Same for auto installs... I see far too many fuses at the radio end of
things... Short in the power wiring, turns into your auto burning
itself down, as that long run of power cable burns up.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 7/21/21 8:35 PM, Don Wilhelm wrote:
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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