Dave and all,
Placing the fuse near the power supply end is the way to do it.
In the event of a short, the power wire can spew metal and start a fire.
Always fuse near the power supply. A fuse at the equipment end will
only protect the equipment, but will expose the wire from the power
supply to hazards.
73,
Don W3FPR
On 7/21/2021 10:43 PM, Dave wrote:
Hi,
I am unsure what you are asking... If you are asking about fuse
values, I select values a bit above the max peak current I expect.
For my K3 I use a 30 amp fuse.
If you are asking about voltage drop, and want to know what the K3
sees, there is a built in volt meter in the K3, (see the manual),
which will show you the voltage at the K3, after all your fusing, and
wiring.
I always take my voltage readings at full output. I try and stay
within the limits Elecraft sets for voltage. If I am running low
voltage on transmit, I goose the power supply slightly, staying below
the max voltage rating Elecraft recommends when not transmitting at
full power.
The fuse(s) is/are probably not going to protect my radio-- if
something happens, (i.e., current draw in excess of 30 amps), the
radio is probably already broken.
I use the fuse to reduce runaway thermal effects, (read that as fire),
on my power supply wiring in the event of a short to ground. I place
the fuse(s) as close to the power supply as my wiring will allow.
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