Don wrote:
I have found that it is not as easy as I had imagined. I have been
using several methods to automatically find minimum swr and some work
pretty well most of the time but none work well *all* of the time. The
problem is that on some bands minimum swr occurs over a very narrow
On Sep 13, 2005, at 11:08 PM, Vic K2VCO wrote:
I bet Wayne knows a good algorithm!
Indeed I do. And it took several weeks of serious R D and coding the
first time we developed an ATU (KAT2).
Among other things, the code uses four tuning phases, each with
different granularities;
wayne burdick wrote:
It was a wonderful, hair-pulling, sleep-depriving, learning experience
that I wouldn't deny anyone by giving away the details ;)
Wayne, you're a sick, sick man... but we love you! :-)
--
Nosey Nick Waterman, Senior Sysadmin.
#include stddisclaimer[EMAIL PROTECTED]
I have not looked at the code myself but this might (?) help:
http://fermi.la.asu.edu/w9cf/tuner/tunersrc.zip
You can try the applet at
http://fermi.la.asu.edu/w9cf/tuner/tuner.html
vy 73 de toby
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Stephen Kercel's suggestion to use a Genetic Algoirthm is brilliant ...
this sounds like a perfect application for these astounding and amazing
techniques. I have had two passions in my life (at least, PG-rated) ...
ham radio and genetic algorithms ... own every book ever written on GA's
as well
As much as GAs are fun and very powerful, I do wonder about the amount
of time it might need using say a population of 50 and 100
generations. Assuming 100ms for switching and mesurement - 100ms * 50
* 100 = 8Min 20Sec.
Not to mention the amount of memory needed. Most controllers do not
--- Don [EMAIL PROTECTED] wrote:
At the moment, though, I am having trouble coming up with a software
algorithm that finds minimum swr and this message is a request for
suggestions.
Any ideas?
Hi Don.
Most tuners contain directional couplers to indicate VSWR, but they
are often
Toby:
Good point.
73,
Steve
AA4AK
At 04:10 PM 9/14/2005 +0200, Toby Deinhardt wrote:
As much as GAs are fun and very powerful, I do wonder about the amount of
time it might need using say a population of 50 and 100 generations.
Assuming 100ms for switching and mesurement - 100ms * 50 * 100
Interesting idea, but it has problems. Directional couplers are
designed around a known set of values for its components, minimizing
the number of variables in the circuit. One of the things that is
normally fixed is the load impedance which the coupler sees.
Accuracy of the measurements
Don Brown KD5NDB posted (2002) an interesting proposal to install a MFJ-4125
power supply into an EC-2 Case. Has any one attempted this project?
KI4DGH
Chuck G.
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Wow! I have received a lot of responses and there are some very
interesting and valuable ideas in them.
Wayne's response to the list gets the prize for smoke, mirrors, and just
plain fun (how much of that is smoke we will never know). His message set a
new high for the ratio of reading
I have built 100+ K2's. Let me build one for you. My prices are reasonable
and you have a K2 ready to have fun with.
Alan
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Eric, KE6US, took a great night-time photo of his K1 with the new
backlight installed. He was kind enough to let us post the photo on our
site. See:
http://www.elecraft.com/K1/K1_backlight_detail.jpg
I believe Eric used the 10 mA option, given the brightness. 6 mA is
just a bit dimmer,
Hi Folks,
I just ordered some Multicore solder M00979 .020 63/37 370 Flux. It used
to be Ersin Multicore, but now is owned by Heakel-Loctite.
I bought 20 rolls, and will have 15 or 16 to offer to folks here on the
reflector if you would like to stock up. The industry is moving rapidly to
wayne burdick wrote:
Eric, KE6US, took a great night-time photo of his K1 with the new
backlight installed. He was kind enough to let us post the photo on our
site.
wow!
That looks really cool!
I wonder what the increase in current draw is?
Ron wb1hga
Joseph:
Genetic Algorithms would be an extremely inefficient method for
solving such a problem where the objective value is so easily measured
and the direct effects of the arguments of the objective function
(capacitance and inductance) are so easily determined. Wayne's
solution is
I think I've seen this before.maybe a few times
At 03:35 PM 9/14/2005, Alan wrote:
I have built 100+ K2's. Let me build one for you. My prices are
reasonable and you have a K2 ready to have fun with.
Alan
It sounds like Alan is going through SERIOUS 'kit building
Sorry folks, but within less than an hour, I have received 14 requests, and
several are for multiple rolls - so they are all spoken for.
If I have any more requests, they will have to go on a wait list in case one
or more folks who said they wanted a roll back out later.
73,
Don W3FPR
--
No
At least one less than his desired number ...
Go ahead and brag, just HOW many is it by now ?
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I would not let him build one because he begs entirely to much makes me
wonder what he is up to.
Subject: Re: [Elecraft] Let me build your K2
At least one less than his desired number ...
Go ahead and brag, just HOW many is it by now ?
see ya
73's
N1IB
David Schornak
K2/QRO 03027
Is it possible to modify the VOX sensitivity (or reduce the ALC action) so that
an operator using PSK31 could run without a PTT relay, relying upon the VOX
alone - and yet, not having enough input to have the ALC kick in?
I'm looking at the KSB2 schematic as I write, and it looks like the VOX and
Are there any plans for Elecraft to produce 432MHz or 1296MHz
transverters? These would be a very nice addition to the growing family
of Elecraft kits.
Also, does anyone know of Elecraft-quality 432MHz and 1296MHz power
amps? The only thing I've found so far are homebrew stuff and nothing
that
Google (and Elecraft) has answered my question...
http://www.elecraft.com/Apps/PSK31_KSB2_mods.htm
Time to start fiddling around...
73,
Daniel AA0NI
Oklahoma City
K2 #3421
--- Daniel Reynolds [EMAIL PROTECTED] wrote:
Is it possible to modify the VOX sensitivity (or reduce the ALC action) so
Can anyone suggest a source for braided ground straps, preferably
longer than 12 inches? I need a handful of them, around 2 feet each.
--Andrew, NV1B
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On 9/14/05, Lanier, Robert [EMAIL PROTECTED] wrote:
Also, does anyone know of Elecraft-quality 432MHz and 1296MHz power
amps? The only thing I've found so far are homebrew stuff and nothing
that comes in a kit. If I've missed something, please let me know.
Down East Microwave
Has there been any decision made whether to make a backlit LCD standard on
the K1?
Or will one have to order the K1 Kit, and the backlight mod and thereby
end up paying for an extra LCD?
-Bruce, N1RX
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My local Ham Radio Outlet, Sunnyvale, CA has a
large selection of them.
Doug
W6JD
-Original Message-
From: Andrew Moore [EMAIL PROTECTED]
To: elecraft@mailman.qth.net elecraft@mailman.qth.net
Date: Wednesday, September 14, 2005 1:21 PM
Subject: [Elecraft] OT: source for braided ground
I measured 58 ma before and 68 ma after with the 200 ohm resistor. This
agrees with what Elecraft is saying. I didn't try the 330 ohm resistor, but
Wayne says about 6 ma. I was satisfied with the output at 10ma and saving
4ma isn't significant to me since the K1 is usually connected to a 7aH
W3FPR - Don Wilhelm wrote:
Sorry folks, but within less than an hour, I have received 14 requests, and
several are for multiple rolls - so they are all spoken for.
I thought it was just an EU thing, didn't realise lead was going out of
fashion your side of the pond too.
I was going to ask,
hello all,
You can go to ARRL.org web site and download lists of nets by area, freq.,
mode, etc.
73,
Stuart
K5KVH
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Howdy All,
Just ordered my K2 after a couple of years deliberation.
Deciding factor was Kevin's account of listening to CW while working through
maths derivations. Four years ago I enrolled (part time) in a science degree
to learn maths and am having a wonderful time.
The discussion of auto
Some of us in US are getting any remaining stocks of genuine lead solders
from Multicore (former Ersin).
They have been bought by another us co. but a google search of Multicore
Solders should give you their web site, and their dealers. Some dealers
will have NOS for awhile. I have a couple
On Wed, 14 Sep 2005, David wrote:
I would not let him build one because he begs entirely to much makes me
wonder what he is up to.
Maybe he likes to build K2s?
Maybe enough folks like his work that he is proud to offer the service?
For what it's worth, when I was looking for a builder since
I know the K1 comes with a standard tuning range choice of 2 (80k or 150k).
But I was wondering if it were possible to do something like 100k. I ask
because there is almost a concensus that the 150k tuning range is too fast, so
I would like to avoid this. But I would also like access to
Mirage makes a 432 amp. I believe TE Systems does as well. Tokyo
Hi-Power makes amps for 432 (I believe) and RF Concepts.
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lanier, Robert
Sent: Wednesday,
make a backlit LCD standard on the K1?
The lack of a lit display had been my chief K1 nit to pick. I'd recommend it
be made standard.
Scott N1AIA
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I would not let him build one because he begs entirely to much makes me
wonder what he is up to.
I joined the list about eight months ago and he was advertising 90+ at that
time so he's not wanting for work.
Whether the messages are posted too frequently or not is up to Eric to
decide. This is
Craig, NC0R, wrote:
I've purchased the Rework Eliminator modules and the customized bezels and
nameplates that are advertised here from time to time. I think I've seen
mention of people offering torroid winding services. It's probably one of
those things where when you like the product being
Got mine installed today. It works great. Nice green light
behind the LCD.
Much better than my jury rigged white LEDs!
73,
Sandy W5TVW K1 #1178
- Original Message -
From: ron [EMAIL PROTECTED]
To: Elecraft Reflector elecraft@mailman.qth.net
Sent: Wednesday, September 14, 2005 1:00 PM
I bought an early K2 (SN567) on ebay and had the rig and the required parts
drop shipped to Alan to do the upgrade to Rev B. His workmanship was tops
and his price was very modest as I remember it. I recommend him without
hesitation.
Eric
KE6US
www.ke6us.com
-Original Message-
From:
Please keep in mind that next Wednesday night, 9/14 (9/15 UTC) will be
the next NAQCC 80/40 Meter Sprint. This time the special category is to
welcome newcomers to CW contesting. The top score submitted by a
newcomer (10 or less CW contests under your belt) will be awarded a
certificate of
Please keep in mind that next Wednesday night, 9/21 (9/22 UTC) will be
the next NAQCC 80/40 Meter Sprint. This time the special category is to
welcome newcomers to CW contesting. The top score submitted by a
newcomer (10 or less CW contests under your belt) will be awarded a
certificate of
Touch paddle integrated into the KXPD1 paddle.
It's a little rough looking right now, but works so well it will be worth
refining it over the next few weeks.
See the first pictures at:
http://www.ke6us.com/KX1.htm
Eric
KE6US
www.ke6us.com
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On Wed, 14 Sep 2005, EricJ wrote:
I bought an early K2 (SN567) on ebay and had the rig and the required parts
drop shipped to Alan to do the upgrade to Rev B. His workmanship was tops
and his price was very modest as I remember it. I recommend him without
hesitation.
Alan very kindly has
I have had Alan build the amp for one of my K2s, Also had him upgrade them
all. A real professional job. He seems to thrive, a calling, or hobby, on
building and upgrade them. Just my opinion.
73 Dick W4RAK
- Original Message -
From: EricJ [EMAIL PROTECTED]
To: 'Thom R LaCosta' [EMAIL
On Wed, 14 Sep 2005, Richard Kronick wrote:
I have had Alan build the amp for one of my K2s, Also had him upgrade them
all. A real professional job. He seems to thrive, a calling, or hobby, on
building and upgrade them. Just my opinion.
OK...and now the 64,000 dollar question
Given that
Start here.
http://www.elecraft.com/order_form_parts.htm#K2AtoB
This will bring your early K2 ELECTRICALLY up to the currently shipped rigs.
Obviously, the actual PC boards are not going to be identical so there are
going to be a few physical differences inside, but electrically, you have it
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