[Elecraft] K3 Voltage drop

[ab2tc]

Hi,

Your current also seems high. Here is what I get on the 3 bands I use the
most:

RX voltage reads 14.1V current 0.85A
TX RTTY power set to 100W:
10m 100W 13.7V 14.5A
15m 102W 13.6V 15.5A 
20m 105W 13,6V 17.5A

Power is measured by LP-100A (factory calibrated) into precision dummy load,
voltage and current from the K3 display.

The power supply is a 25/30A switcher branded Kenwood KPS-15 although I
suspect they did not make it. I have modified it with 4 APP connectors (it's
ugly but on the back so I can't see it). The cable to the K3 is a #12 cable,
much shorter than the one supplied with the K3 and no fuses or other stuff
inline. The APP connectors are soldered. I guess I am fine, no reason to get
out that deoxit yet and I never mess with anything that works FB. I suspect
the K3 voltmeter reads about 200-300mV high as I read 14.83V out of the
supply with a DVM in receive. But the deltas should be accurate.

AB2TC - Knut


Lee Buller wrote
> 
> This really got me curious.  I was in the NAQP RTTY Contest.....and
> decided to 
> look at the voltage on my K3.  I checked the meter on the RM-35A, but
> those 
> meters are not very good.  The volt meter says 14.5 volts.  NaH!    So, I
> went 
> to the K3 internal meters and got the following
> 
> 100 watts out
> 22.5 amps
> 11 volts
> 
> 13.8 volts key up.....
> 
> 11 volts seems low to me.  So, I might have to do some checking out as
> well.
> 
> Lee
> k0WA
> 
> <snip>
> 


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