Yes, I think you may be absolutely right, Don. I measured a maximum effect
of 9% in the one example I tested - a random core lying on my bench that had
about a dozen turns on it. That agrees with your experience of finding up to
a 10% change available.
I saw your suggestion before, and it certain
Ron,
I have the same inductance meter, and it does a good job because it does
measure using the LR time constant rather than frequency, but 'physics is
physics', and with a true toroidal inductor, there is still no dependency on
the turns spacing (the math says so).
Now, for the practical side of
Eric, KE6US wrote:
I don't have your experience or background, Ron, but the L-meter is
measuring inductance indirectly and ignoring the presence of distributed
capacitance. Maybe it isn't as negligible at the frequency of the meter as
you think.
But in the end, it doesn't really matter. The real
I don't have your experience or background, Ron, but the L-meter is
measuring inductance indirectly and ignoring the presence of distributed
capacitance. Maybe it isn't as negligible at the frequency of the meter as
you think.
But in the end, it doesn't really matter. The real test is how a partic
Okay, this is interesting so I approached an answer in my usual way.
I grabbed a loose toroidal inductor that had nicely spaced turns filling 90%
of the circumference of the core and stuck it in my L-meter. 3.1 uH.
Scrunched all the turns tightly together. They filled about 20% of the
circumfere
Hi Ken,
The problem is typically of high current small loops and tuned matching
circuits. Also, sunlight can heat up the coil and the variable capacitor
and cause dimensions to shift and therefore the resonant frequency.
Tightening the spring is good. Putting a shaft lock on the shaft "might"
Two errors in last night's report.
Russ - N9IV - was running his K2 at near QRP levels. I knew it was low
power so took a chance on it being his KX1. Whoops!
The next error was for:
Ken - N5EBD - running a vintage K1-40/20 with S/N - 34. Now that his rig
is getting broken in it is doing
On Aug 29, 2005, at 11:17 AM, David wrote:
Antennas where disconnected and the house next door took the direct
hit
and blew a big chunk out of the back of the house.
Don't just disconnect your antennas - GROUND them.
Possibly would have saved your rig.
Bill Coleman, AA4LR, PP-ASEL
Darrell,
There may be a small apparent change in inductance when adjusting the turns
spacing of a toroid, but it would only be a small percentage - look at the
formulas for a toroid inductor to verify that fact - there is no term for
the turns spacing, and the diameter of the toroid fixes the coil
The toroid formulas are approximations, but good ones. Here is a
physics-based explanation that gives some of the complexities, but there
are literally books on inductors.
http://tinyurl.com/9brxb
Leigh / WA5ZNU
On Mon, 29 Aug 2005 3:52 pm, Darrell Bellerive wrote:
Well, it seems now that I a
Don't forget that Elecraft Technical Support is always only an email away. When
you have a question that can't be answered on the Elecraft list or are stumped
troubleshooting a problem, make sure to contact our experienced engineers at
[EMAIL PROTECTED] :-)
Gary, Scott, Brian and Richard are e
Well, it seems now that I am receiving contradictory information. Specifically
that compressing the turns on a toroid will raise the inductance.
What is the real scoop. Does compressing or expanding the spacing of the
winding on a toroid change the inductance? Or just the distributed
capacitanc
Oh, Yes... been there done all of that. I have tried a number of things.
Will probably just order a new one. And then fix the old one and sell it.
Bill
K9YEQ
K2-#35
KX1-#35
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Bosscher
Sent: Monday, A
Hello Darrell,
The inductance of the toroids typically used in the K2 can be increased by
compressing the turns. This can be done to fine-tune a circuit but for
consistent results, it's probably best to do it the way the Elecraft guys
recommend and spread out the turns a bit.
I've evaluated a tor
Late serial K2 with most accessories for sale at Elecraft prices.
Perfect condition electrically and physically
Telephone for full information 9a to 9p Pacific 360 638 2707
73
Earl W7TK
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You mus
The Elecraft designers have stated in past discussions that Coil Dope is not
needed if you wind your toroids tight. Remember, that the dielectric
constant of Coil Dope can change your tuning of the coil. It would be
alright to use a few drops on ends of winding as an aid, but a lot could be
a
Thanks to all who responded. I had no plans of deviating from the number of
turns that Elecraft directs. I will follow their instructions as to the best
of my ability.
I have learned a few things:
1) Adjusting the spacing of the winding on the toroids does not change the
inductance, just the d
Thanks to all who emailed me.
Just to clarify, I will not be replacing any of the Elecraft supplied parts.
>From what I have read Elecraft goes to great lengths to ensure high quality
components and subsituting those parts with my own would be a recipe for
disaster. I also will not deviate from
I do a lot of camping and have used several portable antennas over the
years. Two weeks ago I bought a MFJ-1788 Super HI-Q Loop. I have been on two
camping trips with it and it does seem to get out and receive well. I used
my K2/100 and made 46 contacts for a total of almost 15 hours of operatin
Mercy, Mercy That is terrible And also sorry about no YL!
Paul Gates
K1 #0231
KX1 #1186
XG1
[EMAIL PROTECTED]
Original Message Follows
From: "David" <[EMAIL PROTECTED]>
To: "'Paul Gates'" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>
CC:
Subject: RE: [Elecraft] MY SECOND K2
Dat
Okay radios where turned off
Antennas where disconnected and the house next door took the direct hit
and blew a big chunk out of the back of the house.
It appears that the blast came in through my astron rs35 which was
toasted by the strike.
And I don't have a yl to tell.
-Original Message--
You are probably correct but why was lightening allowed to enter this chap's
first K2. Was that the only good reason he could think of to tell his yl
that he needed to build another one? Just wondering. Remember inquiring
minds need to know. LOL!
Paul
Paul Gates
K1 #0231
KX1 #1186
XG1
[
Bill Johnson wrote:
Please continue to keep this one live on the reflector as I am also having
problems with mine and will use your findings to help me.
Bill
K9YEQ
Do you folks have the rs-232 port turned on via the menu?
I use the rs-232 all the time, and this got me once.
I was told by my agent that they would have covered the my labor if I
had asked for it but I did not because it was just to much fun to build
and they are letting me the damaged equipment and I think I can rebuild
the first k2 and get it working a hundred percent. It is all covered by
my home owner
That's what started it all - the silver
lining is one heck of a good conductor... :-)
Mike AB3AP
On Mon 29-Aug-05 at 1005 EDT, James Kern wrote:
> Every cloud has it's silver lining - have fun building that second K2!
>
> 73,
>
> James Kern KB2FCV
>
>
> -Original Message-
> From: [EM
> Well I have ordered a second k2. my first k2 got hit with lightning
> so now I get to repair the first but the insurance is paying for
> another cause I don't know if the first is repairable.
I'm curious if insurance covered any cost of building or did they just cover
the cost of the kit? Was
Every cloud has it's silver lining - have fun building that second K2!
73,
James Kern KB2FCV
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David
Sent: Monday, August 29, 2005 10:01 AM
To: 'K. J.'; elecraft@mailman.qth.net
Subject: [Elecraft] MY SECON
Well I have ordered a second k2. my first k2 got hit with lightning so
now I get to repair the first but the insurance is paying for another
cause I don't know if the first is repairable. But I do get to have the
fun of building a second k2.
see ya
73's
N1IB
David Schornak
K2 03027
K2 0
www
Please continue to keep this one live on the reflector as I am also having
problems with mine and will use your findings to help me.
Bill
K9YEQ
K2-#35
KX1-#35
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of James Kern
Sent: Friday, August 26, 2005 10:0
Hello all,
Late last year, I had my K2 (QRP with all options) serviced by one of
the popular list members. I really wasnt satisfied with the results
and recently sent the rig to Elecraft for a "good" going over.
Elecrafts results were remarkable. 19itemsw
Fran,
My K2/100 S/N 04031 KSB2 board is stock except for the filter width
which is 2.5 kc.
I use the Elecraft (Heil) MD 2 microphone.
On the air reports I receive would indicate that my audio is excellent.
Adjusting the filters in my opinion is the most important part of
getting good audio res
I have a couple kits I just don't have time to build.
Please contact me offline if interested. All include shipping (in US).
BLT Tuner - unbuilt - $ 45 -- Still Available
Amtel AVR kit from 2004 Buildathon (includes optional quick release socket)
and all parts from session includin
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