[Elecraft] [POSSIBLE SPAM] RE: HI CURR indicator on K3S display

[Dr. William J. Schmidt]

5W RF power calibrates fine.  The 50W fails.  Gonna remove the 100W module today and see if I have a bad transistor…  Difficult to do here on the island… have not built up my test equipment stash here much more than a DVM and an antenna analyzer.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

 

email:   <mailto:bill at wjschmidt.com> bill at wjschmidt.com

 

 

From: Ray <wa6vab at gmail.com> 
Sent: Wednesday, February 2, 2022 12:55 AM
To: bill at wjschmidt.com; elecraft at mailman.qth.net
Subject: [POSSIBLE SPAM] RE: [Elecraft] HI CURR indicator on K3S display

 

Dr William………. 

Time to hook your radio up to a 50 Ohm Dummy Load, and Retake readings.

Ray WA6VAB  K3

 

 

From: Dr. William J. Schmidt <mailto:bill at wjschmidt.com> 
Sent: Tuesday, February 1, 2022 6:40 PM
To: elecraft at mailman.qth.net <mailto:elecraft at mailman.qth.net> 
Subject: Re: [Elecraft] HI CURR indicator on K3S display

 

Unfortunately, my metering outside of the radio shows only 10.1 amps when the radio shows 20+ amps.  Radio and outboard voltage metering showing 13.0 VDC.  Also shown 6.6A for 5W out.  Something is up.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

 

email:  bill at wjschmidt.com <mailto:bill at wjschmidt.com> 

 

 

-----Original Message-----

From: William Ferry <jdbf918 at comcast.net <mailto:jdbf918 at comcast.net> > 

Sent: Tuesday, February 1, 2022 7:01 PM

To: bill at wjschmidt.com <mailto:bill at wjschmidt.com> 

Subject: Re: [Elecraft] HI CURR indicator on K3S display

 

I recently had a problem where both my K3’s were taking over 30Amps (PS) and at times the K3 shut down.  

Surprisingly it happened with two different K3’s and two different power supplies (Astron RS 35 and M).  The K3 displays all read just over 20 Amps at near 100w output into a dummy load on both units.  I checked with Elecraft and they had high confidence the current read by the K3 was correct.

I decided to borrow a clamp-on Ammeter to measure the DC current independently. 

Yup. 20+ amps (like the K3)before it shut down.  

I found both supplies had issues.  One the current limit was set too low.  The other the current sensing resistor had been changed to the wrong value.  Plus the current meter were not calibrated correctly.  

Hence I suggest you find a meter to independently measure the power supply.

Regards,

Bill

K1BZM

PS I think we have worked on all bands from 80-6!

 

 

 

Sent from my iPhone

 

> On Feb 1, 2022, at 7:14 PM, Dr. William J. Schmidt <bill at wjschmidt.com <mailto:bill at wjschmidt.com> > wrote:

> 

> I remember some discussion about HI CURR issues and the causes here a 

> while ago.  I just noticed it on my radio.. Changing the display to 

> read amps, it indicates 21.6 amps, but the amp meter on the power 

> supply is only showing

> 10.1 amps.  The radio sensing circuit seems to be in error.  Anyone 

> else delt with this?

> 

> 

> 

> 

> 

> Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ 

> PJ2/K9HZ VP2EHZ

> 

> 

> 

> email:   <mailto:bill at wjschmidt.com> bill at wjschmidt.com <mailto:bill at wjschmidt.com> 

> 

> 

> 

> 

> 

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