[Elecraft] KPA500

[Doug VE3VS]

During the past week or so I have been working T32C with my K3/KPA500
combination. While operating RTTY at the 450-500 watt level, I have noticed,
on many occasions after transmitting my call seeking a contact, a single
clicking sound coming from the amplifier a second or two after key up. Does
anyone have an explanation, or an idea, of what (why) this might be?

Doug, VE3VS


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Re: [Elecraft] My KPA500 has no 270v

[ke9uw]

Go here for a schematic...

http://www.worldwidedx.com/amplifiers/96435-elecraft-kpa500-high-frequency-amplifier-manual-schematics.html

Chuck, KE9UW

-
Chuck, KE9UW
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Re: [Elecraft] K3 H Mode Mixer

[I7SWX]

Hi Jack,

OK for everything.  I do not know the Bruhan's VLF converter but I guess I 
understood how it maybe made.
I have used an MC4066 for an SSB demodulator in my modified FT726R. The Ron is 
very high, on the hundreds ohm. I have also used the 74HC4066 to replace it and 
also used it as a mixer for a diect conversion rx. This IC has a lower Ron, 
severan tens of ohms. The Fst3125 presents, usually, an Ron of around 5 ohm, 
this is important for a lower conversion loss.
I would be interested on the circuit diagram od the Bruhan's VLF converter, 
there is always something to learn.

Thanks and best 73

Gian
I7SWX


>
>Da: wa9fvp [via Elecraft] 
>A: I7SWX 
>Inviato: Domenica 16 Ottobre 2011 5:18
>Oggetto: Re: K3 H Mode Mixer
>
>
>The reason that I ask is because I have a Bruhan's VLF converter that 
uses, what he called, a ring mixer.  The Burhan's converter has a MC4066 
analog switch where the control inputs of two fet switches are inverted and the 
other two are non inverted.  When I saw the schematic of the H mode mixer, it 
reminded me of the Burhan's VLF converter.  The difference is the 
transformers that Burhans used. They  were audio transformers that covered the 
VLF range.   
>Jack WA9FVP
>
>>
> 
>If you reply to this email, your message will be added to the discussion 
below:http://elecraft.365791.n2.nabble.com/K3-H-Mode-Mixer-tp6889343p6896967.html
 
>To unsubscribe from K3 H Mode Mixer, click here. 
>
>

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[Elecraft] KAT100-2 project

[Mike Weir]

Good morning all, I have the K2 serial number 6612 it has the KPA-100 installed 
I am in the process of converting it into the KAT100-2 along with KAT100.
Below are some questions
In the manual I am told to remove C44 from the control board that is beside U1 
in the K2. I noticed this cap was never installed in the first place. I assume 
this step in not needed in my case? My board is REV B3r. 
Because my K2 did have the KPA-100 installed but now is going into the KAT100-2 
enclosure is there any menu settings in the K2 that have to be changed around?I 
noticed there is a black cap over the BNC connector on the K2 as the KPA-100 
was installed, when operting QRP to use this connector is there any menu 
changes that have to be made?With the K2 back to stock power (no KAT-100) there 
is no ground screw with the old cover re-installed. I like to run a 
counterpoise during portable operations. Is there a way of installing a 
thumbscrew ground connection? I also now have to install the KIO2 in the K2 now 
as well. I noticed in the KIO2 manual on page 10 there is a wiring modification 
does my K2 need this mod with the serial number of 6612? Thanks very much for 
your time
Mike
VE3WDM
http://ve3wdm.blogspot.com
  
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Re: [Elecraft] FM split problem solved

[Richard Ferch]

Jim,

You are confusing the subreceiver with VFO B. They are two separate 
things. You don't transmit from the subreceiver, you transmit from VFO 
B, and VFO B is there even if you don't have a subreceiver. To put it 
another way, you can operate split without a subreceiver. BTW, RIT and 
repeater offset have nothing to do with this.

You are correct that you cannot use the subreceiver to receive FM if you 
don't have the FM filter in it. However, you can still transmit from VFO 
B. Just leave the subreceiver turned off in FM and use your K3 as if it 
was a single-receiver K3:

1. Tune to the FM signal you want to receive, using VFO A in FM mode.
2. Tap A>B twice to transfer the frequency and mode settings to VFO B.
3. Tune VFO B to the frequency you want to transmit on, e.g. up 10 kHz 
from VFO A.
4. Hold the SPLIT button. The transmitter will now use the frequency in 
VFO B. The receiver will still be on VFO A.
5. If you want to listen momentarily on your transmit frequency, press 
the REV button. Let go of the REV button to listen to the DX station, 
and definitely let go of it before transmitting.

73,
Rich VE3KI


N7US wrote:

> I have the FM filter only in the main receiver, so I can't use the
> subreceiver to transmit or receive FM, right?
>
> I see the RIT only goes to 9.9 kHz, so I can't quite split up 10.
>
> The repeater offset menu item has a minimum of 20 kHz.
>
> I can emotionally handle not working T32C on another band slot, which is
> good because I think the only way to do it is with RIT if the split is less
> than 9.99 kHz, right?

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[Elecraft] FS KDSP2 DSP Module for K2

[John Klewer]

Assembled and working fine.

Kit price is $239.95

Ship for $210.00 (CONUS)

Thanks
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Re: [Elecraft] K2 DSP vs K3 DSP

[Bob DeVarney W1ICW]

Thanks to all who replied. I think I will stick with the KAF2.

On 10/15/2011 9:15 PM, Bob DeVarney W1ICW wrote:
> Does anyone have a sense of how the DSP for the K2 compares to the K3?
>
> I was very impressed with the DSP in a K3 I was working on for a friend.
>
> I have a K2 myself and have been considering buying the KDSP2 to replace
> my KAF2 for CW EME use. If it's anywhere near as good as the DSP is on
> the K3, then I will be very impressed.
>
> Thanks and 73,
>
> Bob W1ICW
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Re: [Elecraft] My KPA500 has no 270v

[tomb18]

I removed the power supply and reassembled everything and the problem is
gone.  It was not the interlock since this was tested.  All cables seemed
ok.
Anyhow, thanks for all the help.
VA2FSQ 

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Re: [Elecraft] KRC2 V 1.6 firmware released

[Roger D Johnson]

I'm not seeing any difference here. Is there a new version of the
config program? I have v 0.9.3. I downloaded and reinstalled
downloader v 1.6. The installation seemed OK but I see no 6m
in the bandmap and it still says there is no KRC2 connected.

73, Roger


On 10/13/2011 1:12 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> We have released new firmware for the KRC2 that can be downloaded from
> our web page at:
>
> http://www.elecraft.com/K2_Manual_Download_Page.htm#krc2
>
> This version includes:
>
> - Added 6 meter selector in default band-map
> - Holding F4 on power up now replaces band-map with the default band-map.
> - Fixed problem with serial communications when loading band-maps.
>
> 73, Eric
>
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Re: [Elecraft] My KPA500 has no 270v

[Mike Harris]

Just a thought, why isn't the schematic available on the Elecraft site. 
  What is the deal with worldwidedx?

Regards,

Mike VP8NO

On 16/10/2011 10:51, ke9uw wrote:
> Go here for a schematic...
>
> http://www.worldwidedx.com/amplifiers/96435-elecraft-kpa500-high-frequency-amplifier-manual-schematics.html
>
> Chuck, KE9UW
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Re: [Elecraft] My KPA500 has no 270v

[Richard Squire - HB9ANM]

The schematics used to be on the Elecraft site.
For some reason, they have been removed...

Guess they'll come up again some time!

73

Mike Harris wrote:
> 
> Just a thought, why isn't the schematic available on the Elecraft site. 
>  


-
Richard - HB9ANM
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Re: [Elecraft] K3 split on FM

[ab2tc]

Hi,

It works fine for me. Make sure both VFO's are in FM mode. Press the A>B
*twice* to ensure this. I tried this, tuned B a few kHz away and it
transmits fine in split.

AB2TC - Knut


Randy Cook wrote:
> 
> This afternoon, I saw T32C on 10M FM, 29.580..  They were running split
> (actually several split frequencies over the time I was listening).   The
> signal was a solid 59 for a while in Northern California.  I tried to set
> to  Split mode with the transmit frequency high, and got a "Split N/A"
> message.  Checked through the K3 manual about FM and Split and saw nothing
> that would help. Split works fine in USB on all bands.  I have not run FM
> before on the rig, so there may be something obvious that I overlooked.
> Yes, I do have the FM filter installed.
> 
> Any help appreciated.
> 
> 73s
> 
> Randy K6CRC
> K3#2051
> k6crc@
> 
> 
> 
> 
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Re: [Elecraft] Toroid Balun Cores

[Ron D'Eau Claire]

Why would you think that?  Properly designed, an air core balun and a
ferrite core balun are electrically identical. 

I did not mean to imply there's an inherent "defect" in ferrite cores, but
they have limitations that air core inductors do not that must be considered
in any design using them. We accept those limitations because toroidal cores
also have major advantages over air core inductors, such as smaller size and
inherent magnetic self-shielding. 

73, 

Ron AC7AC

-Original Message-

They also didn't do much except make us feel better. Ferrite core chokes 
actually DO something useful.  The cracked balun was poorly designed, so 
it overheated.  That's a DESIGN mistake, not a "defect" of ferrite cores.

73, Jim K9YC

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[Elecraft] KPA500 use on AM

[N8XPQ]

I am curious if anyone has used the KPA500 on AM, and what it's duty cycle 
and output would be. 

Mike N8XPQ

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Re: [Elecraft] K3 H Mode Mixer

[wa9fvp]

Here's the schematic.  I purchased it in 1983.  I was wrong he used a
74HC4066

http://elecraft.365791.n2.nabble.com/file/n6898162/scan0014.jpg 

-
Jack WA9FVP
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Re: [Elecraft] K3 H Mode Mixer

[wa9fvp]

Here's the circuir description.  Again, I was wrong, he called it a balanced
mixer, not a ring mixer.

http://elecraft.365791.n2.nabble.com/file/n6898183/scan0013.jpg 

-
Jack WA9FVP
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[Elecraft] SSB Net on 14.307

[Dave, W8OV]

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Re: [Elecraft] My KPA500 has no 270v

[Jim Sheldon]

I suspect they have been revised a few times since those were first posted and 
the revised ones are different enough that they pulled the originals to 
eliminate confusion.

W0EB

> The schematics used to be on the Elecraft site.
> For some reason, they have been removed...
>
> Guess they'll come up again some time!
>
> 73
>
> Mike Harris wrote:
>
>> Just a thought, why isn't the schematic available on the Elecraft
>> site.
>
>
> -
> Richard - HB9ANM
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> tp6897042p6898141.html
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[Elecraft] Elecraft Net

[zumbruns]

Elecraft net today has moved up to 14.307 due to QRM.  73 
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Re: [Elecraft] KPA500 use on AM

[Guy Olinger K2AV]

AM would be less duty cycle power at 500 watts PEP AM (yes, PEP AM) than
RTTY or CW

Fully modulated AM has a peak power of four times the carrier.  That means
that the AM carrier has to be 1/4 of the KPA500's rated output, or 125 watts
AM carrier.  This is only somewhat more dense of a power pull than SSB.

You cannot run 500 watts AM carrier on the KPA500, which would be 2000 watts
PEP output, illegal in the US, and four times the rated power of the amp.

In the good old days, when FCC power regs for hams were INPUT power, carrier
was allowed to be 1000 watts input, with no mention of the modulation's
sideband power. Since the big rigs were class C with plate modulation,
giving efficiencies of 75% or better, that was 750 watts OUTPUT. Full
modulation was then 3000 watts PEP output.  Double the max SSB these days.
 1500 watts carrier would be 6000 watts PEP.

Those Johnson desk KW rigs on AM sounded loud in a way not heard since.

73, Guy.

On Sun, Oct 16, 2011 at 1:30 PM, N8XPQ  wrote:

> I am curious if anyone has used the KPA500 on AM, and what it's duty cycle
> and output would be.
>
> Mike N8XPQ
>
> --
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[Elecraft] Re (Elecraft ) 160 m loop a big failure

[Mike Rodgers]

Don, I'm certainly sad to hear your having problems. Do you have any excess 
ladder line in the shack? That's about the only thing I can think of. 

My only rfi has been in amplified speakers on 17m. The feedpoint of my 
80 m delta loop is 25' from the shack over the house. The house is not inside 
the loop but under one corner. 
300 ohm line come inside to a manual tuner. The old mfj had a 1:1 balun and the 
palstar I now use is 4:1 but the 1:1 worked. Their is a gap vertical inside the 
loop. I used to run 500 w but now run qrp most of the time. 
Did you have the issue at 100w and is shack on ground or basement level. 

Also some commented on loops being 
Nvis antennas and they are on the cut frequency but the elevation take off 
angle comes down at multiple wavelengths. Their pattern is best compromise at 3 
or 4 wavelengths. 

73
Mike R

Sent from my spy ring
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Re: [Elecraft] Re (Elecraft ) 160 m loop a big failure

[Mel Farrer]

Don, 


You might also consider making it a three sided loop with the apex away from 
the house to a friendly tree.  Several hams are doing it that way and the 
patterns are not the same as a square loop, but the match and multiband 
operation is equal,  a thought.

Mel, K6KBE




From: Mike Rodgers 
To: "Elecraft@mailman.qth.net" 
Sent: Sunday, October 16, 2011 12:28 PM
Subject: [Elecraft] Re (Elecraft ) 160 m loop a big failure

Don, I'm certainly sad to hear your having problems. Do you have any excess 
ladder line in the shack? That's about the only thing I can think of. 

My only rfi has been in amplified speakers on 17m. The feedpoint of my 
80 m delta loop is 25' from the shack over the house. The house is not inside 
the loop but under one corner. 
300 ohm line come inside to a manual tuner. The old mfj had a 1:1 balun and the 
palstar I now use is 4:1 but the 1:1 worked. Their is a gap vertical inside the 
loop. I used to run 500 w but now run qrp most of the time. 
Did you have the issue at 100w and is shack on ground or basement level. 

Also some commented on loops being 
Nvis antennas and they are on the cut frequency but the elevation take off 
angle comes down at multiple wavelengths. Their pattern is best compromise at 3 
or 4 wavelengths. 

73
Mike R

Sent from my spy ring
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Re: [Elecraft] Toroid Balun Cores

[Ian White GM3SEK]

Ron D'Eau Claire wrote:
>>
>>They also didn't do much except make us feel better. Ferrite core chokes
>>actually DO something useful.  The cracked balun was poorly designed, so
>>it overheated.  That's a DESIGN mistake, not a "defect" of ferrite cores.
>>
>>73, Jim K9YC
>>

>Why would you think that?  Properly designed, an air core balun and a
>ferrite core balun are electrically identical.
>

That simply isn't true. Air-cored chokes are reactive in impedance, 
narrowband and easily detuned. A properly designed ferrite core choke is 
predominantly resistive and broadband, which makes it a much more 
dependable solution.

Steve Hunt G3TXQ has measured a wide range of different chokes and 
plotted the results on a graphic that shows this point very clearly.



In Steve's graphic, an effective choke needs the largest possible 
bandwidth of dark green, preferably with the black underline denoting 
predominantly resistive impedance. This can only be achieved with the 
help of ferrite - and even then, only with the right ferrite core and 
the right kind of winding.

Air-cored chokes are shown to be relatively ineffective, narrowband 
devices... and then there's worse. Steve has also shown that the series 
reactances of the feedline and the wrong kind of air-cored choke can 
sometimes cancel, leading to a higher level of common mode current than 
before. This cannot happen with a ferrite choke that is predominantly 
resistive.

For further information read Steve's page followed perhaps by my own 
article, at:



That in turn will lead you on to K9YC's much longer papers. Steve, Jim 
and I have different styles of presentation but we're absolutely agreed 
on the one key point: an air-core choke and a ferrite-core choke are 
very different indeed.



-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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[Elecraft] KX3 and Paddle

[dalekretzer]

I second the comment by Fred, K6DGW, regarding the new paddle on the 
front of the KX3. We were together yesterday at Pacificon when examining 
it and it's both an excellent paddle and nothing like the paddle offered 
as an option with the KX1. If I understood Wayne correctly, it is a 
custom design. It is adjustable and sits on the front of the KX3 in a 
comfortable operating position.

Wayne gave a very thorough presentation on the KX3, we got to handle one 
of two at the booth, and the enthusiasm building for this latest 
Elecraft product seems very well founded. The ordering lineup for this 
baby is going to exceed all previous for new Elecraft releases.

At the HFPack forum session, it was enjoyable to hear Wayne's enthusiasm 
for the KX3, field operations and QRP in general. It's very satisfying 
to be supporting a company with leaders like Wayne and Eric who so 
completely understand and stay connected with the amateur radio community.

Wayne said the field test team soon will have KX3s in their hands, so 
product advancement is moving along very close to schedule. He also 
indicated a provision for 2M operation looks like it can be fit into the 
box.

73, Dale
K6PJV - Sacramento
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Re: [Elecraft] K3 H Mode Mixer

[I7SWX]

Hi Jack,

thanks for the circuit diagram and info on the converter. You should not 
feel sorry if you did not remember the right IC p/n and type of mixer20
years of space are a long time to remember small particulars...hi

Thanks again for the discussion and best 73

Gian
I7SWX

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Re: [Elecraft] Toroid Balun Cores

[John Ragle]

An interesting discussion...much is usually made of the "self-shielding" 
property of ferrite toroids, and we see this in practice in interstage 
transformers as well as in "baluns [sic]". (I am talking here about the 
"balun" type also called a "choke balun.")

However, it is also a fact that the magnetic field outside a cylindrical 
solenoid tends to zero as the solenoid tends to "infinite" length. So, 
for example a choke balun wound on a cylindrical form rather than as a 
clump of scramble-wound turns is also more or less self-shielding.

Parenthetically, it is this self-shielding nature of solenoids that 
plays an important role in experimental verification of the Ahranov-Bohm 
effect (see recent QEX  article by Robert Zimmerman and Feynman Lectures 
Vol. II Chapter 15, sections 15.4 and 15.5).

I agree with the contributor(s) who said that the cracked toroid is 
basically junk. It has lost its utility because the magnetic circuit is 
broken at the crack. It is unlikely that superglue will restore it.

John Ragle -- W1ZI

=

On 10/16/2011 4:41 PM, Ian White GM3SEK wrote:
> Ron D'Eau Claire wrote:
>>> They also didn't do much except make us feel better. Ferrite core chokes
>>> actually DO something useful.  The cracked balun was poorly designed, so
>>> it overheated.  That's a DESIGN mistake, not a "defect" of ferrite cores.
>>>
>>> 73, Jim K9YC
>>>
>> Why would you think that?  Properly designed, an air core balun and a
>> ferrite core balun are electrically identical.
>>
> That simply isn't true. Air-cored chokes are reactive in impedance,
> narrowband and easily detuned. A properly designed ferrite core choke is
> predominantly resistive and broadband, which makes it a much more
> dependable solution.
>
> Steve Hunt G3TXQ has measured a wide range of different chokes and
> plotted the results on a graphic that shows this point very clearly.
>
> 
>
> In Steve's graphic, an effective choke needs the largest possible
> bandwidth of dark green, preferably with the black underline denoting
> predominantly resistive impedance. This can only be achieved with the
> help of ferrite - and even then, only with the right ferrite core and
> the right kind of winding.
>
> Air-cored chokes are shown to be relatively ineffective, narrowband
> devices... and then there's worse. Steve has also shown that the series
> reactances of the feedline and the wrong kind of air-cored choke can
> sometimes cancel, leading to a higher level of common mode current than
> before. This cannot happen with a ferrite choke that is predominantly
> resistive.
>
> For further information read Steve's page followed perhaps by my own
> article, at:
>
> 
>
> That in turn will lead you on to K9YC's much longer papers. Steve, Jim
> and I have different styles of presentation but we're absolutely agreed
> on the one key point: an air-core choke and a ferrite-core choke are
> very different indeed.
>
>
>

-- 
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[Elecraft] Elecraft CW Net Report for October 2nd & 3rd and October 9th & 10th, 2011

[kevinr]

Good Afternoon,
I have a little time to catch up on these reports today so I will 
get them out before the first net.  The sun is shining and the 
temperature has zoomed up to 56 degrees F!  Very warm after the cold we 
had last week during all that rain.  No wind but there is some gunfire.  
I am not sure if they are just target shooting or if there are any deer 
around.  The state police just drove by so who knows what is going on?  
They inspect their antenna site at least once a month.

Propagation has been great all week with just a little noise.  Even 
with my wire antennas I am getting all sorts of DX as I monitor the 
bands.  At this desk I get ten through twenty meters so I can follow the 
openings.  With so many reports on the various email lists it is simple 
to track them down with a spin of the dial.

On to the lists =>

   On 14050 kHz at 2200z:
K1THP - Dave - CT - K3 - 686
W0CZ - Ken - ND - K3 - 457
N0AR - Scott - MN - K2 - 4866
NO8V - John - MI - K3 - 820
W8OV - Dave - TX - K3 - 3139
KN5L - John - TX - K3 - 4448
KB3FBR - Joe - PA - K2 - 6178
AB9V - Mike - IN - K3 - 398
AC5P - Mike - OK - K3 - 2170
N0TA - John - CO - K3 - 994
WA3MIX - Lou - PA - K3 - 4290

   On 7045.5 kHz at 0100z:
K0DTJ - Brian - UT
W8OV - Dave - TX - K3 - 3139
W0CZ - Ken - ND - K3 - 457
K1THP - Dave - CT - K3 - 686
N0TA - John - CO - K3 - 994
N0AR - Scott - MN - K2 - 4866
AC5P - Mike - OK - K3 - 2170
NO8V - John - MI - K3 - 820
K6PJV - Dale - CA - K3 - 1183
KN5L - John - TX - K3 - 4448
WB5BKL - Nick - TX - K3 - 231
W9QP - John - SC

Elecraft CW Net Report for October 2nd & 3rd, 2011

   On 14049.5 kHz at 2200z:
W0CZ - Ken - ND - K3 - 457
NO8V - John - MI - K3 - 820
K4JPN - Steve - GA - K2 - 1422
N0TA - John - CO - K3 - 994
AC5P - Mike - OK - K3 - 2170
N0AR - Scott - MN - HW8
KN5L - John - TX - K3 - 4448
KB3FBR - Joe - PA - K2 - 6178

   On 7045.5 kHz at 0100z:
NO8V - John - MI - K3 - 820
W7PAU - Paul - OR
NS7P - Phil - OR - K3 - 1826
AC5P - Mike - OK - K3 - 2170
W6JDB - Jay - OR - K3 - 1288
N0TA - John - CO - K3 - 994
K0DTJ - Brian - CA - K3 - 4113
NY6G - Stan - CA - Kenwood
N0AR - Scott - MN - HW8
K6PJV - Dale - CA - K3 - 1183
W8OV - Dave - TX - K3 - 3139
W0CZ - Ken - ND - K3 - 457
KN5L - John - TX - K3 - 4448
W7AQK - Dave - AZ - K3 - 96

After the nets I have not found enough time in the day to write the 
reports.  So I am catching up today before they stack up too deeply.  
Soon, though, I will move the second net earlier by an hour so I have 
more time in the evening to write them.  I have had time to get the 
serial numbers on the lists while adding each contact to the database.  
Maybe during the dark winter months I'll get the database repaired from 
the crash of almost a year ago so I can add the number of check ins each 
of you has made to the nets.  Now back to my chores :)
Please come to the nets in a little over an hour.

73,
Kevin.  KD5ONS   (Net Control Operator 5th Class)

-

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Re: [Elecraft] Toroid Balun Cores

[Jim Wiley]

OK, now I am confused (a normal state of affairs around here)


If a "cracked" toroid core is useless,  then how do the "split bead" 
clamp-on cores manage to work?  Isn't the "split" equivalent to as great 
big lengthwise crack? 


I also seem to remember broken ring cores working again when glued 
together. 


After all, isn't a ferrite core itself manufactured from ferrite powder 
that has been "glued together" by a binding material?  Yes, the 
particles are pressed very close to one another,but they are still 
individual particles, are they not?


- Jim, KL7CC



John Ragle wrote:
>  
>   

> I agree with the contributor(s) who said that the cracked toroid is 
> basically junk. It has lost its utility because the magnetic circuit is 
> broken at the crack. It is unlikely that superglue will restore it.
>
> John Ragle -- W1ZI
>
>   
>
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Re: [Elecraft] Toroid Balun Cores

[Jack Smith]

First, even a very thin gap may significantly reduce the core 
permeability. A high quality split core will have its mating surfaces 
lapped flat.

Second, if the core cracked because of excessive heat, it's likely the 
ferrite material incurred irreversible damage.

Jack K8ZOA


On 10/16/2011 5:58 PM, Jim Wiley wrote:
>
> OK, now I am confused (a normal state of affairs around here)
>
>
> If a "cracked" toroid core is useless,  then how do the "split bead"
> clamp-on cores manage to work?  Isn't the "split" equivalent to as great
> big lengthwise crack?
>
>
> I also seem to remember broken ring cores working again when glued
> together.
>
>
> After all, isn't a ferrite core itself manufactured from ferrite powder
> that has been "glued together" by a binding material?  Yes, the
> particles are pressed very close to one another,but they are still
> individual particles, are they not?
>
>
> - Jim, KL7CC
>
>
>
> John Ragle wrote:
>> 
>>
>> I agree with the contributor(s) who said that the cracked toroid is
>> basically junk. It has lost its utility because the magnetic circuit is
>> broken at the crack. It is unlikely that superglue will restore it.
>>
>> John Ragle -- W1ZI
>>
>>
>>
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Re: [Elecraft] KRC2 V 1.6 firmware released

[Jack Brindle]

We will definitely let you know when the KRC2 config tool is updated. We are 
trying to do something about that at this time.

Upgrading a new firmware version into the KRC2 does not modify the band maps - 
that allows continued use of the current band maps that may have been modified 
previously. This also means that the upgrade itself does not add the 6 meter 
selection. If you want to add that, you will need to perform the band map 
defaults reset by holding the F4 button while powering up the KRC2. When the 
revised KRC2 Config Tool is released you will be able to edit the 6 meter 
selector with that tool. Until, then, the only way to add this selector is 
through the band map reset.

73,

Jack Brindle, W6FB
Elecraft Engineering


On Oct 16, 2011, at 9:40 AM, Roger D Johnson wrote:

> I'm not seeing any difference here. Is there a new version of the
> config program? I have v 0.9.3. I downloaded and reinstalled
> downloader v 1.6. The installation seemed OK but I see no 6m
> in the bandmap and it still says there is no KRC2 connected.
> 
> 73, Roger
> 
> 
> On 10/13/2011 1:12 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
>> We have released new firmware for the KRC2 that can be downloaded from
>> our web page at:
>> 
>> http://www.elecraft.com/K2_Manual_Download_Page.htm#krc2
>> 
>> This version includes:
>> 
>> - Added 6 meter selector in default band-map
>> - Holding F4 on power up now replaces band-map with the default band-map.
>> - Fixed problem with serial communications when loading band-maps.
>> 
>> 73, Eric
>> 
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Re: [Elecraft] Serial #5887 - Delivered Today

[ke9uw]

You have to remove the sub to install them...
I pretty much knew what I wanted after decades of ham radio so I 
just bought the 8 pole ones and put them in right away.

-
Chuck, KE9UW
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Re: [Elecraft] Toroid Balun Cores

[Vic K2VCO]

Some confusion results from the fact that there are two different materials 
used in 
toroids (etc.): Ferrite and powdered iron. Powdered iron cores are composed of 
tiny 
particles which are insulated from one another...so if they break you can glue 
them back 
together and they will work fine.

Ferrite is a ceramic material, and if you glue a broken piece of ferrite back 
together you 
are introducing an insulating gap which breaks the magnetic circuit. Powdered 
iron is a 
bunch of little magnets separated by gaps already.

Baluns seem to be made out of ferrite.


On 10/16/2011 3:13 PM, Jack Smith wrote:
> First, even a very thin gap may significantly reduce the core
> permeability. A high quality split core will have its mating surfaces
> lapped flat.
>
> Second, if the core cracked because of excessive heat, it's likely the
> ferrite material incurred irreversible damage.
>
> Jack K8ZOA
>
>
> On 10/16/2011 5:58 PM, Jim Wiley wrote:
>>
>> OK, now I am confused (a normal state of affairs around here)
>>
>>
>> If a "cracked" toroid core is useless,  then how do the "split bead"
>> clamp-on cores manage to work?  Isn't the "split" equivalent to as great
>> big lengthwise crack?
>>
>>
>> I also seem to remember broken ring cores working again when glued
>> together.
>>
>>
>> After all, isn't a ferrite core itself manufactured from ferrite powder
>> that has been "glued together" by a binding material?  Yes, the
>> particles are pressed very close to one another,but they are still
>> individual particles, are they not?
>>
>>
>> - Jim, KL7CC
>>
>>
>>
>> John Ragle wrote:
>>> 
>>>
>>> I agree with the contributor(s) who said that the cracked toroid is
>>> basically junk. It has lost its utility because the magnetic circuit is
>>> broken at the crack. It is unlikely that superglue will restore it.
>>>
>>> John Ragle -- W1ZI
>>>
>>>


-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] KAT100-2 project

[Don Wilhelm]

Mike,

For your K2 or any others above SN3000, those changes mentioned in the 
KPA100 manual have already been made.

There is no difference in the K2 board wiring between mounting the 
KPA100 directly on the base K2 or mounting it in an external enclosure.  
That information is for those having older K2s that have not yet been 
modified or upgraded.

Yes, you will have to remove the boot on the K2 BNC jack when the KPA100 
is mounted externally (unless you have the KAT2 installed in the QRP top 
cover.

Yes, you will need the KIO2 or a suitable substitute to carry the 
signals needed by the KPA100 from the base K2.  Those signals are on the 
ribbon cable when the KPA100 is mounted on the base K2.  The KIO2 merely 
acts as a 'conduit' for those signals - it has nothing to do with the 3 
RS-232 signal lines in the AUX IO connector.  Also note that when 
remoting the KPA100, you will lose the ability to connect the AUX IO 
connector on the KPA100 to a computer.  If you need the computer 
connection, you will need to add the KIO2.

If you have the KAT2 installed in the top cover, there is a 5 way 
binding post provided for a ground.  If you want a ground connection 
without the KAT2, add one to the hole in the top cover labeled GND (or 
something like that).  A 5 way binding post can be used, or simply a 
6-32 machine screw, 2 nuts and 2 washers will do fine.  Be sure to 
scrape some paint off the inside of the hole so you have a good 
connection of the screw head to the aluminum.

73,
Don W3FPR

On 10/16/2011 11:02 AM, Mike Weir wrote:
> Good morning all, I have the K2 serial number 6612 it has the KPA-100 
> installed I am in the process of converting it into the KAT100-2 along with 
> KAT100.
> Below are some questions
> In the manual I am told to remove C44 from the control board that is beside 
> U1 in the K2. I noticed this cap was never installed in the first place. I 
> assume this step in not needed in my case? My board is REV B3r.
> Because my K2 did have the KPA-100 installed but now is going into the 
> KAT100-2 enclosure is there any menu settings in the K2 that have to be 
> changed around?I noticed there is a black cap over the BNC connector on the 
> K2 as the KPA-100 was installed, when operting QRP to use this connector is 
> there any menu changes that have to be made?With the K2 back to stock power 
> (no KAT-100) there is no ground screw with the old cover re-installed. I like 
> to run a counterpoise during portable operations. Is there a way of 
> installing a thumbscrew ground connection? I also now have to install the 
> KIO2 in the K2 now as well. I noticed in the KIO2 manual on page 10 there is 
> a wiring modification does my K2 need this mod with the serial number of 
> 6612? Thanks very much for your time
> Mike
> VE3WDM
>
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Re: [Elecraft] Toroid Balun Cores

[John Ragle]

Jim...

 I think the snap-ons are designed to be lossy devices. They are 
designed to be a convenient shape for wires, cords, cables, etc. and to 
provide loss for fields that fringe out of those cables. Tiny air gaps 
are not particularly important for this function.

 Ferrite donuts used as transformer cores are for transferring 
magnetic flux from primary to secondary without leakage.

 In a real balun, the action is as a transformer...remember those 
plug-in coils with "links" on them that Millen et al. used to make, back 
when...? Those were air-core transformers (and not very efficient...). 
The core in the balun on your beam was probably a transformer core.

 Again, 'way back when, when transformers for tube "B+" & filament 
voltages were normal parts of power supplies, the windings were on 
interleaved, laminated "E"-shaped core material. In those, working at 60 
Hz, a tiny air gap could be tolerated, even though its effect was 
somewhat like a "magnetic" resistor in the flux path. One does not see 
these as much any more, but I can remember taking them apart to harvest 
the wire inside...and being left with dozens of the laminations...

John Ragle -- W1ZI

=

On 10/16/2011 5:58 PM, Jim Wiley wrote:
>
> OK, now I am confused (a normal state of affairs around here)
>
>
> If a "cracked" toroid core is useless,  then how do the "split bead"
> clamp-on cores manage to work?  Isn't the "split" equivalent to as great
> big lengthwise crack?
>
>
> I also seem to remember broken ring cores working again when glued
> together.
>
>
> After all, isn't a ferrite core itself manufactured from ferrite powder
> that has been "glued together" by a binding material?  Yes, the
> particles are pressed very close to one another,but they are still
> individual particles, are they not?
>
>
> - Jim, KL7CC
>
>
>
> John Ragle wrote:
>> 
>>
>> I agree with the contributor(s) who said that the cracked toroid is
>> basically junk. It has lost its utility because the magnetic circuit is
>> broken at the crack. It is unlikely that superglue will restore it.
>>
>> John Ragle -- W1ZI
>>
>>
>>
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>
>

-- 
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Re: [Elecraft] K3 H Mode Mixer

[wa9fvp]

I still use the Burhans converter along with my K3 to copy VLF.  I'm feeding
the converter into the receive input on my K3. Lately I have been using the
MULTIPSK software by F6CTE to decode MSK in the 300KHz range.  It's abit out
of the realm of Ham Radio but it's something I've done for years. 

You can download the software at, http://f6cte.free.fr/index_anglais.htm

-
Jack WA9FVP
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[Elecraft] Elecraft SSB Net results (10/16/11)

[Phillip Shepard]

We had to QSY at the beginning of the net to dodge another net that had been
pushed down, so we went to 14.307 MHz.  Once settled in, we had a good net
with generally strong signal levels.  We had 31 participants over a 26
minute period.  We even had a new UK station, John/G3XRJ.  The discussion
topics were the KX-3 availability, the P3 on the upcoming ARRL auction and
North American SOTA day next Saturday (10/22).  Have a great week.

Here is the list of participants.

Station NameQTH Rig S/N

W6GFGeorge  CA  K3  4452
N6JWJohnCA  K3  936
KC5RY   George  TX  K3  5208
W5ETJ   GaryTX  K3  3227
W0SZSteve   CO  K3  176
K6SBA   David   CA  K3  565
K8EAG   Gil MI  K3  99
AE6IC   FredCA  K3  2241
AL7CE   Terry   AK  K3  5137
W0CZKen ND  K3  457
WO1IDickMA  K3  911
KF5IMA  Bruce   MS  K2  3575
KK7PLyleWA  K3  3036
NV5ERob TX  K3  1417
KC9LIF  KentIL  K2  6896QRP
K4GCJ   Gerry   NC  K3  1597
NJ6GDennis  CA  K3  5717
W7NMD   Palmer  AR  K3  3779
KN5LJohnTX  K3  4448
KA0NCR  Arnie   NE  K3  185
W4RKS   Jim AL  K3  3618
K7QHD   KurtAZ  K2  1538
W8OVDaveTX  K3  3139
KG6IRW  David   CA  K3  4982
G3XRJ   JohnUK  K3  4606
N1KDO   JeffGA  K3  4554
W8YMO   Harry   OH  K3  166
W6RSP   Ken CA  IC746PRO
W6VYBob CA  K3  2765
AC0EJim KS  K3  5674
NS7PPhilOR  K3  1826

73,

Phil, NS7P

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Re: [Elecraft] [K3]_[KRC2]_Is_there_a_KRC3_in_the_w orks?

[Eric Swartz WA6HHQ - Elecraft]

Its a -very- active current project. :-) We have finished SVGA hardware on 
completed pc boards. The firmware is being finished and tested in the lab as I 
type this. 

The SVGA adapter for the P3 plugs into the  existing rear IO board inside the 
P3. It can be added to any existing P3 very easily.

We are currently displaying P3 data on the external monitor at up to 1920 x 
1080p. It looks very cool. Stay tuned!

73,
Eric

www.elecraft.com
_..._



On Oct 14, 2011, at 10:44 PM, Bob  wrote:

> Leave it at or??   Please expand on the "or".
> 
> Is the P3 a finished project "or" we ever see the ability to attach a larger 
> screen as was
> mentioned here on the reflector.   That ability was a consideration in the 
> original purchase.
> 
> 73,
> Bob
> K2TK
> 
> On 10/14/2011 3:01 PM, Wayne Burdick wrote:
>> We're trying to line up a resource to update it. Everyone seems to be
>> working on the K3, or the KX3, or the KAT500, or... well, let's just
>> leave it at "or".
>> 
>> 73,
>> Wayne
>> N6KR
>> 
>> 
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[Elecraft] Trade request

[Robert Kalkwarf]

Hi Guys,  I know no one wishes to trade their last K2 but I am hoping that 
someone has an extra that would consider it.  I have a very nice FT-100D with 
500Hz and 250Hz CW filters, TCXO and DSP w/ unused ATAS-120A antenna.  I have 
some additional items to add depending on the K2 configuration and serial 
number.  Any interest?

73 Bob w7wo Lacey, Wa

b...@kalkwarf.com

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