[Elecraft] Is my K2 XMIT Current High?

Sun Jun 15 15:04:01 2003

Hi Brian,

Double check the turns on T4 since that does affect the efficiency.

I measured 1.6A at 5W and 2.0A at 10W.  5 or 10% higher is probably ok.
The current reading is affected by the option boards too since the K2 current display includes the receiver and the option board
current. In my case, when the transmitter is not keyed, the DC current is 0.20A.

Unless you're operating off batteries, the efficiency isn't too critical. The main thing is if your running 10W out, you don't want
the power transistors to overheat.  I calculated about 50% efficiency at 10W, so the final is dissipating 10W as heat.  In CW mode,
the bottom cover doesn't get unreasonably warm.

73/ Bob - AG5Q

----- Original Message -----
From: "Brian Wruble" <[email protected]>
To: <[email protected]>
Sent: Saturday, June 14, 2003 8:26 PM
Subject: [Elecraft] Is my K2 XMIT Current High?

> Hi all:  We are in the Alignment and Test, Part III, 40 Meter
> Transmitter Alignment.  This is a "version A" K2.  Current at 5 watts
> transmit power is supposed to be 1.3 to 1.6 amps.  We have 1.7.
>
> Current at 10 watts is supposed to be 1.8 to 2 amps. We have 2.2 amps.
> The instructions send you to troubleshooting if the current is "much
> higher than 1.6 amps" or "much higher than 2.0 amps".
>
> Are 1.7 and 2.2 "much higher" or within the range of normal?  Thanks de
> Brian W3BW and Zane W2YL