[Elecraft] K3 Voltage drop
Don Wilhelm
w3fpr at embarqmail.com
Sun Feb 26 10:17:15 EST 2012
Joel,
Measure the voltage drop right at the power supply terminals - that will
tell you how much of that total voltage drop is due to the power
supply. The rest is in the wire and connectors - there are 12
connectors if your PowerPole distribution box has fuses, and 8
connectors if no fuses. The connectors can account for about 0.2 volts
drop at 14.5 amps, and another 0.015 volts drop in the 8 feet of #10
wire (you have to count the length of the return path too. So 0.22
volts of the total drop can be attributed to wire and the connectors.
A 1 volt drop at a 15 amp current draw is not unusual.
73,
Don W3FPR
On 2/26/2012 8:36 AM, Joel Black wrote:
> Ron,
>
> I didn't think to look at that last night, but I am testing it now into
> a dummy load at 50W. I am using an MFJ-4125 with about 18" of #10 "zip
> cord." This goes to a PowerPole DC distribution panel and there is
> another run of about 30" of #10 to the K3. On receive, I have 13.4 -
> 13.5VDC (1.15 - 1.16A). On transmit, it drops to 12.4 - 12.5VDC
> (~14.5A). The wires are not even remotely warm.
>
> I do not have time to test with my Astron RS-35A at the moment, but I
> will when I get home this afternoon. I also have an Astron RS-20A I can
> experiment with.
>
> Joel - W4JBB
>
>
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