The K3 implements IF Envelope clipping for SSB. The controls and LCD are
labeled compression.
Note that with other modes, like AM or FM, RF envelope clipping is not the
correct method to increase talk power. Compression is a more general term,
and the LCD and controls are labeled accordingly
One of the problem with the Wiki is that anyone can post to it and anyone
can change the posts of others...
Not necessarily. The HPSDR wiki and AMSAT's Eaglepedia are two examples of
ham-related wikis lwhich imit access for posting/editing, but provide
unlimited access for viewing.
73,
Lyl
Hello Joe!
Unlike most DSP-based radios, the K3 converts from the main IF (8.215
MHz) to the 15 kHz DSP IF without an intervening 455 kHz IF. This helps
give the K3 a cleaner sound and better dynamic range since there are
fewer conversions.
However, this also means the IF crystal filter mus
In FM mode, capture effect helps suppress the effect of "image"
leakage. AM and (E)SSB modes have far more dynamic range and the
15 kHz IF image must be suppressed by some 10s of dB more than is
required for excellent FM operation.
Are you speaking of receive performance or transmit performan
...Alternately, can a coupling
capacitor be used across the filter slots to just use DSP for AM BC?
No, a roofing filter is required. Please see my remarks the other day
about IF image response.
73,
Lyle KK7P
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As far as I know there is no sound card software to transmit Pactor I.
HFTerm (for linux) < URL:http://sourceforge.net/projects/hfterm > does
Pactor I Tx and Rx.
In it's wisdom SCS has kept that proprietary and patented, along with P
II and P III. You get to buy their $1K modem if you want
How would you get to 13cms / 23cms with the K3?
For L-band uplink, Down East Microwave
http://www.downeastmicrowave.com > has several options available,
including some recent products that work directly from a 28 MHz IF.
They also offer S-band transverters with a 2m IF.
DB6NT-designed trans
Maybe wait for future K3 VHF/UHF modules?
Perhaps a KM1 weak signals oriented (CW, SSB) DSP based VHF to
microwave transceiver? Maybe vaguely similar to Bob W7PUA's DSP-10 2m
SDR/DSP transceiver. :-)
One of the problems with gear for 900 MHz and higher is that you really
want the RF deck mounte
Believe I read that the DSP will make up for any loss caused by the 8
pole CW filter.
When installing a crystal roofing filter in the K3, you enter a gain
compensation amount in dB. The compensation is done by the DSP when
that filter is in use.
73,
Lyle KK7P
_
Did any of you see the ARRL bulletin about Motorola buying Vertex?
Saw it elsewhere earlier today. Motorola isn't a company interested in
niche markets like Amateur Radio. It'll be interesting to see if the
Yaesu brand survives, is auctioned off, or...
73,
Lyle KK7P
_
Hello Fred!
> Gary says that 1N5711's give more accurate readings than
> lessor diodes such as the 1N4148... question; how much more
> accurate, and how critical is this accuracy? Would the
> 1N4148 be more, less, or the same susceptability to ESD?
The 1N5711 is a Shottky barrier diode; the
Yes, they share the same parameters.
Thank you for explaining that. Is that because the DSP can't find out
the mode? So you can optimize the DSP for CW or SSB? Or am I confused?
You are not confused -- at least not on this point :-)
The denoiser is common to both the CW and SSB audio path
...When I turn the denoiser on in CW mode, the waterfall shows
nulls every ~100Hz or so, and 600Hz falls right near one of those. The
CW note sounds ragged when it gets near one and I need to RIT slightly
to get it out of it.
Are these nulls expected?
The denoiser is a series of filters so
And you're sure it's not because no one makes a CF
lamp small enough to fit inside a KX1?? 8-)
I think everyone is missing the two essential points.
1) The KX1 is actually a transceiver built into a logbook night light, and
2) If Mercury is put into a CF lamp which then fails, it is no longe
I assume the microphone connector can be configured to suit different
microphones, just like the K2...
The K3 has fixed wiring rather than a jumper block. It matches the
wiring of the MH2, Elecraft's electrically and aesthetically compatible
microphone.
The pinout of the K3 microphone is co
If I understand correctly, since I did not put the resistor on the mic,
and when I get a K3, I will be able to use this mic on the K3...
That is correct. The unmodified MH2, old or new, plugs into the K3
front panel mic jack and works.
73,
Lyle KK7P
Keith, how ever could you be so well connected to live
in kangaroo country and still beat my order date by so
much? This is quite troubling. ;-)
Because Oz is nearly a day ahead of us, so by the time we heard the
announcement, it was yesterday's news Down Under.
73,
Lyle KK7P
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I am trying to find a fault in my KDSP2. Do circuit diagrams of the two
boards exist with higher resolution of the logic signals?
Please go the Elecraft website, click on products, click on K2, click on
KDSP2, scroll to the bottom of the page and you will find links to high
resolution schema
Is there any numeric indication of the K3 rx bandwidth on the display?
When you change the bandwidth, the current width is briefly displayed in
the VFO B display.
73,
Lyle KK7P
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Can I use all 5 available roofing filter slots and also have the
KBPF3 General Coverage Rx filter module installed without losing
any of the slots for the roofing filters?
Yes. The KBPF3 is an array of pre-mixer bandpass filters rather than a
post-mixer roofing filter, so it does not count as
But that leads to a question that may have been answered already- Is
the audio input hard selected, as it appears, or can multiple inputs
be used, depending on where PTT is asserted?
There is one PTT line inside the radio. Thus, the K3 has no way of
knowing if you pressed a PTT button on your
Hello Barry!
One issue here is that the K3 only allows a single audio source. Some
other radios (e.g., Orion) allow you to enable both the rear line-in
jack and the front panel mic jack.
We have an active discussion going on with the FT group about this very
topic.
The K3 hardware can allo
Hello Leigh!
... But as
it is, you have to remember to change the MIC SEL setting and readjust
the MIC GAIN when you switch from SSB to PSK.
The LINE IN Gain and MIC Gain are separately maintained values, even
though they use the same control, so when you switch from MIC to LINE
the last-u
What was the rationale behind a cutting edge (2007-08) product such as the
Elecraft K3 being supplied with a RS232 interface in stead of a USB port?
There were several considerations:
1) Many of our customers have older computers with RS232 ports and not
USB ports.
2) USB -> RS232 adapters a
I use NR = 6 (firmware 1.41), but I think it depends on the noise you
are trying to reduce. It doesn't seem to change when adjusted until I
reach the higher numbers.
The response at the lower settings isn't instant. Set, pause, listen,
set, pause listen... At the higher values the attack tim
I think I have found a supplier for a 32.800 Mhz crystal, which would
put the softrock at around 8200 and make it a more reasonable 15000hz
offset. I hope that this will still be far enough away from the 8215 IF
to not cause any problems, while making the bandpass a little more
symmetric.
Be
I don't know what I am going to do about digital modes yet.
1) Use a keyer paddle and the VFO B display. This will give you CW,
RTTY and soon PSK31. PSK31 is presently receive only, but that will
change soon :-)
2) The K3 includes an isolated soundcard interface. All you need is a
pair o
Especially the dependencies between the MCU and DSP versions is
not clear. Maybe Elecraft can give us some information ... ?
When we release new versions of K3 MCU or DSP firmware, if there is a
corresponding update needed in the DSP or MCU, we will issue an update
to that file at the same tim
I have a Heil GM-4/5 "Goldline" desk mic and I have
an uneasy feeling that it doesn't have enough output
to adequately drive the K3.
Is anyone using this mic with a K3
I have a Goldline that I use with my K3.
that can confirm my suspicion?
I cannot confirm your suspicion, however, since my
If one purchases two receivers in one K3, can one 'split' dual-receive
(one freq in left ear and the other in right ear)
Yes, you can separate the audio streams, one receiver per ear, or you
can combine the audio streams, for example to hear both receivers from
the internal speaker.
73,
Lyl
Does anyone know the impedance range of the external speakers for the K3?
4 ohms to 16 ohms ought to work fine. 4 ohms will give you the loudest
audio since the amplifier is having to work directly from the 12V supply.
73,
Lyle KK7P
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... But one that can do
digimodes without a sound card would be unique to Elecraft, I think.
I could use it with my Acorn A4 laptop or my RISC PC, assuming you write
this in BBC BASIC!
73,
Lyle KK7P
PS - Note that BBC BASIC http://www.bbcbasic.co.uk/bbcbasic.html >
is a multiplatform/mult
Hello Joe!
Please be assured that we appreciate your thoughtful and constructive
comments on the K3.
73,
Lyle KK7P
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That's useful information. If the K3 band select lines can tolerate
12V pullups,
They can.
73,
Lyle KK7P
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I understand that the narrow (focus) filter is a fixed bandwidth and that the
wider (context) filter bandwidth can be varied.
What is the width of the focus filter?
Currently it is 150 Hz.
Do the roofing filters simply track the context filter bandwidth as it is
narrowed?
Yes. Co
On the order page I see a DVR for the K3.
I've also seen references to a DVK, but it
must still be in development. Or are they
the same thing?
If not, what is the difference between the
DVR option and DVK?
Some people and apparently some PCC apps use the acronym DVK.
The Elecraft product for
I don't have the KDVR3 digital voice recorder option so I don't know how
hard that is to install.
Installation will require removal of the front panel assembly in such a
way as to allow removal of the DSP board. The KDVR3 attaches to the DSP
board.
The KRX3 option also requires attaching a
K3 #98 is working well. Has anyone found the right settings of Mic Gain
(Hi/Lo?), Comp, VOX Gain, and VOX delay for the Heil HC4 element?
Trying to get on the air for the 10M contest...
Depends on your voice and preferences. Listen to the MON in your
headphones while you mess with MIC and C
...he advantage of this is when you use DUAL PB. That function sets
the narrow passband to 150 Hz and the wider passband to 600 Hz.
The wider passband is 600 Hz at its narrowest setting, YOU can make it
much wider just by rotating the WIDTH control once you are in DUAL PB mode.
73,
Lyle KK
* Noise reduction much improved, including insertion loss compensation.
Can you offer a little more information about the NR? In this version
of NR, the set levels are in four groups of four, whereas previous
versions have been 0 to 39 or 0 to 3. Additionally, I noticed that the
NR does not
...the noise
reduction doesn't seem to be working as well as before. Has anyone else
noticed this?
Yes.
The filed test group is currently testing a new code release that
addresses this, and adds... oops, I shouldn't say that yet!
73,
Lyle KK7P
_
I haven't gotten my K3 yet, so haven't tried to updatebut it appears
the download page doesn't say what's new/deleted in a firmware version.
Is that information part of the upgrade? In another File?
With each firmware release there is a notes file that is fetched and
displayed by the K3 U
Thanks...I found the download pageand I think that the same
information is contained in the RTF files?
It *is* the info in one of the RTF files.
Lyle
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Hello Peter!
During the lowpower wattmeter calibration we appear to have no TX output.
Test indicate no RX either.
Please direct K3 support questions to "[EMAIL PROTECTED]" rather
than the reflector.
Sounds like you may not have the filter enabled, or perhaps one of the
cables between th
Is synchronous detection is enabled?
Not yet.
73,
Lyle KK7P
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They seem to be fine tuning the noise reduction, but are not worried about
the modes
We added AM to the latest release.
73,
Lyle KK7P
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It's been suggested in the past here that AM mode for
K3 transmit would be functional in the firmware using
the KFL3B-FM FM b/w, 8-pole roofing filter leaving
the operator responsible for proper setup if they
don't have the 5khz filter.
Is that the way it's coded? ;-)
Currently, the available
Under AM mode, the DSP bandwidth control seems restricted to 6KHz. Is
there any way that I can change it to 6KHz to match the AM crystal
roofing filter?
With the 6 kHz roofing filter, you should be able to set HI CUT to 3 kHz
in AM mode. My radio is not immediately at hand at the moment to v
Yes, I can set the HI CUT to 3Khz. Can it be increased to 6KHz to
match the AM roofing filter?
Not in AM mode. In AM there are two sidebands, so an audio frequency of
3 kHz results in upper and lower sidebands, thus requiring a 6 kHz filter.
In SSB mode, you can set HI CUT to a much higher
When I transmitted PSK31 on a K2, I increased the audio until the ALC just
flickered. The K3 Manual suggests that the mic gain is advanced until 4-7
bars show on the ALC. I thought compression and ALC had to be zero to avoid
excessive bandwidth and distortion? Has the K3 got something the K2 hasn'
I have to second this. The K3 DSP is what DSP should be...
Lyle has out-done himself on this!
Thank you for the kind words, but this really is a team effort at all
levels.
Merry Christmas!
Lyle
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Can someone enlighten me about setting up the NR parametershope I can
explain myself ok!
The NR has changed with time and may continue to do so. As a result,
the manual is general in its treatment. The overall rule is "more is more."
NR is more properly Signal Enhancement rather than No
... what benefit would it be to get
the KBPF3 General Coverage RX Filter Module? ... will this impact the
performance while in the ham bands?
The KBPF3 is switched into the signal path instead of the ham-band
bandpass filters when you tune the K3 outside the ham bands. When you
are tuned i
Any one have any experience with the softrock and the K3...
PLEASE remember that you *must* have a high-reverse isolation buffer
between the K3 IF OUT jack and the Softrock antenna input. The Softrock
may have a huge spur at its carrier frequency and its mixer may not
suppress this adequatel
Any recommendations for a "high-reverse isolation buffer" circuit?
No.
I just want people to be aware that the I.F OUT jack is exactly that:
and I.F. *OUT* jack. All bets are off if you inject a signal into this
connector.
Keep in mind that the Softrock is a $12-class receiver, not a $500
Thanks Ed but, yes I do have the latest firmware. And the MIC SEL had been
changed several times between rP.H (for SSB) and Line In (for AFSK). Again,
the Line In selection works if I transmit AFSK in LSB mode. But no
modulation when in DATA mode.
I just ran some tests here. The K3 data mode
The outer PB is tipped, that is, the high frequency side of
the inner filter is five to ten DB stronger than the low side.
Seems like it ought to be in balance.
I think if you plot the response at whatever width you have set, you'll
see the low frequency rolloff before you engage Dual PB. Thi
While working on DSP code for you know what, I currently have my K3
connected to the shack desktop computer using just a pair of 3.5mm
(1/8") stereo patch cables. The various radio <-> computer interfaces I
purchased for my other rigs are gathering dust, along with the rigs.
The K3's internal,
Is it the missing hardware or are others experiencing noisy fans, too?
All comments to date have been about how quiet the fans are.
Are you hearing: bearing noise from a defective fan; buzzing or rattling
from a fan not firmly attached to the panel and perhaps vibrating; the
panel not firmly
I had a chance to see a DZ kit Sienna at Pacificon in October. It was
powered up and operating -- and it is a kit! I can't comment on
performance or design, as I neither operated it nor examined its
specifications.
I am encouraged to see that there is sufficient belief in the future of
Amat
Hello Tom!
p.s. Lyle, about that DSP. I had a friend over, and while I don't have
an antenna to transmit on 160, he was listening there, and the line
noise here is S6. You could here some people talking buried under the
noise. I tapped the NR button, and they jumped out. My buddy sat there
an
...Would some of the current K3 owners
please let me know how long before their radio display settles down and the
radio is fully operational?
About 3 seconds to come on and about 1 second to shut down.
73,
Lyle KK7P
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Hello Rick!
My question would be, are there two separate IF outputs on the K3 if you
have two receivers installed?
There are two IFs, and independent 8.215 MHz IF buffers. The KXV3 only
allows a single IF to be connected at the moment, so you'd need to
hijack or add a rear panel BNC to have
Would some of you current K3 owners please check and see if you can hear
anything between 500-700 khz. Also, do you have the KBPF3 installed and use
the AM filter?
Works fine here and I can easily listen to AM BC stations in this range.
Have a Gr8 '08!
Lyle KK7P
___
For the values displayed when I twidle the Mi8c and CMp pots - what do the
numbers represent - % of compression? DB of mic gain?
Assuming you are referring to a K3, these are dimensionless values.
More is more ;-)
MIC GAIN is set by looking at the ALC meter. The bars there are also
dimension
Any opinions out there about pros or cons of these two tuners? If one were
going to build a KX1 from the ground up, would either of these tuners be
preferable to the other in general?? Why???
KXAT-1 is smaller, fits in the KX1 and is integrated with it
operationally. The T1 is larger, e
If a really low power DSP could be made for the K1 and/or KX1 - say, one
that consumes 10 to 15 mA from a nominal 6V supply, less from a higher
voltage - which features would you be seeking?
Selectable bandpass filters? Auonotch? Denoiser?
Which would you be wiling to give up?
No, there is
If you switch the DSP by tapping "7" while in the filter menu and have
50 or 100 Hz bandwidth there is quite a change in volume, however if you
select the new default setting and rotate the width control all the
settings are the same volume. What seems to happen is that now the
50/100 Hz bandwi
I wonder if there is a list available of the K3 features that are NOT
yet activated in the current firmware.
Check the errata sheet that came with the radio. As features are added,
they'll be listed in the firmware updates, viewable through the K3 Utility.
...I am unable to enable synchrono
...I'm wondering if we'll be able to have more bandwidth on
AM when we use a 12 KHz or similar roofing filter.
I expect this will be the case.
73,
Lyle KK7P
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...I want to
use the SDR1000 as a panadapter connected to the K3 IF out...
Can the K3 withstand ½ watt on these connections without harm should I
accidentally put the SDR1000 into transmit?
DO NOT transmit into the Rx IF out connector!
The SDR1 can output 1W P.E.P. (+30 dBm). That will
I was going to use VOX instead of a physical PTT, but that doesn't work
well. I've adjusted gains but it insists on cycling on & off. Thought
anti-VOX would fix, but it doesn't.
Please check your cable and verify it is firmly seated into the K3 LINE
IN connector. I routinely use LINE IN with
If I have nothing plugged into the external speaker, and just want to
toggle between headphones and internal speaker, what does the internal
speaker do when spkrs=2? That is my situation.
The internal speaker is wired to the Left channel. Operationally, it
just means that you won't hear the
In fact, I think it stays in all the time with this setting.
Set CONFIG:SPKRS = 2 and then it won't drop out
Here is what is happening.
If the DSP believes there is a monophonic listening channel in use
(SPKRS = 1, as in using the internal speaker and headphones not plugged
in) then all audi
My question is: Has this feature been implemented yet,
No, it is on the The List.
73,
Lyle KK7P
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I can send you some shots from my oscilloscope. With either the 2.7 kHz
or 2.8 kHz SSB filter (I tested both), in SSB mode, from release of PTT
I measure ~22 ms to audio. There is a possible spike or other amplitude
perturbation at about 38 ms and lasts for about 2 ms, then things are
steady f
Are ssb tx passband adjustments in the K3 limited to TX EQ? If so, is there
a spec on what the tx audio passband is adjusted to at the factory with the
stock 2.7Khz filter?
The default Tx Audio passband is 250 Hz to 3150 Hz. Its adjustment is
not yet part of the user interface, but will be.
...can not get anyone to read my psk signal when i use the paddels...
This mode is not yet implemented. Please see the errata sheet for your
K3, also on the web in the manual page section.
73,
Lyle KK7P
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Is the KUSB a USB cable to go from the K3 to my computer's USB port...
Yes, it is a short cable that is USB on the end that plugs into your
computer and RSA232 on the end that plugs into your K3. You may need a
standard 9-pin male-to-female RS232 cable to reach between the K3 and
your comput
Is that rear panel mic jack a true tip-ring-sleeve jack?
Yes, all the 3.5mm jacks in the K3 audio I/O panel are stereo; none are
mono. The Mic jack is a stereo jack wired as mono, using the tip and
sleeve and not connecting to the ring.
73,
Lyle kK7P
_
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
loggi
Does the K3 have a CW indicator for tuning onto a cw station?
The answer is found here
< URL:http://www.elecraft.com/K3/K3FAQ.htm#CW%20Spotting > in the FAQ.
73,
Lyle KK7P
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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 thro
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
> 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 mo
Hello Bob!
> NO TOROIDS ;-).
Sorry, I was in a hurry :-/
> Yo Lyle! Nice job.
Thanks!
> Can't wait to see what I can shoe horn into the module.
I want to see what you do with it, too!
72,
Lyle KK7P
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> 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*
> 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 -
> 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 he
> 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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I assume you mean the rtc (real-time clock). It is on (or at least starts
out that way, with power on). However, after some time of
operation, I get
"not inst." The DSP filters work fine-- I just can't call them up in the
menu to edit them or make changes without doing the power on/off.
Is th
What devices would you recommend? I'm willing to spend $100, but I'd
prefer not to invest in some sort of industrial-strength device that
costs $500 or more and needs to be wheeled around. How well do these
things work for you?
I've been using a Hakko 493 for a couple of years. If you get it
Can anyone suggest reasonably costing plain-vanilla
earphones for ham use? What 2007 headphones are
available out there - be it WMart, RShack, or Bose?
I bought a pair of Labtec Icon-750 from <
URL:http://www.goldmine-elec-products.com/prodinfo.asp?number=G13112 >
and have been pleasantly sur
Hi guys, I need help. I wanted to fine tune my filters in my K2 with
DSP but I find I cannot access the DSP any longer.
Be sure the RTC menu item is set to on. It may have somehow gotten reset.
73,
Lyle KK7P
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Any idea when they will have a solution in place that doesn't involve
metal working?
All it requires is diagonal cutting pliers, the same as you use on
resistor leads, etc. in kit construction. It is not necessary to file,
grind, lap, etc the pins.
The next time DSPx modules are built, they
Can anyone explain terminology associated with the DSP unit...
1. soft filtering and standard filtering
Standard has steeper skirt selectivity.
2. Adjusting the "Beta (aggressiveness)" in the Denoiser
3. Adjusting the "hold/decay" time of the filter in Denoiser
4. The same in t
My soldering station which is an off-brand has bitten the dust so I'm
looking for a new, name-brand, IC-safe, temp controlled tip station. Any
recommendations for model...Hakko or Weller? I'm hoping to keep my
expenditure to $125 or less.
I have a pair of Hakko 936 and use them for everythin
I've just built K2 #5957 and installed the DSP unit. Radio and DSP are
both impressive as is. It seem "intuitive" to me that the DSP filter's
center frequencies should agree with the CW sidetone. That is, if I use
a 440cps side tone, then all the DSP center frequencies - on CW - should
be cente
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