RDE is somewhat more descriptive of what actually happened than
"Anomaly" or "Mishap". Mishap could describe the pilot falling off the
ladder while boarding his A/C as well as crashing onto the deck of the
aircraft carrier ... which generally makes you very unpopular with the
Sailors and the C
Is that like the "Rapid Disassembly Event" that happens during rocket
launches now and then?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 11/7/20 11:50 AM, Fred Jensen wrote:
"Ano
In the software world these days we call them “undocumented features”.
Or, the issue is in the documentation… ;-)
73!
Jack, W6FB
> On Nov 7, 2020, at 11:50 AM, Fred Jensen wrote:
>
> "Anomaly" is [or at least was during Apollo] NASA's universal term for
> anything that was unexpected ... fro
"Anomaly" is [or at least was during Apollo] NASA's universal term for
anything that was unexpected ... from an intermittent pilot light to the
rocket landing pointy end down in the desert outside Tucson. The
equivalent USAF term is "mishap" which can range from a faulty drag
chute to landing
ovember 7, 2020 07:50
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Tuner bug
>
> My top band antenna is an OCF wire running round my back yard wall at about 5
> ft above ground. It has been through a number of iterations to make it
> tunable on 160 and to handle 500 W.
2020 10:58
> To: James Driskell
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] Tuner bug
>
> I think the term predates computers, but I have heard the story.
>
> https://www.atlasobscura.com/places/grace-hoppers-bug
>
> 73 de Dick, K6KR
>
> > On Nov 7,
2020 07:50
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Tuner bug
>
> My top band antenna is an OCF wire running round my back yard wall at about 5
> ft above ground. It has been through a number of iterations to make it
> tunable on 160 and to handle 500 W.
>
>
ndy Durbin
Sent: Saturday, November 7, 2020 07:50
To: elecraft@mailman.qth.net
Subject: [Elecraft] Tuner bug
My top band antenna is an OCF wire running round my back yard wall at about 5
ft above ground. It has been through a number of iterations to make it tunable
on 160 and to handle 500
Andy,
You have far too much time on your hands... :)
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 11/7/20 8:28 AM, Andy Durbin wrote:
"Careful inspection of the air-spaced varia
Opportunity looms - RF carpet cleaners!
Mike, N8TTR
> On Nov 7, 2020, at 11:28 AM, Andy Durbin wrote:
>
> "Careful inspection of the air-spaced variable revealed a small bug between
> the plates. It was carefully extracted and viewed under the microscope. It
> was well charred!"
>
> F
"Careful inspection of the air-spaced variable revealed a small bug between the
plates. It was carefully extracted and viewed under the microscope. It was
well charred!"
For the detail oriented - bug was identified as attagenus pellio (carpet
beetle). They are common here in Arizona. They h
My top band antenna is an OCF wire running round my back yard wall at about 5
ft above ground. It has been through a number of iterations to make it tunable
on 160 and to handle 500 W.
500 W capability was achieved with a home brew feed point L match consisting of
a large air-spaced variable c
Hi Bob;
Thanks a lot! An automatic tuner also was my first idea and I hope, I'll catch
up here still some motorboat experience form usage of external tuners for this
purpose.
73, Peter
-Ursprüngliche Nachricht-
Von: ROBT E WOODWARD JR [mailto:bobwoodw...@mac.com]
Gesendet: Dienstag, 9.
-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on
behalf of Michael K Bottles [k...@icloud.com]
Sent: Wednesday, May 23, 2018 10:49 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Tuner ranges
Is the tuner range of the K-3 and the KAT-500 the same?
They seem to tune the same antenna
I believe that the K3 tuner does have more range than the one in the KAT500.
My experience with this kind of system (tuner -> balun -> open wire
line) is that the 1:1 balun works much better from the point of view of
losses and choking off RF in the shack.
What do you mean that the 4:1 balun
Is the tuner range of the K-3 and the KAT-500 the same?
They seem to tune the same antenna differently, (of course the K-3 is tuning
through a bit more coax with both the KAT-500 and KPA-500 on standby.)
They are tuning a 250’ Doublet via a short coax run (10’) to an external 4:1
current Balun, t
Hi Jim,
Thanks for the info... I will be getting an amp from Elecraft if they
ever come out with a 1K job, and buy the tuner then... THANK YOU!
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
Hi Phil,
I will be using a vertical, and I have decided to get the LDG... Thanks
for the thought sir!!!
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://g
On Mon,11/17/2014 6:14 AM, David Cole wrote:
Hi all,
I am considering the Elecraft KAT500K tuner for my station... I run
around 1K to 1.5K for SSB, and 500 to 750 for RTTY/Digital.
Is this pushing the Elecraft too far?
I'm using a pair in my SO2R station that I run legal limit. My antennas
What antenna will you be using, David?
Phil W7OX
On 11/17/14 6:14 AM, David Cole wrote:
Hi all,
I am considering the Elecraft KAT500K tuner for my station... I run
around 1K to 1.5K for SSB, and 500 to 750 for RTTY/Digital.
Is this pushing the Elecraft too far?
I am looking at an LDG AT-100
David,
It all depends on the SWR the tuner has to handle rather than the mode.
If you look at the specifications you will find that the KAT500 will
handle 1000 watts over a 3:1 SWR range (600 watts over a 10:1 SWR range)
- and that is from 3 to 30 MHz. At the 1.8 to 2 MHz frequency range,
t
Hi all,
I am considering the Elecraft KAT500K tuner for my station... I run
around 1K to 1.5K for SSB, and 500 to 750 for RTTY/Digital.
Is this pushing the Elecraft too far?
I am looking at an LDG AT-1000 PROII, and the Elecraft KAT500K right now
as the two possible candidates. Palstar would b
On 2/11/2014 9:47 AM, Jobst Vandrey wrote:
I have lots of data in the loss to be expected in Coax or Open wire when
running at higher SWR into a multiband antenna - however, I do NOT have
any real world data on the losses to be expected in a tuner system at
higher SWR.
Obtain some sheet syrofo
You would need to know the unloaded Q of the capacitor(s) and Inductor(s) in the
circuit when a match is obtained and the complex impedance (not the SWR) of the
load to calculate the total loss. More than likely, it will be highly frequency
dependent.
N7WS.
On 2/11/2014 10:47 AM, Jobst Vand
net
Subject: Re: [Elecraft] Tuner Loss question
Sorry, but the chart is showing mismatch loss. When we use a tuner, we
don't suffer mismatch loss; we suffer tuner losses, which despite the
claim(s), can be appreciable.
N7WS
On 2/11/2014 2:36 PM, tom armour wrote:
> Why do you need to kno
Check out the ARRL antenna tuner reviews. They all have loss measurements at
up to 10:1 SWR for resistive loads. There are two Elecraft ARRL tuner reviews:
KAT100 and KAT500.
Phil – AD5X
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meter both in
front and behind the tuner and see what kind of loss you are getting.
Yes the tuner will have loss, but relatively negligible.
73 - Tom - wa4ta
Date: Tue, 11 Feb 2014 11:47:19 -0600
From: jvand...@gmail.com
To: elecraft@mailman.qth.net
Subject: [Elecraft] Tuner Loss question
I have
jvand...@gmail.com
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Tuner Loss question
>
> I have lots of data in the loss to be expected in Coax or Open wire when
> running at higher SWR into a multiband antenna - however, I do NOT have
> any real world data on the losses to be expec
I have lots of data in the loss to be expected in Coax or Open wire when
running at higher SWR into a multiband antenna - however, I do NOT have
any real world data on the losses to be expected in a tuner system at
higher SWR.
So:
Are there any numbers available on what additional losses my Elec
John,
That sounds equally good.
Let's hope somebody at Elecraft picks this up. It will smoothen the
operation of the K3-line still more.
BTW, I had the K3-KPA500 combo with me on the TN2MS DXpedition in
October. Without the KAT500 ( not need for it there). That was smooth
operation from C
I have a slightly different idea about how I would like it setup: I
would like the K3 to be configured for either the Internal or External
tuner (or none). When you press the ATU Tune button on the K3, it tunes
whichever one it is configured for (and puts the KPA 500 in bypass).
- 73, John, N0
Wonderful idea Arnie; especially if you want the "2nd" tune.
73 George AI4VZ
--
From: "Arie Kleingeld PA3A"
It would be a nice feature that when I press the tune button on the
KAT500, it would key the K3 at the same time and put theKPA500 in
stand
William,
I know exactly what you mean.
It would be a nice feature that when I press the tune button on the
KAT500, it would key the K3 at the same time and put theKPA500 in
standby (if you have one).
Elecraft shines in clever layed out equipment and firmware. This would
be a logical feature
One thing that stumped me and cause me all kinds of grief was what button I
was pushing.
Reminder to those who may not know. The Internal K3 tuner runs when you
press ATU TUNE
The external KAT500 tunes when you push and hold the XMT button.
If you tune internally the external KAT will show all ki
Hi John,
I was looking for a tuner that could be adapted for use at the
antenna end. Recently I purchased an LDG Z-11ProII, but I haven't tried
it yet. There is information on the LDG website on a modification to
install an internal battery pack for remote use. After it arrived I
opened i
I have the K2 ATU fitted. At the time I suffered from a lot of unwanted output
signal. As a result the ATU jitters about before findin the tune spot. I bought
an Orion and its ATU which had similar problems as above. I moved the shack
so that the end of the dipole points directly to it. I also
I have an AT100pro that I use with the K2/100 and has been trouble free. It
has dual range watt meter and displays SWR. It tunes my G5RV without issues.
Ariel NY4G
Sent from my iPhone
On Feb 18, 2012, at 6:14 PM, "Joel Black" wrote:
> My trusty LDG Z-100+ tuner died last night. Luckily, it
The KAT3 is an excellent internal tuner and if you don't plan on ever having
an amp why not get one? If not there are a lot of good tuners out there. I
would look for an L network tuner as they are more efficient and more broad
banded than the differential T units out there. For high power work
I used the original AT-100Pro with my FT-857D for several years and
really liked it. For me, it did an admirable job. I don't have any
experience with the other two tuners. In fact, my K3 (#281) has the
KAT3 internal tuner. One push tuning and I'm done. No power
adjustments to remember, an
Sorry, I forgot to sign the previous...
Joel - W4JBB
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My trusty LDG Z-100+ tuner died last night. Luckily, it is one month
before the end of the two-year warranty so I will be sending it back for
repair. In the mean time, I am without a tuner. I do not know when (if
ever) I'd buy an amp, so I do not need a high-power tuner. I will be
using the
The tuner has been sold.
N5SM
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If I may offer something else to extend the range of any tuner - add a
capacitor or an inductor to the output of the tuner (or at the output of a
balun) for those bands the tuner has trouble matching. The idea is to
cancel (or reduce) the reactive component of the feedline impedance and it
may bri
Craig
I have a K1 and K2, both with the auto tuner options. The K2 will almost
tune "anything", well at least anything that looks remotely like an
antenna. It compares well with an MFJ-993 auto ATU that I also have.
While the KAT1 is adequate for end fed wire antennas on the lower bands
and d
I'm presently using a K2 with the internal ATU unit. I'm quite pleased with
both.
I will be getting another Elecraft for portable use this summer, either a K1
or a KX1. One consideration is the autotuner performance. Can someone who
has experience with them provide some practical comparison bet
Don,
Okay, that's as I suspected. It makes sense to me that the tuner could
resonate the antenna-feedline system, but that the currents may remain
unbalanced. One of my antennas is a quad fed with open line, and such
operation would probably skew the directivity. I think I'll stick with my
balu
her 4:1 or 1:1. I recall emails to
this reflector in the past describing connection of ladder line straight
to
an Elecraft tuner with no problems. I'm now wondering if I could ditch
the
baluns in my installation. Any thoughts/experience with this? Is the
output from a tuner balanced at the coa
emails to
this reflector in the past describing connection of ladder line straight to
an Elecraft tuner with no problems. I'm now wondering if I could ditch the
baluns in my installation. Any thoughts/experience with this? Is the
output from a tuner balanced at the coax connector up until
27;t effect the higher bands
too much.
73 Fraser G4BJM #4368
From: "Bill Strong" <[EMAIL PROTECTED]>
To:
Subject: Re: [Elecraft] Tuner losses
Date: Fri, 20 May 2005 23:09:13 -
Andy,
I want to give you a follow-up. I built the KAT100 in less than three
evenings and i
Cc: Don; Parker Buckley; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Tuner efficiency question
On May 13, 2005, at 12:40 AM, John, KI6WX wrote:
> At high power, an inefficient tuner can generate significant
> amounts of heat, which can destroy components. A 1kW transmitter
> in
On May 13, 2005, at 9:32 AM, Stephen W. Kercel wrote:
Comment on baluns: If you drive a ferrite core to saturation, it
will overheat.
True.
Once the core overheats, the inductance changes and you lose your
match (quite severely, in my experience).
In order to change the inductance perma
On May 13, 2005, at 12:40 AM, John, KI6WX wrote:
At high power, an inefficient tuner can generate significant
amounts of heat, which can destroy components. A 1kW transmitter
into a 70% efficient tuner will generate 300 watts of heat in the
tuner.
This is why I tend to disbelieve tuner
Andy,
I want to give you a follow-up. I built the KAT100 in less than three
evenings and it is a wonder to me in both its design and operation.
I built the BL1 in the 4:1 configuration. I get a 1.1:1 or less match on
all bands except 15 Meters which is about 1.5:1. I find that the balun
gets hot
uot; <[EMAIL PROTECTED]>;
Sent: Sunday, May 15, 2005 6:57 AM
Subject: Re: [Elecraft] Tuner losses
Andrew,
I beg to differ that the LDG: 4:1 balun and the Elecraft 4:1 balun are
similar, or even close. The LDG 4:1 balun is a voltage balun. I don't
have one, but I have its schem
73,
Andy
- Original Message -
From: "Bill Strong" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, May 14, 2005 9:50 AM
Subject: Re: [Elecraft] Tuner losses
Hi Andy,
I tried to post the message below after reading your very interesting
comments. I do
In a message dated 5/13/05 12:51:01 PM Eastern Daylight Time, [EMAIL PROTECTED]
writes:
> Many QRP operators assume that a tuner used for QRP can
> be small because one doesn't need the power-handling capability of a larger
> tuner. However, if a tuner has x db loss, then that loss will reduc
ine and 1:1 balun on the output
of the K2. This is antenna is used on 40 through
10 meters and has won me thousands of QSO's.
There I have measured current at the base of the
vertical radiator. The Elecraft tuner beat my manual
300 watt MFJ tuner feeding the antenna directly at the base.
It al
I like the "QRP Balanced Antenna Tuner" rated at only 500W.
Eric
KE6US
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Jim W7RY
Sent: Friday, May 13, 2005 4:32 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Tuner efficiency que
There is a fellow here in the NW that builds link coupled tuners. Pat
Buller, W7RQT.
They are quite well made and look great. His email is shown on www.qrz.com
73
Jim W7RY
ConAt 09:30 AM 5/13/2005, [EMAIL PROTECTED] wrote:
> ...
> Contrary to popular belief, balun loss is not the largest
>
Wow... This chap has quite a setup! And he's very talented! Take a look at
some of those construction projects!
Very nice indeed!
73
Jim W7RY
At 01:21 PM 5/13/2005, Stephen W. Kercel wrote:
Stuart
It was a year or two back that I saw them. It may well be the case that
they are discontinued.
Stuart:
The Johnson differs from modern balanced tuners in that it used link
coupling (a tuned transformer with inductive coupling) rather than a
matching network.
It also had the advantage over home brew link couplers that you tuned it
with knobs instead of moving little clips around on the
Stuart
It was a year or two back that I saw them. It may well be the case that
they are discontinued. They were way out of the price range of the typical ham.
However, these Web pages still work.
http://www.hewezi.com/bal_tuner.html
http://www.dj2hz.de/
If you're really curious, get in touc
You are correct, Stuart. But, while lacking 160m, it did cover 80 to 10m.
Okay, so the bandswitch was discrete in the bands available at the time, but it
I have used it on the other bands we have now and it still worked there, at
least with my 340' double extended Zepp. I didn't measure the e
The MFJ balanced tuner has a double tee network to give the most range of
adjustment.
Note even the vaunted Johnson Matchbox did not cover all of today's bands
and impedances.
-Stuart
K5KVH
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My understanding, from L. B. Cebik, was the German balanced tuners were
discontinued. I could not find them by Google search.
-Stuart
K5KVH
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Subsc
Google the name Frank Witt, and you will find the tuner studies he did.
Also in archives of QRP-L reflector where he posted them, and maybe on
www.arrl.org technical topics links.
72,
Stuart
K5KVH
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>> Is there a modern tuner out there for balanced lines that
>> doesn't use a balun?
>I don't know of any. There is nothing wrong with using a balun
>as long as the balun is looking into a relatively low SWR .
Even the MFJ-974, 974H, and 976 balanced line tuners use a 1:1 current balun
on the i
[EMAIL PROTECTED] wrote:
Yes, we most certainly do. Too many of us care only about the automatic
aspect of these compact tuners, and we give up really efficient tuner
operation. Tuners have to be really large to be really good. The components
have to be large and the enclosures have to be large.
I haven't had lots of different tuners to compare myself, but I do have
a Johnson KW Matchbox tuner. It does a great job on Balanced lines. I
didn't really know about the Palastar but just checked it out on the
website. Looked like an interesting tuner. But to me the downside of it
was th
> ...
> Contrary to popular belief, balun loss is not the largest
> contributing factor, and if properly designed, makes
> little difference whether it is placed on the input or the
> output. Charles Green W1CG has done a lot of work
> on balun loss and reports that the loss is actually
> quit
Dave:
Personally, I've always thought that balanced was cool. I was using
balanced lines 20+ years ago. The sense that I had from my fellow hams at
the time was that practically everybody else thought that they were
decidedly uncool.
It is only in the last year or so that I've noticed them b
Side note: I dimly recall that there is an outfit in Germany that has
been making balanced tuners since before balanced became cool.
Balanced didn't become cool; balanced always was cool. Balanced is
only being rediscovered by the generation (or two (or three)) that
thought that coax was the
The comparison of balanced tuners is in the September 2004 QST.
It is worth mentioning that there is a strong correlation between tuner
efficiency and money. According to the ARRL lab data, a $900 Palstar is
substantially more efficient (Surprised?) than a $200 MFJ.
Side note: I dimly recall
Folks,
I recall comparisons and analysis of different tuner types done several
years ago by ARRL. The conclusion was that the inductor Q was the major
determining factor for tuner efficiency of any one type of tuner. The T
match circuit can match a large range but at some settings can produce hi
Hi guys. I certainly appreciate your quick responses. Like everything
else, I guess the answer to a certain extent is "It depends". I probably
should have sidestepped the balanced tuner vs tuner/balun part of the
question. I've tried all kinds of combinations along those lines, probably
guided
Palstar BT1500A is fully balanced tuner with
balun in INPUT, and tuning elements work balanced.
Here balun works properly.
The same applies to e.g. MFJ976.
World seems to wake up again for lattice feeders.
Most welcome.
--
Benny AUMALA OH9NB
I haven't had lots of different tuners to compare myself, but I do have
a Johnson KW Matchbox tuner. It does a great job on Balanced lines. I
didn't really know about the Palastar but just checked it out on the
website. Looked like an interesting tuner. But to me the downside of
it was that
Parker & Don;
I haven't tried to measure the efficiency of the Elecraft tuners. It is a
fairly difficult measurement to make correctly when the input and output
impedance are significantly different. However, there are two effects to
consider in tuner efficiency.
At high power, an inefficie
Parker et al,
QST did a review and test of a bunch of balanced tuners a year or so back.
I don't remember too much of it now but remember being shocked at how high
the losses typically were. As I recall efficiency ran in the 65 to 75
percent range for many of them. The Johnson matchbox was t
I've been using my QRP K2 for the last 2-3 years with a "full sized" Palstar
tuner. I use a variety of antennas from 160 to 10 meters, fed with coax,
ladder line, choke baluns, the Elecraft balun, etc. I'm thinking about
going to an auto tuner (Dayton Hamvention coming). Has anyone compared the
80 matches
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