Ok, some news to report!
First off, I checked all suggested solder points and basically reheated them
all just to be sure, although none really seemed suspect. Figured might as
well give them a once over. Started the radio up again and no change...was
about to sleep on it again, then figured it
Just a question, does the K3 really need a 10M preamp, I know it's as deaf as a
post on 6 but mine seems very lively on 10.
Best regards, Tim Hague
Skype m0afj.Tim
Sent on my iPad
On 26 Oct 2012, at 02:07, Gary K9GS garyk...@wi.rr.com wrote:
Boy...I was thinking of buying a PR-6 soon. I'd
Heinz Baertschi wrote
What is the availability date for the KXBC3 trickle charge mode
(automatically switch over to trickle charge when charging is completed)?
73, Heinz HB9BCB
Ray et al.,
Yes, this KXBC3 feature is neither implemented nor announced. It is a
standard feature of today's
Tim
I can address this a little comparing my FTDX-5000MP and my K3's the k3's
receivers are not up to the level of the Yaesu 5000 on the high bands. But
quite the other way around on the low bands in IMHO but 6/10m really needs a
good preamp for sure.
73,
Fred/N0AZZ
-Original Message-
Hello Elecrafters,
The pre-amp of KX3 in 6m can be set at 30dB. Would this mean that KX3 has a
better ear than K3 in 50Mhz?
Any ideas?
TNX 73,
Johnny VR2XMC
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Elecraft mailing list
Home:
Fred,
You must have an enviably quiet QTH (or a very poor antenna) if you find
that the K3 can benefit from a preamp on 10m. I work a lot of weak
signal CW on 10m with a simple Hex Beam up about 45 feet. Even with the
Hex Beam's low gain, I can see the noise floor drop by about 9 dBm when
I
To put the issue of need to bed some MDS meausrements with narrow
bandwidth CW would be useful.
Something that would be of more useful would be a fully integrated
internal unit that is assessable with a second click of the preamp button.
73 de Brian/K3KO
On 10/25/2012 20:59, Wayne Burdick
Jim AB3CV wrote
Appears to be bad BNC-BNC cable that was supplied with P3. Easy to
replace.
Yes, I just assembled my P3 a few weeks ago and noticed that the BNC cable
ends had a very loose fit on both the P3 and K3 BNC connectors. Although I
did not experience a problem, I replaced it with a
For many situations, no, the K3 does not need additional RF gain on 10
meters. However, in quiet locations additional gain is needed to pull weak
signals further above the noise floor for good copy. The PR10 takes the MDS
down to about -143 dBm and the addition of the internal pre-amp down to
Item 1 - LDG Tuner is SOLD
Item 2: Mantiz FX-2 Qrp Xcvr 30/40M $150 plus shipping - this a new unit in
original packaging and works great!
From makers Par EndFedZ Antenna
Size of a pack of playing cards(approx.)
Specs: http://www.lnrprecision.com/mantiz/ check out all the features in this
I didn't use mine either...seemed too cheaply made.
Sent from my iPad
Chuck, KE9UW
(Jack for BMW motorcycles)
On Oct 26, 2012, at 5:46 AM, N4OI - Ken ke...@roadrunner.com wrote:
Jim AB3CV wrote
Appears to be bad BNC-BNC cable that was supplied with P3. Easy to
replace.
Yes, I just
Ariel,
You may indeed have a problem with D9 and the 3 associated resistors in
the base K2, BUT when the KAT2 or the KPA100 is installed, that circuit
is ignored.
Both the KAT2 and the KPA100 contain a true wattmeter that is positioned
right at the output and used for power control.
The K2
Dale
Your missing the better receiver of the 5000 on 10m, and yes I live in the
country on a farm with 7 elements on 10m at 60'. My suggestion would be for
you to buy a 5000 and then you would hear the difference this is not a knee
jerk statement but one that was checked over many months with
I agree to the integrated internal unit being a better choice.
73,
Fred/N0AZZ
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian Alsop
Sent: Friday, October 26, 2012 5:17 AM
Cc: elecraft@mailman.qth.net
Subject: Re:
The resistance between Control Board U6 pin 40 and RF Board U1 pin 28
should be the sum of CB R6 and RF R64. Both should be 100 ohms (check
both). If the resistance between those two pins is less than the sum of
those resistors, you have a solder bridge somewhere.
73,
Don W3FPR
On
I recently bought an LDG AT600 Pro Automatic Tuner.
I seem to be able to get a low VSWR on 80 40 meters, but on 20, 15, 10
meters the best it will do is ~ 1.8:1.
My G5RV (It's really a Van Gordon 80 meter all bander fed with 450 ladder
line, 33 feet long, and then transitions to coax thru a
Fred,
Clearly, my QTH on the shore of Lake Erie about 15 miles East of
Cleveland, Ohio is not as quiet as yours. I don't doubt that the K3
could benefit from a preamp on 10 meters -- IF -- one lives in a quiet
enough location to be able to appreciate it. My location does not qualify.
I
Well...maybe the component sizes in the automatic LDG design are coarse enough
that your 1:1 values of components is not acheived.
Of course a manual tuner has infinite values of continuously variable capacitor
and inductor values. Thus it's easier to acheive 1:1.
But anyway, why worry about
I second the notion of a combined unit. My noise floor is low on 6m and 10m in
most directions (except when i aim my antennas (steppir three element and stack
of sevens for 6m) south towards Tijuana - i live four miles from the border)
nevertheless I would buy a combined unit in a nanosecond.
Don and Group,
Thanks very much for the responses. I will look at the schematic and determine
the associated resistors with D9 and replace it. I will also order KPA100 D16
and D17 diodes from Elecraft.
Ariel NY4G
Date: Fri, 26 Oct 2012 08:10:37 -0400
From: w3...@embarqmail.com
To:
I used a LDG tuner with a Carolina Windom. It tuned all bands 80-6 Meters
OK. Same antenna with My k1 k2 built in tuners works great 80-10 Meters.
73 George/W2BPI
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Elecraft mailing list
Home:
They are starting to show up over on the Yahoo Elecraft Forum.
http://groups.yahoo.com/group/Elecraft_K3/
-
Roger W5RDW
--
View this message in context:
http://elecraft.365791.n2.nabble.com/KAT500-User-reports-tp7564584p7564608.html
Sent from the Elecraft mailing list archive at
Why not just help the tuner out a little? Put some inductance in series with
the
center conductor and see if it likes that better. If that doesn't work put
some C
in series and adjust it. Or some C across the line. Or some L across the line.
Or some L in series and C across the line. You
Try an off-centre-fed dipole, you'll have lower swr at the antenna to start
with meaning less loss in your matching unit to get it to 50ohms. Running
modest power you can use coax and the right balun and choke at the feedpoint
if you can stand the weight up there. An inverted V configuration
Hi Elecraft,
When can we expect a new firmware for testing?
regards,
From: Wayne Burdick n...@elecraft.com
To: Gordan Hribar t93x_gor...@yahoo.com
Cc: Elecraft Reflector elecraft@mailman.qth.net
Sent: Friday, September 21, 2012 5:11 PM
Subject: Re:
Thanks for the reply Graham.
I did see your K3 website, I'm a 1 week old newbie here.
Yes I posted an incorrect IF.
I have only the main rx here and have since
found the specs for image rejection 70db 48-54 mhz
making my post for the most part unworthy of attention.
I'm having a great time with
Ron -
This is not an area where I have much experience, but with 450 ohm ladder
line I would have thought you would use something other than a 1:1 balun.
A few years ago I experimented briefly with an 80 meter dipole, fed with
450 ohm ladder line. I tried it with a 1:1 balun and with a 4:1
Ron ---
Does the tuner have a setting as to how low an SWR it should attempt to get?
Some say anything below 2:1 is fine. A trick I have found with some auto
tuners is to try tuning at different places in a given band. If you can get
a better match at some points, go back to where you want to
Ron,
The antenna you have is basically a good one. The problem you get
into is that it's really an 80 meter dipole being used on all bands.
This has been a popular configuration for many years. The issue is NOT
SWR. The issue is transmission line loss in a high SWR situation. To
avoid
I have 6 elements on 10, and the K3 s-meter rests at S-0. When I
turn the K3's preamp off, I can barely hear a change in antenna
noise.
Do you have a good choke at the Hex Beam feed point? If not,
maybe noise on the outside of your coax is going onto the
antenna.
Dave Hachadorian, K6LL
From a press release on the ALMA radio telescope.
http://www.wral.com/chile-s-alma-probes-for-origins-of-universe/11705356/
Each antenna is perched on a rotating steel pedestal with precisely
installed copper lining to protect from lightning. Each dish has a
sensitive receiver made of carbon
All,
There's a trick I learned from an antenna engineer acquaintance
recently for tuning 450 ohm feedline's with a 1:1 balun with 50 ohm
coax feeding the TX.
Here it is:
1. Assemble three RG11 coax lengths. One coax 6 feet 7 inches long,
one coax 6 feet long and one coax 9 feet long. From
I actually sent my rig back for this problem, but I didn't analyze
properly so it came back to me with no problem found. I now
understand where my distortion is coming from.
With compression above 30, I seem to be getting some RF feedback when
MIC+LIN is ON. When it is OFF, audio is clean.
Hi all
Just getting ready for CQWW, will be using Wintest for the first time and
scripts to used the K3’s DVR
Problem I have is that when calling CQ on VFO A using M1 repeat, the VFO B
frequency display is overwritten by the word REPEAT .. this for me is a
hindrance as I want to see the VFO B
What is the significance of using RG11 75 ohm coax vs 50 ohm? Sorry if this is
a dumb question.
Bob AF9W
On Oct 26, 2012, at 10:39 AM, N5GE wrote:
All,
There's a trick I learned from an antenna engineer acquaintance
recently for tuning 450 ohm feedline's with a 1:1 balun with 50 ohm
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Impedance matching. See
http://www.fourier-series.com/rf-concepts/smithchart.html May be
more than you wanted to know, but is easy to follow Smith Chart
Tutorials. And does explain why you might want to do this.
On 10/26/2012 01:23 PM, Bob Stephens
All other things being equal, 75-ohm cable has less loss per foot than
50-ohm cable. This assumes that the cables being compared have the same
diameter, length, operating frequency, etc. This is the primary reason
that cable TV systems, telco inside-plant cabling, and other similar
TJ Campie wrote:
A friend of mine is building his KX3 and noted that his BNC
connector had a little filter built on it - mine did not have that -
what is this for?
Hi TJ,
We decided to add a bit of supplemental low-pass filtering right at
the BNC jack, with a cutoff of about 60 MHz.
Sorry, meant to say 75-ohm, not 70-ohm in my previous post.
- Jim, KL7CC
On 10/26/2012 10:23 AM, Bob Stephens wrote:
What is the significance of using RG11 75 ohm coax vs 50 ohm? Sorry if this
is a dumb question.
Bob AF9W
On Oct 26, 2012, at 10:39 AM, N5GE wrote:
All,
There's a
ANy chance we can see the application note on this (second) K3 audio output
mod added to the web page soon? I like keeping my K3 up to date, and I have
some other updates to apply.
Thanks,
Bruce, N1RX
K3 #559
Back in August, Wayne posted the following:
Iain,
The mod you referenced
The significance of the 75 Ohm line is a matching section that
introduces a reciprocal impedance that brings the SWR to 1:1, or nearly
so. However, this approach does not address the balanced to unbalanced
issue. And, this is generally a one band match. A 1:1 choke type balun
will still be
I think the KX3 is a great little radio. I tend to loose it like my Mac Air.
It disappears under bags and cables etc.
My question to the list. I am looking for a good active or powered speaker
to use with it.
Something that I could use in the shack or portable to give me more hi fi
and wattage
Don - Appears problem solved. Pin 4 of the encoder measured open to ground.
I messed around for an hour trying to figure out why. I finally found the wire
from the circuit board to the encoder termal #4 broken. I used trimmed
component leads to make the four connections as called out in
Hi-
I have my Elecraft P3 for swap. I'd like to acquire a K2 which I think I will
get more use from than the P3. My operating doesn't include and contests or SSB
so many of the P3 features are lost on me.
73 de Dave, K1OPQ
__
N4OI - Ken wrote:
Appears to be bad BNC-BNC cable that was supplied with P3. Easy to
replace.
Yes, I just assembled my P3 a few weeks ago and noticed that the BNC
cable ends had a very loose fit on both the P3 and K3 BNC connectors.
Although I did not experience a problem, I replaced it with
The knurled thumb screws on my KXPD3 were hard to turn. One was OK but
the other was misaligned. I thought it might be that the alignment of
the screws might be out of tolerance or something. However, when
checking how they lined up without the paddle's PC board in place, the
screws fit perfectly
David,
I have seen several responses that suggest changes to your antenna
setup, but not one that I can warm up to.
The choice of a 1:1 balun vs. a 4:1 balun depends on the feedpoint
impedance and has nothing to do with the fact that the characteristic
impedance of the ladder line is 450 ohms
Cecil,
That is great news. Enjoy the rest of the build.
73,
Don W3FPR
On 10/26/2012 3:57 PM, Cecil Turquette wrote:
Don - Appears problem solved. Pin 4 of the encoder measured open to
ground. I messed around for an hour trying to figure out why. I finally
found the wire from the
Ok that's what I'd thought about the resistance value there - the note (on
Info 080 troubleshooting, in builder resources) had said that the resistors
should be 470 ohm, and that the range should be 900-1000 ohm. However all
through the manual those resistors are referred to as 100 ohm, which is
Got the KAT500 this evening and it took about 15 minutes to get the book read
and the required cables connected. I did cheat a bit and had the short RF
cable made up to go between the KPA500 output and the tuner's input. I also
had the 15 pin aux cable made up to go from the KAT500 to the
The KX3 arrived many weeks ago and just haven't had the time to get it
assembled and on the air. I found time at last yesterday and it went
together in no time. Very, very easy to assemble.
Once I got it on the air the receiver sounded great and all the controls
made sense and seemed to work
OK, the resistors were changed from 470 ohms to 100 ohma with the A to B
changes (SN 3000), so your measurements are correct.
Give us some more detail about the VFO knob problem and we may be able
to help.
As I indicated for another ham having VFO knob problems, look at the
Front Panel board
w0eb/Jim:
Do you think the KAT500 lends itself to remote operation, in a weatherproof
housing, several hundred feet from the shack?That's what I'm looking to doCiao
de Bill-w7kxb . .
From: w...@cox.net
To: elecraft@mailman.qth.net
Date: Fri, 26 Oct 2012 20:23:02 -0500
Subject: [Elecraft]
It's possible this is a firmware issue. I have a new field-test
release I'll send you.
73,
Wayne
N6KR
On Oct 26, 2012, at 7:06 PM, Doug Person wrote:
The KX3 arrived many weeks ago and just haven't had the time to get it
assembled and on the air. I found time at last yesterday and it went
Do you have the KXFL3 installed? If so, try reseating it.
matt W6NIA
On Fri, 26 Oct 2012 20:06:29 -0600, you wrote:
The KX3 arrived many weeks ago and just haven't had the time to get it
assembled and on the air. I found time at last yesterday and it went
together in no time. Very, very
I ran into something similar when I first fired up my KX3. I realized I was
listening to the wrong side of the zero beat, where I could just barely
hear the signal - then tuned up a bit and realized it was the same signal
but this time much stronger. (I haven't run into this since.)
--Andrew,
Same here, I have a 6/6 Yagi stack on 10 and get more or less
the same reaction.
A built in preamp for 6 and 10m would have been super. As
soon as I get some time I will make one.
/SM2EKM
--
On 2012-10-26 18:02, Dave Hachadorian wrote:
I have 6 elements on 10, and the K3
Hi Doug,
I assume you don't have the KXFL3 roofing filter installed. I had the same
issue. Make sure that in the MENU -- temporally turn on TECH MD [ON] , then
select Rx xFIL and then set it to [not inSt]. I think you will find the
setting in [norm].
This should fix that issue.
73,
Jim Sheldon w...@cox.net wrote:
Since I don't have a hand key connected to the K3, I put it in data
mode and hit the XMIT button to produce a carrier for tune. It
Any particular reason for not using the TUNE function with this setup?
--
Pierfrancesco Caci
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