[amsat-bb] Mobile Computer / Radio Installations
clintbrad4d at earthlink.net
Wed Apr 29 12:35:23 PDT 2009
>> ... Most cigarette lighters circuits have a 15 to 20 amp fuse on
them. That ought to work fine for charging/using with your computer ...
That amount of current can/will destroy sensitive electronic devices.
(20A??? That's more than what an Icom IC-706MKIIG uses at 100W TX
power ... )
Personally, I would never run my laptop off a vehicle's charging
system while the vehicle is running. You won't find many reputable
laptop manufacturers recommending this.
And all power feeds to my radio gear are properly conditioned and
If I needed to run my laptop for extended periods on a 12VDC system, I
would use nothing less than a ...
Tripp Lite PVINT375
(although this model comes with a cigarette lighter plug, that
connection has to be one of the electrically most UNreliable for what
we are doing - so the plug gets whacked off and the unit is wired
directly) ... or
12VDC-to-120VAC inverter made for such circumstances. Wire it in to
your vehicle's 12VDC system, and simply use your existing AC power
supply. Immediate benefit is the ability to power/ charge other
electronic items you may have using regular AC chargers.
There's no need to know the voltage/current/connectors of the laptop.
The laptop's manufacturer already did all that work for you when they
supplied the AC adapter.
Another downfall of using the cig lighter circuit for comms: very
rarely is that line filtered for noise and such. I mean, who needs
that line filtered to heat up a cig lighter? More intelligent cars do
have filtered/conditioned "power ports." But I do not leave anything
to chance, and make sure my equipment is properly protected.
Then there are folks who run their 100W HF rigs through a cig lighter
plug and swear that all's well with the world ...
And so it goes.
Clint Bradford, K6LCS
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