[Elecraft] HI CURR indicator on K3S display

[Bob McGraw]

Well clearly one of the indications, radio or power supply, is incorrect.

Just checked mine:

TX @ 100 watts, radio display = 18.3 amps, Power supply = 19.0 amps.

Voltage:  Radio RX = 14.3, PS = 14.5.   Voltage:  TX Radio = 13.9v, PS 
=14.5v

If the power supply voltage drops during TX, the control circuit will 
attempt to produce 100 watts in which the current may increase.   Also, 
different bands at 100 watts will draw different amount of current 
during transmit.

I actually found with a 100 watt power setting on the radio, the actual 
output power was more than 120 watts.  (See the discussion on Power 
Calibration).  This would of course affect the current demand.

73

Bob, K4TAX


On 2/4/2022 2:16 AM, elecraft-request at mailman.qth.net wrote:
> Message: 4
> Date: Tue, 1 Feb 2022 18:12:38 -0600
> From: "Dr. William J. Schmidt"<bill at wjschmidt.com>
> To:<elecraft at mailman.qth.net>
> Subject: [Elecraft] HI CURR indicator on K3S display
> Message-ID:<006401d817c9$990051f0$cb00f5d0$@wjschmidt.com>
> Content-Type: text/plain;	charset="us-ascii"
>
> 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