Jan Erik Holm wrote:
Please Elecraft, make a FW change and limit the radio
to 100W, thanks!
Human nature being what it is, the likely result of this would be a
large number of people refusing to upgrade their firmware any further
and a significant grapevine message about how new purchasers
I didn't bother about paying/asking for matched default filters for my KRX3.
The one in the main board has a -0.93kHz offset and the one in the KRX3 is
-0.83kHz.
Shifting them both to -0.88kHz seems to make no difference to performance -
would you expect a 50Hz shift in a nominal -6dB b/w of
Conditions were quite good this week with only a little QRM.
Topics were:
French amateurs running AM nets on 3550 KHz, usually active most
mornings, plus the usual fishing boats...
S-Meter calibration on both the K2 and K3. General view was that the K3
can be very accurately calibrated.
Softrock
Jan Erik Holm wrote:
After measuring the TX IMD on SSB I stopped putting the
radio above 100W.
Jim try setting your power supply so you have 13.8-14.0V key down at maximum
power and see if that helps the IMD some.
73, Bill
--
View this message in context:
On Sun, Dec 21, 2008 at 12:52 AM, Joe Subich, W4TV
li...@microham-usa.com wrote:
[snip]
so it really boils down
to is six meters and the tuner worth the extra $1000.
[end snip]
I'm not sure where you got the extra $1000 from. Currently, HRO is
selling the Quadra for $2999. Great price for
After reading the recent comments on POWER OUT, I decided to check mine.
Using the voltmeter on the K3
Zero power out: 13.6v
5 watts out: 13.3v
100 watts out: 13.1v
The drop from 13.6 to 13.1 for 100w doesn't seem so bad. But why the
drop when running only 5 watts out...seems out of
Softrock and Rocky, pay attention to the cables between the Softrock and
the sound card input, especially watching the balance.
I didn't listen to the UK Elecraft net this morning so I'm not aware of the
context, however when I
started building Softrock's I encountered the familiar centre
I want to replace the element in a Kenwood MC-50 with an electret. I know
that the K3 provides bias voltage to pin 1 on the front mic connector which
is also the audio line - as long as bias is selected in the mic sel menu.
Does this pin already have the coupling capacitor in line or do I need
I want to replace the element in a Kenwood MC-50 with an electret. I know
that the K3 provides bias voltage to pin 1 on the front mic connector which
is also the audio line - as long as bias is selected in the mic sel menu.
Does this pin already have the coupling capacitor in line
Yes.
73,
Doug, I guess you are seeing the Voltage drop on the power lead and it's
connectors. With my not so old Racal linear power supply, I obtained
the following results from the metering on the K3:
Zero out, 13.8V
5 Watts out, 13.5V
100 Watts out, 13.3V
This was checked into a 50 Ohm load on both 80m
Stewart,
You are correct that the importance of the offset is inversely
proportional to the filter width. A 50 Hz shift not make much
difference with the 2.7 or 2.8 kHz width, but it certainly will make a
big difference at a 200 Hz width.
73,
Don W3FPR
GW0ETF wrote:
I didn't bother about
Doug,
You are testing the regulation capability of your power supply.
I would say that is fairly normal - most of the drop will occur in the
initial part of the I-V output curve for the PS, then will flatten out
as the current becomes greater.
You are indicating a regulation of 3.7% over that
I've recently run a series of measurements comparing the commanded power
output with measured power output for my K3, using an HP437B/8482A power
meter.
The details are at
http://www.cliftonlaboratories.com/k3_power_setting_accuracy.htm
After updating my K3's firmware to the most recent beta
I'm not sure where you got the extra $1000 from.
Currently, HRO is selling the Quadra for $2999.
OK ... I had not priced the Quadra in some time. Last I looked
it was $3895 from most sources. In any case, $2999 is a coupon
price - HRO's regular price is $3499. If you want to compare
And it's connectors is quite true. I did some back of the envelope
calcs here and 60-75% of the voltage drop appears to be due to the
connectors + power supply sag.
This conclusion was drawn from a least squares linear fit of the V vs I
plot to obtain an effective R value. Then the cable
It's funny how experiences can differ. A couple years ago I decided to
refurbish my old Heathkit SB-200. Included in the project was a set of new
tubes to replace the original tubes from 1972. I purchased a pair of
Svetlana 572Bs from RF parts. One of them burned out its filament after it
was
Thanks Joe...
Actually, in a way, Elecraft KPA800 and 1500 and the Ameritron ALS1300
are in the same class...NOT YET AVAILABLE. :-)
de Doug KR2Q
On Sun, Dec 21, 2008 at 10:15 AM, Joe Subich, W4TV
li...@microham-usa.com wrote:
I'm not sure where you got the extra $1000 from.
Currently, HRO
The amplifier I was thinking of was the Metron! They seemed to be very well
made and almost indestructable from what I heard from the Texas bunch on 40
SSB way back.
- Original Message -
From: Sandy ebj...@charter.net
To: wrco...@flash.net; Elecraft Reflector
Looking for help. Not sure what I did...but I have
no audio for the paddle and the paddle is working as a straight key
but.I can see letters on the display. Any ideas?
Thanks for your help.
--
Frank KD8FIP
___
The K3 shows no reaction on changing the volume or rf-gain, but it shows
reaction on changing the bandwidth etc. I can hear a test signal from a
transmitter, with no antenna connected to the K3. The signal i hear does
not change when increasing power, no s-meter deflection. So i assume the
rx
Hi John, Phil and others,
. Maybe they'll be offered by Elecraft .
Elecraft does offer replacement screws, allthough not (yet) as a
complete set. Look on the Spare parts and Mod Kits order page under
Miscellaneous. You find FLTSCRKT with 10 screws for a dollar. It says
for K1 but they
You are testing the regulation capability of your power
supply.
Sorry, Don. Using the internal voltmeter in the K3 does not
test the regulation of the power supply. The pick-off point
for the voltmeter is after Q2 (FDS6375) the FET power switch
and D6 (SB530) reverse voltage protection
OK that could be done, I will experiment further when
I do get some time. I know I have checked the PS voltage
but dont remember what it was, have to go down into the
basement and check. Now checked, it´s 13.88 at 100W and
13.84V at 120W.
IMD comes up 8dB at 120W compared with 100W. Stays pritty
Yes, crowbar circuits disable the power supply, but some crowbar circuits
are self-resetting. They shut down the power supply only as long as the
over-current condition remains and automatically return power when it's
gone.
Some of the K3 owners here have run into that. Their K3 shut down
Just installed the KRX3 and I am getting PL2 error on the sub on 10 and 12
meters. I did the adc cal on pin 2 on acc jack. It measured 4.91 and I set the
config. parameter accordingly. I'll email Aptos and see what they say. It
works fine on other bands. Checked connections etc. to no avail.
I support the provision of more of the hardware off the shelf.
It is needed as Elecraft use such rare and difficult to obtain threads.
UNC/UNF is reasonable for a USA market, where they can probably be obtained
at any hardware shop. They are very difficult to get in small quantities if
you live
Fellow Elecrafters--
Ha! I finally did it -- I sent a message (replacement screws) to the
entire list rather than to the owner of the K3 I'm working on. So, now
the world knows my comments on screws.
Many thanks to Ron, PE8E, for letting me know about FLTSCRKT -- I'll
pick that up in my
Well, prompted by the interesting discourse here, I decided to ignore
my bulk and get on the floor to make some measurements at the PS
(RS35A).
K3 on Receive: 13.60 volts
K3 at 120 watts output: 13.59 volts
H.
Okay, so then did voltage (and amp) readings using the K3 itself.
Watts are also
Those numbers look similar to mine if you're testing on 40 meters, Doug.
The efficiency of the K3's transmitter varies from band to band, with (IMX)
40 meters having the best efficiency and so the lowest current drain vs. RF
output.
Ron
-Original Message-
Well, prompted by the
Found the problem.
Randy
K8RDD
- Original Message -
From: Randy Downs
To: Elecraft@mailman.qth.net
Sent: Sunday, December 21, 2008 1:45 PM
Subject: Err Pl2
Just installed the KRX3 and I am getting PL2 error on the sub on 10 and 12
meters. I did the adc cal on pin 2 on acc jack. It
K3 SSB Contour Filter
Recently I was reminiscing about Narrow Band Voice Modulation which
was developed in the late 1970s by Tom Lott VE2AGF and R.W.Harris,
WB6CZX. An important part of this system relies on the fact that between
the low frequency vowel sounds and the high frequency
I have found Excelite screwdrivers in general are good, and I have
also found good ones at Ace Hardware.
I like the German-made tools from Wiha and Wera. I ordered a set of Wiha
screwdrivers in a canvas pouch from chadstoolbox.com but they arrived
too late for the K3 build.
Interesting issue with the VFO A. I can't adjust the tension to the
way I like it. I installed it with the one nut to the inside and the
two nuts to the outside, the lucite cover on and then put the one
felt washer on before tightening it down.
The VFO feels loose to me with a small amnt. of
I have owned an ALS-600 for the last 5 years and have, for the most
part been quite happy with it. I did an expensive solution to the no QSK
problem by purchasing the Ameritron QSK-5; the pair work flawlessly
together with fast, thump free, full QSK.
My biggest complaint with the '600 is the
Okay, so then did voltage (and amp) readings using the K3
itself. Watts are also read from the K3.
Receive: 13.6 / 0.75
13.6 is a little low. I would touch up the trimmer on the
regulator to make the voltage 13.9 or 14.0 on receive. The
K3 and particularly any accessory connected to
I understand the 100w version has to watch its power level
when used in high duty cycle modes.
Does anyone know about the 10w version? I'll be doing
RTTY with my K3 at 5w. I assume that is low enough for
the 10w PA to get along fine, but I'd like to know for sure.
Couldn't find a mention in the
Posted again for those that might have missed the earlier listing: K2
with almost all options and/or KPA-100 + KAT-100 in EC-2 case for
sale.Available separately or as a complete station, additional
savings if you purchase all of it at one time.
Several additional K2 accessories
QROradio wrote:
All,
Given the nices specs I am considering to buy a K3 trx. (it's almost
X-mas anyway...)
With transverters this rig will also be used on EME.
I wonder how that will work with WSJT.
The K3 uses a digital IF, with A/D, DSP and D/A conversion.
How would that dual conversion
Hi
Not free - but supports: sub receiver, filters, menus, full display,
integrates rotator, SteppIR, DX-Cluster, Logbook, LP products
DX-Map, remote and much more.
www.trx-manager.com
Biased - an original user and beta tester, and Laurent made the
K3 work well with it - he has just ordered
Didn't they use something like this in the space programs?
David
G3UNA
K3 SSB Contour Filter
Recently I was reminiscing about Narrow Band Voice Modulation which
was developed in the late 1970s by Tom Lott VE2AGF and R.W.Harris,
WB6CZX. An important part of this system relies on the fact
Thought I found the problem. I had pulled the top off and found a tmp cable
resting on the toroid on the bottom of the 2nd synth board. It ran for several
hours with no problem after moving the cable. THEN I put the top back on. It
failed when the fp temp got to 37 deg c. If I leave the top off
Frank,
Did you perhaps plug the paddles into the KEY jack? That would make one
side of the paddles behave like a straight key.
As for the loss of sidetone, I don't know, but is there a chance that
you reduced the level of the Monitor? Hold the CMP/PWR/MON knob in
until you see MON n in
Randy Downs wrote:
Thought I found the problemTHEN I put the top back on. It failed
when the fp temp got to 37 deg c. If I leave the top off it won't
fail. The fp stays at 34 deg c. It's thermal whatever it is.
Randy,
Coincidentally, I just e-mailed you tentative instructions on how to
Before I start tearing things apart, and rewiring connectors I would like to
ask if anyone has found an easy way to get +5V from the ACC connector to use
for TX Inhibit on pin 7?
Searching the list archive I found that this question was asked before by N1EU:
Is there a convenient +5V source for
Well, I'll jump in here. I had the same problem a few months ago when I
assembled S/N 1889. The VFO A knob was way too loose no matter what I did. I
had followed the instructions and installed one (1) felt washer under both
the VFO A and B knobs. The B knob was fine. The A knob couldn't be
Hi Patrick,
Indeed there was a third felt washer with mine too. Presently I do
have it installed with the 2nd one in place. My knob wasn't loose
though, it was quite firmly attached once tightened. When I first
felt the knob rotate properly for say, 200 degrees of rotation then
bind a little
Good evening,
Happily there were a few folks I could hear. One for each net to be exact.
It got to the point where I checked the antenna a few times after I had already
checked if it had survived the storms. Yes, it is still there and there is not
much ice on it either. I also programmed
I was annoyed by the felt on felt hiss generated by rotation of VFO A and
took about six attempts to find a compromise between hiss and rotation
damping. Ideally I would prefer it to rotate less easily though.
-
Shane
K3/10: S/N 2127, KBPF3, KFL3B-FM, KFL3A-6K, KFL3A-2.8K, KFL3A-400,
First I don't have a K3 being only a lowly K2 owner. So I'm throwing
this out into the ring as a possible solution.
In the Elecraft spirit I modified it by changing to a larger knob that I
liked but was not happy with the tension.
The knob was also unbalanced and if it came to rest at a
Hi Kevin,
Remember that today was the solstice. The days will get longer now, keeping
20M open longer. When you first started to call at Z, you were readable,
but you dropped as the net time progressed. I copied you 339 deteriorating to
229 fairly quickly. I may have been stronger
Hi Gary,
Thanks for your interest. I am quite aware that the gurus at Elecraft
are extremely busy and need evidence that firmware changes are
beneficial. That is why I asked that those with the KRX3 should try my
method and report their findings.
This method is only good for evaluation but
Seasons Greetings one and all.:-)
The most intriguing thing about this thread is the deafening silence from
Aptos. As much as we (which I think numbers quite a few) wish they were
available, I think we have a long wait ahead before they appear.
I just can't get my head around Ameritron
David Woolley (E.L) wrote:
Jan Erik Holm wrote:
Please Elecraft, make a FW change and limit the radio
to 100W, thanks!
Human nature being what it is, the likely result of this would be a
large number of people refusing to upgrade their firmware any further
and a significant grapevine
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