Bad start to FD - smoked a K3!!!!

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Bad start to FD - smoked a K3!!!!

NZ0T
We had one guy get on 75 with a KW with another on 40.  Guy on 40 didn't know.  He got the RFI warning, the K3 locked up and he smelled smoke.  Now his K3 has no RX at all.  I thought there was a high power protection circuit?  We have other rigs to use but any input as to what needs to be done with the smoked K3 would be appreciated before he sends it back to Aptos.

73 Bill NZ0T  My K3 is OK
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Re: Bad start to FD - smoked a K3!!!!

Jim Brown-10
On Sat, 26 Jun 2010 06:06:55 -0700 (PDT), NZ0T wrote:

>We had one guy get on 75 with a KW

A KW on Field Day? What's this world coming to? FD is a low power event. High
power is like a you know what in the punchbowl.

73, Jim K9YC


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Re: Bad start to FD - smoked a K3!!!!

n7ws
Funny, the rules say:

7.2.4. If any or all contacts are made using an output power greater than 150 Watts, the power multiplier is 1 (one).

That suggests that 1KW is perfectly legal.  Think of it as a transmission line loss compensator.

--- On Sat, 6/26/10, Jim Brown <[hidden email]> wrote:

From: Jim Brown <[hidden email]>
Subject: Re: [Elecraft] Bad start to FD - smoked a K3!!!!
To: "[hidden email]" <[hidden email]>
Date: Saturday, June 26, 2010, 9:22 AM

On Sat, 26 Jun 2010 06:06:55 -0700 (PDT), NZ0T wrote:

>We had one guy get on 75 with a KW

A KW on Field Day? What's this world coming to? FD is a low power event. High
power is like a you know what in the punchbowl.

73, Jim K9YC




     
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Re: Bad start to FD - smoked a K3!!!!

Jim Wiley-2
In reply to this post by Jim Brown-10
Jim -


( rant mode on  <grin> )


What you say is perhaps pertinent to all you flat-landers - but then
there's those of us who have to run high power just to be heard.


Or, we could equalize things another way.  We can run 100 watts, but
then we would insist that  all of you South-48 types  not count any QSO  
from a station closer than 1500 miles from your  FD site.   That's what  
FD means to us, you see.  Other than within Alaska, the closest FD
stations we can work (Seattle, WA area) are 1500 miles (or more) distant.


If we don't run the amps, our QSO rate is about 1/5 of of what we get at
higher power.  Part of the problem is that all the flat-landers are
aimed East or West, not north or south.  And 150 watts to 40 or 80 meter
dipole that is 30 feet high doesn't make it up this way very well -
particularly when we have daylight 18 hours of the day  (solar time,
which means disregarding  civil offsets like daylight saving time,  
means the sun comes up about 2:00 AM and sets about 10:00 PM.)


I have long maintained that FD stations located in areas not part of the
contiguous 48 states should be allowed to run higher power without
penalty. There are FD stations from Guam, Hawaii, Puerto Rico (and so
on)  too.  Hawaii is more like 2500 miles to it's closest FD neighbor.


( rant mode off.  We now return you to to your regularly scheduled
reflector )


Jim, KL7CC
Anchorage, AK



Jim Brown wrote:
> A KW on Field Day? What's this world coming to? FD is a low power event. High
> power is like a you know what in the punchbowl.
>
> 73, Jim K9YC
>
>
>  
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Re: Bad start to FD - smoked a K3!!!!

N5GE
In reply to this post by n7ws
On Sat, 26 Jun 2010 09:31:51 -0700 (PDT), Wes Stewart <[hidden email]>
wrote:

It ain't against the rules, but it sure is stupid, with all the other
RX's within a 500? foot radius, who could copy anything while that LID
is transmitting?  It's a wonder he didn't fry some other RX's (or
maybe he did).

Tom Childers, N5GE
Licensed since 1976
QCWA Life Member 35102

[hidden email]
http://www.n5ge.com
http://www.swotrc.net

>Funny, the rules say:
>
>7.2.4. If any or all contacts are made using an output power greater than 150 Watts, the power multiplier is 1 (one).
>
>That suggests that 1KW is perfectly legal.  Think of it as a transmission line loss compensator.
>
>--- On Sat, 6/26/10, Jim Brown <[hidden email]> wrote:
>

[snip]

>>We had one guy get on 75 with a KW
>
>A KW on Field Day? What's this world coming to? FD is a low power event. High
>power is like a you know what in the punchbowl.
>
>73, Jim K9YC

[snip]

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Re: Bad start to FD - smoked a K3!!!!

n7ws
I guess all of those DXpeditions using K3s are running QRP.

--- On Sat, 6/26/10, Radio Amateur N5GE <[hidden email]> wrote:

From: Radio Amateur N5GE <[hidden email]>
Subject: Re: [Elecraft] Bad start to FD - smoked a K3!!!!
To: [hidden email]
Date: Saturday, June 26, 2010, 11:29 AM

On Sat, 26 Jun 2010 09:31:51 -0700 (PDT), Wes Stewart <[hidden email]>
wrote:

It ain't against the rules, but it sure is stupid, with all the other
RX's within a 500? foot radius, who could copy anything while that LID
is transmitting?  It's a wonder he didn't fry some other RX's (or
maybe he did).

Tom Childers, N5GE
Licensed since 1976
QCWA Life Member 35102

[hidden email]
http://www.n5ge.com
http://www.swotrc.net

>Funny, the rules say:
>
>7.2.4. If any or all contacts are made using an output power greater than 150 Watts, the power multiplier is 1 (one).
>
>That suggests that 1KW is perfectly legal.  Think of it as a transmission line loss compensator.
>
>--- On Sat, 6/26/10, Jim Brown <[hidden email]> wrote:
>

[snip]

>>We had one guy get on 75 with a KW
>
>A KW on Field Day? What's this world coming to? FD is a low power event. High
>power is like a you know what in the punchbowl.
>
>73, Jim K9YC

[snip]

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Re: Bad start to FD - smoked a K3!!!!

N5GE
On Sat, 26 Jun 2010 10:56:24 -0700 (PDT), Wes Stewart <[hidden email]>
wrote:

>I guess all of those DXpeditions using K3s are running QRP.

I recon they probably space out as wide as they can get and that's
probably more than 500 feet.

DXpeditions ain't the same as FD, the OP's don't get to go on them if
they would jeopardize the expedition or the equipment.  At FD everyone
with a license gets to operate, unless it's a really hard core club or
group, and that is as it should be.

I'll stand by my statement.  However, to keep the banter down on the
reflector, if there are any more comments about my post, please email
me directly.

Tom Childers, N5GE
Licensed since 1976
QCWA Life Member 35102

[hidden email]
http://www.n5ge.com
http://www.swotrc.net


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Re: Bad start to FD - smoked a K3!!!!

N5GE
In reply to this post by Jim Wiley-2
On Sat, 26 Jun 2010 09:07:55 -0800, Jim Wiley <[hidden email]>
wrote:

Jim, et al,

I guess I came off as somehow opposed to amplifiers.  I am not, and
have several of my own, which I use when I need the power to
communicate with you guys in AK and others around the world, but I
don't drive up beside another ham on the HWY and blast him with my 2m
amp.

Please send any responses directly to me.

Thanks,

Tom Childers, N5GE
Licensed since 1976
QCWA Life Member 35102

[hidden email]
http://www.n5ge.com
http://www.swotrc.net

>Jim -
>
>
>( rant mode on  <grin> )
>
>
>What you say is perhaps pertinent to all you flat-landers - but then
>there's those of us who have to run high power just to be heard.
>
>
>Or, we could equalize things another way.  We can run 100 watts, but
>then we would insist that  all of you South-48 types  not count any QSO  
>from a station closer than 1500 miles from your  FD site.   That's what  
>FD means to us, you see.  Other than within Alaska, the closest FD
>stations we can work (Seattle, WA area) are 1500 miles (or more) distant.
>
>
>If we don't run the amps, our QSO rate is about 1/5 of of what we get at
>higher power.  Part of the problem is that all the flat-landers are
>aimed East or West, not north or south.  And 150 watts to 40 or 80 meter
>dipole that is 30 feet high doesn't make it up this way very well -
>particularly when we have daylight 18 hours of the day  (solar time,
>which means disregarding  civil offsets like daylight saving time,  
>means the sun comes up about 2:00 AM and sets about 10:00 PM.)
>
>
>I have long maintained that FD stations located in areas not part of the
>contiguous 48 states should be allowed to run higher power without
>penalty. There are FD stations from Guam, Hawaii, Puerto Rico (and so
>on)  too.  Hawaii is more like 2500 miles to it's closest FD neighbor.
>
>
>( rant mode off.  We now return you to to your regularly scheduled
>reflector )
>
>
>Jim, KL7CC
>Anchorage, AK
>
>
>
>Jim Brown wrote:
>> A KW on Field Day? What's this world coming to? FD is a low power event. High
>> power is like a you know what in the punchbowl.
>>
>> 73, Jim K9YC
>>
>>
>>  
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Re: Bad start to FD - smoked a K3!!!!

W8JI
In reply to this post by NZ0T
> We had one guy get on 75 with a KW with another on 40.  Guy on 40 didn't
> know.  He got the RFI warning, the K3 locked up and he smelled smoke.  Now
> his K3 has no RX at all.  I thought there was a high power protection
> circuit?  We have other rigs to use but any input as to what needs to be
> done with the smoked K3 would be appreciated before he sends it back to
> Aptos.

Bill,

I'm sure this will generate a flurry of responses without asking important
questions. :-)

How far apart were the antennas, and how well were the antennas constructed
and installed?

The how far apart thing is easy. The more complicated and important thing is
the installation. If they didn't suppress common mode from the antennas, you
could have direct RF excitation coming through wiring to a common generator.
If the antennas were next to each other, then you could have direct
coupling. Even feedline lengths, because it affects current and voltage on
bands where the feedline is mismatched, can have a huge impact.

Also, some antennas respond much better to out-of-band signals than other
antennas do.

To give you an example of how immune the K3 is to problems, I have several
antennas within 1/2 wave of each other and have no issues at all with the K3
on one and 1500 watts on the other antennas. But.......these are planned
antennas that have reasonable band-selectivity. I don't do anything foolish.

At field day, I have never operated without a bandpass filter on my rigs.
As a matter of fact I keep two or three old Johnson KW matchboxes around for
just such occasions.

I made some measurements in my K3 and antennas because I had an unexplained
failure in the post mixer amplifier. (This had NOTHING to do with RF levels,
it was a new operation failure when I first connected the K3 by itself.)
Current can get pretty high in that device when input level goes over 10-20
dBm. The mixer is tough and just passes the input signal right through!

I'm not sure what the most common failure is, but when I looked at mine the
device following the mixer seemed to be the thing that got hottest fastest.
Of course with a very high quick spike, damage could be almost anything near
the front end.

Bottom line is if an extra 10 dB from an amp caused the K3 to fail, the
system was not planned very well. You should have a hell of a lot more
headroom than 10 dB below catastrophic failure in a good installation, so it
might have ate the K3 up anyway over time at 100 watts!

73 Tom

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Re: Bad start to FD - smoked a K3!!!!

NZ0T
In reply to this post by NZ0T
Ok guys lets get a few things straightened out here. Number one all of the answers that were slanderous or laced with ridacule were very much uncalled for. This was not a planned operation. It was the case of one operator rising early on FD and getting on with power. This was not and I repeat not going to be used in field day operations. The operator of the K3 that was fried arose and went into an operating area completely away from the gentleman whom was operating qro and turned on his K3 unaware of the early morning dx hunter whom was just being a ham radio operator. We posted the incident hoping that someone would come up with a cure that we could apply in the field. That was all that was intended and nothing else. All here are experienced operators and would never have intentionally done this on purpose. It just is a very unfortunate incident that yes should have not happened but it did so now we will try to get it fixed and go on.

We are sorry to have cause so much trouble. I suggest this thread should end unless someone can give us a credible fix.

The owner of the k3  John H Howard  being allowed to post on nz0t log in as I do not have one.
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Re: Bad start to FD - smoked a K3!!!!

juergen piezo
In reply to this post by NZ0T

Hi Bill

You probably smoked the KANT board.

The 8mhz trap  seems to get smoked by  nearby high power transmitters. This happened to 2 of our clubs K3's in a field day operation. We just replaced the parts and cleaned up the crispy critters(the tracks)!

This happened with widely separated  antennas and separate power supplies.
You just about  have a heart attack when smokes pours out of the K3!

I would not panic, just check the KANT3 board, I could be wrong!


73
John


--- On Sat, 6/26/10, NZ0T <[hidden email]> wrote:

> From: NZ0T <[hidden email]>
> Subject: [Elecraft] Bad start to FD - smoked a K3!!!!
> To: [hidden email]
> Date: Saturday, June 26, 2010, 6:06 AM
>
> We had one guy get on 75 with a KW with another on
> 40.  Guy on 40 didn't
> know.  He got the RFI warning, the K3 locked up and he
> smelled smoke.  Now
> his K3 has no RX at all.  I thought there was a high
> power protection
> circuit?  We have other rigs to use but any input as
> to what needs to be
> done with the smoked K3 would be appreciated before he
> sends it back to
> Aptos.
>
> 73 Bill NZ0T  My K3 is OK
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Bad-start-to-FD-smoked-a-K3-tp5225225p5225225.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>


     
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Re: Bad start to FD - smoked a K3!!!!

juergen piezo
In reply to this post by NZ0T
Hi Bill

You probably smoked the KANT board.

The 8mhz trap  seems to get smoked by  nearby high power transmitters. This happened to 2 of our clubs K3's in  field day operations. We just replaced the parts and cleaned up the crispy critters(the tracks)!

This happened with widely separated  antennas and separate power supplies.
You almost  have a heart attack when smokes pours out of the K3!

I would not panic, just check the KANT3 board.


73
John

--- On Sat, 6/26/10, NZ0T <[hidden email]> wrote:

> From: NZ0T <[hidden email]>
> Subject: [Elecraft] Bad start to FD - smoked a K3!!!!
> To: [hidden email]
> Date: Saturday, June 26, 2010, 6:06 AM
>
> We had one guy get on 75 with a KW with another on
> 40.  Guy on 40 didn't
> know.  He got the RFI warning, the K3 locked up and he
> smelled smoke.  Now
> his K3 has no RX at all.  I thought there was a high
> power protection
> circuit?  We have other rigs to use but any input as
> to what needs to be
> done with the smoked K3 would be appreciated before he
> sends it back to
> Aptos.
>
> 73 Bill NZ0T  My K3 is OK
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Bad-start-to-FD-smoked-a-K3-tp5225225p5225225.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>


     
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Re: Bad start to FD - smoked a K3!!!!

NZ0T
In reply to this post by NZ0T
Exactly what we were looking for and thank you as we suspected the Kant3 board right at the beginning. Will address the issue.

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Re: Bad start to FD - smoked a K3!!!!

Dunc Carter - W5DC
The KANT3 board is easy to work on.  You need to be careful about not
bending the voltage regulator leads as they will fatigue and break if
bent repeatedly, but otherwise, working on it is very straight forward.  
In the case of my problem, the 8 MHz trap was suspected to be the source
of a problem causing low output on 30 meters but wasn't.

Dunc, W5DC
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Re: Bad start to FD - smoked a K3!!!!

Milt -- N5IA
In reply to this post by n7ws
K3s and KWs worked great at VP6DX for more than 186,000 Qs.

4 transmitters at one location and 3 transmitters at another location; at
each location transmitting simultaneously within a 400' diameter circle, 24
hpd for 17 days.

My trademarked definition of our operation was "Field Day and Boy Scout Camp
combined, on steroids".

YMMV, de Milt, N5IA

----- Original Message -----
From: "Wes Stewart" <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Saturday, June 26, 2010 10:56 AM
Subject: Re: [Elecraft] Bad start to FD - smoked a K3!!!!


I guess all of those DXpeditions using K3s are running QRP.

--- On Sat, 6/26/10, Radio Amateur N5GE <[hidden email]> wrote:

From: Radio Amateur N5GE <[hidden email]>
Subject: Re: [Elecraft] Bad start to FD - smoked a K3!!!!
To: [hidden email]
Date: Saturday, June 26, 2010, 11:29 AM

On Sat, 26 Jun 2010 09:31:51 -0700 (PDT), Wes Stewart <[hidden email]>
wrote:

It ain't against the rules, but it sure is stupid, with all the other
RX's within a 500? foot radius, who could copy anything while that LID
is transmitting? It's a wonder he didn't fry some other RX's (or
maybe he did).

Tom Childers, N5GE

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Re: Bad start to FD - smoked a K3!!!!

Brett Howard
In reply to this post by NZ0T
You may look into checking Q8 and Q9 in the post amplifier.  You can see
what I'm talking about in the top right section of page 8 on the
schematics (here):
http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf

Also check the resistors around that area for stuff that looks like it
got hot...  R66, R68, R56, R75 and the like...

I had something similar happen to me and Q9 blew on my radio.  Replace
Q8 and Q9 together if its needed as well as any of the resistors that
had a hard day and you should be ok...

The K3 does have protection for this if you have the mod in place that
helps make it happen.  The current through this path is monitored and if
the power in gets too high it can turn off your preamp or engage the ATT
to try and protect itself.  However when running high power with
multiple stations in close proximity there are procedures and equipment
that should be in place or you're going to have problems no matter what
brand of radio you're running.

~Brett (N7MG)

On Sat, 2010-06-26 at 06:06 -0700, NZ0T wrote:
> We had one guy get on 75 with a KW with another on 40.  Guy on 40 didn't
> know.  He got the RFI warning, the K3 locked up and he smelled smoke.  Now
> his K3 has no RX at all.  I thought there was a high power protection
> circuit?  We have other rigs to use but any input as to what needs to be
> done with the smoked K3 would be appreciated before he sends it back to
> Aptos.
>
> 73 Bill NZ0T  My K3 is OK


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Re: Bad start to FD - smoked a K3!!!!

Brett Howard
I should also add that you can find these components if you pull the
bottom front cover off (the one with the bail on it) and look toward
the right side when the radio is sitting on its top...

~Brett (N7MG)

On Sun, Jun 27, 2010 at 5:35 PM, Brett Howard <[hidden email]> wrote:

> You may look into checking Q8 and Q9 in the post amplifier.  You can see
> what I'm talking about in the top right section of page 8 on the
> schematics (here):
> http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf
>
> Also check the resistors around that area for stuff that looks like it
> got hot...  R66, R68, R56, R75 and the like...
>
> I had something similar happen to me and Q9 blew on my radio.  Replace
> Q8 and Q9 together if its needed as well as any of the resistors that
> had a hard day and you should be ok...
>
> The K3 does have protection for this if you have the mod in place that
> helps make it happen.  The current through this path is monitored and if
> the power in gets too high it can turn off your preamp or engage the ATT
> to try and protect itself.  However when running high power with
> multiple stations in close proximity there are procedures and equipment
> that should be in place or you're going to have problems no matter what
> brand of radio you're running.
>
> ~Brett (N7MG)
>
> On Sat, 2010-06-26 at 06:06 -0700, NZ0T wrote:
>> We had one guy get on 75 with a KW with another on 40.  Guy on 40 didn't
>> know.  He got the RFI warning, the K3 locked up and he smelled smoke.  Now
>> his K3 has no RX at all.  I thought there was a high power protection
>> circuit?  We have other rigs to use but any input as to what needs to be
>> done with the smoked K3 would be appreciated before he sends it back to
>> Aptos.
>>
>> 73 Bill NZ0T  My K3 is OK
>
>
>
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Re: Bad start to FD - smoked a K3!!!!

The Smiths
In reply to this post by Jim Wiley-2

Sorry, that just sounds like a lot of "spinning" to me.  I worked 4 different KL stations this weekend and NONE of them were using 1KW!  They did just fine on their little dipoles and 100w rigs.   If they can hear me on a wilre, I sure as S**T can hear them.  
 

> Date: Sat, 26 Jun 2010 09:07:55 -0800
> From: [hidden email]
> To: [hidden email]
> CC: [hidden email]
> Subject: Re: [Elecraft] Bad start to FD - smoked a K3!!!!
>
> Jim -
>
>
> ( rant mode on <grin> )
>
>
> What you say is perhaps pertinent to all you flat-landers - but then
> there's those of us who have to run high power just to be heard.
>
>
> Or, we could equalize things another way. We can run 100 watts, but
> then we would insist that all of you South-48 types not count any QSO
> from a station closer than 1500 miles from your FD site. That's what
> FD means to us, you see. Other than within Alaska, the closest FD
> stations we can work (Seattle, WA area) are 1500 miles (or more) distant.
>
>
> If we don't run the amps, our QSO rate is about 1/5 of of what we get at
> higher power. Part of the problem is that all the flat-landers are
> aimed East or West, not north or south. And 150 watts to 40 or 80 meter
> dipole that is 30 feet high doesn't make it up this way very well -
> particularly when we have daylight 18 hours of the day (solar time,
> which means disregarding civil offsets like daylight saving time,
> means the sun comes up about 2:00 AM and sets about 10:00 PM.)
>
>
> I have long maintained that FD stations located in areas not part of the
> contiguous 48 states should be allowed to run higher power without
> penalty. There are FD stations from Guam, Hawaii, Puerto Rico (and so
> on) too. Hawaii is more like 2500 miles to it's closest FD neighbor.
>
>
> ( rant mode off. We now return you to to your regularly scheduled
> reflector )
>
>
> Jim, KL7CC
> Anchorage, AK
>
>
>
> Jim Brown wrote:
> > A KW on Field Day? What's this world coming to? FD is a low power event. High
> > power is like a you know what in the punchbowl.
> >
> > 73, Jim K9YC
> >
> >
> >
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