[Elecraft] [KX3] Power Consumption

[Wayne Burdick]

With backlight on, RX current should be roughly 170 to 230 mA (no AF signal) depending on band.

TX current at 5.0 W should be about 1.0-1.4 A in CW/FM/FSK-D modes and 1.4-1.8 A in SSB/AM/PSK-D/DATA-A/AFSK-A modes. Actual current will vary with band and antenna load impedance.

The reason 5.0 W current drain is lower in CW/FM/FSK-D modes is that the KX3 uses its higher-impedance PA transformer winding at this level. The upper limit for use of the high-Z winding is 5.0 W in CW/FM/FSK-D and 3.0 W in all other modes. If you're above the limit for a given mode, the lower-Z winding is used to minimize transmit IMD at higher power levels.

73,
Wayne
N6KR


On Jan 9, 2015, at 1:44 PM, "Reilly, John" <reillyjf at comcast.net> wrote:

> Trying to do some planning for Field Day battery operation. We are planning to use a KX3 at 5w, CW.
> 
> Could someone(s) give me a feeling for RX current draw. I would like this to be with the Backlight ON, and other normally ON functions activated. Likewise, what current draw should we see with key down CW at 5w?
> 
> Thanks,
>  - 73, John, N0TA