speaker frame can get distorted in shipping while not
installed in the radio. I've never had a repeat problem after correcting
the initial distortion.
Lyle KK7P
I'm helping a friend out who bought a 222 transverter from
Elecraft but wants to use it with his TS850S. The 850 will
only go down to 9 watts and the Elecraft wants a max of 8
watts, any help out there???
The TS-850S doesn't have such an output, at least not according to the
manual that
But, I need to find an LM7805 in the small wee package the
comes with the K2s. I have been to Mouse and all they have
is the TO-220 at 1A.
Search for 78L05 and you'll find plenty of them at Mouser and Digikey.
Lyle KK7P
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OK, this may be a silly question but... Why do I need a KIO
to run the KPA100 remotely?
The auxbus must be connected between the K2 and the KPA100. The auxbus is
conveniently brought out on the KIO2.
73,
Lyle KK7P
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I'm currently building up the KPA100 for my K2 and am becoming
inceasingly frustrated at my own inability to locate component sites on
the board.
If somebody has the expertise, time and willingness, a great tool would
be a web site where you could simply type in U1, R12, C34 or whatever
and
Can I keep the 20W tuner
in the rig if I put in the KPA100 and just put it in CALP mode?
The 20W tuner won't fit in the K2 with the KPA100. But you can keep the
20W tuner in the K2 if the KPA100 is remoted.
All of the posts I have seen regarding remoting the KPA100 always
include the
What does E13.1 mean? Where can I get a listing of the error codes?
The AFIL seems to work fine. Help.
Not an error code. 13.1 is the supply voltage and 0.40 is the current.
However, you should get that on the second tap and the DSP information
on the first tap. A third tap should return
Lyle, you understand my DSP access problem, but what do you mean by drill
down to the K2's real time clock menu item and turn it on?
The K2 (not the KDSP2) must have the real time clock display enabled for
you to see the KDSP2 menus. See Initial Checkout on page 18 of the
KDSP2 manual for
Hello Herb!
I found the elecraft web and have noticed that all that
is posted is troubles with kits. Is this common ?
The Elecraft reflector is useful for folks who have questions or are
looking for help.
The kits are straightforward to construct, and there is plenty of help
available
When I tap DISPLAY and get S1 nr nt I hear a raspy tone ticking off the
seconds. It is present in any DSP or time mode. It is loud enough to be
annoying. This phenomenon only occurs on 60 meters. Has anyone else experienced
this? Is it normal?
Yes, this is normal. The KDSP2 pretends
Hello Vic!
I am hearing a click in my 'phones or speaker when the
K2/100 unmutes in CW mode.
There was a mod for this when the DSP is on. It may be
that your unit is on the edge and the KPA100 being active
pushes the timing slightly. You might look at the
Unofficial Elecraft Mods page
Hello Tim!
SA602 and SA612 are interchangeable in the K2.
73,
Lyle KK7P
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Finally had a chance to work on some of my kits.
I had completed the DSP kit and just now am installing
it.
No smoke
That's good!
but the red LED remains on.
That's not so good.
...
Any suggestions?
The LED comes on when the DSPx resets, and goes off when it handshakes
with U1 on the
Chuck Gehring wrote:
I need some recommendations. The KDSP2 instructions state to install C5,
C8,C3, and C4 with the capacitor flush to tje PCB with the exposed leads not
more than 1/32 (1mm) above the PCB. Could someone please tell me how they
accomplished this task. The best I can mamage
Hello Chris!
I have just built the KDSP2 and everything seems to work properly,
including the clock and changing the filter frfequencies.
However, the red LED remains on...
This is certainly peculiar. If the DSP is working, the first thing it
does is turns off the LED. This feature is
We already have a DSP option costing $300 which many
people think as very important and continue buying.
Actually, it is a paltry $219 :-)
Lyle KK7P/VK6
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I'm getting close to order a K2 but I have a few
questions.
The K2 would be for CW operation only.
...
I have decided not to order the DSP filter but perhaps
the passive
audio filter. The passive audio filter appears to be
set up for
80hz bandwidth which is way too narrow for my
Is it possible to purchase the power amp and tuner, build 'em both in a
single enclosure and operate them from the K2 while leaving the K2 in a pure
QRP state?
See http://home.pacbell.net/johngreb/k2_100_in_ec2.pdf and
http://www.kk7p.com/k2kpa100.html.
73,
Lyle, KK7P
Hello Neal,
I cannot get the initializing led to flicker on my kdsp2.
When I do the voltage checks, I really cannot make sense\
of it, versus the schematic.
Any clues?
Here are a couple of things to try:
1) Turn the K2 on.
2) Be sure the rtc menu item is on, per page 18 of the KDSP2
How difficult is building the DSP module.I see the A/D D/A board is
built.Excellent!
How about the rest of the DSP.I see there is a larger board under the
a/d;;d/a board
Consider downloading the KDSP2 manual from the Elecraft website and
looking it over. The kit portion is pretty
...Assuming the use of strong mixers (+50dbm)...
Hmmm. +50 dBm = +20 dBW = 100 watts! That's some mixer!!!
...Great will be the day when a DSP unit running at VHF,
with a high IP3in etc, and low noise figure becomes practical.
An interesting approach to this is the SDR-14 from rfspace.
Hello Fred!
... When setting up the audio filters, I would
like to be able to select GAIN settings for each filter
bandwidth...
If I could have different Gain settings for each filter
bandwidth, then I could set up a variable CW PEAKING filter
that could have progressively higher Gain for
Hello Jim!
...I hope
I can remember how to wade thru all the DSPx menu's
while actually operating.
Once you have the unit set to your liking -- and the defaults may be
very close -- you can cycle through 4 filter selections using the AFIL
button on the K2. Ad you can toggle the
So, why put up with the hassles that IR brings when we can move to RF
using technologies such as BlueTooth or ZigBee, and be able to move
around at will?
Sadly, the Bluetooth serial port adapters all seem to require 45 mA to
50 mA -- I checked several manufacturers. OK for the shack, not
Elecraft K2/100 = S9 (digital S-meter)
Yaesu FT-1000MP = S9 (main and sub rx's, digital S-meters)
Icom IC-756Pro3 = S9+3 dB (analog S-meter), S9 (digital S-meter)
Kenwood TS-830S = S9+3 dB (analog S-meter) (1 uV setting = S4)
Years ago I calibrated the S-meter in the TS-830S using a
Hello Larry!
I am very interested in one if you have any left. DO you
accept paypal?
tnx es 73,
Lyle KK7P
On Mon, 25 Apr 2005 13:00:24 -0400
L. D. Ingram [EMAIL PROTECTED] wrote:
Hi,
A few months ago I let everyone know that I had some
salvaged variacs in excellent condition - they
if I have a very strong station nearby while I'm using
OP1 on Tx Rx and a very narrow DSP filter I may not
get the best function out of the filtering.
The AGC would see the wider bandwidth while the computer running PSK31
or whatever mode you are using would see the narrow bandwidth, so
...before I tackle the K2 I
need a really good swing arm magnifier - looking at the type that has a ring
fluorescent lamp around it - but that's not an absolute requirement.
I have never had good luck with these, and long ago I settled on the
Optivisor with 5 (diopter?) lensplate. They cost
in the schematic of K2 ( control board ) there is the signal
DAC2CS???
DAC2 chip select: this is the signal that lets the PIC processor on the
control board load values to U5 on the RF board, a digital-to-analog
converter (DAC) which is used to change the frequency of the PLL
reference
First of all, you are correct, it is corrosion. I have used plenty of
Kester Organic Core Solder, Flux 331. I still use it a lot.
The rules I follow are:
1) note the time the first solder joint is made.
2) not more than 1 hour later I take the work in progress to the sink
and run lots of
I ask this in all seriousness; and with no disrespect. But am I
missing something here? Why would folks use this stuff if it's such a
pain in the butt?
I believe that it's normally used with automated soldering equipment,
and the boards are washed in a hot water bath after soldering. I
Can these inductors be installed in either direction or must they be
installed in a specific way like a diode would be?
Either way is fine.
Lyle KK7P
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The question is, if the SWR is not 1:1, does the power reading which is
based on the voltage in a 50 ohms load read high or low?
It depends :-)
If the SWR is 2:1 and is caused by low impedance (e.g., 25 ohm load)
then the voltage will be lower for a given power. If the SWR is caused
by a
1. Does my thru-line wattmeter indicate RMS or P-P power?
Typically RMS, but there is a time constant involved in the meter
movement, and some versions are/can be peak reading. Keep in mind that
most wattmeters, thru-line included, don't actually measure power but
voltage induced in a
... I just installed the KDSP2, and based on the manual the auxbus
isn't communicating with the dsp unit. I seem to be able to use the
default filters, but when I hit display I still get the voltage and
current readout. Also I think I was supposed to get a clock setting
routine when I first
The DSP is incredible. Especially after I studied the manual and
fiqured out some of the basic procedures, like knocking the noise
reduction in and out quickly on CW, changing the center frequency, etc.
Keep in mind the front panel shortcut with the latest K2 firmware.
AFIL+REC will toggle
Hello Ron!
If you look at pictures of the old 707 or 720, you'll often see a
stinger pointing forward from the top of the vertical stabilizer. This
is an HF antenna.
There was often a stinger pointing aft on a wingtip of a 747 (before the
400 series aircraft). This, too, was an HF antenna.
Hello Tony!
Tried the shortcuts listed below. I just get a message - not inst. Yet the
DSP works fine. Any thoughts? I have software versions 2.04P, 1.09
Keep in mind the front panel shortcut with the latest K2 firmware.
AFIL+REC will toggle the denoiser on and off without being in the DSP
Hello Tony!
I get the same message no matter whether in CW or SSB modes.
Then I suspect you have older DSP firmware. The current version, which
supports the front panel shortcuts, is Ctl 3.10 Please see the KDSP2
errata sheet on the Elecraft website in the Manuals section.
73,
Lyle
I am thinking seriously about putting my KPA100 and KAT100 in an
external EC2. I checked the original link and I don't seem to be able
to get to it. Can anyone let me have any info please?
Try http://kk7p.com/k2kpa100.html and
http://home.pacbell.net/johngreb/KI6WX.html
73,
Lyle KK7P
What do you guys think? Also, is there a support group for those who
are addicted to building these things?
Paul, you might want to read this link.
http://lists.stevens.com/pipermail/hqrp/2003/000898.html
There may be hope...
73,
Lyle KK7P
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I bought Silver-Bearing Solder at Radio Shack (.022 dia, 62/36/2, #64-013E)
and now, after reading so much on what I used to think was a pretty simple
subject, Rosin Core: Good, Acid Core: Bad, I wonder if what I bought is OK?
If the solder is has a rosin (or resin) or no clean core -- be it
I noticed this at Field Day. The club was using a repeater with output
on 146.625. As soon as I turned on the K2 we got hash on that
frequency.
Any suggestions for tracking this down?
You must have an older KIO2 with the 16.289 MHz oscillator. The 9th
harmonic is 146.60 MHz.
You can change
Hello Bill!
I have adjusted the dsp aggressiveness from 1 to 99 , and while
noticing the difference I cannot seem to minimize the NR .
Be sure to try all four levels of denoiser (page 24 of the KDSP2 manual)
as well as the beta and decay (pages 30-31).
Is there a way to return to
At the same time, the fastest
code test I passed was 13 WPM for my General in 1974, so there are probably
some 20 WPM Extras out there who can't stand to be in the room with me,
either.
This 20 WPM Extra Class licensee will welcome the No Code Extras and do
my best to help them discover and
Hello Dave!
... Am I right in thinking that
the DSP board is the DSPx used in the DSP 10 2m
software defined radio?
The DSPx module used in the KDSP2 accessory may use the ADSP-2184N or
the ADSP-2185N DSP chip. The -2184 has less memory than the -2185, but
has more than enough for the
John,
Sometimes the speaker frame gets warped after shipping or some other
mechanical shock. The speaker magnet is very heavy, which helps
contribute to the efficiency of the speaker. If it is warped, you can
straighten it by hand. Both of my K2s had this problem initially, but
it was
Hello Ian!
I am trying to get back into CW and the filters are really odd. If I
bypass the DSP, everything works as I would expect. I can zero beat
using the spot button and the filters are fine. If I have the DSP in, I
cannot get the CW note down to the spot frequency and if I alter from
I'm feeling dumber than a rock here, but in following instructions on
alignment of filters using spectrogram I am trying to find how to turn
off AFIL (and/or SSB?) so that alignment is accurate... What is the
order in the menu for turning it/them off?
If you have no KAF2 or KDSP2, then it is
I just upgraded my K2 to 2.04/1.09 from 2.03/1.08 on the way to the CW
keying mod. The radio works fine, except for the new AFL+SPLIT shortcut
for the denoiser which results in the not inSt message...
AFIL+SPLIT is the autonotch, which works only in USB/LSB and is disabled
in CW and DATA
... One thing that is
certain, use a current type balun, the voltage type balun will not handle
reactive feedpoint impedances very well, where the current type
(particularly the 1:1 balun) will handle it much better (note that
everything is a compromise when multiband antennas are addressed).
Just assembling my K3 and perhaps I missed an assembly step because,
though I ordered the KXV3, KIO3 and KAT3, I hve no aux antenna port
below the two antenna connectors...what did I miss?
Not a thing. It is called RX ANT IN on the KXV3. The port you are
referring to is near the SO-239s and
So, this will allow me to transmit on a main antenna, and receive on a
beverage without a subreceiver or KXV3 installed, right?
Yes.
Lyle
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What harm would be done by allowing DTF in DATA A?
DTF is a special function for RTTY, and the K3 needs to know that thi
sis a RTTY application to set it up, enable the decoder, etc. The K3
needs to know the tone pair in use.
DATA A is a general purpose mode that is unaware of the type or
I just noticed that the picture of the K3 on the Elecraft website shows the
AF knob below the RF knob. In looking at my K3 I notice that the AF knob is
now on top of the RF knob. Anyone know why this was changed?
The front panel legends changed slightly as a result of feedback and and
I have a Tony Parks SoftRock v6.2 Lite for 30 meters. It's packaged for
use with the K3. The included crystal is 32.7680 MHz and the
divide-by-four frequency is 8.192 MHz. Combined with Jack's Z1
buffer amp with 70 dB of isolation, is the local oscillator isolated and
offset from the
I thought this reply was an authoritative answer:
http://www.nabble.com/Re%3A-KXV3-clarification-requested-p16058211.html
I believe Lyle Johnson is an Elecraft employee.
Yes, but he is fallible.
I just tried it out on my radio and thought that in split mode I could
have a different antenna
With trepidation I read the article in the latest QST - the same issue
in which the K3 review is published - Audio Frequency Enhancement. As
I feared, the secret is out. Just look at the top cover of your K3 and
read the article and you'll understand. (Not an ARRL member? Sorry, it
is
T. David Yarnes wrote:
Hmm! Has Larson E. Rapp been reincarnated in the body of Steven
G. Katz?
I think they are 3rd cousins, twice removed.
Lyle
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What is the bandwidth of the KFL-FM filter...
It is 13 kHz and the menu entry is corrected in the FM mode code were
currently testing.
73,
Lyle KK7P
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...If the equaliser users infinite impulse response filters,
it may actually exacerbate group delay problems (although it might also
cancel some of the group delay variation from the IF filters).
It does not. The Rx (and Tx) equalizers are entirely FIR-based.
73,
Lyle KK7P
OK, I accept what you are all saying about the gain, I was just
postulating :)
I agree it does drop off, but I didn't think that much.
Anyone tried it with CONFIG:AF GAIN set LO? I haven't, just wondered.
If there was a config control for an offset, it would need to be based
on the 4
I understand all what you are saying but how hard it would be to increase AF
gain when NR is engaged?
Mode-based NR gain compensation is one of the items on the list of
requests/suggestions.
73,
Lyle KK7P
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Of course, the very best thing you can do in that respect is move QTH
out to the middle of Kansas somewhere. :-)
Jericho, Kansas?
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I tried using VOX as the PTT for digital soundcard modes but that
doesn't seem to work...
A while back I used VOX in DATA A mode. Haven't tried it in a while,
but the intent is that it work.
73,
Lyle KK7P
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Fantastic - I've been wondering what was cuasing that - it's a problem
if your logger changes band, too it seems.
Lyle, could you comment please?
Not my area of expertise, I'm afraid.
Lyle
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As a newcomer to digital modes, one thing still puzzles me. Sometimes,
a station will come back to me several HZ above where I have called
him. I have to move to his frequency, by repositioning my arrow on his
waterfall trace so I can decode him. Then on successive overs we seem
to walk up
...I wouldn't have
expected to need the KXV3 module unless I actually wanted to use external
transverters to work bands above 6m.
Note that the KXV3 provides five BNC connectors.
Two (XVTR IN and XVTR OUT) are dedicated for transverter use, or other
applications for which you need a nominal 1
Haven't really had time to use my K3 on 50MHz, but when I tried it
the sensitivity seemed quite a bit down on my K2/KXV50
combination. Unfortunately I have sold the KXV50, so I can't do an
A/B comparison.
Is this what the preamp is meant to address ?
The 6m preamp, when available, is meant
Yes, wondering how that will affect connection of a XV144?
No impact.
The XV144 attaches to different BNC connectors on the KXV3. YOU can
have an XV144, XV22 and XV432 attached to the K3 and still connect (or
not connect) the 6m preamp as you desire.
73,
Lyle KK7P
I am wondering if the TX EQ only works in SSB mode or if it also effects the CW
tone as well. Does anyone have an answer to this? I would like to be able to
shape the CW tone a little.
Tx EQ only applies to modes where audio is used to create the final
transmission. So it applies to AM,
Great - But why only 6kHz
The example was using the 6 kHz AM filter.
and why can't one use the FM filter?
One can. My K3 is tuned to AM broadcast right now with more than 10 kHz
of IF and more than 5 kHz of AF bandwidth, using the FM filter and
MCU+DSP firmware that is currently in field
What deviation (bandwidth) is used for FM on 10 meters? Would
a 6 KHz filter work there or are the channels overlapping?
For Amateur FM operation, the K3 FM filter is required. Occupied
bandwidth of the usual signal is nearly 13 kHz, the width of the K3 FM
filter. Use of a 6 kHz filter
I want to use the K3 for RTTY and PSK 31
Which Iambic key is the easiest to learn to use? I currently work CW
with a straight key.
You aren't going to do RTTY or PSK31 with anyone's iambic key!
Sure he can. CW - RTTY and CW - PSK31 are already features on the K3,
and the VFO B display
What is the general average size of the passives on the K3 boards?
0805 and 0603 are the most common two sizes of passives used.
Are there any BGA components?
Not yet :-)
73,
Lyle KK7P
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Or do Rev A RF boards have a lower value for C222 than that shown on the
schematic?
Early production K3 RF boards have a 1 uF capacitor instead of a 0.1 uF
capacitor installed at C222. Yes, the published schematics show a 0.1
uF capacitor. The effect of the larger capacitor is to increase
...Worse, the latest handbook Figure 9.8 states that on-off
transitions of the RF envelope should follow a sine-wave curve, so I
don't quite know what to make of DSP-generated raised-cosine key
shaping.
Let me see if I can shed a glimmer of light here.
A sine wave, going from 0 to 360
A cosine is shifted by 90 degrees, starting at -1 for 0 degrees,
building to +1 at 180 degrees, and dropping again to -1 at 360 degrees.
The cosine of zero is +1 and the cosine of 180 degrees is -1.
Ah, I shoud've checked my math before I hit send. Yes, you are correct.
Lyle
The question I have is What is the effective shape factor of the K3
DSP?
DSP filters usually are so-called Finite Impulse Response (FIR). FIR
filters for a given complexity (length) have a nearly constant
transition region width going from the passband to the stopband. For
this reason,
Hello Rick!
The reference should be to the K3, not the KXV3. Recent firmware
provides the ALT tune you are looking for.
Tap ATU TUNE a second time within 5 seconds on the same band/antenna and
a more extensive search algorithm will be used.
73,
Lyle KK7P
I'm still working on my K2 but I wanted to make sure I knew that the
fixed audio output mod was required for use with the SignaLink USB
before I started drilling holes in my case. ;)
It is not required; it is a convenience. You can use the headphone jack
instead.
73,
Lyle KK7P
Can someone tell me what the bandwidth of the FM filter is?
13 kHz
73,
Lyle KK7P
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Anybody know just what the voltage range can be put out at the line out jack?
Since it is pre-AGC it isn't a constant level output but instead varies
with signal strength. CONFIG LIN OUT apparently adjusts the level.
It is in fact post-AGC. CONFIG LIN OUT adjusts the gain of the post-AGC
...The TX LED comes on when I push the PTT button, but no
RF out when speaking. I'm no doubt overlooking something quite simplistic,
but haven't found it yet...
Inject an audio signal from your soundcard or ? into the lINE IN and see
if you get Tx audio with MIC SEL set to LINE IN. The level
... If we
assume they've shipped 650 K3's @ $2,200 (I thought I'd err on the
lower-end of the range), they're received $14,300,000 in revenue.
I think that would be for 6,500 K3s, not 650!!!
73,
Lyle KK7P
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There is apparently some confusion about how the K3 ALC works. Just to
help muddy the waters a bit, I'll toss in what little I know about it.
We recommend setting the Mic (or LINE IN) Gain so you get 5 bars of ALC,
with possibly the 6th bar occasionally flickering, with CMP set to 0.
No,
Don,
This issue is fixed (or closer to being fixed ;-) in the DSP and MCU
firmware that is currently in fled test.
73,
Lyle KK7P
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1/
...(are the local oscillators fed from the same clock ?)
Yes, they are fed from the same clock.
2/The reference input port on the k3 has a blank in it and I cannot
see any information on installation of the external reference
connection ...
This is for a planned future option.
73,
Lyle
The suggested 4 Bar system does seem to work using SSB for the PSK.
Sorry for adding yet more confusion to the mix. I am running firmware
that is in field test and should be released next week. The statement I
made I believe to be true for the firmware I am running. I haven't gone
back
Is there any harm done using a mono to stereo adapter in the line out jack in
order to get the signal (no subreceiver installed) in both channels? This
will presumably short-circuit the right channel output on the jack. I am not
using any any of the pseudo-stereo modes.
I doubt anything will be
Pin #4(PTT IN) doesn't state it also has a 5V pull-up resistor. Does it so I
can use the same NPN type setup?
PTT has a pull up.
73,
Lyle KK7P
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Wayne, am I right in thinking the stiffener bar has been removed for
these shots, but is reinstalled once the KRX3 is in place?
Yes, and yes.
73,
Lyle KK7P
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My NUE-PSK Digital Modem arrived today...
If anyone sees a problem, or knows a better way, please let me know.
I suggest using the LINE IN and LINE OUT jacks on the K3. The NUE-PSK
modem has no isolation transformers in the audio, and if you are using a
wall wart or other non-battery supply,
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