David,
I concede on that, and yes, warmup drift is normal. I erred in using
JT65 as the example, it just requires frequency stability (which the K2
can do after warmup). What I really intended are a few modern data
modes that I understand must be 'netted' to a specific frequency, down
to th
Don,
I use my K2 on JT65 all the time, in fact I hardly ever even pick up the
microphone anymore. I find that I need it to warm up for about 15 minutes
before the VFO stops slowly drifting. However, even cold, the short term
drift on the K2 is slow enough to run JT65 without issues (at least mine
John,
Certainly, this is a valid reflector for any Elecraft product.
Don't worry about exactly 4.000 MHz on that reference oscillator. It is
only important that it be "right on" just before running CAL PLL
followed by CAL FIL - and the frequency may not be exactly 4.000 MHz
when set properly
The following app nite from Elecraft describes a great way to calibrate the
dial on your K2:http://www.elecraft.com/Apps/K2%20C22%20Adjust%20App%20Note.pdf
After setting C22 and running CAL PLL, don't forget to also run CAL FIL and
update the BFO setting for each filter (even if you just increase
Hi
Do people still ask about the venerable K2 on this group? hi
my K2 serial # 5312 :
I built it 9 yrs ago now.
SO, I went back and (nervously) re-opened my K2 and re-did some of the
calibration routines.
The 4 Mhz calibration would not zero beat at 4. Mhz but at 3999.8
The PLL ref
Good day group,
I've used the XG2 to calibrate the S-meter of my K2 and got calibration
results of S-LO of 191 and S-HI of 007. My 50mv input results in an S-9
signal (6 segments on the bar graph), turning off the XG2 results in 1 bar
flickering. So far so good according to the book. The curiosit
Copying this to the reflector in case someone else has seen the same
issue. This is K2 S/N 6698.
OK here is the run down on all bands:
Band Displayed error
160m .98 20hz low
75m.99 10hz low
60m.99 10hz low
40m.99 10hz low
Jim N2EY wrote:
With the SX-28 or similar receiver, you actually adjusted the LC tuned
circuits and other parameters yourself. You didn't "request" anything - you
changed
the parameters directly.
-
My point is that the dial mechanism is a simple form of mechanical lo
Fred, K6DGW, wrote:
Mine seems to drift about 450 Hz from cold-start to scheduled QSO time,
over maybe 30 mins which is great as far as I'm concerned.
---
Is that your K2 that drifts that much or the SX-28? I can imagine the SX-28,
but the K2 should not drift more than perhaps
On Tue, 25 Apr 2006 09:50:55 -0700, Darrell Bellerive wrote:
> Then again, WWV
>is only accurate as received to +/- 1Hz (1 part in 10 million).
After using systems having timebases slaved to rubidium and cesium
standards ("atomic clocks") where expected stability and accuracy is
1 part in 1
On Tue, 25 Apr 2006 09:50:55 -0700, Darrell Bellerive wrote:
> Then again, WWV
>is only accurate as received to +/- 1Hz (1 part in 10 million).
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On Tue, 25 Apr 2006, EricJ wrote:
And the K1 is all the better for it too with the silkiest tuning of the
bunch.
I'm also mystified by the compulsion to measure operating frequency on a ham
BAND to a few Hz.
It would be useful for another thing I've never understoodthe exact resonant
fre
With all this talk about calibration, I thought I'd go through the procedure
again just to check and see how ole #337 was doing. I don't remember
exactly when I last calibrated it, but it has to be over a year, perhaps
over two. She was 10 hz low at 10.0 Mhz checked against WWV. Didn't have
to a
replacement for the code requirement.
Eric
KE6US
www.ke6us.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, April 25, 2006 5:30 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Calibration using WWV
btw, although the
Ron D'Eau Claire wrote:
> Right, Fred, but notice that's what you did with your SX-28
> too! You turned the dial to make a frequency mark line up
> with the indicator. That was "requesting" a frequency.
Well, I was just sort of reflecting on our world. Wilbur and Orville
would be astounded. Ma
In a message dated 4/25/06 7:12:19 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
> Fred, K6DGW wrote:
> So ... running my K2 is like flying an F-16 or F-117A. I don't actually
> "control" the aircraft or radio, I "request" the computer to control it
> for me and hope it is listening?
>
Fred, K6DGW wrote:
So ... running my K2 is like flying an F-16 or F-117A. I don't actually
"control" the aircraft or radio, I "request" the computer to control it
for me and hope it is listening?
---
Right, Fred, but notice that's what you did with your SX-28 too! Y
Matt,
No 400 Hz tones are transmitted by WWV - you may want to check their format
webpage for full information, but the tones are 500 and 600 Hz on alternate
minutes with 440 Hz being transmitted the 2nd minute after the hour except
that the 440 Hz tone is omitted during the first hour of each day
There are three different signals on WWV 100, 400 & 500 Hz. I assumed
that if those signals had the proper relative frequencies that all I
had to do was check the absolute frequency. The Elecraft 2T-gen fit
that requirement with its two frequencies of 700 & 1900 Hz.
I prefer the PSK31 waterfall
Ron D'Eau Claire wrote:
> Many folks new to the K2 don't realize that what they see
> on the frequency display is NOT the actual frequency. It's
> the "requested" frequency chosen by either punching in a
> frequency on the keypad or turning the dial.
So ... running my K2 is like flying an F-16 or
In addition to the inevitable drift in tunable oscillators, there is the
accuracy ("resolution" is a more common term) of the Digital-to-Analog
Converters (DACs) used in the K2 logic.
During CAL PLL and CAL FIL, the DACs must 'read' the analog tuning voltages
used to set the oscillators on freque
Thanks Nick and Don for the explanation of the accuracy of the soundcards and
K2 sidetone.
On April 24, 2006 11:40 pm, Nick Waterman wrote:
> ... but it'll be within a few percent, surely, and that means you'll be
> within a few hertz of 100Hz? The K2 tuning steps are likely to be a lot
> bigger
Darrell,
Since the limit of tuning precision for the K2 is 10 Hz, there is no benefit
to be derived by attempting to tune WWV or other standard frequency station
to less than 10 Hz - and that is well within the error range presented by a
computer soundcard. In other words, even if the error in th
Darrell Bellerive wrote:
> Please expand on this. I have never used a PSK application, but how would it
> detect the subcarrier is exactly at 100 Hz? I suspect the software is using
> the soundcard clock as a reference and that wouldn't necessarily be very
> accurate.
... but it'll be within a
On April 24, 2006 01:56 pm, Matt Osborn wrote:
> WWV provides a BCD subcarrier at 100Hz that is always present. Using
> HRD's PSK31 (it's free; thanks Simon!) it is a simple matter to adjust
> the tuning to the proper frequency.
Please expand on this. I have never used a PSK application, but how
Don (and others)
WWV provides a BCD subcarrier at 100Hz that is always present. Using
HRD's PSK31 (it's free; thanks Simon!) it is a simple matter to adjust
the tuning to the proper frequency.
On Mon, 24 Apr 2006 10:01:19 -0400, "Don Wilhelm"
<[EMAIL PROTECTED]> wrote:
>Thanks for posting this
I connect the computer running Spectrogram and listen to the transmitted
tones - WWV transmits 500 and 600 Hz tones on alternate minutes, and I look
for these tones displayed on the Spectrogram screen - I set markers at 500
Hz and 600 Hz - then adjust the tuning until the tones line up with the
ma
I do this a LOT - and I spend the 'patience' time cleaning up the
workbench - but even that is not enough time, the workbench is still 'messy'
73,
Don W3FPR
> -Original Message-
> (http://tf.nist.gov/stations/iform.html). Some minutes have NO tones.
> Patience is required.
>
__
Watch out for the 440 Hz tones near the top of the hour. You also need a
clock. The schedule is published.
(http://tf.nist.gov/stations/iform.html). Some minutes have NO tones.
Patience is required.
Dan / WG4S / K2 #2456
I connect the computer running Spectrogram and listen to the transmitted
ton
Thanks for posting this Tom. It has since been written as an application
note and is available on the Elecraft website in .pdf format - see
http://www.elecraft.com/Apps/K2%20C22%20Adjust%20App%20Note.pdf
I have only one thing to add and that is for us 'tone-deaf' folks tuning WWV
precisely may be
Douglas:
I've just completed soldering the K2, and have WWV at 10Mhz tuned
in. The display shows it at +380 hz high. According to the manual,
on page 60, the K2 can be calibrated using WWV. Unfortunately I do
not see the procedure to do this. Is it published ? Could I have a
link to a a proce
I've just completed soldering the K2, and have WWV at 10Mhz tuned in. The
display shows it at +380 hz high. According to the manual, on page 60, the
K2 can be calibrated using WWV. Unfortunately I do not see the procedure to
do this. Is it published ? Could I have a link to a a procedure on how
Good Evening,
I've just completed soldering the K2, and have WWV at 10Mhz tuned in. The
display shows it at +380 hz high. According to the manual, on page 60, the
K2 can be calibrated using WWV. Unfortunately I do not see the procedure to
do this. Is it published ? Could I have a link to a a p
Eric wrote:
I have made two automatic calibrations on my K2. The first one early in
the building-process and the second was the VCO linerization.
Are these processes "run once" and not possible to run again? Or is there a
way to make a factory reset of all parameters?
I don't know when I want to
Eric,
Once the proper values are written into the EEPROM by the CAL PLL and CAL
FIL processes, they should remain stable unless the PLL reference oscillator
frequency changes substantially (similarly the BFO Frequency).
The most important thing to assure accuracy is to carefully set the K2
refere
Hi again,
This is not an question about my rig, it's more like a wondering...
I have made two automatic calibrations on my K2. The first one early in
the building-process and the second was the VCO linerization.
Are these processes "run once" and not possible to run again?
Or is there a way t
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