Re: [Elecraft] OT James Clerk Maxwell

[Kevin McQuiggin]

It is also of value to read about Professor Oliver Heaviside, a less-heralded 
but brilliant mathematician and physicist who was able to simplify Maxwell’s 
very complex electromagnetic theory of about 30 equations down to a much more 
understandable set of 4 or 6 equations.  It is Heaviside’s re-interpretation 
and simplification of Maxwell’s original equations that are taught and used 
today.

There is an excellent book on Heaviside, who was a genius in his own right:

“The Forgotten Genius of Oliver Heaviside”, available on Amazon, see 
https://www.amazon.com/Forgotten-Genius-Oliver-Heaviside-Electrical-ebook/dp/B01N0S90BN/ref=sr_1_1?keywords=genius+heaviside=1585197188=8-1
 


Just in case anyone is looking for a good book in this time of self-isolation,.

73,

Kevin VE7ZD



> On Mar 25, 2020, at 8:01 PM, Dave Sublette  wrote:
> 
> A brief, but excellent video on you tube discusses Maxwell and his
> importance in history.  If you are not familiar with "The History Guy",
> this is an excellent way to become acquainted with him.
> 
> https://www.youtube.com/watch?v=NuWEqE4k230
> 
> 73,
> 
> Dave, K4TO
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Re: [Elecraft] XG8 Firmware Update

[Jim Rhodes]

Well, the utility and firmware file.

On Wed, Mar 25, 2020 at 8:27 PM (null) (null) via Elecraft <
elecraft@mailman.qth.net> wrote:

> With the exception of the USB cable do I need anything else to update the
> firmware on the XG8?
> 73,
> Bill KO4NR
>
> Sent from my iPhone
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-- 
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Re: [Elecraft] OT James Clerk Maxwell

[Clay Autery]

Awesome, thank you!

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(318) 518-1389

On 03/25/20 22:01, Dave Sublette wrote:

A brief, but excellent video on you tube discusses Maxwell and his
importance in history.  If you are not familiar with "The History Guy",
this is an excellent way to become acquainted with him.

https://www.youtube.com/watch?v=NuWEqE4k230

73,

Dave, K4TO

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[Elecraft] Usb-lsb audio tone - Mike iw3smr-Italy

[mic b]

Hi, I'm an OM from Udine, northern Italy.  I own a K3 and I noticed that
changing the mode from Usb to Lsb the audio tone varies slightly.  It's
normal?  The five-pole filter has the center frequency set correctly as per
the label.  Is it possible to vary the carrier frequency of the sidebands?
Thanks for the answers and greetings to all.  '73 de Mike iw3smr
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[Elecraft] OT James Clerk Maxwell

[Dave Sublette]

A brief, but excellent video on you tube discusses Maxwell and his
importance in history.  If you are not familiar with "The History Guy",
this is an excellent way to become acquainted with him.

https://www.youtube.com/watch?v=NuWEqE4k230

73,

Dave, K4TO
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Re: [Elecraft] KX3 Advice on removing front bezel for cleaning.

[Grant Youngman]

Check the assembly errata.  It’s corrected there.   Figure 16 is correct.

Grant NQ5T

> On Mar 25, 2020, at 9:41 PM, Mike Parkes  wrote:
> 
> Hello team Elecraft
> I have some minor dust intrusion into the KX3 behind the bezel and wanted
> to remove it and do some light cleaning. Is there anything to be aware of
> before removing the VFO knob and the bezel?
> 
> The assembly instructions say: "*Place the bezel on the front panel and
> secure it, and the CP board inside, as shown in Figure 14"*. (But figure 14
> shows* "Preparing the Rubber Washer for Mounting on the VFO B Encoder"*...
> is this meant to say Fig 16?) Fig 16 shows the bezel in place, I guess the
> bezel is being screwed into the CP board? I don't want to start into this
> and screw something up! Thanks for any tips if you have any.
> 
> 73's to Mike AB7RU
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[Elecraft] KX3 Advice on removing front bezel for cleaning.

[Mike Parkes]

Hello team Elecraft
I have some minor dust intrusion into the KX3 behind the bezel and wanted
to remove it and do some light cleaning. Is there anything to be aware of
before removing the VFO knob and the bezel?

The assembly instructions say: "*Place the bezel on the front panel and
secure it, and the CP board inside, as shown in Figure 14"*. (But figure 14
shows* "Preparing the Rubber Washer for Mounting on the VFO B Encoder"*...
is this meant to say Fig 16?) Fig 16 shows the bezel in place, I guess the
bezel is being screwed into the CP board? I don't want to start into this
and screw something up! Thanks for any tips if you have any.

73's to Mike AB7RU
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[Elecraft] XG8 Firmware Update

[(null) (null) via Elecraft]

With the exception of the USB cable do I need anything else to update the 
firmware on the XG8?
73,
Bill KO4NR 

Sent from my iPhone
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Re: [Elecraft] KX3 drift question

[KENT TRIMBLE]

I personally like free-spinning knobs on both VFOs, and I especially 
like the after-market weighted knobs that were available a few years 
ago.  I have them on both the K3 and KX3.


But dimpled knobs exhibit out-of-roundness since material has been 
removed to form the dimple.  When spun, such knobs will back-lash at the 
end of their travel.


My ultra sophisticated procedure for perfect adjustment is to increase 
the knob's resistance to spinning until there is no more back-lash as 
indicated on the frequency display set to the smallest Hertz.  The knob 
is still free-spinning but when it stops the frequency stops.


73,

Kent  K9ZTV




On 3/25/2020 10:00 AM, Eddy Avila wrote:

I solved my KX3 drift problem, it wasn't electrical but rather
mechanicalreading in the manual about the VFO I increased the
resistance to the knob spin and  *voila* no more drift! I really like
simple solutions to problems.

Thanks to all that offered advice, much appreciated.

73

k6sdw
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Re: [Elecraft] T/R switch for 2nd Receiver K3S

[Mark Musick]

This is what I use on all my receive antennas to protect the K3S sub-receiver 
and preamps.

https://www.dxengineering.com/parts/dxe-rg5000hd

ARRAY SOLUTIONS makes a similar device.

No need for slow relays or relay control cables.
I might add that K3LR uses this device to protect his contest station radios.

Mark, WB9CIF

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of John Simmons
Sent: Wednesday, March 25, 2020 15:34
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] T/R switch for 2nd Receiver K3S

Vern,

I did some research a while back, and came up with this:
https://toptendevices.com/products/ab-station-selector/
It has the required isolation.

-de John NI0K

VernonJ wrote on 3/25/2020 10:28 AM:
> I need a T/R switch for my second receiver which is using its own antenna.
> Looked at the MFJ, but I don't think it is what I want. I am currently 
> looking at this for a keying circuit:
> 
> I am looking at this for the relay circujit:
> 
> Does this look viable to protect my 2d receiver from damage. Any 
> suggestions appreciated.  Vern  K2VJK
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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> jasimm...@pinewooddata.com

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[Elecraft] Correction for the 3-22-2020 SSB Net

[Eric Lanzl]

I noticed that KC7NVE's information wass left out:  KC7NVE John WA KX3 1320 
Eric 
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[Elecraft] Elecraft SSB Net for March 22, 2020

[Eric Lanzl]

Here is the list of stations that checked in to last Sunday's 20 M. Net. We 
meet on Sundays at 1800 z on a frequency of 14.303.5. All are welcome. We also 
have a 40 m net which meets at 18:45 or after the 20m net on a frequency about 
7.280. Steve WM6P is the net control for this net. Thank you to all the relay 
stations that help during propagation that bounces over my qth or is just weak. 
I am now using a new auto spreadsheet auto fill program so I hope it formats 
OK.   Eric WB9JNZ. Best wishes to everyone and stay healthy. 



Call Name  State   Radio    Serial #  QRP   
Notes

WB9JNZ  Eric    IL    K3
 4017    NetControl 

NC0JW Jim    CO KX3  
1356     

KO5V    Jim    NM    K2/100    7225 
    

KB9AVO  Paul  IN   K3S   
11103       

W1NGA   Al   CO K3 
5765     

K7BRR  Bill AZ  K3/ K3S  
5545 / 10939     

N7BDL  Terry    AZ  K3S   
10373       

KS6F Guy   CA  K3S  
 11672       

N6PGQ    Bob   CA  K3 
5891     

NK9A    Stan  IL    Yaesu  
757       

WM6P Steve   GA K3/ K3S  1833 / 
11453     

K8NU   Carl   OH K3 
7976     

W5RG  Bob   FL   K3 
1440     

N4NRW   Roger   SC  K3 1318 
    

W7QHD   Kurt  AZ  K2/100 / Kx3 1538 / 8697  
      

W4DML   Doug    TN  K3 6433 
    

N0MPM  Mike IA   K3S   
10514       

K6SBA  David    CA  K3 
565       

KG5RDY   Dwight NM    Icom    7410  
       

KC7NVE          
    
   

K6VWE    Stan  MI  K3 
650       

WB3LGC  Steve   DE  KX3  3819   
      

KA6MOK John CA  K2 1251 
    

N8SBE  Dave MI  K3S   
11361       

KC1ACL    Steve   NM    KX3  10677  
     

KM6CR    John CA  KX2  725  
     

 
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Re: [Elecraft] T/R switch for 2nd Receiver K3S

[John Simmons]

Vern,

I did some research a while back, and came up with this:
https://toptendevices.com/products/ab-station-selector/
It has the required isolation.

-de John NI0K

VernonJ wrote on 3/25/2020 10:28 AM:

I need a T/R switch for my second receiver which is using its own antenna.
Looked at the MFJ, but I don't think it is what I want. I am currently
looking at this for a keying circuit:

I am looking at this for the relay circujit:

Does this look viable to protect my 2d receiver from damage. Any suggestions
appreciated.  Vern  K2VJK



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[Elecraft] T/R switch for 2nd Receiver K3S

[VernonJ]

I need a T/R switch for my second receiver which is using its own antenna.
Looked at the MFJ, but I don't think it is what I want. I am currently
looking at this for a keying circuit:
 
I am looking at this for the relay circujit:
 
Does this look viable to protect my 2d receiver from damage. Any suggestions
appreciated.  Vern  K2VJK



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Re: [Elecraft] A broken K3

[Martin Sole]

Hi David,

I had a couple of failures this past year on my early K3 s/n 298. It's 
been updated with new synths and a new KRX3A plus it was updated some 
years ago before I got it and has most of the factory mods, though not 
the gold pins. If you search the archive here on my callsign you can see 
what I posted. Briefly I had first a loss of TX and some months later a 
loss of RX and TX.


Both faults were traced to 0.1uF decoupling capacitors on the K3REF 
board going leaky and puling bias voltages down such that they would not 
switch the various circuits/signals.  In the first case it caused loss 
of the TX bias voltage so the diode switching was not working. In the 
second case it was causing loss of second L.O. injection which of course 
made for a rather quiet receiver as well as no transmit.


Good luck, for sure you can fix it or get it fixed.

73
Martin, HS0ZED






On 25/03/2020 21:49, David Olean wrote:
Hello Jack, I have responded to Keith and am following his directions. 
He had lots of good info for me to try, and I am grateful for that.


Dave, K1WHS

On 3/25/2020 5:48 AM, Jack Brindle wrote:

David;

Go back and re-read the message from Keith Trinity. Keith is one of 
the guys down in Watsonville and knows more about the K3 than just 
about anyone.


To put it another way, you were indeed contacted by Customer Support.

73!
Jack, W6FB



On Mar 24, 2020, at 7:46 PM, David Olean  wrote:

I swapped out the non working synthesizer with a good one I had 
removed for an upgrade. The new one did not work either, so it is 
something else. I tried calibrating both synthesizers and received 
an error message ERROR 00044 on both of them.  I have been trying to 
contact Elecraft support, but have no joy there yet.


I guess I need to study the schematics some more. I must be missing 
a voltage somewhere. I tried re seating the connectors on many of 
the boards including the front panel. No luck there either, but I 
will try again tomorrow and use some DE-OXIT.


73

Dave K1WHS

On 3/25/2020 2:14 AM, Wilson Lamb wrote:

Why wouldn't you change  the synth?
I wouldn't even think of troubleshooting such a complicated, but 
free, board!

A bad one will obviously shut down both RX and TX!
WL
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Re: [Elecraft] KX3 drift question

[Eddy Avila]

I solved my KX3 drift problem, it wasn't electrical but rather
mechanicalreading in the manual about the VFO I increased the
resistance to the knob spin and  *voila* no more drift! I really like
simple solutions to problems.

Thanks to all that offered advice, much appreciated.

73

k6sdw
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Re: [Elecraft] G5RV trivia

[Don Wilhelm]

Angel,

Actually it addresses link coupled tuners that with a tuned to resonance 
using a balanced tank circuit.  You can feed balanced lines from taps 
placed equally out from center on the both coils.  The center of the two 
coils is common (ground), and unbalanced loads can be fed between the 
tap on one coil and the common center connection.


The Johnson Matchbox is a bit different in that it uses a differential 
variable capacitor to adjust the electrical position of the coil taps.


73,
Don W3FPR

On 3/25/2020 10:32 AM, Angel Garcia wrote:

Don, is this comment about unbalanced vs balanced line tuners, or something
specific to use of a balanced line tuner?
Angel wa2vuy
A good link coupled antenna tuning unit can cover a large range (Johnson
Matchbox is one example), and has many benefits that can be used today,
but few know how to use it to advantage.


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Re: [Elecraft] A broken K3

[David Olean]

Hello Jack, I have responded to Keith and am following his directions. 
He had lots of good info for me to try, and I am grateful for that.


Dave, K1WHS

On 3/25/2020 5:48 AM, Jack Brindle wrote:

David;

Go back and re-read the message from Keith Trinity. Keith is one of the guys 
down in Watsonville and knows more about the K3 than just about anyone.

To put it another way, you were indeed contacted by Customer Support.

73!
Jack, W6FB



On Mar 24, 2020, at 7:46 PM, David Olean  wrote:

I swapped out the non working synthesizer with a good one I had removed for an 
upgrade. The new one did not work either, so it is something else. I tried 
calibrating both synthesizers and received an error message ERROR 00044 on both 
of them.  I have been trying to contact Elecraft support, but have no joy there 
yet.

I guess I need to study the schematics some more. I must be missing a voltage 
somewhere. I tried re seating the connectors on many of the boards including 
the front panel. No luck there either, but I will try again tomorrow and use 
some DE-OXIT.

73

Dave K1WHS

On 3/25/2020 2:14 AM, Wilson Lamb wrote:

Why wouldn't you change  the synth?
I wouldn't even think of troubleshooting such a complicated, but free, board!
A bad one will obviously shut down both RX and TX!
WL
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[Elecraft] G5RV trivia

[Angel Garcia]

Don, is this comment about unbalanced vs balanced line tuners, or something
specific to use of a balanced line tuner?
Angel wa2vuy
A good link coupled antenna tuning unit can cover a large range (Johnson
Matchbox is one example), and has many benefits that can be used today,
but few know how to use it to advantage.

73,
Don W3FPR
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