[Elecraft] Elecraft CW Net Report

[kevin]

Good Evening,

   Conditions were not good on either band.  QSB was moderate, signals 
were weak, and the noise levels were high.  Between that, and the 
holiday, I got about as many emails as I did check ins :) While it is 
growing drier here in the Northwest Roy said his vertical was performing 
better over a deluge soaked ground.  I may have to water my antenna 
before it dies of thirst.



  On 14050.5 kHz at 2200z:

K0DTJ - Brian - CA

W0CZ - Ken - ND

K4JPN - Steve - GA

K6XK - Roy - IA


  On 7047.5 kHz at z:

W7JRD - Jim - ID

K0DTJ - Brian - CA

KG7V - Marv - WA



   Until next week 73,

  Kevin.  KD5ONS




-




Here is a link to a video of a very good description of how to use one 
of Feynman's integration techniques.  I wish my calculus professors had 
been so clear and enthusiastic.  This guy makes it fun to keep all the 
parts in your head as he speaks.  I plan to watch a few more of these to 
exercise dormant memories.



https://www.youtube.com/watch?v=4fSvflBb_3Y

https://www.youtube.com/@maths_505



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Re: [Elecraft] KPA500 Fan Question

[Jack Brindle via Elecraft]

Hi Jim!
Hope you are enjoying Idaho. I hear it is a great place to be!

The fan in the KPA500 goes to level 3 at 60 degrees. It goes to full-on at 80 
degrees. 
The levels are:
level 1 - 50C degrees
level 2 - 55C degrees
level 3 - 60C degrees
level 4 - 65C degrees
level 5 - 70C degrees
level 6 - 80C degrees
The amplifier will fault at a temperature is 90C.

What mode are you operating? And, for those using TS-890s, why would the KPA 
behave any differently than it does with a K3? Has anyone checked for spurs or 
harmonics coming out of the transmitter? (NOT suggesting there are any, mind 
you). I’m looking for reasons the KPA would heat up any faster than with a K3. 
Are you seeing anything else, like strange band changes?

But, rest assured that the KPA will run just fine at 60 or 65 degrees. The fan 
sound is just telling you the KPA is doing its normal great job at protecting 
itself.

73,
Jack, W6FB
p.s. I didn’t want the snow, so I went the other way, going home to Louisiana…


> On May 14, 2023, at 12:23 PM, James Bennett via Elecraft 
>  wrote:
> 
> Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp 
> at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which 
> in turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has 
> provided me with a nice 1.2:1 SWR, as displayed on the amp. The resting temp 
> of the amp shows 42C. At 29 watts input to the amp, I’m seeing about 480 
> watts of power from the amp. The amp has nothing sitting on top of it, and 
> the wall behind it is over 12” away. There is about 2” clearance on either 
> side of the amp, and it is sitting on top of the KAT500.
> 
> The issue: The fan comes on in a very short time - less than 20 seconds - and 
> the temp display runs up to 50+ degrees. If I start calling CQ or get into a 
> QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is 
> running at max.
> 
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan would 
> come on but NEVER at the max, loud level. Interestingly, many moons ago I 
> also had a KX3 and had it connected to the KPA500. I noticed that the fan 
> would also come on fairly quickly with that rig driving the amp, but I never 
> thought too much about it. Until now...
> 
> But now, I think there is some sort of problem. It seems to me that the temp 
> shouldn’t get that high that fast nor should the fan start roaring in that 
> short amount of time. I could understand it if the SWR was really bad, but at 
> 1.2:1
> 
> Any ideas why the amp fan should be acting this way with a non-K3 or non-K4 
> driving it?
> 
> Jim / K7TXA
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[Elecraft] N6TV Product Announcement - new "K-ON" plugin for K3, K3S, and K4

[Bob Wilson, N6TV]

Thanks to circuit design help from K9JB, and after review by Elecraft Chief
Engineer, N6KR, I'm now able to provide a new plugin module for
the Elecraft K3 and K4 that I call the "K-ON".

When connected to the rig's ACC jack directly, or via a 15-pin Y-cable or
Y-BOX , the rig will automatically power up whenever
the rig's DC power supply powers up.  This could be useful to remote
stations with Internet-accessible AC power strips.  I also find it useful
at my home station where I use a "Master Power On" switch that powers
everything up automatically, including two K4Ds.

If you already have a Y-BOX with an unused connector, the K-ON plugs right
in.  I'm also including the same circuit inside the new Y-BOX v4.0 (so the
plugin is not needed).  The "Auto On" feature of Y-BOX v4.0 can be enabled
or disabled by a shortened RCA plug, as shown in the third demo video on
the website.

For photos, demo videos, and ordering one or more K-ON plugins, please
visit the new website.

https://bit.ly/N6TV-KON

Unlike some solutions that have previously been suggested, such as
connecting a big capacitor to ACC Pin 8, connecting the K-ON plugin has no
surprise side effects.  The rig's POWER switch and PS0; commands continue
to function normally, so the rig shuts down properly while the module
remains connected, as shown in the videos.  You can still connect a
RemoteRig box in parallel with no issues either; it will still function
normally.

73,
Bob, N6TV
https://bit.ly/N6TV-KON
https://bit.ly/Y-BOX
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[Elecraft] Elecraft P3/VGA

[Ron Freeman]

Very nice P3/VGA Panadapter for sale by original owner from no pet and no smoke 
home. Sale includes the following:
1. Elecraft K3 to P3 cable
2. Elecraft K3 to P3 IF cable
3. Elecraft K3 to P3 Power cable
4. Owners Manual
5. Fred Cady - KE7X P3 Manal
Additional pictures available.  Price is $720 shipped in original packaging 
conus.
73//k5mm/ron


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[Elecraft] P3 FS

[Marty via Elecraft]

I have a pristine and working 100% P3 that I can take to Dayton/Xenia.  No VGA 
or K3 cables (I used it with a non-Elecraft rig.) I did put 1/2 down on a VGA 
upgrade for it back when they announced the last chance K3series build years 
ago.  I’ll sell the P3 and transfer the 1/2 upgrade to you for $425, firm, cash 
and carry in Xenia.  Please respond to my QRZ.com email address, as I don’t get 
all the posts on this list (I filter for the K2) Thanks

Marty W4MY
PS:  If there’s time, I can send pics on request.  

73 Marty / W4MY
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Re: [Elecraft] KPA500 Fan Question

[Peter Lascell]

My K3 into the KPA500 for over ten years . . . .   The FAN REV is 1.54
(this might be software)The resting temp is 27C.  When on RTTY I set
the FAN to 4.  Otherwise 2 for most of the time.  Knowing temperature is
the killer of electronics (short of lightning) I try to keep things cool.
For 10 years I have had a 24 V muffin fan running at 12 V sitting on top of
the amp (and another one on the K3).

To rule out VSWR issues, how about connecting the KPA500 directly into a
dummy load.

Pete W4WWQ

On Sun, May 14, 2023 at 1:24 PM James Bennett via Elecraft <
elecraft@mailman.qth.net> wrote:

> Got a question (problem?) regarding the fan in my KPA500. I'm driving the
> amp at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500,
> which in turn is hooked to a 30 foot tall Zerofive flagpole vertical. The
> tuner has provided me with a nice 1.2:1 SWR, as displayed on the amp. The
> resting temp of the amp shows 42C. At 29 watts input to the amp, I’m seeing
> about 480 watts of power from the amp. The amp has nothing sitting on top
> of it, and the wall behind it is over 12” away. There is about 2” clearance
> on either side of the amp, and it is sitting on top of the KAT500.
>
> The issue: The fan comes on in a very short time - less than 20 seconds -
> and the temp display runs up to 50+ degrees. If I start calling CQ or get
> into a QSO, it doesn’t take long for the temp to show over 60 degrees and
> the fan is running at max.
>
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan
> would come on but NEVER at the max, loud level. Interestingly, many moons
> ago I also had a KX3 and had it connected to the KPA500. I noticed that the
> fan would also come on fairly quickly with that rig driving the amp, but I
> never thought too much about it. Until now...
>
> But now, I think there is some sort of problem. It seems to me that the
> temp shouldn’t get that high that fast nor should the fan start roaring in
> that short amount of time. I could understand it if the SWR was really bad,
> but at 1.2:1
>
> Any ideas why the amp fan should be acting this way with a non-K3 or
> non-K4 driving it?
>
> Jim / K7TXA
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-- 
Pete Lascell
Forest, VA
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[Elecraft] 40 meter 7.280 Sunday net, 1900Z

[Steve Hall]

Short skip was quite good out to 500 miles or so.

STEVE WM6P GA K4D NET CONTROL
NC9O SKIP NC K4D
K4DML DOUG TN K3
W9EJB ED IN K4D
WB9JNZ ERIC IL FTDX101D
K8NU CARL OH K4D
AF1 JOE NC K4D
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Re: [Elecraft] KPA500 Fan Question

[AL7CR]

My setup is like yours and the response is exactly the same.   Starting use on 
fan speed 4 delays the temp rise for a short time. Mine has run many many  
hours at temps up to 70 with no problems.   Hottest on 20m and  requires the 
most drive on that band also. 

On Sun, May 14, 2023, at 10:23 AM, James Bennett via Elecraft wrote:
> Got a question (problem?) regarding the fan in my KPA500. I'm driving 
> the amp at 29 watts from a Kenwood TS-890S. The amp is connected to a 
> KAT500, which in turn is hooked to a 30 foot tall Zerofive flagpole 
> vertical. The tuner has provided me with a nice 1.2:1 SWR, as displayed 
> on the amp. The resting temp of the amp shows 42C. At 29 watts input to 
> the amp, I’m seeing about 480 watts of power from the amp. The amp has 
> nothing sitting on top of it, and the wall behind it is over 12” away. 
> There is about 2” clearance on either side of the amp, and it is 
> sitting on top of the KAT500.
>
> The issue: The fan comes on in a very short time - less than 20 seconds 
> - and the temp display runs up to 50+ degrees. If I start calling CQ or 
> get into a QSO, it doesn’t take long for the temp to show over 60 
> degrees and the fan is running at max.
>
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan 
> would come on but NEVER at the max, loud level. Interestingly, many 
> moons ago I also had a KX3 and had it connected to the KPA500. I 
> noticed that the fan would also come on fairly quickly with that rig 
> driving the amp, but I never thought too much about it. Until now...
>
> But now, I think there is some sort of problem. It seems to me that the 
> temp shouldn’t get that high that fast nor should the fan start roaring 
> in that short amount of time. I could understand it if the SWR was 
> really bad, but at 1.2:1
>
> Any ideas why the amp fan should be acting this way with a non-K3 or 
> non-K4 driving it?
>
> Jim / K7TXA
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[Elecraft] [Electraft] K2/10

[Ray Spreadbury via Elecraft]

Hi Allan

Check out your QRZ Email. 

I sent you a message re your K2 this morning

73

Ray G3XLG

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[Elecraft] Elecraft 80M SSB Net Announcement

[Dave New, N8SBE]

Please join us on 3784 kHz (NOTE THE NEW FREQUENCY), 9PM ET Sunday 
(0100Z Monday). Note that the net stays on the same local time, when we 
switch back and forth to/from Daylight time, so the UTC time changes, 
but not the local time.


Now that we have moved into Daylight time and have longer daylight 
hours, 80M may not be as strong as during the winter.


Your net control this week will be Eric, WB9JNZ, since I'm camping this 
weekend, so my antenna (Eagle One) and power (100W) won't lend itself to 
being net control this evening.


Thanks to Eric for agreeing to run the net this evening.

Hope to see you this evening on the net.

73,

-- Dave, N8SBE

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Re: [Elecraft] KPA500 Fan Question

[Mike Maloney]

 Your resting temperature at 42C seems TOO warm to me?   My KPA resting temp 
runs about the same as ambient temperature of shack, 25-30C.   With 25-30W 
drive from TS-890,my KPA seldom reaches 3rd stage 60 degrees.   Have you 
checked SWR or cable between 890 and KPA?  
73, Mike AC5P
On Sunday, May 14, 2023 at 12:38:56 PM CDT, James Bennett via Elecraft 
 wrote:  
 
 Yes, but the amp is not seeing the mis-match, correct? The tuner is taking 
care of that mis-match and I would have thought that the amp should be 
perfectly happy… Yes?

> On May 14, 2023, at 11:35 AM, Dr. William J. Schmidt  
> wrote:
> 
> You are trying to transform a mis-match and that burns energy.  That’s why 
> the fan is running.
> 
> 
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of James Bennett via Elecraft
> Sent: Sunday, May 14, 2023 12:24 PM
> To: Elecraft Reflector Reflector 
> Subject: [Elecraft] KPA500 Fan Question
> 
> Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp 
> at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which 
> in turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has 
> provided me with a nice 1.2:1 SWR, as displayed on the amp. The resting temp 
> of the amp shows 42C. At 29 watts input to the amp, I’m seeing about 480 
> watts of power from the amp. The amp has nothing sitting on top of it, and 
> the wall behind it is over 12” away. There is about 2” clearance on either 
> side of the amp, and it is sitting on top of the KAT500.
> 
> The issue: The fan comes on in a very short time - less than 20 seconds - and 
> the temp display runs up to 50+ degrees. If I start calling CQ or get into a 
> QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is 
> running at max.
> 
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan would 
> come on but NEVER at the max, loud level. Interestingly, many moons ago I 
> also had a KX3 and had it connected to the KPA500. I noticed that the fan 
> would also come on fairly quickly with that rig driving the amp, but I never 
> thought too much about it. Until now...
> 
> But now, I think there is some sort of problem. It seems to me that the temp 
> shouldn’t get that high that fast nor should the fan start roaring in that 
> short amount of time. I could understand it if the SWR was really bad, but at 
> 1.2:1
> 
> Any ideas why the amp fan should be acting this way with a non-K3 or non-K4 
> driving it?
> 
> Jim / K7TXA
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> delivered to b...@wjschmidt.com 
> 

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Re: [Elecraft] KPA500 Fan Question

[James Bennett via Elecraft]

Yes, but the amp is not seeing the mis-match, correct? The tuner is taking care 
of that mis-match and I would have thought that the amp should be perfectly 
happy… Yes?

> On May 14, 2023, at 11:35 AM, Dr. William J. Schmidt  
> wrote:
> 
> You are trying to transform a mis-match and that burns energy.  That’s why 
> the fan is running.
> 
> 
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of James Bennett via Elecraft
> Sent: Sunday, May 14, 2023 12:24 PM
> To: Elecraft Reflector Reflector 
> Subject: [Elecraft] KPA500 Fan Question
> 
> Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp 
> at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which 
> in turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has 
> provided me with a nice 1.2:1 SWR, as displayed on the amp. The resting temp 
> of the amp shows 42C. At 29 watts input to the amp, I’m seeing about 480 
> watts of power from the amp. The amp has nothing sitting on top of it, and 
> the wall behind it is over 12” away. There is about 2” clearance on either 
> side of the amp, and it is sitting on top of the KAT500.
> 
> The issue: The fan comes on in a very short time - less than 20 seconds - and 
> the temp display runs up to 50+ degrees. If I start calling CQ or get into a 
> QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is 
> running at max.
> 
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan would 
> come on but NEVER at the max, loud level. Interestingly, many moons ago I 
> also had a KX3 and had it connected to the KPA500. I noticed that the fan 
> would also come on fairly quickly with that rig driving the amp, but I never 
> thought too much about it. Until now...
> 
> But now, I think there is some sort of problem. It seems to me that the temp 
> shouldn’t get that high that fast nor should the fan start roaring in that 
> short amount of time. I could understand it if the SWR was really bad, but at 
> 1.2:1
> 
> Any ideas why the amp fan should be acting this way with a non-K3 or non-K4 
> driving it?
> 
> Jim / K7TXA
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> delivered to b...@wjschmidt.com 
> 

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[Elecraft] KPA500 Fan Question

[James Bennett via Elecraft]

Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp 
at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which in 
turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has 
provided me with a nice 1.2:1 SWR, as displayed on the amp. The resting temp of 
the amp shows 42C. At 29 watts input to the amp, I’m seeing about 480 watts of 
power from the amp. The amp has nothing sitting on top of it, and the wall 
behind it is over 12” away. There is about 2” clearance on either side of the 
amp, and it is sitting on top of the KAT500.

The issue: The fan comes on in a very short time - less than 20 seconds - and 
the temp display runs up to 50+ degrees. If I start calling CQ or get into a 
QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is 
running at max.

When I had a K3 and more recently, a K4D - this did NOT happen. The fan would 
come on but NEVER at the max, loud level. Interestingly, many moons ago I also 
had a KX3 and had it connected to the KPA500. I noticed that the fan would also 
come on fairly quickly with that rig driving the amp, but I never thought too 
much about it. Until now...

But now, I think there is some sort of problem. It seems to me that the temp 
shouldn’t get that high that fast nor should the fan start roaring in that 
short amount of time. I could understand it if the SWR was really bad, but at 
1.2:1

Any ideas why the amp fan should be acting this way with a non-K3 or non-K4 
driving it?

Jim / K7TXA
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