Re: [Elecraft] K3 PA to Motherboard Pin Connection Workaround Mod

[exbpi]

Thanks Alan and Ken, K6MR...have what I need from both. 

Great help...thank you

Mike
K7PI

-Original Message-
From: Alan - G4GNX  
Sent: Saturday, March 27, 2021 10:24 AM
To: ex...@comcast.net
Subject: Re: [Elecraft] K3 PA to Motherboard Pin Connection Workaround Mod

Is the attached what you're looking for?

73,

Alan. G4GNX


-- Original Message --
From: ex...@comcast.net
To: Elecraft@mailman.qth.net
Sent: 27/03/2021 16:16:27
Subject: [Elecraft] K3 PA to Motherboard Pin Connection Workaround Mod

>Will someone on the list who has the workaround mod supplied by 
>Elecraft Support to bypass or repair the pin connections of the PA to 
>motherboard on the K3 email them to me?
>
>
>
>Thanks
>
>
>
>Mike
>
>K7PI
>
>ex...@comcast.net 
>

__
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
Message delivered to arch...@mail-archive.com 

[Elecraft] K3 PA to Motherboard Pin Connection Workaround Mod

[exbpi]

Will someone on the list who has the workaround mod supplied by Elecraft
Support to bypass or repair the pin connections of the PA to motherboard on
the K3 email them to me?

 

Thanks

 

Mike

K7PI

ex...@comcast.net  

 

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] Big Knob Fail

[exbpi]

Kent,

I completely agree...I have had the CNC knobs on my K3 since purchased with no 
issue and tuning is a delight. I have the same knobs on all my S-Line equipment 
+ my 75A4 and a custom knob made for my Racal RA6790GM which has the smoothest 
tuning of any receiver I have owned (and I've had quite a few).

73 Mike
K7PI

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of K9ZTV
Sent: Wednesday, February 17, 2021 5:45 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Big Knob Fail

K3 serial number 21 (kit no. 1) has carried the 73cnc weighted knobs on both 
the main and sub VFOs for more than 13 years of nearly nightly use.  It has 
been the primary CW rig for 11 Field Days, numerous special events, and upwards 
of a dozen Boy Scout outings.  The knobs have been twirled by club members with 
heavy fists and kids with youthful exuberance.  Yet they continue to provide 
the smooth and silky feel characteristic of those weighted knobs used in high 
end receivers for nearly 100 years.

If the tuning shafts and encoders are in imminent danger of “angular momentum 
and torque” leading to premature wear, my K3 didn’t get the memo.

Such concerns about non-Elecraft accessories are usually conjectural in my 
opinion, if not plain nonsense.

73,

Kent  K9ZTV



> On Feb 17, 2021, at 3:37 PM, someone wrote:
> 
> One of the problems with the knobs is that sometimes people change out the 
> stock injected molded knob for a HEAVY machined knob. The mechanism inside 
> the radio is not built for this type of installation. A rapid spin with the 
> angular momentum and torque of the heavy knob will wear out the device.  This 
> will require taking the front panel off and replacing the component.

__
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 Message 
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] [K3] KAT3 not functioning on 6m

[exbpi]

Bill,

Why are you running split in WSJT? The only time you actually need split is 
when operating 2 different frequencies like working JA's on 160 when they used 
to be required to transmit on 1908 KHz and we transmitted on 1840 kHZ (they now 
can operate on 1840). Unless you are actually needing to receive on one 
frequency and transmit on another, set the radio configuration to "Fake It" 
instead of "split". That will keep your transmit frequency in the middle of 
your transmit bandpass. There is no actual frequency change in WSJT including 
DX expedition mode.

GL

Mike
K7PI

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Bill Coleman
Sent: Sunday, September 6, 2020 13:08
To: w4sc 
Cc: Elecraft 
Subject: Re: [Elecraft] [K3] KAT3 not functioning on 6m

OK, I figured this out, sort of.

Every time I’ve had trouble with the KAT3 not tuning, the K3 has been in split 
mode.

By taking the K3 out of split mode, I’m able to turn on 6m correctly.

Oddly, though, when I return to split mode, it still works. 

I’m not sure why I see this issue, but I’m glad I can work around it.

Split mode is often configured due to the WSJT-X settings, depending on the 
frequencies used.

> On Sep 5, 2020, at 9:01 PM, w4sc  wrote:
> 
> Bill,
>  
> I had an issue very similar.  The “Automatic TXGain” procedure is performed 
> at 52 MHz.  I was using a 50 ohm load attached, and at 50.125 the KAT3 have 
> trouble matching the load.  Also it appears there is not enough power out in 
> the lower part of the band for the SWR bridge to function.
>  
> Part of the problem is I believe, the f/w switches the KPA3 ON at 8  watts 
> instead of the usual 12………..
>  
> Performing a MANUAL TX Gain procedure on 6M may help.
>  
> Here is link to post I made several weeks ago.
>  
> https://www.mail-archive.com/elecraft@mailman.qth.net/msg241436.html
>  
> 73 de Ben W4SC
>  
> Sent from Mail for Windows 10

Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

__
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 Message 
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com 

[Elecraft] Elecraft Items F/S

[exbpi]

I have the following items for the K2 and K3 radios for sale:

 

1. KIO2 Aux I/O Module for K2, unbuilt in original package. $60 shipped
CONUS

 

2. Same as item 1, KIO2 Aux I/O Module for K2, unbuilt in original package.
$60 shipped CONUS

 

3. KIO3 I/O Module for the K3 transceiver. This item is used and was
replaced by the KIO3B upgrade. The KIO3 module was working fine when
replaced by the KIO3B. $100 shipped CONUS

 

4. VFO A Main and VFO B Sub tuning knobs for the K3 transceiver. These knobs
are in as-new condition and were replaced by custom knobs produced by 73CNC
(https://www.dtsohio.com/73cnc/elecraft.html). $40 for both knobs shipped
CONUS.

 

5. Blue felt dust cover for the K3. This is a custom cover made without
sides which allows for easy covering and removal. The front face in
embroidered with the Elecraft logo and Elecraft K3 in gold lettering.
Picture is available upon request. $20 shipped CONUS

 

Thank You

 

Mike

K7PI

Mercer Island, WA

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KI03 Damaged

[exbpi]

Dana,

I do have a perfectly working spare...let me take a look today as I have a 
bunch of spares for the Elecraft lines that I need to quantify...let me know if 
you are interested.

Mike
K7PI

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Dana
Sent: Wednesday, July 29, 2020 07:41
To: elecraft@mailman.qth.net
Subject: [Elecraft] KI03 Damaged

HI all… 

My K3 suffered some EMP damage from a recent T storm… I’ve found L4 on the KIO3 
remote IO board open with evidence of heating on it….not sure what else may 
have been nuked.

If I turn on the radio with the KIO3 in  the radio boots up but then switches 
between TX and RX about 1/ sec … everything else seems normal.
If I try to connect via RS232 it just goes into TX … 

If I pull the board all appears functionally normal.

Has anyone experienced this similar issue when the IO gets damaged?

Does anyone have a spare KIO3 board that they may have pulled and saved when 
upgrading to the USB IO set up, or any suggestions as to what else may be 
damaged , like U1 ?

Thanks in advance
73 Dana VE3DS
Toronto
__
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 Message 
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KPA1500 Power Supply Fan Noise

[exbpi]

Hi Steve,

Thanks for the update.

So, this is the LED board on the amp, not the power supply? Guess we don't
know at what serial number the change was made?

Mike
K7PI


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of STEPHEN R ZUMBRUN
Sent: Saturday, June 27, 2020 16:39
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Power Supply Fan Noise

Hello, all and Happy Field Day. Say I just wanted to comment about Elecraft
service and the help they provided me to make a mod to my KPA1500. My
KPA1500 power supply fan was rather noisy. I had seen discussion on the
reflector about this so I contacted Doug at Elecraft service. He ask if I
could solder.  I informed him I could and he sent me a new 22 ohm, 3 watt
resistor and i swapped it out with the 10 ohm, 3 watt resistor on the LED
board of the power supply. I am much pleased with the sound of the power
supply fan now after the modification. My amp is an early serial number and
the new amps come with the 22 ohm resistor on the LED board. So...if your
power supply is a bit noisy you might consider this mod and contact Doug at
Elecraft Service. The Elecraft part number of the resistor is E500128. 73,
Steve W0SZ.
__
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 Message
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KPA1500 fan mod done - MUCH better

[exbpi]

Dave,

So, are these mods documented somewhere on the Elecraft site? I have been 
unable to locate them. Further, I can't even get Elecraft to respond about when 
they will provide schematics for the KPA1500.

Thanks

Mike
K7PI


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Dave
Sent: Thursday, June 4, 2020 22:41
To: Eric Norris 
Cc: elecraft@mailman qth. net 
Subject: Re: [Elecraft] KPA1500 fan mod done - MUCH better

Yeah PSU fan noise is on par with the fans in the Flex 6700 now. PC is almost 
completely silent. Thinking of locating the amp, radio, and 4O3A 2x8 antenna 
switch in my garage in a half height server cabinet. Then I could hear myself 
think, but maybe I don’t want to hear myself ;-)

The two chip resistor mod on filter board was fun. I have experience with 
surface mount rework so no big deal. One resistor was the size of “16” onthe 
date on a penny (2016).

Other mods - they installed zener diodes tonthe gates on the LDMOS devices to 
protect against overdrive. That is one thing the LDMOS devices do not like.

Mybamp uses a pair of NXP 1K50H devices which I feel are more rugged than 
BLF188 and 189s. I heard early amps used the 188s but no proof of that.

Have fun! 

73
Dave

Sent from my iPad

> On Jun 5, 2020, at 1:10 AM, Eric Norris  wrote:
> 
> 
> I had completely forgotten that I did this mod, and the two resistors mod.  
> That, and the piece of grit or whatever that was stuck in one of the PSU fans 
> making it scream like a banshee, took the KPA1500 PSU fan noise from being 
> intolerable to unnoticable.  
> 
> Good times!  Ain't it grand!  
> 
> 73 Eric WD6DBM
> 
>> On Thu, Jun 4, 2020, 4:59 PM  wrote:
>> Hi All,
>> 
>> 
>> 
>> Received the new LED board for my KPA1500 power supply. Easy to swap 
>> out, six plugs and two screws. You can move one plug at a time to the 
>> new board so there is no chance of screwing anything up. To put the 
>> screws back in I suggest a Phillips screwdriver with magnetic tip. It 
>> took more time to remove the 16 screws from the top cover than to swap the 
>> board.
>> 
>> 
>> 
>> THANK YOU Elecraft!
>> 
>> 
>> 
>> 73
>> 
>> Dave wo2x
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> __
>> 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 Message delivered to 
>> norrislawfi...@gmail.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 Message 
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com 

Re: [Elecraft] KPA1500 PSU fan mod - Need resistor

[exbpi]

So where in the world is this modification described? Can't find anything on
the Elecraft web site.

Mike
K7PI

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of rocke...@gmail.com
Sent: Thursday, May 28, 2020 06:12
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 PSU fan mod - Need resistor

Hi 

 

I emailed support over the weekend and have not heard back. Not sure if they
received the email or are backlogged in response due to COVID-19, so posting
here.

 

Looking for the resistor needed for mod to lower PSU fan speed on KPA1500
s/n 423

 

73

Dave wo2x

 

__
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 Message
delivered to ex...@comcast.net 

__
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
Message delivered to arch...@mail-archive.com