On Feb 20, 2011, at 3:50 PM, David Guernsey wrote:
Has anyone used cocoamodem with the k3 and a mac mini computer? ... In the
manual I find a microphone in plug which would be the line in, but find no
line out to take the computer audio back to the k3.
Which vintage of the Mac mini?
On Feb 2, 2011, at 2/21:37 AM, Julian, G4ILO wrote:
The most important thing when using PSK modes is not how much power
you are
using, but that the signal is *clean*, with the minimum of IMD
products. And
that is why with a barefoot K3 or any other 100W radio you should
not
On Feb 2, 2011, at 2/29:47 AM, gold...@charter.net wrote:
What is a good IMD report number and good SN number from a
receiveing station and what are the numbers that state you are
messing up the bands.
The transmit IMD that you see bandied about are 3rd order IMD numbers.
If you
On Feb 2, 2011, at 2/210:23 AM, Don Wilhelm wrote:
Lyle's the designer and he has stated that for data modes, 4 bars with
the 5th bar flickering is correct.
The 5th bar indicates the onset of ALC.
When I measured the transmit IMD from my K3 (using a dummy load and a
directional
On Feb 2, 2011, at 2/211:14 AM, gold...@charter.net wrote:
Thanks that now makes sense to me. However, than almost every signal
that I am looking at is outside of the two main carriers. Like little
spikes, I don't know how else to define it.
You only see two clean rails (plus IMD
On Feb 2, 2011, at 11:41 AM, Jim Brown wrote:
An important source of IMD (and harmonic distortion) is the sound card used
to generate the digital signal.
In the case of the K3, it is definitely poor IMD from the transmitter, since my
K3's transmit IMD was even worse when set to use the
On Feb 2, 2011, at 11:51 AM, ik1bxn wrote:
Usb : I'm not suggesting to integrate a conventional 232/Usb converter inside
k3...
That by the way, is what the TS-590S has done. Not just for serial, but for
audio also.
There is a single USB connector which hubs to a serial port for
On Jan 27, 2011, at 1/277:46 AM, Rich - K1HTV wrote:
Here is how long it takes the power, as read on the K3 and on a W2
watt meter, to recover after the PWR control is changed slightly...
Is this normal?
No, it is not normal. It is not hard to make it go away, however.
The power
I did a simulation also this evening (after off line discussion with N1AL) and
can confirm what Alan has said.
A 1 dB amplitude modulation only increases the keyclick noise floor by 0.5 dB 2
kHz away from the signal. It took a 6 dB difference in amplitude to raise the
keyclicks 2 kHz away by
On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote:
The effect on transmission bandwidth is negligible, and it's also extremely
unlikely to affect copy.
It depends.
Consider an RTTY demodulator that includes automatic threshold correction
(ATC). It will treat such a signal as one with 1 dB
On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote:
The effect on transmission bandwidth is negligible, and it's also extremely
unlikely to affect copy.
Hank W6SX had written to ask me for a rough guess of transmission bandwidth
when there is a 1 dB difference in level between mark and
On Jan 6, 2011, at 1/610:32 AM, Brian Alsop wrote:
Just how does one breadboard something with IC SMT parts having 0.025
(or other similarly small) lead spacing? I have a few projects here
that require this.
I am not sure they have precisely what you are looking for, but
Sparkfun has
On Jan 6, 2011, at 1/63:02 PM, Phil LaMarche wrote:
Will there be an app soon or the iPad which has a larger screen?
A good way to get K3 documentation onto an iPad is to take the PDF
files for the K3 Owner's manual, Programmer's Manual and schematics
from the Elecraft web site and drop
On Jan 5, 2011, at 1/510:10 AM, robt...@comcast.net wrote:
the K3 user manual states “The K3 directly supports CW/PSK31/RTTY
ASCII text transmit and receive via its RS232 port.”
You will need software that understands the KY command to transmit
RTTY data (Baudot, not ASCII) through
On Jan 2, 2011, at 4:01 PM, Don Wilhelm wrote:
Adding or subtracting a 1/8 wavelength of feedline
will often bring it into range, and that is normally the easiest
solution if the only thing you are considering is the ability of the
tuner to produce a match.
You can see what Don means by
On Jan 2, 2011, at 5:52 PM, Kok Chen wrote:
You can see what Don means by taking a look at this figure (KAT3 at 1.8 MHz,
with Smith Chart centered at 50+i0 ohms):
http://homepage.mac.com/chen/Technical/Tuner/tuner1.8.png
I should add that, if memory serves (it has been a while ago that I
On Jan 2, 2011, at 5:52 PM, Kok Chen wrote:
In the case of the K3, you may have to try everything up to about 3/4 of a
wavelength since the green and blue parts are not symmetrical. (Yes, 3/4
wavelength at 160m is no fun :-).
My mistake, that should be everything up to 3/8 of a wavelength
On Dec 31, 2010, at 12/316:22 AM, Bob Naumann wrote:
1) Why is the FT5000 at the top of the list? (And not the K3 when
they both get a 101 in the column the table is sorted on?) Is it
because the FT5000 is newer so it goes at the top?
I don't know if it is Rob Sherwood's rationale,
On Dec 31, 2010, at 2:27 PM, gold...@charter.net wrote:
I have tried different settings for mike input for rear line in and
everything that everyone has suggested.
If you have already turned on VOX in DATA-A mode and nothing works still, try
measuring the sound card's audio with a
On Dec 31, 2010, at 12/313:09 PM, don Swetzig wrote:
VOX is not an option in DATA-A mode K3 says N/A in the menu.
VOX should be available in DATA A and AFSK A modes, but not in FSK D
and PSK D data modes.
Use the MODE button to switch to DATA mode and then hold down the DATA
MD
On Dec 29, 2010, at 12/2910:12 AM, radioshoppe wrote:
As mentioned in my email about the best I can do with Method 2 is
about +/20 hz.
Do you have an RTTY program that has a crossed-ellipse display
(affectionately called crossed bananas by RTTY nuts)? If so, that
might get you
On Dec 25, 2010, at 3:45 PM, George Jan wrote:
My SignaLink (USB sound card) worked just as easily.
It is a completely different story with that one.
16 bit Audio is an integral part of the USB Class specifications.
The chip in the SignaLink (TI/Burr-Brown) is compliant with the USB
On Dec 20, 2010, at 12/203:36 PM, Eric Swartz - WA6HHQ, Elecraft
wrote:
http://www.elecraft.com/books/books.htm
Is Elecraft still shipping the Second Edition of the ARRL HF Digital
Handbook whose cover is on that page? The 4th Edition has been out
since 2007!
73
Chen, W7AY
On Dec 13, 2010, at 12:49 PM, Andrew Meyer wrote:
I had considered using a Signal Link but is there really any reason to do so?
In your case, there is no reason unless the K3's turn around time is too slow
for Winmor when using the built-in VOX. You'll have to check that part out.
The
On Dec 10, 2010, at 12/1011:32 AM, Paul Wilton wrote:
Just about any old USB soundcard will work with a MacBook Pro - I
use an old Creative USB Soundblaster that I picked up second hand.
Noting that you can plug in an iPhone headset, I did experiment
using an iPod Classic 4 pin
On Dec 9, 2010, at 12/99:17 AM, k...@aol.com wrote:
But, since AGC works on every signal in the passband, if there are
two signals - one S9 and the other S3 appearing at the same time,
the S3 signal will disappear because the AGC is knocking down the
S9 signal to an S3 level and
On Dec 9, 2010, at 12/910:04 AM, Edward R. Cole wrote:
But reading, over and over and building kits got me more knowledge
about real electronics than 80% of my fellow EE majors had.
There were a few with military training that had hands-on. My
knowledge came with the years, and
The K3 manual, like the FT-1000MP manual, seems to have an index that is
ordered by Functions, which is natural for manufacturers and designers but
perhaps not so much for users. The manual is written from the point of view of
somebody who already knows how to use the K3.
Someone had
On Dec 3, 2010, at 12/36:44 AM, Jan Erik Holm wrote:
So now we have a 2 ms claim for the K3. I know I measured it to 5 ms
but this was something like 2 years ago.
What is it? Can Elecraft please tell.
Quite possibly the waveshaping is done by an FIR window. So the
design parameter
On Dec 3, 2010, at 11:06 AM, Jan Erik Holm wrote:
Yes 99% of all CW stations clicks at the break side.
That makes perfect sense, Jan.
If they are using simple IIR filters, the slope discontinuity is worse at the
onset of switching than when it is at the end of the leading edge or trailing
On Dec 3, 2010, at 12:19 PM, Corboy - Poteet wrote:
So my question is: if someone puts a spectrum analyzer on the CW output of a
K3, are key clicks detectable? On make, on break? Close in, far out, in
between?
If you have one of these new fangled digital 'scope that takes a USB memory
On Dec 1, 2010, at 10:37 PM, Leigh L. Klotz Jr WA5ZNU wrote:
Kok Chen provides some good references for CW transmit shaping, but
cocoaModem source isn't available for hams to look at.
Sure it is. cocoaModem sources has been public from the time cocoaModem was
written in the days Mac OS X
On Dec 2, 2010, at 12/24:32 AM, Barry N1EU wrote:
Are you saying that wide sidebands measured with the rig at 4msec
rise-time are probably not going to be even wider with the rig at 1
msec rise-time?
Not that much, since the really far off keyclicks are mostly from
higher order
On Dec 1, 2010, at 12/112:32 PM, K9ZTV wrote:
The list goes on and on . . .
Sako Hasegawa, JA1MP (General Television Co and Yaesu Musen)
73
Chen, W7AY
__
Elecraft mailing list
Home:
On Dec 1, 2010, at 2:26 PM, K9ZTV wrote:
Sherwood sorts on Dynamic Range-Narrow Spaced, and both rigs are 101db at 2
Kcs.
If I correctly grok Rob's numbers, the K3 requires the use of a very narrow
roofing filter (200 Hz) to attain the 101 dB of dynamic range (i.e., the two
beating
On Dec 1, 2010, at 5:59 PM, Barry N1EU wrote:
It's absolutely amazing, after years of Yaesu being called out and doing
nothing about key clicks in their rigs, that they would bring out a radio
(FT-5000) and provide the user the ability to reduce the cw rise-time to 1
msec (menu mode, cw
On Nov 27, 2010, at 11/275:14 AM, Joe Subich, W4TV wrote:
MixW has a dual [RTTY] receive capability - I don't know about any
of the other software.
On the Mac OS X side, cocoaModem has two independent receive channels
in the wideband RTTY and the dual RTTY interfaces. There are two
On Nov 20, 2010, at 12:43 PM, Wayne Burdick wrote:
Any difference must be attributed to noise and signal conditions, filter
bandwidth settings, or APF tuning vs. actual signal pitch. This is the nature
of APF; it is most effective under specific conditions. Try turning it on,
and if it
On Nov 16, 2010, at 2:25 PM, Wes Stewart wrote:
There is a serious misconception by some true believers that Elecraft
invented down-conversion (or at least conversion) to an i-f in the 8 to 9
MHz range.
Nothing could be further from the truth, and I know that the folks at
Elecraft
On Nov 16, 2010, at 3:17 PM, Kok Chen wrote:
Check out Solid-state Receiver Design with the MOS Transistor in April and
May 1967 issues of QST (WB6AIG is now K6GT).
Whoops, George beat me to it :-).
73
Chen, W7AY
__
Elecraft
On Nov 16, 2010, at 3:02 PM, Mike K2MK wrote:
Moving the shack CAT 5 cable away from other radio related cables is having a
positive effect. Next I'm going to try a shielded CAT 5 cable from the wall
to the shack PC.
I can attest to the effectiveness of shielded Ethernet cables (for me
On Nov 16, 2010, at 3:51 PM, ab2tc wrote:
I'd love to but where do I find the article? I don't think my local library
has many back issues of QST.
You should be able to read (some of) them at the ARRL web site if you are an
ARRL member.
If not, you can try the QST View CD-ROMs.
ARRL no
On Nov 1, 2010, at 12:53 AM, David Woolley (E.L) wrote:
Quote para 2, both points: Reciprocity still applies with respect to gain
and off axis effects.
My mistake. David is correct on this point.
Given a constant signal power across the receiving antenna terminals, the SNR
would be
On Oct 31, 2010, at 10/3110:05 AM, Byron Servies wrote:
Naieve newbie question, because im missing something here: if the
signal you want is that hard to receive, what are the chances the
other station will be able to hear your reply?
Since I use simple antennas, and even though I
On Oct 31, 2010, at 6:13 PM, Jeff Cochrane - VK4BOF wrote:
I know nothing of CW and it's esoterics but it seems to me that maybe this
APF thingy maybe of some use to digital signals too, as in peaking up a
(very) weak PSK31 signal or something of that nature.
Would that be the case?
IMHO,
On Oct 31, 2010, at 7:54 PM, Paul Christensen wrote:
Perhaps a quasi anti-LMS algorithm could be used to establish Auto APF.
Does such an algorithm now exi[s]t by name?
(For those who are not familiar with LMS, it was an algorithm created by Ted
Hoff for his dissertation, under the
On Oct 27, 2010, at 1:06 PM, Paul Christensen wrote:
And the reason why some of us have been stating that roofing filters and
brick-wall DSP filters, as good as they are for their intended purpose,
cannot equate to the results obtained by the APF.
Indeed.
If you squint a little at the
On Oct 27, 2010, at 5:38 PM, Robert Seymour wrote:
Instead of two-ring figure for the MMTTY XY plot, I only get a blob and
jibberish printing out. When running WriteLog, the sound card is able to
take WAV files and input them to my K3 transceiver.
If you are seeing a fuzzy blob at the
On Oct 26, 2010, at 4:07 PM, Don Wilhelm wrote:
It simply boggles my mind that someone would want to change his chosen
sidetone pitch.
Don, the difference on usability could perhaps boil down to this:
In one case you are trying to peak a signal with a fixed pitched inside noise.
There is
On Oct 24, 2010, at 4:57 PM, Jim Spears wrote:
I hear a single tone in the monitor and the P3 also shows the same thing.
A microKeyer does not modulate the FSK keying signal unless the keyer is
commanded to do so by the software that is controlling it. If nothing is sent
to the keyer from
On 10/17/2010 1:40 AM, Jan Erik Holm wrote:
This will go nicely with my K3
http://www.youtube.com/watch?v=9tIZUhu21sQ
Seawater has electrical conductivity of seven *orders* of magnitude
lower than copper!
As a quick and dirty check, I created a simple 10m ground plane
antenna in NEC-4.
On Oct 5, 2010, at 12:36 AM, David Woolley (E.L) wrote:
The Shannon formula, and in particular the error free condition, is only
valid for gaussian noise.
Yes, the main Shannon Theorem (Theorem 17) mentions thermal noise. (In
addition to being Gaussian, Theorem 17 also requires that the
On Oct 4, 2010, at 12:41 PM, John Ragle wrote:
I must be missing something here. How can one expect high fidelity audio
(e.g. 20 HZ to 20 kHz) with a receiver with a pass-band of 2.5 or 3.0
kHz?
With those strictures, one is always going to get carbon mike or
slightly better audio,
/
---
The disadvantage of Java loggers is that there is no way for them to
interoperate with other Mac OS applications through AppleScript.
73
Chen, W7AY
On Sep 29, 2010, at 9:48 AM, Kok Chen wrote:
On Sep 29, 2010, at 8:42 AM, J FRANCIS G3LWI wrote:
Anyone know of suitable logging program that I can
On Sep 29, 2010, at 8:42 AM, J FRANCIS G3LWI wrote:
Anyone know of suitable logging program that I can use with the Apple/Mac
computer
MacLoggerDX
. by Don, VE3VRW
. not free
. everything and the kitchen sink
. Cocoa framework
http://www.dogparksoftware.com/MacLoggerDX.html
---
On Sep 29, 2010, at 12:01 PM, Joe Subich, W4TV wrote:
Tom is using a DigiKeyer II and K3 with RUMlog, uH Router and cocoaModem
during his current stay in Rwanda.
Tom was using RUMped, not RUMlog at 9X0TL. And µH Router was never in the
loop; RUMped talks directly to the digiKeyer II.
On Sep 23, 2010, at 4:37 PM, Ray Sills wrote:
The difference in power between 50 watts and 100 watts is essentially
insignificant.
Whether 3 dB of power difference is important depends on band conditions.
Alex (Mr. CW Skimmer) VE3NEA has a nice set of measurements that he'd made a
few years
On Sep 21, 2010, at 5:19 PM, Jeff Cochrane - VK4BOF wrote:
SSB is called mode A3J in most of the legal documents that govern our hobby.
The reason why the mode is called A3J in all the legal stuff is that the 3 is
the maximum bandwidth in khz that is permitted.)
The 3 in A3J has nothing to
On Sep 19, 2010, at 9/199:47 AM, Bill K9YEQ wrote:
I find the process simple and it works well for upgrading any of
the K3 devices. The procedures for firmware updating both P3 and K3
aren't fool proof.
While better but still not 100% foolproof, the Canon cameras that I
have can
On Sep 16, 2010, at 9/169:59 AM, Jim Brown wrote:
A VERY large component of fading is due to multipath -- that is,
the arrival of more two or more wavefronts that travel different
paths, and
thus have slightly different travel times.
Selective fading does not require multipath. The
I just rummaged around in Google and found a different paper that
Watterson wrote related to HF propagation and digital modes (almost 10
years after his HF channel model paper):
http://www.its.bldrdoc.gov/pub/ntia-rpt/79-29/79-29.pdf
His conclusion definitely advocates the use of diversity
On Sep 16, 2010, at 1:55 PM, Alan Bloom wrote:
I think there are some free filter design programs on the web that can design
an all-pass network. It may need to be a big filter (i.e. lots of
coefficients) to get good amplitude and phase accuracy over a 10:1 frequency
range (300 Hz to 3
On Sep 15, 2010, at 10:15 AM, Alan Bloom wrote:
If you turn on averaging in the waterfall you can see farther down into the
noise. It works best on steady carriers. With CW signals you have to keep
the averaging time less than a dit.
I have found that per-bin averaging of the power
On Sep 13, 2010, at 3:00 PM, David Gilbert wrote:
If I install two identical sound cards in my computer, is there any way to
separately identify them so that one Windows application would always use one
of them...
On the current version of Mac OS X, every sound device has a unique device
On Sep 5, 2010, at 5:21 PM, David Fleming wrote:
But the Keyspan and FTDI adapters get very grumpy when they wake up after
being put to sleep.
The way I handled this in µH Router (the microHAM devices uses FTDI chips) is
to register for MacOS X Power Manager callbacks.
Before the Mac OS X
On Aug 14, 2010, at 8/149:57 AM, Dennis KB7ST wrote:
KB7ST: What is the advantage of choosing a MARK tone other than 2125?
Many RTTY ops don't like to listen to such a high pitched tone pair in
their headphones. If you are tuning by ear, it is also easier to
figure out how far and
On Aug 12, 2010, at 8/129:09 AM, Lyle Johnson wrote:
... Tuning is critical and an error of more than 5 Hz changes from
solid copy to no copy.
With a binary PSK demodulator, you can be off tuned up to an amount of
plus or minus 90 degrees of perfect phase coherency between bit
On Aug 5, 2010, at 8/58:16 AM, David Ferrington, M0XDF wrote:
I might be asking for an iPad version soon (or has Wayne beaten me
to that? :-)
You might find that it is a challenging exercise to connect the iPad
to the RS-232 port of the K3.
There is a USB jack in the iPad Camera
On Jul 23, 2010, at 12:41 PM, Brett Howard wrote:
Just bought the last copy of this book that Amazon had in stock for
17.95 + 3.99 in shipping. Looks like it will be a very nice reference
to have on the shelf...
Understanding, Building and Using Baluns
and Ununs by the late Jerry Sevick,
I just did a quick experiment.
First, I lied to my K3 that my 400 Hz filter is really a 2.8 kHz filter. I
then turned AGC off and set the K3 WIDTH setting to 2.4 kHz.
This way, I will be able to see the response of both the 2.4 kHz DSP filter and
the 400 Hz roofing filter, as Dr.
On Jul 18, 2010, at 6:11 PM, Jim Miller KG0KP wrote:
Made me wonder though if one could decode two signals intertwined but
individual mark and spaces traces in the clear form each other?.
Yes, you can, and the method is regularly used by some RTTY folks.
It is called Mark-only or
On Jul 15, 2010, at 10:10 AM, Jim Brown wrote:
I always go under the assumption that if one guy wants to know
something, several other list members do too.
I usually go off list, which I very often do, when the question gets specific.
Stuff like K3 sees no transmit audio from cocoaModem.
On Jul 14, 2010, at 10:31 AM, Wes Stewart wrote:
Chen does your K3 PA talk back?
Nothing that I can hear over my tinnitus, Wes.
73
Chen, W7AY
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
On Jul 10, 2010, at 7/102:57 PM, Joe Subich, W4TV wrote:
If one were going to provide digital output, it would be far better
to stream the raw in I/Q data from the DSP's ADC via firewire rather
than push it through two additional A/D and D/A steps and reduce it
to a single channel of
On Jul 12, 2010, at 7/1210:25 AM, Wes Stewart wrote:
I haven't gotten very far with this because 1) the IMD is apparently
temperature sensitive and drifts, becoming a moving target
For what its worth, when I ran close-spaced IMD measurements (*very*
closed spaced -- the BPSK31 idle
On Jul 6, 2010, at 10:06 AM, Jim Brown wrote:
Because MOST fading is
the result of cancellations between a direct wave and a reflected wave
arriving at some particular point.
HF fading is actually a very interesting phenomenon, and definitely not just a
case of signal cancellation.
If
On Jun 13, 2010, at 2:07 PM, N1JM wrote:
In real world operating, has anyone really experienced a difference or could
tell a difference?
When you are a weak station looking for holes in between loud stations to put
yourself in, yes, it will matter how wide those stations are.
(It is like
On Jun 12, 2010, at 6/125:09 AM, Richard Ferch wrote:
Brett Howard wrote:
I do see FSK as a method that is slightly less prone
to TX distortions.
I have done some testing with a second
receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK
(lower odd-order sidebands).
On May 18, 2010, at 4:58 PM, Jim Bennett / W6JHB wrote:
My question is, what'll I need to use MacLoggerDX and CocoaModem with the
K3? I figure I'll need to replace the Icom cable on the SL-USB for
CocoaModem, right?
The SignaLink USB will not be of any use with MacLoggerDX. You will need to
On May 11, 2010, at 9:14 AM, Jon Perelstein wrote:
I have noticed that the longer my CQ string, or the more I repeat it, the
more frequently I get a response to the CQ. I've also noticed a lot of
stations that repeat their 3x3 CQs at least two or three times before they
get an answer.
On May 2, 2010, at 10:03 AM, Rick Prather wrote:
I sometimes do that [using cocoaModem] for a backup and it will display the
incoming CW speed.
Should probably qualify it with roughly the incoming CW speed when the SNR is
good, and the guy sending the Morse is not afflicted by some weird
On Apr 30, 2010, at 4/309:08 AM, Jim bennett wrote:
Just curious if you other Mac OS X users have had
positive experiences with the K3 Software on that platform? It is
well-behaved? Easy to use?
While I have only used the K3 Utility for firmware upgrades, I've
found the Mac OS X
On Apr 29, 2010, at 4/299:26 AM, Matt Palmer wrote:
... ipad doesn't have i/o at all, no audio input...
You are probably not aware that the iPad's Camera Connection Kit
supports a USB Class Compliant sound card.
73
Chen, W7AY
On Apr 29, 2010, at 4/2910:11 AM, Matt Palmer wrote:
And then an app needs to be written that supports all that...
A very basic PSK31 app for the iPod Touch has been available through
the Apple app store for a while now.
http://itunes.apple.com/us/app/i-psk31/id329842689?mt=8
This web page is intended for web designers, but is useful for designing any
color based user interface:
http://www.iamcal.com/toys/colors/
It lets a person with normal color vision see what people with various color
deficiencies see.
For example, when you check the various common anomalies
On Apr 17, 2010, at 10:54 AM, lstavenhagen wrote:
That's because you're dramatically oversimplifying #2 hi hi. There you
forgot, keyboard, mouse, external monitor, drivers (introduce first 3rd
party here), searching internet for fixed drivers, installing LP-PAN (3rd
party #2) and associated
On Apr 4, 2010, at 11:22 PM, George A. Thornton wrote:
It has been recommended to me that I get the SignaLink USB interface
because it is easy to work with and reliable.
The SignaLink USB contains two functions:
(a) a 16-bit sound card (Burr-Brown 2909 chip) and
(b) an audio activated
On Apr 5, 2010, at 4/57:33 AM, lstavenhagen wrote:
Still with PSK31, trying it out with cocoaModem, I find I can't keep
the
buffer full. I can get ahead on simple plain language but throw some
numbers
and punctuation in there and the buffer catches up pretty quick. 45
baud
RTTY
On Apr 4, 2010, at 4/46:50 AM, chen dave wrote:
I use K3 internal 2 tones test function + SDR-IQ+ SpectraVue3.
Are you ignoring the crest factor of the two tone test signal?
To get 100 watts average RF power from a two tone signal, the
instantaneous peak power has to be nearly 200
On Mar 27, 2010, at 7:13 PM, David Christ wrote:
I am not an expert on FFT and higher math, but
would someone please explain to me what discretize signifies that is
not covered by quantize.
The word discrete in DFT refers to discrete time samples, and not to the
quantization of the
Many applications on Mac OS X keep support files in [/Library/Application
Support] and [~/Library/Application Support].
Check [~/Library/Applications Support/Elecraft/] for the Elecraft K3 Utility
support files.
Static resources (GUI, Icons, AppleScript definitions, etc) are stored in the
On Feb 16, 2010, at 12:39 AM, turnbull wrote:
When you write the manual for the P3 would you please include a good
explanation of the use of waterfall displays. I have one on my OII but do
not fully understand its benefits.
Spectrograms, such as waterfalls, make use of your eye-brain
On Feb 16, 2010, at 2/168:33 AM, Julian, G4ILO wrote:
PSK31 was invented by G3PLX and there was a waterfall in
his reference implementation of the mode, psk31sbw.exe.
I stand corrected.
73
Chen, W7AY
__
Elecraft mailing list
I had recently made some measurements of RTTY and PSK31 which shows
that sound card driven programs using DATA-A can put out a cleaner
transmitted signal than the K3's internal generators in the PSK-D and
FSK-D modes.
Unlike many other rigs, the K3 is very forgiving about the precise Mic
On Feb 8, 2010, at 3:27 PM, Julian, G4ILO wrote:
By 50 watts average PSK power do you mean PWR set to 50, or PWR set to 100
or whatever gives an average 50W out?
50 W with PWR knob, and measured to be close to 50W on an external averaging
wattmeter with an idling Varicode on BPSK31
This
On Jan 31, 2010, at 1/3110:34 AM, Roger D Johnson wrote:
I started on this topic because the tuner failed to find a good
match at
1800.
To see the approximate range of the internal K3 antenna tuner at 1800
kc, take a look here
On Jan 30, 2010, at 9:57 AM, N2TK, Tony wrote:
Does anyone make a sound card, internal or external that has two separate
inputs/outputs?
I believe stereo sound cards are actually more common than mono sound cards.
Edirol (I think) makes an inexpensive mono USB sound card, but almost
The spectra can be seen at
http://homepage.mac.com/chen/temp/audio1.png
http://homepage.mac.com/chen/temp/audio2.png
http://homepage.mac.com/chen/temp/audio2.png
(Estimated using cocoaModem's spectrum display with 1.5 second exponential
averaging of each FFT bin. Please ignore the red
On Jan 6, 2010, at 9:08 PM, Kok Chen wrote:
The spectra can be seen at
http://homepage.mac.com/chen/temp/audio1.png
http://homepage.mac.com/chen/temp/audio2.png
http://homepage.mac.com/chen/temp/audio2.png
Oops, the last one should be
http://homepage.mac.com/chen/temp/audio3.png
I apologize if the experiment was actually to discover if the people who had
complained about listening fatigue could actually identify the K3.
I had hoped that being able to compare the profile of the filters could lead
Elecraft to create a bandpass design that sounds the least fatiguing.
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