Who says the bands are dead??
Those who listen but do not transmit.
:-)
73,
Lyle KK7P
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Hello Curt!
This K3 works well at home, but I am having some trouble using it at
the KH6LC station...
I don't know of any incorrect assembly step that might result in this.
I'm sending you a private email to see about some steps to take and to
try and help you solve this mystery.
73,
Hello Julian!
That's correct. It was done intentionally.
If so, fine. But why?
The PSK decoder's sweet spot is closer to 1010 Hz than it is to 1000 Hz.
Your next question is probably, Well, why not move the sweet spot?
The answer to that is quite lengthy. Trust me, doing so is not
I seem to remember reading something along the way about being able to
scroll back through the text decode buffers...
Possible future enhancement.
73,
Lyle KK7P
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I've bought a 400hz eight pole CW filter. Although the manual
recommends 1-2 db for a setting, I see that the adjustment can be
higher. What setting are most CW operator using?
You want to use the setting that most closely compensates for the
filter's loss. If you lack a means of
ERR TXF message - when transmitting on FM and AM modes...
You must use the 6.0 kHz roofing filter for AM transmit, and the 13.0
kHz roofing filter for FM transmit.
73,
Lyle KK7P
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Where have I gone wrong?
The K3 provides open collector outputs, so you may need to add some
pull-up resistors to the band outputs.
73,
Lyle KK7P
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Hello Roy!
Thank you for trying the new TX GATE feature.
However, when using the Noise Gate function, after quieting the back
ground noise, in between words I hear a crackling or static sound in the
headset. I haven't spoke with someone yet to know whether it is heard
on the air. I suppose
As a side-note; when I turn on SPKR+PH, the right-side of my phones
goes quiet - receive audio moves to left only. Is this normal/expected??
Yes, if SPKRS=1 which should be the case if you are using the internal
speaker. This forces mixing of all audio to the left (monophonic)
channel. The
Anyone else notice this problem.
1. The K3 is placed into the AM mode...
Thank you for this report, Craig.
We're looking into it.
73,
Lyle KK7P
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I guess I expected two antenna inputs to KRX3, and the ability to switch
between them at my pleasure. It seems to be an either/or situation.
Am I missing something?
You can select the same antenna as the main, or a second antenna. The
second antenna is either (a) the one not used by the main
Is there any problem using a VOM instead of a DMM to perform the
resistance checks while building the K3?
As long as the negative side of the internal battery that is feeding the
resistance measurement circuit is applied to the ground side of whatever
is being measured in the K3 during the
Hello James!
What would be the least expensive initial configuration for a new
(factory assembled) K3? My operating preference is SSB, but I may try
some of the digital modes at some point.
Either the basic 10W unit, or the basic 100W unit will get you on the
air. Just add an antenna, power
The change to 1 bar is something we discussed, but decided to not do it.
Adjust for 4 or 5 bars. If you see the hunting then either decrease MIC
gain until it goes away (probably at 2 or 3 bars) , or increase it slightly
until it goes away (probably at 5 bars). Increasing will activate the ALC
Hello Simon!
Programming all night is great fun, only wimps sleep.
WIMP - is this a subliminal indication that you're doing a port of
HRD/DM780 to RISC OS? My RISC PCs are anxious to do *something* in the
shack...
73,
Lyle KK7P
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Hello Bob!
Be sure you've downloaded the latest BETA firmware. Directions for this
are on the website. After downloading, be sure you see the correct
firmware revs in
CONFIG:FW REVS
Once you have confirmed the correct firmware is loaded, scroll to
CONFIG: TX GATE
and follow the
Is there driver support for the KUSB cable and if so, where can
I download them?
Please see the USB to Serial Adapter Troubleshooting topic in K3
Utility Help.
73,
Lyle KK7P
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I have the KRX3 installed and been playing around trying to get it at the
same gain level as the main RX.Can anyone share there settings.
Are you using the latest firmware? There was a gain imbalance issue
that was corrected in MCU 2.36/DSP 1.90 on the first of September.
73,
Lyle KK7P
Per the Owners Manual Version D, page 51, ESSB mode has it's own TX
equalizer, indicated by TX*EQ when setting the equalizer bands...
Not yet implemented. Currently, there is but one TxEQ across all modes
that use audio for Tx (SSB, ESSB, AM, FM, DATA A, DATA AFSK).
73,
Lyle KK7P
I did manage to get FL1 set to 400, but that was purely
by accident. Have been trying to get FL2 set to 2.70
all day and just can't seem to get it done.
The widest filter goes in FL1, the narrowest in FL5. It's OK to have
empties. It is not OK to have a wider filter (2.7) in a higher numbered
Not at present. I hope that this one is on the list.
Yes, set LINE OUT =PHONES.
73,
Lyle KK7P
Yes, I know it follows the headphone level, not a fixed level. Buit
you then record what you hear, a syou hear, set as you se tit, and Tx as
well as Rx.
MIC|LINE|DVR are summed, The result is sent to the VOX detector as well
as to the Tx Audio filter, which includes the TxEQ.
If the VOX detector were driven after the filtering, there would be
delay. This way, the filter delay acts to improve VOX attack time.
Tx EQ is a global control at
Compression is after the filtering. It is feed-forward.
VOX is before the filtering.
Tx EQ is inseparable from the rest of the Tx audio filtering/shaping.
73,
Lyle KK7P
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The band switch won't go above 30.000.00
You need to use BAND UP to go from 10 meter to 6 meter. You can't get
there by tuning a VFO.
73,
Lyle KK7P
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I had the same thought when ordering my K3, but I chose
the FM filter instead of the AM filter. That will give
me sufficient bandwidth for good quality AM RX as well
as FM TX/RX.
Absolutely. It is a shame that the K3 firmware currently
blocks ESSB or AM transmit when the FM filter is
Just getting my new K3 working on PSK31 and noticed that it seems to be
important to limit the range of the transmit frequency...
I just swept my K3 in DATA A mode.using the LINE IN jack for sourcing
the Tx audio. It is flat from below 200 Hz to higher than 2800 Hz
using a 2.,8 kHz IF
.
We'll put it on the list.
Thanks!
73,
Lyle KK7P
Steve N9SZ
Lyle Johnson wrote:
Just getting my new K3 working on PSK31 and noticed that it seems to be
important to limit the range of the transmit frequency...
I just swept my K3 in DATA A mode.using the LINE IN jack for sourcing
I'll be in Tucson October 21st through October 28th visiting family.
Please contact me off list if you'd like to get together. Maybe we can
arrange something...
73,
Lyle KK7P
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I've used it just fine in lab type measurements with a constant signal
source.
Which is precisely what it was designed for.
Is the reference value of AFV used in the dbV calculation the last one taken
at the instant one leaves the menu entry?
It is the last one. It might be the last one
The K3's dBV function is a *relative* measure. It must be set to
whatever reference you wish by first using AFV. The calculation
measurement is true RMS. It is used for measuring things like MDS, AGC
slope, roofing filter attenuation and so forth.
So what's the correct procedure for
The K3's dBV function is a *relative* measure. It must be set to
whatever reference you wish by first using AFV. The calculation
measurement is true RMS. It is used for measuring things like MDS, AGC
slope, roofing filter attenuation and so forth.
This function has been in the K3 for a
Maybe dBv stands for dB variable, not dB with respect to a volt.
Not with respect one volt, but voltage based, using the 20log rather
than the power-based 10log conversion.
AFV is AF Voltage and corresponds to the voltage you would measure
across the speaker with AF GAIN set to max. Units
If you reference to a full scale meter reading or A/D converter clipping
level, a standard that is in use is dBFS (or dBfs).
We have a total of three characters available, and we wanted to express
that this was a dB value, and it was voltage based. So we used dBV.
73,
Lyle KK7P
Brett Howard wrote:
What about CW ops who'd wanna use the squelch?
The NR can be used for this sort of thing until a level-based or
content-based squelch is available. This is not a commitment for such
squelch functions!
73,
Lyle KK7P
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OK, I looked at the firmware chip that I received just today, and it is
level 2.04R instead of 2.04P.
I do not have confirmation, but from Larry's report, it may be that the
sidetone source is now fixed at U8-4...
That is exactly the difference, and the only difference, between 2.04P
and
In fact, just pressing SPLIT should get you to the same condition as two
A-B taps and pressing SPLIT.
While cross-mode QSOs are not as common on HF as they are on 6 meters,
such an implementation would make them extremely difficult.
The K3 is a complex radio and has its own personality.
alsopb wrote:
The sub-rx document says your loose 3db of signal in the main rx when
switching in the sub rx when sharing the main antenna.
For really weak ones, you'll probably want to have the sub-rx off unless you
have a separate antenna for the sub-rx.
The signal (including received
Considering this, the K3 plus XV144 while probably the best combination I
have ever come across on receive is not ready for use on transmit just yet
because of the ALC issue if you use a sensitive amplifier.
Next time you set this up and *after* you have the drive set, set
CONFIG:TX ALC to
I'm in the process of implementing the K3 external ALC mod. It is not clear
to me, between the picture and instructions supplied with the mod kit, what
is going on at the junction of the 69.8K, the 100K and the 137K resistors.
They converge on pin 9 of the connector, and are soldered to it.
Lyle Johnson wrote:
I'm in the process of implementing the K3 external ALC mod. It is not
clear
to me, between the picture and instructions supplied with the mod kit,
what
is going on at the junction of the 69.8K, the 100K and the 137K
resistors.
They converge on pin 9 of the connector
there is a shift and as a mater of fact that occurs at the
same time as there is a drop out when using the shift control
as you roll through one filter than another. Can anyone shed
some light on this?
Yes, the correct BFO injection shifts depending on the width and center
frequency of the
Anyone using the combination of the SDR-IQ receiver and the K3 together?
Wonder how it and the specraview software works as a band scope?
I've used SpectraVue with my SDR-14 and K3. It works quite well. THe
interface is different than LP-PAN, and I have not attempted to use
LP-Bridge with
Tom Wylie wrote:
Is it possible to get noise reduction working when in Data mode like RTTY?
No, this is intentionally restricted.
Using noise reduction on a data signal can introduce distortion to the
signal. The demodulator,if properly designed, will be matched to the
expected signal
...I believe the device listed as U29 on the K3 schematic may be a
mis-print and my best guess is that's it's the Texas Instruments TLV320AIC23
-- as is the case with U7.
The schematic is correct, U29 is a TLV320DAC23.
73,
Lyle KK7P
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Paul Christensen wrote:
Hmmmmy schematic shows TLV320ACC23 for U29.
I see that, too. The D is missing.
Lyle
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is there any possibility to grab a digital audio out signal (e.g. a PCM
stream) out of the K3 ?
Sorry, no. There is no path from the existing connectors to the DSP for
such a stream, and we'd also have to deal with the correct framing for
AES/EBU, etc. And then we'd have to deal with
I just wound my first toroid for the K2. It is supposed to be RFC14,
18microhenries, 10 turns. I measured the inductance with my LC Meter IIB
and it measures 31 microhenries. Is this okay?...
Use the number of turns as your guide. Measured inductance may vary
depending on the frequency you
Is anybody at Elecraft AT PRESENT working on bringing the notch
upstream as if it were notching in IF (like in a analog rx) ?
Sorry, no. Some other tasks are higher priority right now.
73,
Lyle KK7P
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Is anyone else experiencing distortion when using the monitor facility on
SSB ?
Yes, it is a DSP code issue and is on the list for correction.
73,
Lyle KK7P
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There are three distinct audio channels in the K3, and they all have
slightly different characteristics.
LINE OUT
This has its own digital-to-analog converter (DAC) and is transformer
isolated.
PHONES
This shares a DAC with the speaker channel, but has its own amplifier
and isolating
We've had a number of support requests regarding KRX3s with no audio.
PLEASE be sure that you have *CONFIG:SPKRS 1* set on your K3 when you
attempt to bring up the KRX3 for the first time. You may have set
CONFIG:SPKRS to *2* for use with your stereo headphones, especially if
you have
There are three distinct stereo audio channels in the K3, and they all
have slightly different characteristics.
LINE OUT
This has its own digital-to-analog converter (DAC) and is transformer
isolated.
PHONES
This shares a DAC with the speaker channel, but has its own amplifier
and
So I hope the audio mixer will mix both left and Right for main and sub
and allow us to use CONFIG:SPKRS=2 and CONFIG SPKR+PH=YES again.
It does.
Lyle KK7P
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only to be sure - if I have in CONFIG: LINE OUT - PHONES which D/A is
used - this one for SP/PHONES ?
LINE OUT is always driven by the LINE OUT DAC.
73,
Lyle KK7P
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The 'mono' label is tricky. I think it means that the mic. audio is mono
but not the jack.
Correct. The jack is physically a stereo jack, but the audio path is
MONO (tip) only.
73,
Lyle KK7P
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The mic plug on my Heil K2 proset is mono. And it work just fine.
My cheap radio shack computer headset works just fine, too.
The ring terminal on the jack is not connected, so you can safely use
a MONO (i.e., single channel) or a STEREO (dual channel) connector, as
long as it is the correct
Using the manual notch to dip a unwanted signal works great.
I would expect that the AGC would react to this notching by increasing
the gain of the rx again. It seems that this is not so.
At present, the NOTCH filter, whether automatic or manual, is after the
AGC loop.
73,
Lyle KK7P
Hello Bob!
I'm sure Elecraft will have a Noise Gate built into a K3's firmware some day,
but a noise gate is a valuable tool
An experimental Downward Expander will be available in the K3 firmware
in the near future. It has been undergoing some limited testing already :-)
73,
Lyle KK7P
Hello Arie!
Any plans of moving the notch upstream as if it were notching in IF
(like in a analog rx) ?
Key phrase is at present :-)
73,
Lyle KK7P
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I'm sure Elecraft will have a Noise Gate built into a K3's firmware
some day, but a noise gate is a valuable tool
An experimental Downward Expander will be available in the K3 firmware
in the near future. It has been undergoing some limited testing already
:-)
Further to this, I find using
...14 W in standby with AF volume at normal
level, with all my options, seems a bit low. I would rather expect something
in the range of 50 to 100W.
The heritage of the K3 is portable operation, so we worked pretty hard
at keeping the current drain low without sacrificing performance.
Maybe
I have the latest firmware installed, and am learning the various controls.
It appears to work as advertised, with one exception. I have a distinctly
lower volume level coming from the KRX3. When using headphones, and the KRX3
listening on the main antenna, I have to set the sub volume about
Paul Kirley wrote:
When I tried setting K3 CONFIG:SMTR MD to ABS, I found that the S-meter reading
then stayed constant regardless of the setting of the preamp/attenuator, in
agreement with the Owner's Manual addendum.
However, the reading for a 50-microvolt input signal (with the preamp on
On AM the 2.7 Khz filter looks like a narrow cw filter using AM. I went
back to version 2.23 and the 13, 6 and 2.7 Khz filters look and sound ok.
Anyone else notice this?
Thank you for your observations. We have confirmed this problem. It is
on the list of things to look into.
In the
...why does it always say N/A against DSP2 in K3
Utility when it also indicates that for example 01.89 is available ?
N/A means that the required hardware (in this case the Aux DSP board) is
not installed in the K3, so attempting to program it is N/A (not
applicable).
More accurately, it
I've finally put the second RX in my K3 #22.
I have 2.7k filters with -0.86 and -0.87 offsets- have I ended up with
filters that are matched enough for diversity reception?
Yes, but set them both to the same value. A 10 Hz error is not going
matter to the 2.7 kHz filter's passband response,
... wonder if anyone on the
reflector has looked into what will be necessary to install the DVR when it
finally arrives...
The DVR is a small PCB that attaches to the Main DSP, just below the Aux
DSP.
73,
Lyle KK7P
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I use a PR40 with my K3/100. I have to set the mike gain to maximum (60)
in order to get the correct ALC readings and power output. Is this
normal or am I missing something in the menu structure?
For a dynamic mic, be sure BIAS is OFF. You may need to set MIC H|L to H.
73,
Lyle KK7P
...After exiting test mode (TX arrow
not blinking), I was able to make a good QSO to S. Carolina (5/7) BUT my
own TX is coming out of my speaker just like when in test mode!
TEST mode simply ensures no RF goes out.
The transmit audio level is controlled by MON. It is independent of TEST.
I set a power, any power it does not matter. I key the key to produce a tone
output and see a spike at least 20% above the set power level, but only for
the first transmission. After that the power drops back and stays correct
until I change the power. Then the process repeats.
We're working
Elecraft is well aware of N8LP's mod, Wayne saw no problems with it at first
glance and is now considering whether to make it a production mod. Both
N8LP and K8ZOA seem to feel it is not damaging the radio, etc.
Remember to make the measurements Jack points out on his web page if you
do the
...I'm wondering for diversity reception how big a deal is it
that they be matched? My 500Hz filters have -.80 and -.77 offsets,
while the 2.7Ks have -.84 and -.90
For Diversity, you want the offsets to be the same.
I suggest you split the difference and try using a -0.78 or -0.79 offset
I have never attempted as delicate a procedure as this. I am soliciting
suggestions on how to do this without damaging the rf board.
I always use two (2) small temp-controlled soldering irons (Hakko 936).
The idea is to heat both ends simultaneously to melt the solder
without dwelling too
Set the PWR control to 100w (or 120w if you wish) and control the power
output using the MIC level control on the front panel. (MIC SEL = LINE IN).
Or is that classed as cheating? :-)
Yes, I think it is :-)
The problem with this approach is that over time the slow ALC loop may
try to build
I just started noticing that I get a quick message of ERR PL 1 when I
change bands...
Is this normal?
No. Try re-running VCO Cal. If that doesn't fix it, please contact
k3support.
73,
Lyle KK7P
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Three from Inrad (1.8, 1, and .4) did not have a sticker with offset on them.
The 8-pole filters have no offset, please use 0.0.
73,
Lyle kK7P
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Hello Joel!
I noticed a lack of balance between the two channels while using AFX. At
first I thought it was a speaker problem, but after swapping everything
from side to side without change, I noticed that it was nicely balanced if I
turned AFX off.
Is this with voice or CW?
Since AFX
I get the ERR TXF error message.
Be sure CONFIG:FIL TX is set to FL3 in CW and SSB modes since that is
the slot in which you have installed your 2.8 kHz filter.
73,
Lyle KK7P
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I'm not able to force CONFIG:VFO IND to yes...
This feature is not yet implemented, please check the release notes and
errata.
73,
Lyle KK7P
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...The cable from
LINE OUT jack of the K3 to headset input of laptop...
The LINE OUT of the K3 goes to LINE IN on the computer (or mic in).
LINE OUT (or headphone out) of the ocmputer goes to LINE IN on the K3.
73,
Lyle KK7P
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...On FM and AM when I trigger the VOX I get the ERR TXF message.
I have a K3 with 12, 2.7, 500, 200 filters beginning at slot 1.
The FM filter in slot 1 must be set to 13.0.
I am uncertain if AM Tx is supported with any filter other than 6 kHz at
the moment.
73,
Lyle kK7P
I think that there was a QST article some years ago regarding an audio
filter/equaliser tailored to match one's hearing loss profile. The
author claimed that it enabled him to hear his radio much more clearly.
This is part of the reason for the 8-band equalizer in the K3 receiver.
YOu can
BACKGROUND
There has been a lot of confusion about AGC in the K3. Some of it is
AGC related, some of it is AGC interaction with noise reduction (NR).
A later email will address the noise reduction issue. For now, let';s
look at the AGC apart from NR.
---
WHY DID THE AGC CHANGE?
WHen we
Thanks for the explanation. As you say, noise levels differ between bands and
over time E.g. 80m in Summer compared to Winter or HF versus 50MHz and
higher bands via a transverter. Does the AGC setting apply per band or does
it cover all bands?
AGC is AGC. It is not per band, it is per radio
Does the second receiver mute when you transmit on the K3?
Yes.
73,
Lyle KK7P
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Subscriber Info (Addr. Change, sub, unsub etc.):
On 10 Mhz, it seems that the Sub Rcvr is Linked to the Main Rcvr and I
can't seem to find any instructions on the Link command.
Hold SUB to toggle LINK/UNLINK
73,
Lyle KK7P
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...Is there any
indication as far as you know that the filters may be a part
of the 10 meter SSB output power problem?
The problem I have been aware of is the LSB/USB power output difference.
That seemed to be confined to 2.7 kHz filters, was related to the
center frequency offset, and
If you experience this problem (low output on SSB), please check if the other
sideband works OK, and note if you are using the 2.7 kHz 5-pole filter or the
8-pole 2.8 kHz filter.
Finally, please try the latest beta firmware.
73,
Lyle KK7P/7
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Is the ESSB enhancement coming today? Thought I read that somewhere.
It is being tested by several stations.
73,
Lyle KK7P (in Anchorage AK for the ARRL 2008 Alaska Hamfest)
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...There is just no tracking of levels at the I F
out with what is fed into the antenna input of the receiver.
If that were true, LP-PAN, SDR-14 and SDR0IQ could not be used as
panadaptors. But they can and are being used, so one can only conclude
that the output at the IF jack most
K3 Anybody heard anything on the status of KDVR3?
It is actively being worked on.
73,
Lyle KK7P
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The 2nd antenna input works as expected but my oscilloscope shows no
signal (5 mV) coming from the IF Output on the KXV3. What IF signal
level should I be seeing?
It will be about the same level as at the antenna, or perhaps less,
depending on settings of PRE, ATT, etc.
73,
Lyle KK7P
I am trying (and failing miserably) to set up my K3 to work PSK31 mode.
PSK D is only for use with the internal CW-to-PSK feature. If you are
using a soundcard program, use DATA A.
73,
Lyle KK7P
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I'm still showing 2.19 at the beta site. What am I doing wrong?
Refreshing your browser will usually fix this. You might have to not be
using the web site in frames mode to make this work (select no frames
from the box on the left).
73,
Lyle KK7P
...Reading the manual
it appears that you can have audio input from ONLY the front panel, rear
panel, OR line in. The wave files were coming via the line in and the
mike via the Front panel. Did I over look something?
You can have either mic plus LINE input active at the same time. See
I just discovered that I can no longer adjust my CW sidetone level.
Sideotne amplitude is set by MON in CW mode. LEVEL is part of the Noise
Blanker.
73,
Lyle KK7P
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I've tried using the dual PB capability of the K3 on RTTY but can never
seem to get a RTTY signal through it to be able to decode (I am using
MMTTY). No problem without using the DPB filters. So if someone has the time
might you walk me through the settings you use for the K3 and RTTY? Roofing
...The PTCIIex, for example, expects USB so you have
to issue TONES 3
Oops, TONES 4. But in any event, consult the documentation of the
device you are using.
73,
Lyle KK7P
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You must be
I've been doing some reading on the new firmware. I would like someone to
explain (like I am a 3rd Grader) the different between IIR Filtering and FIR
Filtering. Thanks.
Essentially, IIR filters have feedback, so they can ring and in extreme
cases oscillate. Think of an op-amp based audio
Is there a menu setting to allow my K3 to transmit CW while in the SSB
USB mode on 6M??
Yes, please see the firmware release notes. You can view these
directly, or from K3 Utility's HELP menu.
73,
Lyle KK7P
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