Power drain of KX3 on TX

[Ignacy]

How many amps does KX3 draw on transmit at 10 and 5 W?
Ignacy

[wayne burdick]

When the power supply is over 11 V, current drain is typically 1 A at  
5 W in CW, FM, and FSK-D modes and 1.5 A in other modes. Below 11 V,  
all modes are about the same. (The reason current drain goes down  
above 11 V in these modes is that we switch in a higher-impedance  
winding on the PA output transformer.)

At 10 W it's typically 1.8-2 A in all modes.

If the SWR seen by the transmitter is high, current drain might be  
higher depending on the load impedance. Backlight on/off, preamp on/
off, and isolation amp on/off also affect current drain a bit.

73,
Wayne
N6KR



On Jul 30, 2012, at 7:15 AM, Ignacy wrote:

> How many amps does KX3 draw on transmit at 10 and 5 W?
> Ignacy
>
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