I have the resistance chart for various wire size but find that the
voltage drop is usually more than ohms law predicts so I go up one
size just for insurance.
I included 4-foot No.10 Red/Black zip wire (from Powerwerx) with each
of my 2M80 amplifiers which typically draw 15 amps key-down CW at 80w
RF output. Ohms law predicts .00098*2*4*15 = 0.12 volt drop, but
generally saw about 0.3v drop (but I had another 6-foot of No. 10
from the PS to workshop power strip).
I'm wiring my new truck with No.8 awg from battery to distribution
strip in back seat of the crew cab. Guessing the run will be at
least 16-foot. Theory says .00063*2*16*30 = 0.6 volt drop at
30A. Battery runs at 14.2 with engine running so that should get me
13.6v. Engine off 13.8v will net 13.2 volts which will lower
amplifier gain a little. Largest amp draws 25A for 160w output on
2m. I have other equipment connected but only one will be in use at any time.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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