Re: [Elecraft] HI CUR warning on K3

[Jim Brown]

On 11/8/2023 8:21 AM, Pete Smith N4ZR wrote:
I've fairly well established that the problem is not at the antenna, but 
arising somewhere in the grounding/RFI protection in my station, since 
it occurs only on one band and (more importantly) because it stopped 
totally after I re-tightened all the connections in my grounding system 
yesterday 


That can certainly be a major cause of problems with RF in the shack.


The Carolina Windom incorporates a line isolator 22 feet down from the 
feedpoint, but technical questions have been raised about exactly what 
you describe, and I'm not technical enough either to question the 
analysis or to experimentally measure the common mode current on the 
feedline.


ALL off-center-fed antennas are a train wreck for RF in the shack, and 
for blowing "line isolators" and chokes. This is because their strong 
imbalance puts huge common mode current on the feedline. They are a very 
bad idea, especially if running high power. Anything done to try to 
"fix" them is putting lipstick on a pig.


73, Jim K9YC

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Re: [Elecraft] HI CUR warning on K3

[Pete Smith N4ZR]

Hi John - I've fairly well established that the problem is not at the 
antenna, but arising somewhere in the grounding/RFI protection in my 
station, since it occurs only on one band and (more importantly) because 
it stopped totally after I re-tightened all the connections in my 
grounding system yesterday .


The Carolina Windom incorporates a line isolator 22 feet down from the 
feedpoint, but technical questions have been raised about exactly what 
you describe, and I'm not technical enough either to question the 
analysis or to experimentally measure the common mode current on the 
feedline.  Further complicating the issue, the feedline to my CW is very 
long - on the order of 250 feet, a mix of RG8-X and Buryflex.  This 
arose because I put the antenna switch at the base of my tower, and the 
feedpoint of the CW is at one extreme of what amounts to a triangle with 
the antenna switch and the shack.


73, Pete N4ZR

On 11/7/2023 11:15 PM, j...@kk9a.com wrote:

I am not very familiar with a Carolina Windom but I believe it is just a
horizonal wire fed off center.  These types of antennas can have significant
common mode current on the feedline. Perhaps there is more current on 40m
than on 80m so it works on 80m.

A resonant dipole with a choke may solve this HI CUR issue.

John KK9a




Pete Smith N4ZR wrote:

I send a few characters of CW into my Carolina Windom on 40M and after a
delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR
warning, and the audio gain is reduced significantly.  Touch the AF gain
control and it instantly returns the gain to normal, but frequently the
HI CURR warning returns over and over, without any additional
transmissions.  This sequence does not happen, even with 1500 watts,
into my dummy load, nor does it happen on the same antenna on 80M, or on
20 meters on my tribander.

I've read the HI CUR warning discussion on page 65 of the manual, but it
doesn't seem relevant, because I don't have external speakers.  The fact
that it  only happens when feeding an actual antenna on one band
suggests RFI, but the fact that the HI CUR warning and gain reduction
recur again and again long after any RF has me puzzled.  Any suggestions
gratefully accepted!


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Re: [Elecraft] HI CUR warning on K3

[Pete Smith N4ZR]

Yeah, I had to replace both the line isolator and the 4:1 balun at the 
feedpoint after about 2 years.


73, Pete N4ZR

On 11/8/2023 11:02 AM, Tom Doligalski via Elecraft wrote:

I have used one for years. That said, I have had to replace the line isolator 
several times!

Also have one in the shack.

Tom W4KX

Sent from my iPad


On Nov 8, 2023, at 10:49 AM,j...@kk9a.com  wrote:

I am not very familiar with a Carolina Windom but I believe it is just a
horizonal wire fed off center.  These types of antennas can have significant
common mode current on the feedline. Perhaps there is more current on 40m
than on 80m so it works on 80m.

A resonant dipole with a choke may solve this HI CUR issue.

John KK9a




Pete Smith N4ZR wrote:

I send a few characters of CW into my Carolina Windom on 40M and after a
delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR
warning, and the audio gain is reduced significantly.  Touch the AF gain
control and it instantly returns the gain to normal, but frequently the
HI CURR warning returns over and over, without any additional
transmissions.  This sequence does not happen, even with 1500 watts,
into my dummy load, nor does it happen on the same antenna on 80M, or on
20 meters on my tribander.

I've read the HI CUR warning discussion on page 65 of the manual, but it
doesn't seem relevant, because I don't have external speakers.  The fact
that it  only happens when feeding an actual antenna on one band
suggests RFI, but the fact that the HI CUR warning and gain reduction
recur again and again long after any RF has me puzzled.  Any suggestions
gratefully accepted!

--
73, Pete N4ZR

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Re: [Elecraft] HI CUR warning on K3

[Tom Doligalski via Elecraft]

I have used one for years. That said, I have had to replace the line isolator 
several times!

Also have one in the shack. 

Tom W4KX

Sent from my iPad 

> On Nov 8, 2023, at 10:49 AM, j...@kk9a.com wrote:
> 
> I am not very familiar with a Carolina Windom but I believe it is just a
> horizonal wire fed off center.  These types of antennas can have significant
> common mode current on the feedline. Perhaps there is more current on 40m
> than on 80m so it works on 80m.  
> 
> A resonant dipole with a choke may solve this HI CUR issue.
> 
> John KK9a
> 
> 
> 
> 
> Pete Smith N4ZR wrote:
> 
> I send a few characters of CW into my Carolina Windom on 40M and after a
> delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR
> warning, and the audio gain is reduced significantly.  Touch the AF gain
> control and it instantly returns the gain to normal, but frequently the
> HI CURR warning returns over and over, without any additional
> transmissions.  This sequence does not happen, even with 1500 watts,
> into my dummy load, nor does it happen on the same antenna on 80M, or on
> 20 meters on my tribander.
> 
> I've read the HI CUR warning discussion on page 65 of the manual, but it
> doesn't seem relevant, because I don't have external speakers.  The fact
> that it  only happens when feeding an actual antenna on one band
> suggests RFI, but the fact that the HI CUR warning and gain reduction
> recur again and again long after any RF has me puzzled.  Any suggestions
> gratefully accepted!
> 
> --
> 73, Pete N4ZR
> 
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Re: [Elecraft] HI CUR warning on K3

[john]

I am not very familiar with a Carolina Windom but I believe it is just a
horizonal wire fed off center.  These types of antennas can have significant
common mode current on the feedline. Perhaps there is more current on 40m
than on 80m so it works on 80m.  

A resonant dipole with a choke may solve this HI CUR issue. 

John KK9a




Pete Smith N4ZR wrote:

I send a few characters of CW into my Carolina Windom on 40M and after a 
delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR 
warning, and the audio gain is reduced significantly.  Touch the AF gain 
control and it instantly returns the gain to normal, but frequently the 
HI CURR warning returns over and over, without any additional 
transmissions.  This sequence does not happen, even with 1500 watts, 
into my dummy load, nor does it happen on the same antenna on 80M, or on 
20 meters on my tribander.

I've read the HI CUR warning discussion on page 65 of the manual, but it 
doesn't seem relevant, because I don't have external speakers.  The fact 
that it  only happens when feeding an actual antenna on one band 
suggests RFI, but the fact that the HI CUR warning and gain reduction 
recur again and again long after any RF has me puzzled.  Any suggestions 
gratefully accepted!

-- 
73, Pete N4ZR

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Re: [Elecraft] HI CUR warning on K3

[W3FPR]

Pete,

The first thing to check for a HI CUR warning is the power supply 
voltage under full transmit load.

If it is low, it will cause a HI CUR condition.
The other thing that could cause it is a problem in the T/R switch or 
Low Pass Filter - the fact that it continues into an RX cycle points to 
that possibility.


73,
Don W3FPR

On 11/7/2023 10:31 AM, Pete Smith N4ZR wrote:
I send a few characters of CW into my Carolina Windom on 40M and after 
a delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR 
warning, and the audio gain is reduced significantly.  Touch the AF 
gain control and it instantly returns the gain to normal, but 
frequently the HI CURR warning returns over and over, without any 
additional transmissions.  This sequence does not happen, even with 
1500 watts, into my dummy load, nor does it happen on the same antenna 
on 80M, or on 20 meters on my tribander.


I've read the HI CUR warning discussion on page 65 of the manual, but 
it doesn't seem relevant, because I don't have external speakers.  The 
fact that it  only happens when feeding an actual antenna on one band 
suggests RFI, but the fact that the HI CUR warning and gain reduction 
recur again and again long after any RF has me puzzled.  Any 
suggestions gratefully accepted!




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[Elecraft] HI CUR warning on K3

[Pete Smith N4ZR]

I send a few characters of CW into my Carolina Windom on 40M and after a 
delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR 
warning, and the audio gain is reduced significantly.  Touch the AF gain 
control and it instantly returns the gain to normal, but frequently the 
HI CURR warning returns over and over, without any additional 
transmissions.  This sequence does not happen, even with 1500 watts, 
into my dummy load, nor does it happen on the same antenna on 80M, or on 
20 meters on my tribander.


I've read the HI CUR warning discussion on page 65 of the manual, but it 
doesn't seem relevant, because I don't have external speakers.  The fact 
that it  only happens when feeding an actual antenna on one band 
suggests RFI, but the fact that the HI CUR warning and gain reduction 
recur again and again long after any RF has me puzzled.  Any suggestions 
gratefully accepted!


--
73, Pete N4ZR
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Re: [Elecraft] HI CUR on 40

[Jim Brown]

On 10/31/2020 6:07 PM, David Olean wrote:
I would put the ferrite at the end of the coax before it goes into the 
rig if there were rf coming down the coax. Common mode energy can and 
will get on the outside of the coax. I am not an expert on this,
I AM an expert on this. :) The most important place for a choke in any 
antenna system is at the feedpoint. It's function is to prevent the 
feedline from becoming part of the antenna by adding a very high common 
mode impedance to the common mode circuit. The only good reasons for a 
choke elsewhere along the line are


1) to prevent the feedline from becoming a parasitic element of another 
antenna; for example, I choke the coax feedlines to my high (125 ft) 
dipoles for 80 and 40 so that they do not become parasitic to my three 
160M verticals. e


2) to prevent coupling shield current by a mechanism quantified as the 
"transfer impedance" of the coax shield. It is the ratio of the 
differential voltage generated inside the coax as a result of shield 
current. Its unit is Ohms, lower is better, and the lower limit is the 
RF resistance of the shield at the frequency of interest. But the 
quality, density, and uniformity of the shield makes an additive 
contribution -- a poor quality shield increases the transfer impedance.


Both of these measures minimize inter-station interference, both in-band 
and cross-band. W6GJB's contesting trailer has antennas for 15, 20, 40, 
and 80 supported on a single pneumatic mast, with their feedpoints 
within about 2 ft of each other. Because they are very effectively 
choked, and because we have dual stubs on the outputs of the power amps 
for the two stations, we can operate on adjacent bands at 500W 
(K3/KPA500) with minimal interference from the lower frequency station's 
harmonics to the higher frequency station. One day, Glen rebuilt the 
connection at the antenna and accidentally left out the choke, and the 
interstation interference was terrible.


A choke at the rig is only a band-aid for failure to do proper grounding 
and bonding in the shack and throughout the house. See N0AX's ARRL book 
on the topic, on which I collaborated, or the slides for my tutorial 
talk at Pacificon, Visalia, and to various ham clubs.

http://k9yc.com/GroundingAndAudio.pdf

The half-wave section of line you described in an earlier post may take 
care of the feedpoint for one band (and it may not be as effective as a 
well-designed choke), but it's not a solution for other bands. Properly 
designed chokes can cover multiple adjacent bands. See 
http://k9yc.com/2018Cookbook.pdf


73, Jim K9YC


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Re: [Elecraft] HI CUR on 40

[David Herring]

If there is ever any question about where to place ferrites, I’ll say in 
general, put the ferrites at both ends of the coax (unless its a really short 
run). 

Some may argue that that is overkill. While there are always exceptional 
circumstances, I would in general respectfully disagree with them if they did. 
While the benefits of placing them at the feed point are well documented, I 
have found that replicating the ferrites at the other end of the coax generally 
reduces noise in the receiver, making it possible to hear and thus work more 
stations… ;-) 

It would also be part of the solution to rf in the shack, provided that the 
ferrites provide enough choking impedance. 5000 ohms at the frequencies in 
question would likely do, but referring to K9YC’s papers for the specifics is 
advised.

Ferrites at both ends, along with proper bounding and grounding of the whole 
station a la K9YC has always worked well for me. 

73,
David - N5DCH



> On Oct 31, 2020, at 7:07 PM, David Olean  wrote:
> 
> 
> Hi Mike,
> 
> I would put the ferrite at the end of the coax before it goes into the rig if 
> there were rf coming down the coax. Common mode energy can and will get on 
> the outside of the coax. I am not an expert on this, but I would expect that 
> any problem that would cause a transmitter to misbehave would  involve strong 
> levels most likely encountered near the antenna where the fields could be 
> high.   Of all the folks that have used that 5 element six meter yagi, (me 
> included) No one has ever had a stray RF problem. Running the coax 
> perpendicular to the elements and tied down to the boom is all that is needed 
> to keep things quiet.  I am at a loss to explain any other outcome.
> 
> I suppose there could be a fault in the balun area, but I would think that 
> the SWR would climb well above 1:1 in that case.
> 
> Dave K1WHS
> 
> On 10/31/2020 11:13 AM, M Cresap wrote:
>> Dave
>> 
>> So where is the optimum place to place the ferrites for this antenna if you 
>> have a problem like Alan described?
>> 
>> Does the near field extend roughly to half the stacking distance of that 
>> antenna (i.e. 6 feet or so), making that the best place for the ferrites?
>> 
>> Does a mostly vertical coax passing through the near field of a horizontally 
>> polarized antenna (i.e. an antenna side mounted to a tower) need ferrites?
>> 
>> Do you need to decouple ALL of the rest of your coaxes and control lines at 
>> the lower near field edge of that antenna (or at some other point)? I have 
>> heard that argument (decouple everything) made to improve performance of 
>> inverted L antennas on 160 meters located near a tower.
>> 
>> 73, Mike, W3IP
>> 
>> On Saturday, October 31, 2020, 10:04:48 AM EDT, David Olean 
>>  wrote:
>> 
>> 
>> Hello Alan
>> 
>> That was my antenna design. It has a teflon coax 1/2 wave balun that
>> kills RF on the shield side of the coax, but there is not much you can
>> do about near field energy getting picked up by the outside of the coax
>> due to radiation.  It is best to tape the coax down snugly along the
>> boom and masting etc.  Still, it does not hurt to add more RF chokes to
>> any antenna! It is pretty easy for RF energy to get impressed on the
>> outside of the coax in any typical installation.  The balun at the
>> antenna only keeps the energy from the coax center conductor from going
>> to the outside of the coax at the feedpoint.
>> 
>> The way I check for decoupling effectiveness is to match the antenna
>> really well, and then run your hand along the outside of the feedline
>> near the feed. While looking at the screen of a network analyzer, you
>> can see little perturbations in the return loss 20 or 30 dB down if
>> there is RF leaking to the outside of the feedline. This is a
>> qualitative test and you can estimate the bandwidth of the decoupling
>> network. You will see larger return loss change amounts away from the
>> resonant frequency of the decoupling element.  This won't apply to
>> ferrites, as they can be broadband, but with a quarter wave choke, or
>> similar, you can definitely see the effect.
>> 
>> 73
>> 
>> Dave K1WHS
>> 
>> On 10/31/2020 5:39 AM, N3ALN wrote:
>> 
>> > Hum, I was getting this HI CUR error only with my Directive Systems 6 Meter
>> > antenna (DS50-5) that has a 1:1 SWR I hope they know antenna design? Maybe
>> > not? The toroids fixed my issue. I just love how some of the forum or so
>> > judgmental, it is a only a freaking hobby, chill.
>> >
>> >
>> >
>> > --
>> > Sent from: http://elecraft.365791.n2.nabble.com/
>> > __
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>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:Elecraft@mailman.qth.net  
>> > >
>> >
>> > This list hosted by: http://www.qsl.net 
>> > 

Re: [Elecraft] HI CUR on 40

[David Olean]

Hi Mike,

I would put the ferrite at the end of the coax before it goes into the 
rig if there were rf coming down the coax. Common mode energy can and 
will get on the outside of the coax. I am not an expert on this, but I 
would expect that any problem that would cause a transmitter to 
misbehave would  involve strong levels most likely encountered near the 
antenna where the fields could be high.   Of all the folks that have 
used that 5 element six meter yagi, (me included) No one has ever had a 
stray RF problem. Running the coax perpendicular to the elements and 
tied down to the boom is all that is needed to keep things quiet.  I am 
at a loss to explain any other outcome.


I suppose there could be a fault in the balun area, but I would think 
that the SWR would climb well above 1:1 in that case.


Dave K1WHS

On 10/31/2020 11:13 AM, M Cresap wrote:

Dave

So where is the optimum place to place the ferrites for this antenna 
if you have a problem like Alan described?


Does the near field extend roughly to half the stacking distance of 
that antenna (i.e. 6 feet or so), making that the best place for the 
ferrites?


Does a mostly vertical coax passing through the near field of a 
horizontally polarized antenna (i.e. an antenna side mounted to a 
tower) need ferrites?


Do you need to decouple ALL of the rest of your coaxes and control 
lines at the lower near field edge of that antenna (or at some other 
point)? I have heard that argument (decouple everything) made to 
improve performance of inverted L antennas on 160 meters located near 
a tower.


73, Mike, W3IP

On Saturday, October 31, 2020, 10:04:48 AM EDT, David Olean 
 wrote:



Hello Alan

That was my antenna design. It has a teflon coax 1/2 wave balun that
kills RF on the shield side of the coax, but there is not much you can
do about near field energy getting picked up by the outside of the coax
due to radiation.  It is best to tape the coax down snugly along the
boom and masting etc.  Still, it does not hurt to add more RF chokes to
any antenna! It is pretty easy for RF energy to get impressed on the
outside of the coax in any typical installation.  The balun at the
antenna only keeps the energy from the coax center conductor from going
to the outside of the coax at the feedpoint.

The way I check for decoupling effectiveness is to match the antenna
really well, and then run your hand along the outside of the feedline
near the feed. While looking at the screen of a network analyzer, you
can see little perturbations in the return loss 20 or 30 dB down if
there is RF leaking to the outside of the feedline. This is a
qualitative test and you can estimate the bandwidth of the decoupling
network. You will see larger return loss change amounts away from the
resonant frequency of the decoupling element.  This won't apply to
ferrites, as they can be broadband, but with a quarter wave choke, or
similar, you can definitely see the effect.

73

Dave K1WHS

On 10/31/2020 5:39 AM, N3ALN wrote:

> Hum, I was getting this HI CUR error only with my Directive Systems 
6 Meter
> antenna (DS50-5) that has a 1:1 SWR I hope they know antenna design? 
Maybe

> not? The toroids fixed my issue. I just love how some of the forum or so
> judgmental, it is a only a freaking hobby, chill.
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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> Message delivered to k1...@metrocast.net 

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Re: [Elecraft] HI CUR on 40

[Jim Brown]

On 10/31/2020 2:39 AM, N3ALN wrote:

I just love how some of the forum or so
judgmental, it is a only a freaking hobby, chill.


NOT judgemental, but an attempt by those of us who understand how stuff 
actually works to share that with others (the several thousand hams who 
read this and other email reflectors) so that false ideas and solutions 
are less likely to be accepted and propagated.


Anyone who doesn't want to learn is welcome to use their delete key on 
my posts.


73, Jim K9YC
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Re: [Elecraft] HI CUR on 40

[M Cresap via Elecraft]

 Dave
So where is the optimum place to place the ferrites for this antenna if you 
have a problem like Alan described? 

Does the near field extend roughly to half the stacking distance of that 
antenna (i.e. 6 feet or so), making that the best place for the ferrites? 

Does a mostly vertical coax passing through the near field of a horizontally 
polarized antenna (i.e. an antenna side mounted to a tower) need ferrites?

Do you need to decouple ALL of the rest of your coaxes and control lines at the 
lower near field edge of that antenna (or at some other point)? I have heard 
that argument (decouple everything) made to improve performance of inverted L 
antennas on 160 meters located near a tower.

73, Mike, W3IP

On Saturday, October 31, 2020, 10:04:48 AM EDT, David Olean 
 wrote:  
 
 Hello Alan

That was my antenna design. It has a teflon coax 1/2 wave balun that 
kills RF on the shield side of the coax, but there is not much you can 
do about near field energy getting picked up by the outside of the coax 
due to radiation.  It is best to tape the coax down snugly along the 
boom and masting etc.  Still, it does not hurt to add more RF chokes to 
any antenna! It is pretty easy for RF energy to get impressed on the 
outside of the coax in any typical installation.  The balun at the 
antenna only keeps the energy from the coax center conductor from going 
to the outside of the coax at the feedpoint.

The way I check for decoupling effectiveness is to match the antenna 
really well, and then run your hand along the outside of the feedline 
near the feed. While looking at the screen of a network analyzer, you 
can see little perturbations in the return loss 20 or 30 dB down if 
there is RF leaking to the outside of the feedline. This is a 
qualitative test and you can estimate the bandwidth of the decoupling 
network. You will see larger return loss change amounts away from the 
resonant frequency of the decoupling element.  This won't apply to 
ferrites, as they can be broadband, but with a quarter wave choke, or 
similar, you can definitely see the effect.

73

Dave K1WHS

On 10/31/2020 5:39 AM, N3ALN wrote:

> Hum, I was getting this HI CUR error only with my Directive Systems 6 Meter
> antenna (DS50-5) that has a 1:1 SWR I hope they know antenna design? Maybe
> not? The toroids fixed my issue. I just love how some of the forum or so
> judgmental, it is a only a freaking hobby, chill.
>
>
>
> --
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Re: [Elecraft] HI CUR on 40

[David Olean]

Hello Alan

That was my antenna design. It has a teflon coax 1/2 wave balun that 
kills RF on the shield side of the coax, but there is not much you can 
do about near field energy getting picked up by the outside of the coax 
due to radiation.  It is best to tape the coax down snugly along the 
boom and masting etc.  Still, it does not hurt to add more RF chokes to 
any antenna! It is pretty easy for RF energy to get impressed on the 
outside of the coax in any typical installation.  The balun at the 
antenna only keeps the energy from the coax center conductor from going 
to the outside of the coax at the feedpoint.


The way I check for decoupling effectiveness is to match the antenna 
really well, and then run your hand along the outside of the feedline 
near the feed. While looking at the screen of a network analyzer, you 
can see little perturbations in the return loss 20 or 30 dB down if 
there is RF leaking to the outside of the feedline. This is a 
qualitative test and you can estimate the bandwidth of the decoupling 
network. You will see larger return loss change amounts away from the 
resonant frequency of the decoupling element.  This won't apply to 
ferrites, as they can be broadband, but with a quarter wave choke, or 
similar, you can definitely see the effect.


73

Dave K1WHS

On 10/31/2020 5:39 AM, N3ALN wrote:


Hum, I was getting this HI CUR error only with my Directive Systems 6 Meter
antenna (DS50-5) that has a 1:1 SWR I hope they know antenna design? Maybe
not? The toroids fixed my issue. I just love how some of the forum or so
judgmental, it is a only a freaking hobby, chill.



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Re: [Elecraft] HI CUR on 40

[N3ALN]

Hum, I was getting this HI CUR error only with my Directive Systems 6 Meter
antenna (DS50-5) that has a 1:1 SWR I hope they know antenna design? Maybe
not? The toroids fixed my issue. I just love how some of the forum or so
judgmental, it is a only a freaking hobby, chill. 



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Re: [Elecraft] HI CUR on 40

[Bert]

It's really sad to see how some companies prey on people who don't have 
the knowledge or the experience.

This is only one example!
Bert VE3NR


On 2020-10-30 13:31, Jim Brown wrote:

On 10/30/2020 3:43 AM, N3ALN wrote:
HI, I get this kit from Palomore for the K3 and I got another for my 
Yaesu
Quadra VL-1000. Take a good look at their website for what you will 
need.


https://palomar-engineers.com/ferrite-products/ferrite-cores/Elecraft-Transceiver-RFI-Kits-c46846169 





Total BS. They're trying to sell you stuff. NONE of this is necessary. 
What IS critical is antenna design, how they are fed, simple bonding, 
and the use of chokes at the feedpoint of each antenna.


For bonding, study http://k9yc.com/GroundingAndAudio.pdf

For chokes, study http://k9yc.com/2018Cookbook.pdf

For antennas, study the ARRL Handbook and Antenna Book.

Note that I'm not selling anything. :)

73, Jim K9YC


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Re: [Elecraft] HI CUR on 40

[Jim Brown]

On 10/30/2020 3:43 AM, N3ALN wrote:

HI, I get this kit from Palomore for the K3 and I got another for my Yaesu
Quadra VL-1000. Take a good look at their website for what you will need.

https://palomar-engineers.com/ferrite-products/ferrite-cores/Elecraft-Transceiver-RFI-Kits-c46846169



Total BS. They're trying to sell you stuff. NONE of this is necessary. 
What IS critical is antenna design, how they are fed, simple bonding, 
and the use of chokes at the feedpoint of each antenna.


For bonding, study http://k9yc.com/GroundingAndAudio.pdf

For chokes, study http://k9yc.com/2018Cookbook.pdf

For antennas, study the ARRL Handbook and Antenna Book.

Note that I'm not selling anything. :)

73, Jim K9YC


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Re: [Elecraft] HI CUR on 40

[Jim Rhodes]

Ferrites are probably not the answer here. Problem showed up with no
changes in configuration, and problem happens with a dummy load. Plus I
have ferrites in most of those locations already. This only happens on 40
meters and happens both with antenna connected and when dummy load
connected.

On Fri, Oct 30, 2020 at 5:43 AM N3ALN  wrote:

> HI, I get this kit from Palomore for the K3 and I got another for my Yaesu
> Quadra VL-1000. Take a good look at their website for what you will need.
>
>
> https://palomar-engineers.com/ferrite-products/ferrite-cores/Elecraft-Transceiver-RFI-Kits-c46846169
>
>
>
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Re: [Elecraft] HI CUR on 40

[N3ALN]

HI, I get this kit from Palomore for the K3 and I got another for my Yaesu
Quadra VL-1000. Take a good look at their website for what you will need. 

https://palomar-engineers.com/ferrite-products/ferrite-cores/Elecraft-Transceiver-RFI-Kits-c46846169



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Re: [Elecraft] HI CUR on 40

[William Ellis via Elecraft]

Which tortoise did get and from whom?

73

Bill, WB9CAC

Sent from my iPhone

> On Oct 30, 2020, at 2:19 AM, N3ALN  wrote:
> 
> I was getting this HI CUR message to and it was driving me CRAZY! I called
> Elecraft and I was going to send my K3 back to them and then I saw a few
> YouTube videos and I installed a TON of toroids on the K3 and Amp and every
> wire in my shack and no more HI CUR message. Best of luck!
> 
> 
> 
> --
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Re: [Elecraft] HI CUR on 40

[N3ALN]

I was getting this HI CUR message to and it was driving me CRAZY! I called
Elecraft and I was going to send my K3 back to them and then I saw a few
YouTube videos and I installed a TON of toroids on the K3 and Amp and every
wire in my shack and no more HI CUR message. Best of luck!



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[Elecraft] HI CUR on 40

[Jim Rhodes]

Today I find that I get a HI CUR error when transmitting at just a little
over 50 watts. Switched to a DL and find that on 40 meters my K3 draws more
current at 50 watts than it does on all the other bands. This is with the
tuner bypassed and hooked to one of my old cantennas. SWR shows flat on 40
and all other bands So I am guessing band pass filter issues. Has anyone
else had a similar experience with one band being way out of whack?

-- 
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Re: [Elecraft] HI CUR error on 6M

[IK4EWX]

Have you tried to insert the K3 ATU and see if it solved?

Ian IK4EWX



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[Elecraft] HI CUR error on 6M

[N3ALN]

 I have a K3 and on 6 meters on FT8 at 100W I get a HI CUR error and not at
95W or less and I have run the K3 utility at re-calibrate the transmitter at
5W and 50W. What else should I do?

thanks

Alan N3ALN



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[Elecraft] HI CUR error

[N3ALN]

I have a K3 and on 6 meters on FT8 at 100W I get a HI CUR error and I have
run the K3 utility at re-calibrate the transmitter at 5W and 50W. What else
should I do?

thanks

Alan N3ALN




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[Elecraft] HI CUR error

[N3ALN]

I have a K3 and on 6 meters on FT8 at 100W I get a HI CUR error and I have
run the K3 utility at re-calibrate the transmitter at 5W and 50W. What else
should I do?

thanks

Alan N3ALN



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[Elecraft] Hi Cur and Hi SWR using KX3 2 meter Module

[John Sager via Elecraft]

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Re: [Elecraft] Hi Cur and Hi SWR using KX3 2 meter Module

[Jack F6AJW]

 No text except title?

I have the same issue on my KX3-2m: Hi-Current blinking even on dummy 
load but 3 W output still available . Having a loose SMA connector , I 
had to open KX3 and extract 2m card in order to tighten SMA nut (very 
annoying!) . I found it was convenient to use a short piece of coax 
cable with SMA male connector and N female (or what you want) at the 
other end in order to avoid stress on SMA female on KX3 .


KX3-2M is very sensitive but a lot of birdies presents so this is not 
very compatible with weak signals reception, even using transverters in 
front adding noise masking the weakest ones compared to my IC-7400 and 
other transceivers . My DB6NT microwave transverters are well driven 
into TX using + TX available on SMA inner conductor; very good point! 
Another issue I have  is a sort of microphone effect in RX ; not sure 
this is the right words ?


Any help?

73's.

Jacques F6AJW/IN93EK



Le 01/08/2015 15:18, John Sager via Elecraft a écrit :

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---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel 
antivirus Avast.
https://www.avast.com/antivirus




---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel 
antivirus Avast.
https://www.avast.com/antivirus

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[Elecraft] Hi Cur

[Robert 'RC' Conley]

how can a K3 have a Hi Cur display while in the receive mode?
The K3 mutes slightly when Hi Cur is displayed
KC5WA

-- 

Wiol ono

Ham Radio!
IT IS MY ADDICTION
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Re: [Elecraft] Hi Cur

[K4ia via Elecraft]

Does it draw current when turned off?  If so, you have a shorted final 
transistor.  

Craig Buck 

 On Jun 14, 2014, at 7:04 PM, Robert 'RC' Conley rc.kc...@gmail.com wrote:
 
 how can a K3 have a Hi Cur display while in the receive mode?
 The K3 mutes slightly when Hi Cur is displayed
 KC5WA
 
 -- 
 
 Wiol ono
 
 Ham Radio!
 IT IS MY ADDICTION
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[Elecraft] Hi Cur?

[Jim Miller]

While transmitting some JT9 at 100w on 6m yesterday and watching the
voltage display on the K3 menu I occasionally saw a HI CUR message which
then disappeared after less than a second.

I've never seen this before. I was monitoring the voltage after putting in
some new cabling from the PS and it has made the supply voltage more
stable. The K3 now reads no less than 12.5v while transmitting 100w.

Not sure where to start or just to forget about it until it shows a
persistent fault.

SWR is low and feedlines are 7/8 hardline so I don't think there's a fault
in those. If there was I'm sure it would be more evident with the KPA500 at
full tilt but there's no such indication.

I do have the KPA3 replacement pins kit which I've not yet installed. Is
this fault associated with those pin issues?

Thanks

Jim ab3cv
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Re: [Elecraft] Hi Cur?

[David G4DMP]

It depends what frequency you are using, Jim, but according to the
transmitter specification on page 9 of the Owner's Manual, the suggested
maximum power on 51-52 MHz is 85W.  For 100% duty cycle modes it might
be best to turn the power down a bit.

73 de David G4DMP

In a recent message, Jim Miller j...@jtmiller.com writes
While transmitting some JT9 at 100w on 6m yesterday and watching the
voltage display on the K3 menu I occasionally saw a HI CUR message which
then disappeared after less than a second.

-- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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Re: [Elecraft] Hi Cur?

[Jim Miller]

Dave

Nice catch! I was on 50.278 but I'll turn the wick down a bit unless using
the KPA500.

73

jim ab3cv


On Fri, Aug 9, 2013 at 10:47 AM, David G4DMP da...@g4dmp.fsnet.co.ukwrote:

 It depends what frequency you are using, Jim, but according to the
 transmitter specification on page 9 of the Owner's Manual, the suggested
 maximum power on 51-52 MHz is 85W.  For 100% duty cycle modes it might
 be best to turn the power down a bit.

 73 de David G4DMP

 In a recent message, Jim Miller j...@jtmiller.com writes
 While transmitting some JT9 at 100w on 6m yesterday and watching the
 voltage display on the K3 menu I occasionally saw a HI CUR message which
 then disappeared after less than a second.

 --
  + - - - - - - - - - - - - - - - - +
  | David M Pratt, Kippax, Leeds.   |
  | Website: http://www.g4dmp.co.uk |
  + - - - - - - - - - - - - - - - - +



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Re: [Elecraft] Hi Cur?

[Eric Swartz - WA6HHQ, Elecraft]

Jim,

What is your power supply voltage as reported by the K3 when transmitting? As 
power supply voltage drops the K3 increases current in order to put out the 
requested power. If the voltage is dropping too low this can result in the 
hi-cur message.


Also, the threshold for the hi-cur message is adjustable in theK3's tech mode 
menu, I believe.


73,

Eric
elecraft.com

On 8/9/2013 7:23 AM, Jim Miller wrote:

While transmitting some JT9 at 100w on 6m yesterday and watching the
voltage display on the K3 menu I occasionally saw a HI CUR message which
then disappeared after less than a second.

I've never seen this before. I was monitoring the voltage after putting in
some new cabling from the PS and it has made the supply voltage more
stable. The K3 now reads no less than 12.5v while transmitting 100w.

Not sure where to start or just to forget about it until it shows a
persistent fault.

SWR is low and feedlines are 7/8 hardline so I don't think there's a fault
in those. If there was I'm sure it would be more evident with the KPA500 at
full tilt but there's no such indication.

I do have the KPA3 replacement pins kit which I've not yet installed. Is
this fault associated with those pin issues?

Thanks

Jim ab3cv
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Re: [Elecraft] Hi Cur

[Barry]

U;ve seen it on occasion with my poorly matched wires.  Press the Auto Tune
button and it will go away.
Barry W2UP



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[Elecraft] Hi Cur

[Don Etters]

I just put up a new antenna and SWR is 18.1 on 10 meters when I put K3 in the 
tune mod a Hi Cur reading comes on the dispaly I have never seen this before is 
this normal with SWR of 18.1 ? I have run antenna’s with this amount of SWR 
but have never seen this HI Cur reading .

Don 
W4DEE
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Re: [Elecraft] Hi Cur

[Don Wilhelm]

Scott,

Was that on a K2 or a K3?  Please indicate in both the subject and the text.

Put a dummy load between the radio and the dummy load.  Tune into the 
dummy load.
After the TUNE completes, set the power to 40 or 50 watts and hold the 
key down for about 5 seconds.
Tell us how much power is actually being developed.

73,
Don W3FPR

On 8/19/2011 12:31 AM, Scott Weiss wrote:
 Hello to all,
Need some help. After finishing up on 80 cw last night I moved up to 20, 
 hit the auto tuner for the beam and received HI CUR. And this only ocurred on 
 20 even with a Dummy Load attached. Msg seemed to go away once I reduced the 
 wattage down around 60 watts. Hepl!!!
  73's,
 Scott N2WF
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[Elecraft] Hi Cur

[Scott Weiss]

Hello to all,
  Need some help. After finishing up on 80 cw last night I moved up to 20, hit 
the auto tuner for the beam and received HI CUR. And this only ocurred on 20 
even with a Dummy Load attached. Msg seemed to go away once I reduced the 
wattage down around 60 watts. Hepl!!!
73's,
   Scott N2WF
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Re: [Elecraft] Hi Cur

[Matt Zilmer]

Looks for an RFI problem that only occurs on 20m.  Or a grounding
problem, maybe with a long leg like 5m or so.  Nice resonant section
there.

matt W6NIA

On Fri, 19 Aug 2011 00:31:53 -0400, you wrote:

Hello to all,
  Need some help. After finishing up on 80 cw last night I moved up to 20, hit 
 the auto tuner for the beam and received HI CUR. And this only ocurred on 20 
 even with a Dummy Load attached. Msg seemed to go away once I reduced the 
 wattage down around 60 watts. Hepl!!!
73's,
   Scott N2WF
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[Elecraft] Hi Cur error on alignment part III, even at QRPp. 40m only. Rx is good.

[Hagood, Larry]

Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 40m 
Tx alignment, I instantly get HI Cur and the power drops to zero. This 
happens if the output power is set to anything above 0.3 watts. This only 
happens on 40 meters. I was able to peak the output on all the other bands 
normally.  The Cal Cur is set to 2.5. 
I've got the little RF probe built. could someone point me in the right 
direction as to where to look for the problem?  
Thank you verry much!
 
73,
AD5VM
 
Larry Hagood
KLA-Tencor 
Customer Service Engineer 
Intel Service Business Unit 
Mobile: 505-563-0338 
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Re: [Elecraft] Hi Cur error on alignment part III, even at QRPp. 40m only. Rx is good.

[Don Wilhelm]

Larry,

If it only happens on 40 meters you have some problem with the 40 meter 
Low Pass Filter.
Look at the schematic for RF Board sheet 3 toward the lower right and 
you will see the components associated with the 40/60 meter LPF - check 
them all for proper values, correct turns on toroids, good soldering, 
etc.  Include relay K12 as well.


73,
Don W3FPR

Hagood, Larry wrote:
Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 40m Tx alignment, I instantly get HI Cur and the power drops to zero. This happens if the output power is set to anything above 0.3 watts. This only happens on 40 meters. I was able to peak the output on all the other bands normally.  The Cal Cur is set to 2.5. 
I've got the little RF probe built. could someone point me in the right direction as to where to look for the problem?  
Thank you verry much!
 
73,

AD5VM

  

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RE: [Elecraft] Hi Cur error on alignment part III, even at QRPp. 40m only. Rx is good.

[Hagood, Larry]

Thanks Don! I checked every component in the 40/60m LPF, all caps are the 
correct value, both inductors have correct windings, hit all solder points 
again. Still have the same problem. 
Also,
On 40 meters, even with power output set to 1.0 watt. The current display 
shoots straight up to 2.5 (max) On all other bands with power set to 1.0 watt, 
the current only goes to about .95 
Also,
With the power output at 1.0 watt, I compared the RF out at the antenna jack. 
It's roughly the same for 40 and 30 meters, and I have no problem with 30 
meters. 
 
Larry Hagood




From: Don Wilhelm [mailto:[EMAIL PROTECTED]
Sent: Wed 4/23/2008 7:40 AM
To: Hagood, Larry
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Hi Cur error on alignment part III, even at QRPp. 40m 
only. Rx is good.



Larry,

If it only happens on 40 meters you have some problem with the 40 meter
Low Pass Filter.
Look at the schematic for RF Board sheet 3 toward the lower right and
you will see the components associated with the 40/60 meter LPF - check
them all for proper values, correct turns on toroids, good soldering,
etc.  Include relay K12 as well.

73,
Don W3FPR

Hagood, Larry wrote:
 Hi folks. I'm finishing a new K2 for a friend. When I tried to perform the 
 40m Tx alignment, I instantly get HI Cur and the power drops to zero. This 
 happens if the output power is set to anything above 0.3 watts. This only 
 happens on 40 meters. I was able to peak the output on all the other bands 
 normally.  The Cal Cur is set to 2.5.
 I've got the little RF probe built. could someone point me in the right 
 direction as to where to look for the problem? 
 Thank you verry much!
 
 73,
 AD5VM

  


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[Elecraft] HI CUR question

[Larry Naumann]

I sometimes get a HI CUR warning on my new K2. I have the high current set at 
2.5 amps. My power supply is steady but on 40 meters when the SWR is slightly 
high but below 2:1, I get a HI CUR when running 10 watts out. Into a good 50 
ohm dummy load I get 2.02 amps on 40 meters. 
 I've double checked my output filter tuning and all is good. 
Is this something to be concerned about or is this in the normal range of xmit 
current at 10 watts?
Larry Naumann  N0SA
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Re: [Elecraft] HI CUR question

[Don Wilhelm]

Larry,

The bare K2 (no KAT2, no KPA100, no KAT100) will respond like that if 
the antenna load has an impedance less than 50 ohms - it is not likely 
to happen when the antenna feedpoint impedance is higher than 50 ohms.


It all has to do with the way the basic K2 handles its power control - 
it assumes that the load is 50 ohms and measures the RF Voltage at its 
output and adjusts the power until it is correct (or runs out of gain).  
When the impedance at the K2 output is lower than 50 ohms, it takes more 
power to produce the required RF voltage, so your K2 puts out more power 
- however the K2 does not know it is producing more power because the RF 
voltage is still low.


Your Hi Cur messages are the result the K2 producing this higher power 
level.
Conversely, if your antenna feedpoint impedance were higher than 50 
ohms, the K2 would not actually be producing as much power as it thinks 
it is, and you would see a lower current.


This condition is not likely to damage the K2, but if you want real 
power output indication you will have to use a tuner of some sort to 
produce a 50 ohm resistive load for the K2.  The KAT2 or KAT100 will do 
that, and also have a real wattmeter included so the K2 power control 
circuits will not be dependent on the SWR.


73,
Don W3FPR

Larry Naumann wrote:
I sometimes get a HI CUR warning on my new K2. I have the high current set at 2.5 amps. My power supply is steady but on 40 meters when the SWR is slightly high but below 2:1, I get a HI CUR when running 10 watts out. Into a good 50 ohm dummy load I get 2.02 amps on 40 meters. 
 I've double checked my output filter tuning and all is good. 
Is this something to be concerned about or is this in the normal range of xmit current at 10 watts?


  

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[Elecraft] HI CUR on 15 meters

[Kirk Brown]

I  get a HI CUR warning on 15 meters when connected to my 40 meter dipole. I
can only run about 7 Watts before the limit (2.5 amps) is reached. I am
getting full output (12 Watts) and about 2.25 amps draw when the dummy load
is connected. My SWR is ok on 15--about 1.4:1--and I am getting out ok. 40
is fine. I have some TVI issues on 15 but I think that is a separate issue.
This is a stock K2 with no upgrades.
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RE: [Elecraft] HI CUR on 15 meters

[Don Wilhelm]

Kirk,

There are several possibilities.

On the K2 side, you could have one too many turns on L23 and/or L24 causing
the LPF to be tuned a bit too low.  This usually shows up with a test on a
dummy load, but is worth checking anyway.

At your antenna, the SWR alone does not tell the whole story - what is the
resistance and the reactance when measured with an antenna analyzer?  If
there is a significant amount of reactance, it could de-tune the low pass
filter in the K2, and if the resistive element is not near 50 ohms, that
will also tend to cause problems.

If the Low Pass filter is found to be OK, you could try lengthing or
shortening your feedline and electrical 1/8 wavelength for 15 meters at a
time (up to 3/8 wavelength total) to see if you can achieve a feedpoint
impedance that will work better.  You could also use an antenna tuner with
that antenna.

73,
Don W3FPR

 -Original Message-

 I  get a HI CUR warning on 15 meters when connected to my 40
 meter dipole. I
 can only run about 7 Watts before the limit (2.5 amps) is reached. I am
 getting full output (12 Watts) and about 2.25 amps draw when the
 dummy load
 is connected. My SWR is ok on 15--about 1.4:1--and I am getting out ok. 40
 is fine. I have some TVI issues on 15 but I think that is a
 separate issue.
 This is a stock K2 with no upgrades.

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[Elecraft] HI CUR on 15 meters

[Cathy James]

While experimenting with 15 meters today, I noticed that when 
transmitting a CQ at 10 watts, HI CUR would appear intermittently on the 
display.  I have never seen this on the lower bands (20 meters and down) 
where I do 99% of my operating.  Turning the power down to 8 watts on 15 
meters makes the problem go away.


Any ideas?  Do I just have the threshold set too low?

BTW, thanks to those who pointed out, in response to my earlier question 
about silence on 20 meters, that the problem was likely just propagation 
rather than the unit.  They were definitely correct, and I've worked a 
lot of 20 meter contacts since then.


Cathy
N5WVR

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RE: [Elecraft] HI CUR on 15 meters

[Don Wilhelm]

Cathy,

There could be a variety of reasons for a Hi Cur - one is simply that your
threshold is too low, or it could be associated with the particular load
that the antenna presents to the K2 or it could be a problem with the low
pass filter in the K2, or it could be your power supply voltage.

I suggest that you check with a dummy load first to eliminate the antenna
consideration - compare the current drawn at 10 watts on 15 meters with the
current drawn on 20 and 17 as well as the current on 12 and 10 meters.

If your CAL CUR threshold is set less than 2.5 amps then that alone can be
adequate explaination - you can safely increase the CAL CUR level up to 3.5
or even a bit more if need be.  If your power supply voltage is low, you
will need to set the CAL CUR a bit higher than normal - 13.8 volts is
considered normal.  Check during a full power transmit to be sure you do not
have excessive voltage drop in the cable to the K2.

73,
Don W3FPR

 -Original Message-

 While experimenting with 15 meters today, I noticed that when
 transmitting a CQ at 10 watts, HI CUR would appear intermittently on the
 display.  I have never seen this on the lower bands (20 meters and down)
 where I do 99% of my operating.  Turning the power down to 8 watts on 15
 meters makes the problem go away.

 Any ideas?  Do I just have the threshold set too low?

 BTW, thanks to those who pointed out, in response to my earlier question
 about silence on 20 meters, that the problem was likely just propagation
 rather than the unit.  They were definitely correct, and I've worked a
 lot of 20 meter contacts since then.

 Cathy
 N5WVR

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[Elecraft] HI CUR and 160 Meters

[John Huffman]

While waiting for parts to fix my KPA100 and KAT100, I was checking out 
my K160RX.


The situation is that at 12W out the K2 (KSB2, KNB2, KDSP2, K106RX, 
KIO2) draws 2.5 amps.  With power set at anything above that, it exceeds 
4.5 amps and I get a Hi CUR warning (limit set at 4.5 amps).


Current is a bit higher than expected on 80 meters at 3.2 amps max 
output.  Other bands 2.9 - 2.9 amps.


I wonder what would cause the jump?

73 de K1ESE
John
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Re: [Elecraft] HI CUR and 160 Meters

[Tom Hammond]

Different problem when he doesn't have a KPA100 though.

Tom

At 04:53 PM 11/22/2006, Fred Jensen wrote:

John Huffman wrote:
The situation is that at 12W out the K2 (KSB2, KNB2, KDSP2, K106RX, 
KIO2) draws 2.5 amps.  With power set at anything above that, it 
exceeds 4.5 amps and I get a Hi CUR warning (limit set at 4.5 amps).


Parasitic?  I had that problem on 40m with the KPA100 and 
KAT100.  Ran OK at lower power (~15W - 25W) but went berserk at 
higher power.  It even blew the 12V DC line fuse once.  Gary fixed 
it but I'm not sure what he did.


Fred K6DGW
Auburn CA CM98lw
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RE: [Elecraft] HI CUR and 160 Meters

[Don Wilhelm]

John,

How much power is actually being produced?  What does the K2 meter indicate
in TUNE?
What is your power supply voltage under this 4.5 amp load?  If the voltage
drops significantly, the current will go up - the K2 tries to provide the
requested power out, and if the voltage drops, the current must increase.

If you can eliminate power supply voltage drop problems, then you could have
some sort of oscillation present.  The K2 is quite stable if all the
components are correct.  You could start by checking T1, T2 and T4
(especially T4).  The only other thing that I can think of right now are the
components in the base circuit of Q7 and Q8, but I cannot relate to a jump
in current draw if those components were at fault.

Check th evoltage on the base of Q7 and Q8 when transmitting - it should be
0.6 volts or very close.

73,
Don W3FPR

 -Original Message-

 While waiting for parts to fix my KPA100 and KAT100, I was checking out
 my K160RX.

 The situation is that at 12W out the K2 (KSB2, KNB2, KDSP2, K106RX,
 KIO2) draws 2.5 amps.  With power set at anything above that, it exceeds
 4.5 amps and I get a Hi CUR warning (limit set at 4.5 amps).

 Current is a bit higher than expected on 80 meters at 3.2 amps max
 output.  Other bands 2.9 - 2.9 amps.

 I wonder what would cause the jump?

 73 de K1ESE
 John


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[Elecraft] Hi Cur

[nr5a]

I was getting a Hi Cur warning on my K2 tonite. Any helpful hints on what to
look for?? I fired my K2 up tonite on PSK and noticed its only putting about
3 watts out. Double checked it and its all modes, and all bands even tho the
power is set to 5 watts. RF leds only go to 3, usually goes to 5. It was
working just fine this afternoon (famous last words). I won't be able to do
any troubleshooting till tomorrow nite, was wonder where to start looking?

Jerry - NR5A - South Dakota 


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[Elecraft] HI CUR reading

[Sanger, Joseph]

My K2, which is newly built but was working fine ... spontaneously has
started giving me a HI CUR reading even whenever I hit the TUNE button,
even when going into a dummy load  Regardless of the setting of the
power output control ...  ( the CAL CUR limit is set to 3.5).  any
advice as to where to start looking for a problem?  Thanks.


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[Elecraft] Hi-Cur problem

[Ron W]

Hi,
 I have been building a K2/100 for a friend, and it has all been going 
very smoothlyuntil tonight.
I had the amp installed and it put out the output it should on all bands, 
but I didn't have the power calibration as good as I liked so I took the 
amp out, removed the shield and set it up along-side the K2 ready to adjust.
Set to 5w, press tune on 40m and the HI-CUR warning comes up. I then find 
it does that on *all* bands EXCEPT 80m.

I take things apart and find it is a problem in the basic K2 ( #4506)
Time for bed here and I am not thinking straight, but that has me bluffed 
at present.
I am assuming the problem is most likely in the LPF as the amplifier must 
be looking into a short or open cct.
Can anyone come up with a thought or two as to what has gone wrong? The 
relays seem to be switching as I change bands.
I have been over both sides of the RF board with a head-band magnifier...it 
eludes me at present!

Cheers...Ron ZL1TW

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Re: [Elecraft] Hi-Cur problem

[W3FPR - Don Wilhelm]

Ron,

If you are certain it was producing near to full output with the KPA100 
installed, then I would conclude that something happened when you removed 
the KPA100.


I would be looking for something like a short in the coax or its connector 
or something equally 'dumb' like that.  OTOH, Hi-CUR usually does indicate a 
problem with the LPF, but if it is showing up on all bands except 80 
meters --- that would mean that all the other low pass filters suddenly 
changed, and that is not probable.
Perhaps a bit of wire came loose as you removed the KPA100 - try a bit of 
'upside-down shaking'.


Did your power supply voltage sag somehow?  Do you still have a nice low 
resistance at the power connector?  Look for things of that nature before 
digging too deep into the K2 itself.


Perhaps it will be more clear after a bit of rest. Good luck!

73,
Don W3FPR

- Original Message - 


Hi,
 I have been building a K2/100 for a friend, and it has all been going 
very smoothlyuntil tonight.
I had the amp installed and it put out the output it should on all bands, 
but I didn't have the power calibration as good as I liked so I took the 
amp out, removed the shield and set it up along-side the K2 ready to 
adjust.
Set to 5w, press tune on 40m and the HI-CUR warning comes up. I then find 
it does that on *all* bands EXCEPT 80m.

I take things apart and find it is a problem in the basic K2 ( #4506)
Time for bed here and I am not thinking straight, but that has me bluffed 
at present.



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[Elecraft] Hi Cur, low power on 17m

[QSKguy]

Hi all,
I just finished my K2 and have a problem on 17m band. All is working fine,  I 
got about 15 watts on each band and a bit less on 10m but on 17m, the display 
 shows Hi Cur and output power is less than 1 watt... It appears only on 17m  
band.
I have checked solders, they seem to be ok.
Any idea ?
Thanks, 73
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Re: [Elecraft] Hi Cur, low power on 17m

[Don Brown]

Hi

One more thing to check is the trimmers. Did you mix up the trimmers. the ones 
for the 17 meters do NOT have a red dot on them. The trimmers for 20 meters 
have a red dot. If you mixed up one or more of them you could have this 
symptom. It is also possible that the VCO is running a the wrong frequency due 
to a bad solder joint or wrong cap in the or around the VCO relay area. I had a 
K2 with a high current on one band problem that turned out to be the VCO 
running at the wrong frequency.

Don Brown
KD5NDB



  - Original Message - 
  From: W3FPR - Don Wilhelmmailto:[EMAIL PROTECTED] 
  To: [EMAIL PROTECTED]mailto:[EMAIL PROTECTED] ; 
elecraft@mailman.qth.netmailto:elecraft@mailman.qth.net 
  Sent: Monday, December 06, 2004 9:01 AM
  Subject: Re: [Elecraft] Hi Cur, low power on 17m


  The only thing that is unique to 17 meters and not used on another band is 
  the VCO and the bandpass trimmers C32 and C34.

  SNIP
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Re: [Elecraft] HI CUR LIMIT

[Don Wilhelm]

You will probably have to find the correct value by trial and error.  I 
would recommend setting CAL CUR to 4.0 (which conforms to the 'at least 3.5' 
instruction) - or even more and then lower it one step at a time until the 
message re-appears - more likely on 10, 12 or 15 meters.  The actual setting 
will depend heavily on your power supply voltage - lower PS voltage requires 
a higher CAL CUR setting.


Once set in that manner, it serves as a quick indicator that the power 
should be reduced - because the SWR is higher than it should be, or the 
power supply voltage has dropped, etc.

This is normally not an indication of a K2 problem.

73,
Don W3FPR

- Original Message - 

On my K2/100 I have set the HI CUR to 3.5 but get warnings on some higher 
bands.  The manual says HI CUR should be set to at least 3.5.  Can anyone 
recommend what a typical value should be and what value I should not go 
beyond.

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Re: [Elecraft] HI CUR LIMIT

[John Huffman]

After adding the KPA100 I had some HI CUR warnings.  After a few emails back and
forth, I set my CAL CUR to 4.1 and its been that way for over a year and a few
thousand QSOs.

MYMV.

73 de NA8M
John

 On my K2/100 I have set the HI CUR to 3.5 but get warnings on some higher
 bands.  The manual says HI CUR should be set to at least 3.5.  Can anyone
 recommend what a typical value should be and what value I should not go
 beyond.

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[Elecraft] HI CUR LIMIT

[Patrick DalPorto]

On my K2/100 I have set the HI CUR to 3.5 but get warnings on some higher 
bands.  The manual says HI CUR should be set to at least 3.5.  Can anyone 
recommend what a typical value should be and what value I should not go beyond.
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