Wayne, is the TCXO drift spec for the period after warmup, or does it include
the warmup period?
Steve N9SZ
At present, method 3 remains unimplemented. Fortunately the TCXO's
uncorrected drift is already less than +/- 0.5 PPM from 0 to 50 C.
This was the target for method 3.
73,
Wayne
N6KR
I find the CWT indicator very useful as a manual tuning aid, for auto
zero beating using SPOT, and for obtaining the proper decoding
threshold for CW, PSK, and RTTY. I am also one who uses the RF GAIN
control to minimize band noise and increase the S/N ratio of weak
signals. Unfortunately,
This bug in the wattmeter calibration still exists in the latest firmware.
Pressing XMIT during the wattmeter calibration does not transmit, and
pressing TUNE does not permit a change of the calibration paramter. On the
other hand keying the rig via a keyer does allow the calibration to be
Yesterday I overcame my fears :-) and successfully performed the
following mods on my K3 (S/N 1672):
K3 AF Mod (Line out speaker)
IF Output Buffer Gain Mod
K3 Extreme Signal RX Protection Mod
But, I was not able to perform the K3 AF Output Mod (two 470 ohm
resistors on the KIO3 board). I
Now that the K3 firmware is mature and the DSP noise reduction feature
works extremely well, isn’t it time for the firmware to retain NR
after power cycling? I’m not asking for memory of per band/mode NR
settings (although that would be wonderful!), but NR users should not
have to turn
I'm seeing an intermittent problem with the A/B button on my K3. When I
have VFO A and B set for different modes and frequencies, pressing the A/B
button sometimes copies the frequency from VFO B to A after exchanging
them, rather than exchanging them only (the mode is not copied). The
problem
I found that the problem was caused by PowerSDR software running for my
LP-PAN panadapter.
Steve N9SZ
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Post:
Jim:
I can get rid of the tone upon turning on NR if I do any of the following:
revert to v3.30
turn off switch tones
use my FL2 filter (500 Hz) rather than my FL1 filter (2.7 kHz)
and, of course, turning off NR
Wayne had me try an EE init, which got rid of the tone, but it returned
after a
I get a continuous tone when engaging NR, but it requires switch tones set
to on and my FL1 filter to be engaged. Wayne has tried to help me find the
cause without success yet.
Steve N9SZ
-Sinse installing the latest beta release I have a problem with a loud tone
-when I engage the NB. Has
This leads to the obvious follow-on suggest: Since the XG-2 signal
generator is used to calibrate the RF gain and the S-meter, why not
include the XG-2 generator as an internal feature of future versions
of the K3 (or K4)?
Steve N9SZ
Brett Howard said:
-So if someone has the 50uV
I’d like someone with a similar K3 configuration to help me diagnose
a problem by doing a test.
Required K3 configuration:
Filters- 2.7 kHz in FL1 and 500 kHz in FL2
KAT3 ATU
KXV3
KPA3 100 watt amp
V3.41 firmware
In cw mode, set your filter width to greater than 500 Hz to engage the
2.7 kHz
On May 26, 2009 Wayne wrote:
-This is referred to as ballistic tuning. We experimented with it but
-rejected it when we did the K2 design. I haven't tried it on the K3
-yet, but I've added it to my list.
-
-73,
-Wayne
-N6KR
Back in Jan 2008 there was a discussion of this on the reflector, and on
Hmm, are Lyle's other irons in the fire being heated for Eric's other
fish to fry? :-)
More seriously, I also would love to see changes to the noise reduction,
particularly to help
with weak signal work. I'm not sure why anyone cares about noise reduction
for
strong signals -- I just turn down
Don:
I had the same reaction upon first using my new K3 last year. The K3 is
significantly more sensitive than my previous rig (IC-756 non-Pro), and as
my noise environment is fairly high (inner suburb with ~110 dBm background
noise), at first it seemed as if the K3 is fairly noisy. Also, while
I was able to reproduce the noise that James is hearing on my #1672 K3. In
my radio it never reaches S7, but I don't have the KBPF3 option. Here, the
RIT and XIT settings do not affect the noise. It is mostly between 4.9 and
5.1 MHz as stated by W4TV.
I never would have noticed this without
After all this discussion of power control in DATA A mode vs SSB, I decided
to try using PSK31 with USB mode, rather than DATA A. I changed the MIC SEL
menu item to Line IN and adjusted the ALC meter to 4-5 bars using the MIC
GAIN control. The PSK31 power output appeared to closely match the K3
Another solution is to get an LP-PAN panadapter. This gives a great
panadapter plus two PowerSDR receivers. This weekend I was able to monitor
K5D on the K3 and/or the primary PowerSDR receiver and listen to (and
watch) the pileup on the PowerSDR subreceiver. PowerSDR allows you to put
the pileup
No I did not turn off compression. I will give this a try. Has anyone else
tried using PSK31 with USB mode?
Did you turn compression off?
Bob NW8L
On Mon, Feb 16, 2009 at 12:12 PM, steven.zabarn...@notes.udayton.edu
wrote:
After all this discussion of power control in DATA A mode vs SSB, I
I discovered that my cw power issue was due to a bad power supply for my
Elecraft W1 wattmeter. My cw power measurement now agrees with the K3
setting. I still see a 50% higher power output in Data A mode than the K3
setting -- this is an improvement over the nearly 100% that I was seeing
using
I installed the new beta last and tested the new output power control. I
don't see any improvement in PSK31 output power using DATA A mode. I still
get nearly twice the output power than I have dialed in by the PWR knob. In
the previous firmware, the measure output power in CW modes agreed with
Make sure that you are not in test mode. Is the TX panel indicator
flashing? If so press and hold TEST to turn it off.
Steve N9SZ
Dave N1IX wrote:
-I just received a new to me K3. It is a recent serial number 18XX.
-The receiver works fine but there is no output power. It goes into
transmit
Is Dave's S4 background band noise level unusual or should this be
considered normal? In my first tier suburban location I typically see S2 to
S3 background noise on the 20 to 40 meter bands using cw receive bandwidths
of 500 KKz. The first figure and table in the following link
slowly downward towards the original power up frequency.
This was for a cold K3 in my 52F basement shack. I calculate a drift of 3.6
ppm which is within the spec of the 5 ppm TCXO.
Steve N9SZ
-Steven Zabarnick/Research/FacStaff/UDayton wrote: -
To: elecraft@mailman.qth.net
From: Steven
During the past week I have noticed my K3 drifting during the first 20
seconds after power up. I hadn’t noticed this previously in my three month
old K3 (SN 1672), so I’m wondering if this is normal? With winter here it
is colder in my basement shack (maybe down 55 F), so perhaps that could
One unique feature of the K3 is that the S meter operates even when AGC is
turned off. Lately I've taken to operating often with AGC off to maximize
weak signal performance (using the RF gain to control volume), but have
noted that the S meter reading is a strong function of whether AGC is on or
I'm somewhat puzzled by the behavior of the AGC THR adjustment with respect
to band noise. My understanding is that the AGC THR setting adjusts the
level at which the AGC is activated. Thus, I would expect when listening to
band noise (QRN) that if the noise is activating the AGC, using a higher
Jack's measurements of the K3 AGC on the link listed below are quite
interesting. As my noise level on the low bands is usually at least S3 or
4, his plots indicate that the noise (S3 is approx -90 dBm) is either in
the linear range of the AGC, or just barely in the software AGC range.
Don't we
Oops, mistakenly sent this with the wrong subject line.
Jack's measurements of the K3 AGC on the link listed below are quite
interesting. As my noise level on the low bands is usually at least S3 or
4, his plots indicate that the noise (S3 is approx -90 dBm) is either in
the linear range of the
I experienced this pinched audio problem this weekend. Using the current
beta firmware, I noted severely pinched transmit audio (using the transmit
monitor). It occurred on some bands but not all, and was present sometimes
on only one of the sidebands (i.e., when switching sidebands the audio
Maybe it needs to be more robust? Last week I was attempting to tune a
short ladderline fed (via a balun) doublet on 80 meters using the KAT3. The
tuner successfully tuned the system for the cw part of the band, but had
trouble on 75 meters. I tried retuning a few times, and noted smoke and a
I use two doublet antennas, one hooked to ANT1 through a balun for 40M
which uses the KAT3 tuner, and a second (ANT2) in which I bypass the KAT3
and use an external Palstar BT1500A balanced tuner for 30-10M. Currently,
when changing bands I have to remember to bypass/set the KAT3 correctly. I
A previous reflector post described problems with chaining messages when
using the K3 internal keyer memories (M1-M4). I have also observed this
problem -- when tapping a memory to chain a message while a message is
already playing, sometimes the playing message is interrupted. I can
usually get
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