Re: [Elecraft] Technical question on keying of an SDR radio

[Wayne Burdick]

By the way, a similar explanation can be found in the Theory of Operation 
section of any of our transceiver manuals.

Wayne
N6KR


> On Apr 7, 2019, at 9:58 PM, Phil Hystad via Elecraft 
>  wrote:
> 
> If you look at various old circuit diagrams of ancient radios made from 
> electronic circuits you find that the telegraph keying for the radio involves 
> switching on and off the driving oscillator frequency or something similar.
> 
> However, with an SDR, you have other options and I have no idea how it is 
> typically done.  For example, a digital signal can be produced that 
> represents the Morse coding and this signal need merely be converted to 
> analog and amplified.  Or, is there still an analog circuit being switched on 
> and off for Morse code (telegraphy) keying with a modern SDR.
> 
> Can someone describe how this is done in a radio like the KX2.  And, is it 
> done differently in the different Elecraft radios — I presume that the K2 
> would have the more traditional sort of circuit but that is really just a 
> wild guess on my part.
> 
> 73, phil, K7PEH

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Re: [Elecraft] Technical question on keying of an SDR radio

[Wayne Burdick]

Hi Phil,

In the K2 the sidetone starts off as a squarewave created by the 
microcontroller. This is then shaped and injected into the AF amplifier. The 
sidetone is turned on/off at the same time as the carrier, which is generated 
by the LO (PLL synth) mixing with a gated TX BFO signal.

In our DSP-based radios (K3/K3S and KX2/KX3), both the audio sidetone and the 
15 kHz 2nd IF carrier are created by the DSP. Their rising edges are shaped 
mathematically using what's called a "raised cosine" or sigmodal waveform. We 
experimented to find the ideal waveform equation, the result being the cleaned 
signal possible, with virtually no key clicks. The DSP can of course do other 
things like apply amplitude or frequency modulation, generate voice and data 
mode signals, apply ALC and audio EQ, etc. CW is just the simplest case of what 
can be done.

From the DSP, the digitized audio signal codes to a DAC (part of the audio 
CODEC IC), which then converts it to analog for injection into the AF amp. 

The 15 kHz 2nd IF carrier in the K3/K3S goes to a transmit mixer on the KREF4 
module where it's up-converted to about 8215 kHz. It is then routed to the 
first IF mixer. The 8215 kHz signal passes through two crystal filters enroute 
mixer. In the KX2/KX3, the 15 kHz IF signal is converted to a pair of IQ 
signals (90 degrees out of phase with each other) to directly modulate a 
quadrature up-converter. The other input to the up-converter is a pair of 
balanced LO signals, again separated by 90 degrees. A result of IQ modulation 
is that one sideband is cancelled out, resulting in a single RF carrier at the 
desired frequency.

In all cases, the rest of the T/R sequencing involves the usual amplifiers, PIN 
diodes, filter switching, etc.

73,
Wayne
N6KR



> On Apr 7, 2019, at 9:58 PM, Phil Hystad via Elecraft 
>  wrote:
> 
> If you look at various old circuit diagrams of ancient radios made from 
> electronic circuits you find that the telegraph keying for the radio involves 
> switching on and off the driving oscillator frequency or something similar.
> 
> However, with an SDR, you have other options and I have no idea how it is 
> typically done.  For example, a digital signal can be produced that 
> represents the Morse coding and this signal need merely be converted to 
> analog and amplified.  Or, is there still an analog circuit being switched on 
> and off for Morse code (telegraphy) keying with a modern SDR.
> 
> Can someone describe how this is done in a radio like the KX2.  And, is it 
> done differently in the different Elecraft radios — I presume that the K2 
> would have the more traditional sort of circuit but that is really just a 
> wild guess on my part.
> 
> 73, phil, K7PEH
> 
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[Elecraft] Technical question on keying of an SDR radio

[Phil Hystad via Elecraft]

If you look at various old circuit diagrams of ancient radios made from 
electronic circuits you find that the telegraph keying for the radio involves 
switching on and off the driving oscillator frequency or something similar.

However, with an SDR, you have other options and I have no idea how it is 
typically done.  For example, a digital signal can be produced that represents 
the Morse coding and this signal need merely be converted to analog and 
amplified.  Or, is there still an analog circuit being switched on and off for 
Morse code (telegraphy) keying with a modern SDR.

Can someone describe how this is done in a radio like the KX2.  And, is it done 
differently in the different Elecraft radios — I presume that the K2 would have 
the more traditional sort of circuit but that is really just a wild guess on my 
part.

73, phil, K7PEH

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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[George Thornton]

I concur wholeheartedly and thank you.


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Eric Swartz - WA6HHQ, Elecraft
Sent: Sunday, April 7, 2019 9:05 PM
To: Ken G Kopp 
Cc: Elecraft 
Subject: Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

Folks - I just been made aware of the posting below.  I am very disappointed 
and distressed that this happened here. 

This extremely inappropriate and racist posting is in direct violation of the 
Elecraft list guidelines, and it is also in direct conflict with the Ethics we 
at Elecraft stand for.  Posts of this type involving both racial and/or direct 
attacks on others, regardless of where they are born or live, will not be 
tolerated here. Period.

As a side note, Martin, the owner of of MFJ, was born in and grew up in 
Mississippi. He earned his engineering degrees from Mississippi State 
University Bagley College of Engineering and also the Georgia Institute of 
Technology. I know Martin and he is an honorable hard working person with 
impeccable values who has our deepest respect. 

Ken, the list deserves a direct apology, as does Martin.

Eric
elecraft.com
_..._

> On Apr 7, 2019, at 9:35 AM, Ken G Kopp  wrote:
> 
> Perhaps the matter stems from the nationality of MFJ's owner and a 
> different set of values.
> 
> K0PP
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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Eric Swartz - WA6HHQ, Elecraft]

Folks - I just been made aware of the posting below.  I am very disappointed 
and distressed that this happened here. 

This extremely inappropriate and racist posting is in direct violation of the 
Elecraft list guidelines, and it is also in direct conflict with the Ethics we 
at Elecraft stand for.  Posts of this type involving both racial and/or direct 
attacks on others, regardless of where they are born or live, will not be 
tolerated here. Period.

As a side note, Martin, the owner of of MFJ, was born in and grew up in 
Mississippi. He earned his engineering degrees from Mississippi State 
University Bagley College of Engineering and also the Georgia Institute of 
Technology. I know Martin and he is an honorable hard working person with 
impeccable values who has our deepest respect. 

Ken, the list deserves a direct apology, as does Martin.

Eric
elecraft.com
_..._

> On Apr 7, 2019, at 9:35 AM, Ken G Kopp  wrote:
> 
> Perhaps the matter stems from the nationality of MFJ's owner and a
> different set of values.
> 
> K0PP
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Re: [Elecraft] Automatic tuner implementation

[Dr. William J. Schmidt]

Wayne is correct here.  If you don't use a principled approach to finding
the the best tuning solution, there are excellent binary searches that have
roots in game theory that are extremely good.  The optimum is to marry them
both.  The most successful commercial (militairy) algroithms start with a
phase-amplitude transfer function inversion to get very close to a solution
followed by a binary search to the final solution.


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Andy Durbin
Sent: Sunday, April 7, 2019 8:20 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Automatic tuner implementation

"It's all about "pruning the search tree," to borrow a term from game
theory."

That always struck me as being a bit like trying to whack a pinata while
blindfolded. Why is it not possible to measure the complex impedance and
compute the solution?  That should be a lot faster than any iterative
method.  Sure, it needs a better detector but isn't Elecraft about elegant
solutions?

I'll probably find the answer for myself in a while as it's on the list of
things to try with my Kenwood/Elecraft interface (I have LP-100A complex
load impedance available).

Pointers to any failed or successful attempts to do this would be
appreciated.

73,
Andy, k3wyc
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---
This email has been checked for viruses by AVG.
https://www.avg.com

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[Elecraft] Automatic tuner implementation

[Andy Durbin]

"It's all about "pruning the search tree," to borrow a term from game theory."

That always struck me as being a bit like trying to whack a pinata while 
blindfolded. Why is it not possible to measure the complex impedance and 
compute the solution?  That should be a lot faster than any iterative method.  
Sure, it needs a better detector but isn't Elecraft about elegant solutions?

I'll probably find the answer for myself in a while as it's on the list of 
things to try with my Kenwood/Elecraft interface (I have LP-100A complex load 
impedance available).

Pointers to any failed or successful attempts to do this would be appreciated.

73,
Andy, k3wyc
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Bill Frantz]

I remember the bright yellow glow from the final in my Heathkit 
DX-40 when I forgot to connect the antenna. At least the plate 
didn't melt and the tube still worked.


I had a 100W K3 with no tuner and one of my antennas needed a 
tuner, probably for 30M. I used the T1, with the caveat that I 
would always lower the power when running through it. Well, I 
screwed up one time. I think what I noticed was that as my PSK31 
macro ran, the SWR kept rising.


I think I got the cores hot enough to change their magnetic 
properties. When they cooled off, everything went back to normal.


But as I said, Elecraft equipment tends to survive forays well 
outside their specs.


73 Bill AE6JV

On 4/7/19 at 11:47 AM, n...@elecraft.com (Wayne Burdick) wrote:


Bill Frantz wrote:


(I won't mention...


too late!

the time I ran 100W through a T1 tuner. It wasn't for long and 
the tuner survived.)


Ouch. We did T1 tests at 50 W to make sure it could handle 20 
W, and even that was an invitation-only event, with observers 
at a distance wearing safety goggles. How long it would survive 
a KPA1500 is left as an exercise for the reader. I'm imagining 
a soft blue glow from the toroids.


---
Bill Frantz| Security is like Government  | Periwinkle
(408)356-8506  | services. The market doesn't | 16345 
Englewood Ave
www.pwpconsult.com | want to pay for them.| Los Gatos, 
CA 95032


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[Elecraft] Elecraft CW Net Report

[kevinr]

Good Evening,

    I have not been skunked in many years.  But, on 40 meters I was met 
with dead air after each CQ.



  On 14049.5 kHz at 2200z:

NO8V - John - MI  healing as his weather improves

K6XK - Roy - IA   living the good life with cheap parking

AB9V - Mike - IN  enjoying fewer bugs and warmer weather

K4TO - Dave - KY  antenna plans fill his dreams

W0CZ - Ken - ND  still thawing out from a long winter


  On 7047.5 kHz at z:


After the conditions of the twenty meter net I had expected to be 
greeted by many signals on forty meters.  Oh well.



Until next week stay well,

   73,

  Kevin   KD5ONS

-

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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

Hi Barry,

The basic algorithm was developed for the KAT2, but it has morphed into several 
variations for our different tuners, including the T1, 
KAT1/2/3/3A/100/500/1500, and KXAT1/2/3/100. It's all about "pruning the search 
tree," to borrow a term from game theory.

73,
Wayne
N6KR


> On Apr 7, 2019, at 3:14 PM, Barry  wrote:
> 
> Wayne,
>Is that same algorithm and code in the KX3 and K3s??
> 
> 73,
> Barry
> K3NDM
> 
> -- Original Message --
> From: "Wayne Burdick" 
> To: "Dr. William J. Schmidt" 
> Cc: "Elecraft Reflector" 
> Sent: 4/7/2019 12:32:03 PM
> Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ
> 
>>> On Apr 7, 2019, at 9:15 AM, Dr. William J. Schmidt  
>>> wrote:
>>> 
>>> There isn't really much in the way of smarts on the clone board.  It's 
>>> simply the tuner elements (coils and capacitors), a few relays, the relay 
>>> driver chips, and gas tubes.  The actual tuning smarts comes from elsewhere 
>>> within the K3.  This isn’t much of a stretch for a clone.
>>> 
>> 
>> 
>> That's correct. The heart of any binary-weighted L-network ATU is in the 
>> firmware, which we've been improving since I first wrote the code for the 
>> KAT2. The latest incarnation of this code is in the KAT1500, the ATU 
>> included in the KPA1500 amp. My colleague K6KR has done a great job of 
>> tweaking the algorithm to eek out that last tenth of an SWR unit on every 
>> match.
>> 
>> Wayne
>> N6KR


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Re: [Elecraft] K3 and Winmore

[Don Wilhelm]

Jay,

Set the audio level on transmit so you have 4 bars solid and the 5th bar 
flashing.


There is a document on my website www.w3fpr.com that may help.  Scroll 
the left column to the last entry and click to view the document.


73,
Don W3FPR

On 4/7/2019 7:03 PM, JAY wrote:

Good afternoon one and all.
I am trying to set up my K3 to use Winlink HF  I am able to RX but unable
to connect. I have tried all the possible settings with no luck.
This OM is missing something.
I have been able to TX WSPR and FT8
I know I am missing a setting of some thought.
Any help would be deeply appreciated.
In advance THANKS to all.

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[Elecraft] K3 and Winmore

[JAY]

Good afternoon one and all.
I am trying to set up my K3 to use Winlink HF  I am able to RX but unable
to connect. I have tried all the possible settings with no luck.
This OM is missing something.
I have been able to TX WSPR and FT8
I know I am missing a setting of some thought.
Any help would be deeply appreciated.
In advance THANKS to all.

-- 
73

KI4TXP  JAY
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[Elecraft] MFJ

[Bill Levy]

I am 71.
Hamming since early teen. 
Consider MFJ below par. 
You get what you pay for. 
Stay away from junk. 
Bill N2WL
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[Elecraft] T1 aznd LP-PAN Sold

[EricJ]

The T1 and LP-PAN have been sold.

XG3 still available.

Thanks to Elecraft reflector for making this possible.

Eric KE6US

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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Barry]

Wayne,
Is that same algorithm and code in the KX3 and K3s??

73,
Barry
K3NDM

-- Original Message --
From: "Wayne Burdick" 
To: "Dr. William J. Schmidt" 
Cc: "Elecraft Reflector" 
Sent: 4/7/2019 12:32:03 PM
Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ


 On Apr 7, 2019, at 9:15 AM, Dr. William J. Schmidt  wrote:

 There isn't really much in the way of smarts on the clone board.  It's simply 
the tuner elements (coils and capacitors), a few relays, the relay driver 
chips, and gas tubes.  The actual tuning smarts comes from elsewhere within the 
K3.  This isn’t much of a stretch for a clone.




That's correct. The heart of any binary-weighted L-network ATU is in the 
firmware, which we've been improving since I first wrote the code for the KAT2. 
The latest incarnation of this code is in the KAT1500, the ATU included in the 
KPA1500 amp. My colleague K6KR has done a great job of tweaking the algorithm 
to eek out that last tenth of an SWR unit on every match.

Wayne
N6KR



 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Doug Person
 Sent: Sunday, April 7, 2019 11:00 AM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ

 MFJ has been a leader in automatic tuner technology for years. It was probably 
a very simple engineering process for them to use what they have to create a K3 
tuner. You may have a dislike of MFJ products. But, that doesn't preclude the 
fact that their tuners work very well. They have been selling the K3 tuner for 
years. It doesn't seem the least bit surprising given the modular nature of the 
K3 and the long history MFJ has with automatic tuner technology. Maybe it's 
actually a complement to Elecraft that MFJ takes the K3 so seriously.

 Doug --KJØF

 On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:

 Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table. Took
 one back to my seat to kill time.  Opened it up to the second page and
 in the lower left corner is a box-ad with the following:


 "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
 the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
 MFJ-950K3 is a direct plug-in PC board for the Elecraft
 K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic
 antenna tuner PC board features an L-Match design and can match SWR up
 to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna
 port, and a sub-rx SMA port.  All antenna ports are protected with gas
 discharge tubes.  Super sensitive relay allows excellent low current
 drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides
 right into the K3’s tuning board slot. Weighs less than 1/2 pound.
 Pick up this great accessory for your K3 today and save $$$!"


 What in the world is that all about?  What possible market are they
 shooting at?  Who would put anything "MFJ" in anything Elecraft?

 Someone enlighten me!  Did I sleep through April 1st?

 https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3

 73,

 Kent  K9ZTV




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Re: [Elecraft] KPA500 Clicks & Pops

[Bob McGraw K4TAX]

Come to think about it, I haven't heard mine click and pop in quite some 
time.  I doubt that it's seasonal, but that is an interesting twist.  I 
doubt that my room or the dormant equipment varies over +/- 2°F over any 
given 24 hr period.


73

Bob, K4TAX

On 4/7/2019 1:11 PM, Andy Durbin wrote:

This will only be of interest to a few KPA500 owners  - those who don't think 
loud clicks/ticks/pops are acceptable.

In the message below I reported that I had lost interest in my investigation 
because the click/ticks had stopped.  That message is dated October 2018.   
Late March the ticks came back and now, early April, they are back to the 
annoying level that I experienced in 2018.  What's different?  Room temperature 
and consequently the powered on but not transmitting temperature of the KPA500 
is much lower in the winter months.

Although I lost interest in the investigation I continued to record PA 
temperature, heat sink temperature, and Z bracket temperature for every 
transmission I made.  That's a lot of data but  differences between summer and 
winter operating conditions may be interesting.   I plan to pick a few mid 
winter samples to compare with a few peak summer samples.

Has anyone else who is annoyed by KPA500 click/ticks noticed any correlation 
with room temperature?

73,
Andy, k3wyc



From: ANDY DURBIN
Sent: Tuesday, October 16, 2018 6:52 AM
To: elecraft@mailman.qth.net
Subject: KPA500 Clicks & Pops


I found this quite annoying too.  My approach was to try to understand how the 
Z bracket temperature varied relative to the heat sink temperature.  I placed a 
thermistor on the front end of the Z bracket and another on the heat sink fin 
closest to the Z bracket.  I logged the standard PA temperature and these 
additional thermistor temperatures for every transmission I made (still do).   
I established baseline temperature characteristics and planned to use this data 
to see if any mods I made changed the characteristics.


Surprise!  -  When I though I had enough data to move on to the next step in 
the investigation it stopped clicking.


Adding the thermistors only required removal of the front panel and the Z 
bracket screws were no touched.   It continued to click after the thermistors 
were added and then stopped a few weeks later.


The data show the rapid change in temperature is at the PA sensor only.  The 
heat sink and Z bracket change much more slowly and never have a large 
temperature difference.  Their temperatures do cross over though.


One problem with temperature logging is that I had no data, except for my test 
notes , on the clicks themselves.  I had planned to added some inexpensive 
sound detection modules and add this data to the logger.  That's on hold until 
the clicks come back.


It's really nice not to have the amp click continuously on every FT8 
transmission.  I wish I knew what fixed it.


73,

Andy k3wyc
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Dave Cole (NK7Z)]

Actually keeping this thread open is a better thing...

It lets Elecraft users see what other options are available...

That said-- I know I would never add an MFJ item to my K3.  The fact 
Elecraft has allowed this thread to continue shows how open minded 
Elecraft is, and how sure of their product they are...


73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 4/7/19 11:47 AM, Wayne Burdick wrote:

Bill Frantz wrote:


  (I won't mention...


   too late!


the time I ran 100W through a T1 tuner. It wasn't for long and the tuner 
survived.)


Ouch. We did T1 tests at 50 W to make sure it could handle 20 W, and even that 
was an invitation-only event, with observers at a distance wearing safety 
goggles. How long it would survive a KPA1500 is left as an exercise for the 
reader. I'm imagining a soft blue glow from the toroids.

Wayne
N6KR


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[Elecraft] Elecraft SSB Net log for 4-7-2019

[Eric Lanzl]

Here is the log for today's SSB net. While there was considerable fading, we 
still had a good turnout for the net. 


Elecraft SSB Net 4-7-2019

WB9JNZ    Eric IL    K3   4017   Net Control

NC0JW  Jim  CO      KX3      1356   Relay station

WM6P   Steve   GA      K3S    11453   Relay station 

KS6F Guy CA      K3S     10605

K6FW    Frank   CA  K3S    11672

W1NGA AL    CO K3         5765

KI6UJH  Doug   CO   KX3/100  10710

KC7ZJI  Steve   CA   KX3  1525

W2RWA    Dick NY   K3    2603

W7QHD Kurt  AZ   K2/100  1538

W7REK     Glenn   AZ    K3     2843

W1DFB  Don AZ   K3     2937

AE6JV    Bill   CA  K3       6299

K6VWE  Stan MI   K3      650

K8NU     Carl OH  K3S     10996

NS7P Phil  OR  K3     1826 

K7JG John    WA  KX3       3519

K7SEN   Neil  AZ  K3          6331  Relay station

KL0RG   Kevin     AL  KX3    ?

KM6JUD Keith   CA  IC 7300

VE6BEX Tom      AB  TS 530

W4TYB   Peter    GA  KX2    ?  Buddy stick vertical 

N7BDL    Terry    AZ   K3S 10373
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Eric Swartz - WA6HHQ, Elecraft]

Folks, we exceeding the single topic limit number of posts and its also a long 
delayed repeat of a prior thread from over a year or two ago.

Let's close it in the interest of relieving email overload for our other 
readers. Feel free to search the nabble archive of the list for prior posts on 
this topic.

Its also outside of the list guidelines to criticize other manufacturer's 
products here.

73, 

Eric
Moderator, from time to time
elecraft.com
_..._



> On Apr 7, 2019, at 10:22 AM, Alan Bloom  wrote:
> 
> I've long had mixed feelings about MFJ.  They have some very
> interesting, innovative, and cost-competitive products.  However
> sometimes the quality isn't there.  For example I have an MFJ antenna
> analyzer that was intermittent until I fixed a poor ground connection. 
> I forget the details, but as I recall the problem was partly one of
> design. 
> 
> Alan N1AL 
> 
>> On 2019-04-07 09:28, Wayne Burdick wrote:
>> 
>> I've used many MFJ products and in have had very little trouble with any of 
>> them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
>> versatile and does the job. I've also used their manual tuners, antenna 
>> switches, and portable/mobile whips. They have a very comprehensive product 
>> line that's really unique in the industry.
>> 
>> That said, I do have some suggestions for MFJ's engineering team on how they 
>> might improve their ATU. 
>> 
>> Looking at the photo, I see that they used much smaller toroidal cores for 5 
>> of the 8 inductors in the L network. This could result in excessive heating, 
>> especially on the higher bands, at full power into a worst-case match. We 
>> specified T68 sized cores to remain conservative based on extensive testing. 
>> Also, if you click on the photo to see the details, you'll see what appears 
>> to be very inconsistent hand soldering of the SMD components. While this 
>> doesn't necessarily worsen performance or reliability, it should be done in 
>> a way that inspires confidence in the buyer. (Easy for me to say, of course. 
>> We have the luxury of mass-producing these assemblies using automated 
>> pick-and-place equipment at our fabricator in Monterey.)
>> 
>> Wayne
>> N6KR
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

Bill Frantz wrote:

>  (I won't mention...

  too late!

> the time I ran 100W through a T1 tuner. It wasn't for long and the tuner 
> survived.)

Ouch. We did T1 tests at 50 W to make sure it could handle 20 W, and even that 
was an invitation-only event, with observers at a distance wearing safety 
goggles. How long it would survive a KPA1500 is left as an exercise for the 
reader. I'm imagining a soft blue glow from the toroids.

Wayne
N6KR


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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Bill Frantz]

I had to re-solder the ground connection on the SO-239 connector 
on my MFJ antenna analyser. That's the only problem I've had 
with it. Getting a good connection on large chunks of metal is 
difficult, and takes a lot of heat.


I've always considered that the MFJ products meet their 
specifications, while the Elecraft ones exceed them. (I won't 
mention the time I ran 100W through a T1 tuner. It wasn't for 
long and the tuner survived.)


73 Bill AE6JV

On 4/7/19 at 9:28 AM, n...@elecraft.com (Wayne Burdick) wrote:

Also, if you click on the photo to see the details, you'll see 
what appears to be very inconsistent hand soldering of the SMD components.


---
Bill Frantz| If the site is supported by  | Periwinkle
(408)356-8506  | ads, you are the product.| 16345 
Englewood Ave
www.pwpconsult.com |  | Los Gatos, 
CA 95032


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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

Correct.

Wayne


> On Apr 7, 2019, at 11:32 AM, hawley, charles j jr  
> wrote:
> 
> I take it this is a KAT3 clone, not a KAT3A improved version.
> 
> Chuck Hawley
>  c-haw...@illinois.edu
>   
>  Amateur Radio, KE9UW
>  aka Jack, BMW Motorcycles  
> 
> From: elecraft-boun...@mailman.qth.net  on 
> behalf of Wayne Burdick 
> Sent: Sunday, April 7, 2019 11:28 AM
> To: Doug Person
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ
>  
> I've used many MFJ products and in have had very little trouble with any of 
> them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
> versatile and does the job. I've also used their manual tuners, antenna 
> switches, and portable/mobile whips. They have a very comprehensive product 
> line that's really unique in the industry.
> 
> That said, I do have some suggestions for MFJ's engineering team on how they 
> might improve their ATU. 
> 
> Looking at the photo, I see that they used much smaller toroidal cores for 5 
> of the 8 inductors in the L network. This could result in excessive heating, 
> especially on the higher bands, at full power into a worst-case match. We 
> specified T68 sized cores to remain conservative based on extensive testing. 
> Also, if you click on the photo to see the details, you'll see what appears 
> to be very inconsistent hand soldering of the SMD components. While this 
> doesn't necessarily worsen performance or reliability, it should be done in a 
> way that inspires confidence in the buyer. (Easy for me to say, of course. We 
> have the luxury of mass-producing these assemblies using automated 
> pick-and-place equipment at our fabricator in Monterey.)
> 
> Wayne
> N6KR
> 
> 
> 
> > On Apr 7, 2019, at 9:00 AM, Doug Person  wrote:
> > 
> > MFJ has been a leader in automatic tuner technology for years. It was 
> > probably a very simple engineering process for them to use what they have 
> > to create a K3 tuner. You may have a dislike of MFJ products. But, that 
> > doesn't preclude the fact that their tuners work very well. They have been 
> > selling the K3 tuner for years. It doesn't seem the least bit surprising 
> > given the modular nature of the K3 and the long history MFJ has with 
> > automatic tuner technology. Maybe it's actually a complement to Elecraft 
> > that MFJ takes the K3 so seriously.
> > 
> > Doug --KJØF
> > 
> > On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
> >> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took 
> >> one back to my seat to kill time.  Opened it up to the second page and in 
> >> the lower left corner is a box-ad with the following:
> >> 
> >> 
> >> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of the 
> >> KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
> >> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 100 
> >> Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board 
> >> features an L-Match design and can match SWR up to 10:1. It handles 100 
> >> Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA port. 
> >>  All antenna ports are protected with gas discharge tubes.  Super 
> >> sensitive relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 
> >> 1/2H x 1 1/4D inches and easily slides right into the K3’s tuning board 
> >> slot. Weighs less than 1/2 pound.  Pick up this great accessory for your 
> >> K3 today and save $$$!"
> >> 
> >> 
> >> What in the world is that all about?  What possible market are they 
> >> shooting at?  Who would put anything "MFJ" in anything Elecraft?
> >> 
> >> Someone enlighten me!  Did I sleep through April 1st?
> >> 
> >> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> >> 
> >> 73,
> >> 
> >> Kent  K9ZTV
> 
> 
> 
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[hawley, charles j jr]

I take it this is a KAT3 clone, not a KAT3A improved version.

Chuck Hawley
 c-haw...@illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles


From: elecraft-boun...@mailman.qth.net  on 
behalf of Wayne Burdick 
Sent: Sunday, April 7, 2019 11:28 AM
To: Doug Person
Cc: Elecraft Reflector
Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ

I've used many MFJ products and in have had very little trouble with any of 
them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
versatile and does the job. I've also used their manual tuners, antenna 
switches, and portable/mobile whips. They have a very comprehensive product 
line that's really unique in the industry.

That said, I do have some suggestions for MFJ's engineering team on how they 
might improve their ATU.

Looking at the photo, I see that they used much smaller toroidal cores for 5 of 
the 8 inductors in the L network. This could result in excessive heating, 
especially on the higher bands, at full power into a worst-case match. We 
specified T68 sized cores to remain conservative based on extensive testing. 
Also, if you click on the photo to see the details, you'll see what appears to 
be very inconsistent hand soldering of the SMD components. While this doesn't 
necessarily worsen performance or reliability, it should be done in a way that 
inspires confidence in the buyer. (Easy for me to say, of course. We have the 
luxury of mass-producing these assemblies using automated pick-and-place 
equipment at our fabricator in Monterey.)

Wayne
N6KR



> On Apr 7, 2019, at 9:00 AM, Doug Person  wrote:
>
> MFJ has been a leader in automatic tuner technology for years. It was 
> probably a very simple engineering process for them to use what they have to 
> create a K3 tuner. You may have a dislike of MFJ products. But, that doesn't 
> preclude the fact that their tuners work very well. They have been selling 
> the K3 tuner for years. It doesn't seem the least bit surprising given the 
> modular nature of the K3 and the long history MFJ has with automatic tuner 
> technology. Maybe it's actually a complement to Elecraft that MFJ takes the 
> K3 so seriously.
>
> Doug --KJØF
>
> On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
>> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took one 
>> back to my seat to kill time.  Opened it up to the second page and in the 
>> lower left corner is a box-ad with the following:
>>
>>
>> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of the 
>> KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
>> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 100 
>> Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board 
>> features an L-Match design and can match SWR up to 10:1. It handles 100 
>> Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA port.  
>> All antenna ports are protected with gas discharge tubes.  Super sensitive 
>> relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D 
>> inches and easily slides right into the K3’s tuning board slot. Weighs less 
>> than 1/2 pound.  Pick up this great accessory for your K3 today and save 
>> $$$!"
>>
>>
>> What in the world is that all about?  What possible market are they shooting 
>> at?  Who would put anything "MFJ" in anything Elecraft?
>>
>> Someone enlighten me!  Did I sleep through April 1st?
>>
>> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
>>
>> 73,
>>
>> Kent  K9ZTV



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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[hbjr]

Somebody pls close this thread!

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of W2xj
Sent: Sunday, April 7, 2019 2:22 PM
To: Alan Bloom 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ

Mighty fine junk

Sent from my iPhone

> On Apr 7, 2019, at 10:22, Alan Bloom  wrote:
> 
> I've long had mixed feelings about MFJ.  They have some very 
> interesting, innovative, and cost-competitive products.  However 
> sometimes the quality isn't there.  For example I have an MFJ antenna 
> analyzer that was intermittent until I fixed a poor ground connection.
> I forget the details, but as I recall the problem was partly one of 
> design.
> 
> Alan N1AL
> 
>> On 2019-04-07 09:28, Wayne Burdick wrote:
>> 
>> I've used many MFJ products and in have had very little trouble with any
of them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's
versatile and does the job. I've also used their manual tuners, antenna
switches, and portable/mobile whips. They have a very comprehensive product
line that's really unique in the industry.
>> 
>> That said, I do have some suggestions for MFJ's engineering team on how
they might improve their ATU. 
>> 
>> Looking at the photo, I see that they used much smaller toroidal 
>> cores for 5 of the 8 inductors in the L network. This could result in 
>> excessive heating, especially on the higher bands, at full power into 
>> a worst-case match. We specified T68 sized cores to remain 
>> conservative based on extensive testing. Also, if you click on the 
>> photo to see the details, you'll see what appears to be very 
>> inconsistent hand soldering of the SMD components. While this doesn't 
>> necessarily worsen performance or reliability, it should be done in a 
>> way that inspires confidence in the buyer. (Easy for me to say, of 
>> course. We have the luxury of mass-producing these assemblies using 
>> automated pick-and-place equipment at our fabricator in Monterey.)
>> 
>> Wayne
>> N6KR
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[W2xj]

Mighty fine junk

Sent from my iPhone

> On Apr 7, 2019, at 10:22, Alan Bloom  wrote:
> 
> I've long had mixed feelings about MFJ.  They have some very
> interesting, innovative, and cost-competitive products.  However
> sometimes the quality isn't there.  For example I have an MFJ antenna
> analyzer that was intermittent until I fixed a poor ground connection. 
> I forget the details, but as I recall the problem was partly one of
> design. 
> 
> Alan N1AL 
> 
>> On 2019-04-07 09:28, Wayne Burdick wrote:
>> 
>> I've used many MFJ products and in have had very little trouble with any of 
>> them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
>> versatile and does the job. I've also used their manual tuners, antenna 
>> switches, and portable/mobile whips. They have a very comprehensive product 
>> line that's really unique in the industry.
>> 
>> That said, I do have some suggestions for MFJ's engineering team on how they 
>> might improve their ATU. 
>> 
>> Looking at the photo, I see that they used much smaller toroidal cores for 5 
>> of the 8 inductors in the L network. This could result in excessive heating, 
>> especially on the higher bands, at full power into a worst-case match. We 
>> specified T68 sized cores to remain conservative based on extensive testing. 
>> Also, if you click on the photo to see the details, you'll see what appears 
>> to be very inconsistent hand soldering of the SMD components. While this 
>> doesn't necessarily worsen performance or reliability, it should be done in 
>> a way that inspires confidence in the buyer. (Easy for me to say, of course. 
>> We have the luxury of mass-producing these assemblies using automated 
>> pick-and-place equipment at our fabricator in Monterey.)
>> 
>> Wayne
>> N6KR
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[Elecraft] KPA500 Clicks & Pops

[Andy Durbin]

This will only be of interest to a few KPA500 owners  - those who don't think 
loud clicks/ticks/pops are acceptable.

In the message below I reported that I had lost interest in my investigation 
because the click/ticks had stopped.  That message is dated October 2018.   
Late March the ticks came back and now, early April, they are back to the 
annoying level that I experienced in 2018.  What's different?  Room temperature 
and consequently the powered on but not transmitting temperature of the KPA500 
is much lower in the winter months.

Although I lost interest in the investigation I continued to record PA 
temperature, heat sink temperature, and Z bracket temperature for every 
transmission I made.  That's a lot of data but  differences between summer and 
winter operating conditions may be interesting.   I plan to pick a few mid 
winter samples to compare with a few peak summer samples.

Has anyone else who is annoyed by KPA500 click/ticks noticed any correlation 
with room temperature?

73,
Andy, k3wyc



From: ANDY DURBIN
Sent: Tuesday, October 16, 2018 6:52 AM
To: elecraft@mailman.qth.net
Subject: KPA500 Clicks & Pops


I found this quite annoying too.  My approach was to try to understand how the 
Z bracket temperature varied relative to the heat sink temperature.  I placed a 
thermistor on the front end of the Z bracket and another on the heat sink fin 
closest to the Z bracket.  I logged the standard PA temperature and these 
additional thermistor temperatures for every transmission I made (still do).   
I established baseline temperature characteristics and planned to use this data 
to see if any mods I made changed the characteristics.


Surprise!  -  When I though I had enough data to move on to the next step in 
the investigation it stopped clicking.


Adding the thermistors only required removal of the front panel and the Z 
bracket screws were no touched.   It continued to click after the thermistors 
were added and then stopped a few weeks later.


The data show the rapid change in temperature is at the PA sensor only.  The 
heat sink and Z bracket change much more slowly and never have a large 
temperature difference.  Their temperatures do cross over though.


One problem with temperature logging is that I had no data, except for my test 
notes , on the clicks themselves.  I had planned to added some inexpensive 
sound detection modules and add this data to the logger.  That's on hold until 
the clicks come back.


It's really nice not to have the amp click continuously on every FT8 
transmission.  I wish I knew what fixed it.


73,

Andy k3wyc
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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

Agreed!

Wayne
N6KR


> On Apr 7, 2019, at 10:37 AM, donov...@starpower.net wrote:
> 
> Hi Wayne,
> 
> This repulsive thread need to be terminated immediately.  I’ve never seen 
> anything like it before on here.
> 
> 73
> Frank
> W3LPL



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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[donovanf]

Hi Wayne,

This repulsive thread need to be terminated immediately.  I’ve never seen 
anything like it before on here.

73
Frank
W3LPL

- Original Message -
From: Macy monkeys macymonk...@charter.net
To: elecraft@mailman.qth.net
Sent: Sun, 07 Apr 2019 13:30:51 -0400 (EDT)
Subject: Re: [Elecraft] OT:  BIZARRE OFFERING FROM MFJ

Ouch.

John K7FD

 On Apr 7, 2019, at 9:35 AM, Ken G Kopp kengk...@gmail.com wrote:
 
 Perhaps the matter stems from the nationality of MFJ's owner and a
 different set of values.
 
 K0PP
 
 On Sun, Apr 7, 2019, 10:28 Wayne Burdick n...@elecraft.com 
wrote:
 
 I've used many MFJ products and in have had very little trouble with 
any
 of them. For example, I make frequent use an MFJ-223 hand-held VNA -- 
it's
 versatile and does the job. I've also used their manual tuners, antenna
 switches, and portable/mobile whips. They have a very comprehensive 
product
 line that's really unique in the industry.
 
 That said, I do have some suggestions for MFJ's engineering team on how
 they might improve their ATU.
 
 Looking at the photo, I see that they used much smaller toroidal cores 
for
 5 of the 8 inductors in the L network. This could result in excessive
 heating, especially on the higher bands, at full power into a 
worst-case
 match. We specified T68 sized cores to remain conservative based on
 extensive testing. Also, if you click on the photo to see the details,
 you'll see what appears to be very inconsistent hand soldering of the 
SMD
 components. While this doesn't necessarily worsen performance or
 reliability, it should be done in a way that inspires confidence in the
 buyer. (Easy for me to say, of course. We have the luxury of 
mass-producing
 these assemblies using automated pick-and-place equipment at our 
fabricator
 in Monterey.)
 
 Wayne
 N6KR
 
 
 
 On Apr 7, 2019, at 9:00 AM, Doug Person d...@kj0f.com 
wrote:
 
 MFJ has been a leader in automatic tuner technology for years. It 
was
 probably a very simple engineering process for them to use what they 
have
 to create a K3 tuner. You may have a dislike of MFJ products. But, that
 doesn't preclude the fact that their tuners work very well. They have 
been
 selling the K3 tuner for years. It doesn't seem the least bit 
surprising
 given the modular nature of the K3 and the long history MFJ has with
 automatic tuner technology. Maybe it's actually a complement to 
Elecraft
 that MFJ takes the K3 so seriously.
 
 Doug --KJØF
 
 On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
 Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a 
table.  Took
 one back to my seat to kill time.  Opened it up to the second page and 
in
 the lower left corner is a box-ad with the following:
 
 
 "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super 
clone of
 the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
 MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 
100
 Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC 
board
 features an L-Match design and can match SWR up to 10:1. It handles 100
 Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA 
port.
 All antenna ports are protected with gas discharge tubes.  Super 
sensitive
 relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1
 1/4D inches and easily slides right into the K3’s tuning board slot. 
Weighs
 less than 1/2 pound.  Pick up this great accessory for your K3 today 
and
 save $$$!"
 
 
 What in the world is that all about?  What possible market are 
they
 shooting at?  Who would put anything "MFJ" in anything Elecraft?
 
 Someone enlighten me!  Did I sleep through April 1st?
 
 https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
 
 73,
 
 Kent  K9ZTV
 
 
 
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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Macy monkeys]

Ouch.

John K7FD

> On Apr 7, 2019, at 9:35 AM, Ken G Kopp  wrote:
> 
> Perhaps the matter stems from the nationality of MFJ's owner and a
> different set of values.
> 
> K0PP
> 
>> On Sun, Apr 7, 2019, 10:28 Wayne Burdick  wrote:
>> 
>> I've used many MFJ products and in have had very little trouble with any
>> of them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's
>> versatile and does the job. I've also used their manual tuners, antenna
>> switches, and portable/mobile whips. They have a very comprehensive product
>> line that's really unique in the industry.
>> 
>> That said, I do have some suggestions for MFJ's engineering team on how
>> they might improve their ATU.
>> 
>> Looking at the photo, I see that they used much smaller toroidal cores for
>> 5 of the 8 inductors in the L network. This could result in excessive
>> heating, especially on the higher bands, at full power into a worst-case
>> match. We specified T68 sized cores to remain conservative based on
>> extensive testing. Also, if you click on the photo to see the details,
>> you'll see what appears to be very inconsistent hand soldering of the SMD
>> components. While this doesn't necessarily worsen performance or
>> reliability, it should be done in a way that inspires confidence in the
>> buyer. (Easy for me to say, of course. We have the luxury of mass-producing
>> these assemblies using automated pick-and-place equipment at our fabricator
>> in Monterey.)
>> 
>> Wayne
>> N6KR
>> 
>> 
>> 
>>> On Apr 7, 2019, at 9:00 AM, Doug Person  wrote:
>>> 
>>> MFJ has been a leader in automatic tuner technology for years. It was
>> probably a very simple engineering process for them to use what they have
>> to create a K3 tuner. You may have a dislike of MFJ products. But, that
>> doesn't preclude the fact that their tuners work very well. They have been
>> selling the K3 tuner for years. It doesn't seem the least bit surprising
>> given the modular nature of the K3 and the long history MFJ has with
>> automatic tuner technology. Maybe it's actually a complement to Elecraft
>> that MFJ takes the K3 so seriously.
>>> 
>>> Doug --KJØF
>>> 
 On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
 Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took
>> one back to my seat to kill time.  Opened it up to the second page and in
>> the lower left corner is a box-ad with the following:
 
 
 "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
>> the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
>> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 100
>> Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board
>> features an L-Match design and can match SWR up to 10:1. It handles 100
>> Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA port.
>> All antenna ports are protected with gas discharge tubes.  Super sensitive
>> relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1
>> 1/4D inches and easily slides right into the K3’s tuning board slot. Weighs
>> less than 1/2 pound.  Pick up this great accessory for your K3 today and
>> save $$$!"
 
 
 What in the world is that all about?  What possible market are they
>> shooting at?  Who would put anything "MFJ" in anything Elecraft?
 
 Someone enlighten me!  Did I sleep through April 1st?
 
 https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
 
 73,
 
 Kent  K9ZTV
>> 
>> 
>> 
>> __
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[K9ZTV]

Maybe because the discussion referenced what the clone referenced?

K9ZTV

> On Apr 7, 2019, at 11:43 AM, j...@kk9a.com wrote:
> 
> The K3 has been out of production for four years, why is the top of the line 
> Elecraft transceiver still commonly refereed to as a K3 and not a K3S?
> 
> John KK9A - PJ4R in last weekend's WPX where I used my K3S.
> 
> 
> Kent  K9ZTV wrote:
> 
> 
> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
> the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or
> 100 Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC
> board features an L-Match design and can match SWR up to 10:1. It
> handles 100 Watts.  The ATU PC board has a second antenna port, and a
> sub-rx SMA port.  All antenna ports are protected with gas discharge
> tubes.  Super sensitive relay allows excellent low current drain.
> MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides right into
> the K3’s tuning board slot. Weighs less than 1/2 pound.  Pick up this
> great accessory for your K3 today and save $$$!"
> 
> 
> What in the world is that all about?  What possible market are they
> shooting at?  Who would put anything "MFJ" in anything Elecraft?
> 
> 
> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> 
> 73,
> 
> Kent  K9ZTV
> 
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Alan Bloom]

I've long had mixed feelings about MFJ.  They have some very
interesting, innovative, and cost-competitive products.  However
sometimes the quality isn't there.  For example I have an MFJ antenna
analyzer that was intermittent until I fixed a poor ground connection. 
I forget the details, but as I recall the problem was partly one of
design. 

Alan N1AL 

On 2019-04-07 09:28, Wayne Burdick wrote:

> I've used many MFJ products and in have had very little trouble with any of 
> them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
> versatile and does the job. I've also used their manual tuners, antenna 
> switches, and portable/mobile whips. They have a very comprehensive product 
> line that's really unique in the industry.
> 
> That said, I do have some suggestions for MFJ's engineering team on how they 
> might improve their ATU. 
> 
> Looking at the photo, I see that they used much smaller toroidal cores for 5 
> of the 8 inductors in the L network. This could result in excessive heating, 
> especially on the higher bands, at full power into a worst-case match. We 
> specified T68 sized cores to remain conservative based on extensive testing. 
> Also, if you click on the photo to see the details, you'll see what appears 
> to be very inconsistent hand soldering of the SMD components. While this 
> doesn't necessarily worsen performance or reliability, it should be done in a 
> way that inspires confidence in the buyer. (Easy for me to say, of course. We 
> have the luxury of mass-producing these assemblies using automated 
> pick-and-place equipment at our fabricator in Monterey.)
> 
> Wayne
> N6KR
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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Buddy Brannan]

I met Mr. MFJ, K5FLU, once as well, at the 100th ARRL anniversary do. 
Wait…Think it was there, although it could have as easily been another time, 
like Hamcomm a bazillion years ago. Anyway, as others have said, a gentleman in 
very sense. Soft spoken, well spoken, as ‘American as you or I. Oh wait. … I’m 
also half Asian, on my mother’s side, so…umm...


Buddy Brannan, KB5ELV - Erie, PA
Email: bu...@brannan.name
Mobile: (814) 431-0962



> On Apr 7, 2019, at 1:17 PM, George  wrote:
> 
> Hi everyone,
> I had to jump in.  I’ve known Martin for over 40 years and he is a fine 
> Southern gentleman who received his M.S.E.E. from Mississippi State 
> University.  I too have an Asian heritage as my mother was Japanese.  I bet 
> you can’t guess what roots my father had.  We love our USA!
> 
> George O’Brien
> AB4FH
> BS Physics Clemson Univ.
> MS Physics Univ. Ala. In B’ham
> Captain in US Air Force during Vietnam Era
> First licensed as WN4PDQ in 1969
> 
> 
> From: Ben Hall
> Sent: Sunday, April 7, 2019 12:56 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ
> 
> On 4/7/2019 11:47 AM, Josh Fiden wrote:
>> Are you kidding? His *nationality* is American. 
> 
> Indeed, he is 100% American.  Watch the YouTube video where he gives a 
> tour of the factory if you have any doubt!  He talks about his ancestors 
> coming over to work on the railroads...and has a wonderful Southern accent.
> 
> thanks much and 73,
> ben, kd5byb
> 
> 
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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[George]

Hi everyone,
I had to jump in.  I’ve known Martin for over 40 years and he is a fine 
Southern gentleman who received his M.S.E.E. from Mississippi State University. 
 I too have an Asian heritage as my mother was Japanese.  I bet you can’t guess 
what roots my father had.  We love our USA!

George O’Brien
AB4FH
BS Physics Clemson Univ.
MS Physics Univ. Ala. In B’ham
Captain in US Air Force during Vietnam Era
First licensed as WN4PDQ in 1969


From: Ben Hall
Sent: Sunday, April 7, 2019 12:56 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

On 4/7/2019 11:47 AM, Josh Fiden wrote:
> Are you kidding? His *nationality* is American. 

Indeed, he is 100% American.  Watch the YouTube video where he gives a 
tour of the factory if you have any doubt!  He talks about his ancestors 
coming over to work on the railroads...and has a wonderful Southern accent.

thanks much and 73,
ben, kd5byb


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Re: [Elecraft] LP-PAN 2 Panadapter with Z10000 for K2

[EricJ]

Hi Paul,

I'm sorry. I haven't received any emails except this one. The LP-PAN is 
available. I'll hold it for you until you can make a decision.


Please let me know what you posted in the other emails so I can answer 
any questions.


Use this gmail address until I can figure out what happened with 
eric_c...@hotmail.com


Eric KE6US

On 4/7/2019 9:35 AM, Paul Gacek wrote:

Eric

I am interested and have emailed you a couple of times off list as you 
suggested.


If the items are sold please let me know.

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Apr 6, 2019, at 3:40 PM, EricJ > wrote:


Originally an LP-PAN, but upgraded to LP-PAN 2.
No extraneous holes or mods.

Includes:
LP-PAN 2
Z1 buffer amp optimized for K2
BNC-SMA cable to connect K2 to LP-PAN
Manual pdf's on DVD

Photos here:
https://photos.app.goo.gl/zRkmEw7V8ztjrALM8

See telepostinc.com for easy installation, current software and sound 
card recommendations.


$150 including priority mail shipping to US only.

Paypal preferred to email below. Ships immediately after payment is 
received.


Contact me off-list. Semi-active on this list for years. Current info 
at QRZ.com.


Eric KE6US
eric_c...@hotmail.com

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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

I've met Martin on several occasions. He's a gentleman and an entrepreneur with 
a long track record of serving the ham community. Can we just leave it at that? 

Thanks,
Wayne
N6KR

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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Ben Hall]

On 4/7/2019 11:47 AM, Josh Fiden wrote:
Are you kidding? His *nationality* is American. 


Indeed, he is 100% American.  Watch the YouTube video where he gives a 
tour of the factory if you have any doubt!  He talks about his ancestors 
coming over to work on the railroads...and has a wonderful Southern accent.


thanks much and 73,
ben, kd5byb


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Re: [Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Josh Fiden]

Are you kidding? His *nationality* is American. Unless I misunderstand, your 
stereotype comment is utterly offensive. 

https://en.m.wikipedia.org/wiki/Martin_F._Jue

...de W6XU

Sent from my mobile device

> On Apr 7, 2019, at 9:35 AM, Ken G Kopp  wrote:
> 
> Perhaps the matter stems from the nationality of MFJ's owner and a
> different set of values.
> 
> K0PP
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[Elecraft] BIZARRE OFFERING FROM MFJ

[john]

The K3 has been out of production for four years, why is the top of  
the line Elecraft transceiver still commonly refereed to as a K3 and  
not a K3S?


John KK9A - PJ4R in last weekend's WPX where I used my K3S.


Kent  K9ZTV wrote:


"MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or
100 Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC
board features an L-Match design and can match SWR up to 10:1. It
handles 100 Watts.  The ATU PC board has a second antenna port, and a
sub-rx SMA port.  All antenna ports are protected with gas discharge
tubes.  Super sensitive relay allows excellent low current drain.
MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides right into
the K3’s tuning board slot. Weighs less than 1/2 pound.  Pick up this
great accessory for your K3 today and save $$$!"


What in the world is that all about?  What possible market are they
shooting at?  Who would put anything "MFJ" in anything Elecraft?


https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3

73,

Kent  K9ZTV

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[Elecraft] OT: BIZARRE OFFERING FROM MFJ

[Ken G Kopp]

Perhaps the matter stems from the nationality of MFJ's owner and a
different set of values.

K0PP

On Sun, Apr 7, 2019, 10:28 Wayne Burdick  wrote:

> I've used many MFJ products and in have had very little trouble with any
> of them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's
> versatile and does the job. I've also used their manual tuners, antenna
> switches, and portable/mobile whips. They have a very comprehensive product
> line that's really unique in the industry.
>
> That said, I do have some suggestions for MFJ's engineering team on how
> they might improve their ATU.
>
> Looking at the photo, I see that they used much smaller toroidal cores for
> 5 of the 8 inductors in the L network. This could result in excessive
> heating, especially on the higher bands, at full power into a worst-case
> match. We specified T68 sized cores to remain conservative based on
> extensive testing. Also, if you click on the photo to see the details,
> you'll see what appears to be very inconsistent hand soldering of the SMD
> components. While this doesn't necessarily worsen performance or
> reliability, it should be done in a way that inspires confidence in the
> buyer. (Easy for me to say, of course. We have the luxury of mass-producing
> these assemblies using automated pick-and-place equipment at our fabricator
> in Monterey.)
>
> Wayne
> N6KR
>
>
>
> > On Apr 7, 2019, at 9:00 AM, Doug Person  wrote:
> >
> > MFJ has been a leader in automatic tuner technology for years. It was
> probably a very simple engineering process for them to use what they have
> to create a K3 tuner. You may have a dislike of MFJ products. But, that
> doesn't preclude the fact that their tuners work very well. They have been
> selling the K3 tuner for years. It doesn't seem the least bit surprising
> given the modular nature of the K3 and the long history MFJ has with
> automatic tuner technology. Maybe it's actually a complement to Elecraft
> that MFJ takes the K3 so seriously.
> >
> > Doug --KJØF
> >
> > On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
> >> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took
> one back to my seat to kill time.  Opened it up to the second page and in
> the lower left corner is a box-ad with the following:
> >>
> >>
> >> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
> the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 100
> Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board
> features an L-Match design and can match SWR up to 10:1. It handles 100
> Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA port.
> All antenna ports are protected with gas discharge tubes.  Super sensitive
> relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1
> 1/4D inches and easily slides right into the K3’s tuning board slot. Weighs
> less than 1/2 pound.  Pick up this great accessory for your K3 today and
> save $$$!"
> >>
> >>
> >> What in the world is that all about?  What possible market are they
> shooting at?  Who would put anything "MFJ" in anything Elecraft?
> >>
> >> Someone enlighten me!  Did I sleep through April 1st?
> >>
> >> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> >>
> >> 73,
> >>
> >> Kent  K9ZTV
>
>
>
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Re: [Elecraft] LP-PAN 2 Panadapter with Z10000 for K2

[Paul Gacek via Elecraft]

Eric

I am interested and have emailed you a couple of times off list as you 
suggested.

If the items are sold please let me know.

Paul
W6PNG/M0SNA
www.nomadic.blog 


> On Apr 6, 2019, at 3:40 PM, EricJ  wrote:
> 
> Originally an LP-PAN, but upgraded to LP-PAN 2.
> No extraneous holes or mods.
> 
> Includes:
> LP-PAN 2
> Z1 buffer amp optimized for K2
> BNC-SMA cable to connect K2 to LP-PAN
> Manual pdf's on DVD
> 
> Photos here:
> https://photos.app.goo.gl/zRkmEw7V8ztjrALM8
> 
> See telepostinc.com for easy installation, current software and sound card 
> recommendations.
> 
> $150 including priority mail shipping to US only.
> 
> Paypal preferred to email below. Ships immediately after payment is received.
> 
> Contact me off-list. Semi-active on this list for years. Current info at 
> QRZ.com.
> 
> Eric KE6US
> eric_c...@hotmail.com
> 
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

> On Apr 7, 2019, at 9:15 AM, Dr. William J. Schmidt  wrote:
> 
> There isn't really much in the way of smarts on the clone board.  It's simply 
> the tuner elements (coils and capacitors), a few relays, the relay driver 
> chips, and gas tubes.  The actual tuning smarts comes from elsewhere within 
> the K3.  This isn’t much of a stretch for a clone.
> 


That's correct. The heart of any binary-weighted L-network ATU is in the 
firmware, which we've been improving since I first wrote the code for the KAT2. 
The latest incarnation of this code is in the KAT1500, the ATU included in the 
KPA1500 amp. My colleague K6KR has done a great job of tweaking the algorithm 
to eek out that last tenth of an SWR unit on every match.

Wayne
N6KR

> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Doug Person
> Sent: Sunday, April 7, 2019 11:00 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ
> 
> MFJ has been a leader in automatic tuner technology for years. It was 
> probably a very simple engineering process for them to use what they have to 
> create a K3 tuner. You may have a dislike of MFJ products. But, that doesn't 
> preclude the fact that their tuners work very well. They have been selling 
> the K3 tuner for years. It doesn't seem the least bit surprising given the 
> modular nature of the K3 and the long history MFJ has with automatic tuner 
> technology. Maybe it's actually a complement to Elecraft that MFJ takes the 
> K3 so seriously.
> 
> Doug --KJØF
> 
> On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
>> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table. Took 
>> one back to my seat to kill time.  Opened it up to the second page and 
>> in the lower left corner is a box-ad with the following:
>> 
>> 
>> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of 
>> the KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
>> MFJ-950K3 is a direct plug-in PC board for the Elecraft
>> K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic 
>> antenna tuner PC board features an L-Match design and can match SWR up 
>> to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna 
>> port, and a sub-rx SMA port.  All antenna ports are protected with gas 
>> discharge tubes.  Super sensitive relay allows excellent low current 
>> drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides 
>> right into the K3’s tuning board slot. Weighs less than 1/2 pound.
>> Pick up this great accessory for your K3 today and save $$$!"
>> 
>> 
>> What in the world is that all about?  What possible market are they 
>> shooting at?  Who would put anything "MFJ" in anything Elecraft?
>> 
>> Someone enlighten me!  Did I sleep through April 1st?
>> 
>> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
>> 
>> 73,
>> 
>> Kent  K9ZTV



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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

I've used many MFJ products and in have had very little trouble with any of 
them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's 
versatile and does the job. I've also used their manual tuners, antenna 
switches, and portable/mobile whips. They have a very comprehensive product 
line that's really unique in the industry.

That said, I do have some suggestions for MFJ's engineering team on how they 
might improve their ATU. 

Looking at the photo, I see that they used much smaller toroidal cores for 5 of 
the 8 inductors in the L network. This could result in excessive heating, 
especially on the higher bands, at full power into a worst-case match. We 
specified T68 sized cores to remain conservative based on extensive testing. 
Also, if you click on the photo to see the details, you'll see what appears to 
be very inconsistent hand soldering of the SMD components. While this doesn't 
necessarily worsen performance or reliability, it should be done in a way that 
inspires confidence in the buyer. (Easy for me to say, of course. We have the 
luxury of mass-producing these assemblies using automated pick-and-place 
equipment at our fabricator in Monterey.)

Wayne
N6KR



> On Apr 7, 2019, at 9:00 AM, Doug Person  wrote:
> 
> MFJ has been a leader in automatic tuner technology for years. It was 
> probably a very simple engineering process for them to use what they have to 
> create a K3 tuner. You may have a dislike of MFJ products. But, that doesn't 
> preclude the fact that their tuners work very well. They have been selling 
> the K3 tuner for years. It doesn't seem the least bit surprising given the 
> modular nature of the K3 and the long history MFJ has with automatic tuner 
> technology. Maybe it's actually a complement to Elecraft that MFJ takes the 
> K3 so seriously.
> 
> Doug --KJØF
> 
> On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
>> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took one 
>> back to my seat to kill time.  Opened it up to the second page and in the 
>> lower left corner is a box-ad with the following:
>> 
>> 
>> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of the 
>> KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
>> MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 100 
>> Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board 
>> features an L-Match design and can match SWR up to 10:1. It handles 100 
>> Watts.  The ATU PC board has a second antenna port, and a sub-rx SMA port.  
>> All antenna ports are protected with gas discharge tubes.  Super sensitive 
>> relay allows excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D 
>> inches and easily slides right into the K3’s tuning board slot. Weighs less 
>> than 1/2 pound.  Pick up this great accessory for your K3 today and save 
>> $$$!"
>> 
>> 
>> What in the world is that all about?  What possible market are they shooting 
>> at?  Who would put anything "MFJ" in anything Elecraft?
>> 
>> Someone enlighten me!  Did I sleep through April 1st?
>> 
>> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
>> 
>> 73,
>> 
>> Kent  K9ZTV



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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[German Duran]

I need an automatic tuner antenna for an ACOM A1000 amplifier. Does anyone
know of any brand or dealer that sells this antenna tuner? Will MFJ release
an automatic tuner antenna for 1000 watts? I hope some guidance response.
Thank you.
Dr. Germán Durán HK3J. Bogota Colombia
Internist and Nephrologist and devoted ham.

El dom., 7 abr. 2019 a las 11:15, Dr. William J. Schmidt (<
b...@wjschmidt.com>) escribió:

> There isn't really much in the way of smarts on the clone board.  It's
> simply the tuner elements (coils and capacitors), a few relays, the relay
> driver chips, and gas tubes.  The actual tuning smarts comes from elsewhere
> within the K3.  This isn’t much of a stretch for a clone.
>
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net [mailto:
> elecraft-boun...@mailman.qth.net] On Behalf Of Doug Person
> Sent: Sunday, April 7, 2019 11:00 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ
>
> MFJ has been a leader in automatic tuner technology for years. It was
> probably a very simple engineering process for them to use what they have
> to create a K3 tuner. You may have a dislike of MFJ products. But, that
> doesn't preclude the fact that their tuners work very well. They have been
> selling the K3 tuner for years. It doesn't seem the least bit surprising
> given the modular nature of the K3 and the long history MFJ has with
> automatic tuner technology. Maybe it's actually a complement to Elecraft
> that MFJ takes the K3 so seriously.
>
> Doug --KJØF
>
> On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
> > Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table. Took
> > one back to my seat to kill time.  Opened it up to the second page and
> > in the lower left corner is a box-ad with the following:
> >
> >
> > "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
> > the KAT3 optional tuning board for the superb Elecraft K3 transceiver.
> > MFJ-950K3 is a direct plug-in PC board for the Elecraft
> > K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic
> > antenna tuner PC board features an L-Match design and can match SWR up
> > to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna
> > port, and a sub-rx SMA port.  All antenna ports are protected with gas
> > discharge tubes.  Super sensitive relay allows excellent low current
> > drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides
> > right into the K3’s tuning board slot. Weighs less than 1/2 pound.
> > Pick up this great accessory for your K3 today and save $$$!"
> >
> >
> > What in the world is that all about?  What possible market are they
> > shooting at?  Who would put anything "MFJ" in anything Elecraft?
> >
> > Someone enlighten me!  Did I sleep through April 1st?
> >
> > https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> >
> > 73,
> >
> > Kent  K9ZTV
> >
> >
> >
> >
> >
> > ---
> > This email has been checked for viruses by AVG.
> > https://www.avg.com
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft@mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net Please help support this email
> > list: http://www.qsl.net/donate.html
>
> --
> 73 de Doug -- KJ0F
>
> __
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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Dr. William J. Schmidt]

There isn't really much in the way of smarts on the clone board.  It's simply 
the tuner elements (coils and capacitors), a few relays, the relay driver 
chips, and gas tubes.  The actual tuning smarts comes from elsewhere within the 
K3.  This isn’t much of a stretch for a clone.


-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Doug Person
Sent: Sunday, April 7, 2019 11:00 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ

MFJ has been a leader in automatic tuner technology for years. It was probably 
a very simple engineering process for them to use what they have to create a K3 
tuner. You may have a dislike of MFJ products. But, that doesn't preclude the 
fact that their tuners work very well. They have been selling the K3 tuner for 
years. It doesn't seem the least bit surprising given the modular nature of the 
K3 and the long history MFJ has with automatic tuner technology. Maybe it's 
actually a complement to Elecraft that MFJ takes the K3 so seriously.

Doug --KJØF

On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table. Took 
> one back to my seat to kill time.  Opened it up to the second page and 
> in the lower left corner is a box-ad with the following:
>
>
> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of 
> the KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
> MFJ-950K3 is a direct plug-in PC board for the Elecraft
> K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic 
> antenna tuner PC board features an L-Match design and can match SWR up 
> to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna 
> port, and a sub-rx SMA port.  All antenna ports are protected with gas 
> discharge tubes.  Super sensitive relay allows excellent low current 
> drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides 
> right into the K3’s tuning board slot. Weighs less than 1/2 pound.
> Pick up this great accessory for your K3 today and save $$$!"
>
>
> What in the world is that all about?  What possible market are they 
> shooting at?  Who would put anything "MFJ" in anything Elecraft?
>
> Someone enlighten me!  Did I sleep through April 1st?
>
> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
>
> 73,
>
> Kent  K9ZTV
>
>
>
>
>
> ---
> This email has been checked for viruses by AVG.
> https://www.avg.com
> __
> Elecraft mailing list
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> list: http://www.qsl.net/donate.html

--
73 de Doug -- KJ0F

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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Ken G Kopp]

Wonder if it's held in the K3 with hot glue like they use to hold the panel
meters in their antenna tuners  have seen this in a tuner purchased by
a friend.

73 !

K0PP

On Sun, Apr 7, 2019, 10:01 Doug Person  wrote:

> MFJ has been a leader in automatic tuner technology for years. It was
> probably a very simple engineering process for them to use what they
> have to create a K3 tuner. You may have a dislike of MFJ products. But,
> that doesn't preclude the fact that their tuners work very well. They
> have been selling the K3 tuner for years. It doesn't seem the least bit
> surprising given the modular nature of the K3 and the long history MFJ
> has with automatic tuner technology. Maybe it's actually a complement to
> Elecraft that MFJ takes the K3 so seriously.
>
> Doug --KJØF
>
> On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
> > Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.
> > Took one back to my seat to kill time.  Opened it up to the second
> > page and in the lower left corner is a box-ad with the following:
> >
> >
> > "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of
> > the KAT3 optional tuning board for the superb Elecraft K3
> > transceiver.  MFJ-950K3 is a direct plug-in PC board for the Elecraft
> > K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic
> > antenna tuner PC board features an L-Match design and can match SWR up
> > to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna
> > port, and a sub-rx SMA port.  All antenna ports are protected with gas
> > discharge tubes.  Super sensitive relay allows excellent low current
> > drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides
> > right into the K3’s tuning board slot. Weighs less than 1/2 pound.
> > Pick up this great accessory for your K3 today and save $$$!"
> >
> >
> > What in the world is that all about?  What possible market are they
> > shooting at?  Who would put anything "MFJ" in anything Elecraft?
> >
> > Someone enlighten me!  Did I sleep through April 1st?
> >
> > https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> >
> > 73,
> >
> > Kent  K9ZTV
> >
> >
> >
> >
> >
> > ---
> > This email has been checked for viruses by AVG.
> > https://www.avg.com
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
> --
> 73 de Doug -- KJ0F
>
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Re: [Elecraft] [K2] ALC and power control on 40m SSB in K2/100

[g0kla]

This is an old thread, but is something that I have struggled with on my own
K2.  I also had some RF feedback that was mixed with this, but I have cured
that.

So now I am left with the very similar symptoms where there are too many ALC
lights lit for 40m and it overdrives my KPA500.  I had to play with SSBA,
which I would set to 1 on 40m and 2 on 20m.  But even with SSBA set to 1 I
get much to much power on 40m for the amplifier.  I am using the MH2 mic.

I went through the checks.  I have the new PA.  There are only 1-2 ALC bars
lit on 20m and 15m.  There are typically 7 lit on 40m.

With SSBA set to 1 the voltage at KSB2 U1 pin 10 was not near zero.  It was
2.5V.  I checked the values and soldering of R14 and R15 and all looked ok. 
As were the other components listed.

Thinking that the incorrect voltage means that I should change the component
values I updated R9 to 15k and added a 1k between the base of Q1 and P1 pin
6.  The voltage is now near zero, but it has not improved things.

I still need to use SSBA 2 for 20m otherwise the drive is low.  But SSBA 1
on 40m has too much drive.  As soon as the KPA100 clicks in (as I turn from
10-11Watts) the amp is over driven.

Any suggestions?

73
Chris
ac2cz / g0kla





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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Doug Person]

MFJ has been a leader in automatic tuner technology for years. It was 
probably a very simple engineering process for them to use what they 
have to create a K3 tuner. You may have a dislike of MFJ products. But, 
that doesn't preclude the fact that their tuners work very well. They 
have been selling the K3 tuner for years. It doesn't seem the least bit 
surprising given the modular nature of the K3 and the long history MFJ 
has with automatic tuner technology. Maybe it's actually a complement to 
Elecraft that MFJ takes the K3 so seriously.


Doug --KJØF

On 4/7/2019 10:26 AM, KENT TRIMBLE wrote:
Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  
Took one back to my seat to kill time.  Opened it up to the second 
page and in the lower left corner is a box-ad with the following:



"MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of 
the KAT3 optional tuning board for the superb Elecraft K3 
transceiver.  MFJ-950K3 is a direct plug-in PC board for the Elecraft 
K3 10 Watt or 100 Watt model. Covers 1.8 to 54 MHz.  This automatic 
antenna tuner PC board features an L-Match design and can match SWR up 
to 10:1. It handles 100 Watts.  The ATU PC board has a second antenna 
port, and a sub-rx SMA port.  All antenna ports are protected with gas 
discharge tubes.  Super sensitive relay allows excellent low current 
drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides 
right into the K3’s tuning board slot. Weighs less than 1/2 pound.  
Pick up this great accessory for your K3 today and save $$$!"



What in the world is that all about?  What possible market are they 
shooting at?  Who would put anything "MFJ" in anything Elecraft?


Someone enlighten me!  Did I sleep through April 1st?

https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3

73,

Kent  K9ZTV





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--
73 de Doug -- KJ0F

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Re: [Elecraft] BIZARRE OFFERING FROM MFJ

[Wayne Burdick]

I'll be keeping my K3S 100% stock, thank you.

Wayne
N6KR

> On Apr 7, 2019, at 8:26 AM, KENT TRIMBLE  wrote:
> 
> Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took one 
> back to my seat to kill time.  Opened it up to the second page and in the 
> lower left corner is a box-ad with the following:
> 
> 
> "MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of the 
> KAT3 optional tuning board for the superb Elecraft K3 transceiver.  MFJ-950K3 
> is a direct plug-in PC board for the Elecraft K3 10 Watt or 100 Watt model. 
> Covers 1.8 to 54 MHz.  This automatic antenna tuner PC board features an 
> L-Match design and can match SWR up to 10:1. It handles 100 Watts.  The ATU 
> PC board has a second antenna port, and a sub-rx SMA port.  All antenna ports 
> are protected with gas discharge tubes.  Super sensitive relay allows 
> excellent low current drain.  MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and 
> easily slides right into the K3’s tuning board slot. Weighs less than 1/2 
> pound.  Pick up this great accessory for your K3 today and save $$$!"
> 
> 
> What in the world is that all about?  What possible market are they shooting 
> at?  Who would put anything "MFJ" in anything Elecraft?
> 
> Someone enlighten me!  Did I sleep through April 1st?
> 
> https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3
> 
> 73,
> 
> Kent  K9ZTV




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[Elecraft] BIZARRE OFFERING FROM MFJ

[KENT TRIMBLE]

Ozarkcon yesterday. Break-time.  Pile of MFJ catalogs on a table.  Took 
one back to my seat to kill time.  Opened it up to the second page and 
in the lower left corner is a box-ad with the following:



"MFJ ATU PC Board for Elecraft K-3 Rig.  MFJ-950K3 is a super clone of 
the KAT3 optional tuning board for the superb Elecraft K3 transceiver.  
MFJ-950K3 is a direct plug-in PC board for the Elecraft K3 10 Watt or 
100 Watt model. Covers 1.8 to 54 MHz.  This automatic antenna tuner PC 
board features an L-Match design and can match SWR up to 10:1. It 
handles 100 Watts.  The ATU PC board has a second antenna port, and a 
sub-rx SMA port.  All antenna ports are protected with gas discharge 
tubes.  Super sensitive relay allows excellent low current drain.  
MFJ-950K3 is 4W x 3 1/2H x 1 1/4D inches and easily slides right into 
the K3’s tuning board slot. Weighs less than 1/2 pound.  Pick up this 
great accessory for your K3 today and save $$$!"



What in the world is that all about?  What possible market are they 
shooting at?  Who would put anything "MFJ" in anything Elecraft?


Someone enlighten me!  Did I sleep through April 1st?

https://www.mfjenterprises.com/Product.php?productid=MFJ-950K3

73,

Kent  K9ZTV





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[Elecraft] WTB: KAT500

[David Windisch]

Hello all concerned:
WTB: KAT500; pls reply off list, tks.
Brgds,
Dave, N3HE
9750-153-315 (read right to left ) or moc.rr.icnic.@1wjdivad   right
to left



-
Brgds,
Dave, N3HE
Cincinnati OH
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