Of course there are car "battery terminal" switches which can handle
100+ amps. They are not expensive. They have insignificant voltage
drop. They draw zero current on or off.
It used to be that having a master power switch for a station was
considered a necessity.
Low voltage stuff these days has somewhat bent that rule. It still
seems like a good idea.
73 de Brian/K3KO
On 10/19/2013 7:11 AM, Jim Brown wrote:
Dave,
The reason this matters is that because Wayne comes from the world of
QRP and backpacking, he has always worked very hard to minimize the
current drain on a battery that you have lugged up a mountain (or
charged from solar panels at home). That's one benefit of owning an
Elecraft radio.
I have my SO2R station powered from batteries that are solar charged,
with the addition of an AC charger for contest weekends. All that
wiring is behind an operating desk that is attached to the wall.
"Pulling the plug" on the radios sounds simple, but it means adding a
switch to the DC power line of each radio, in which a design parameter
is to minimize the voltage drop with a 20A load. That means a beefy
relay in series with each radio, and a switch to control it. Now that
I know it's a 4mA drain, I probably won't bother. with 40 mA per
radio, I would. :) And the relay probably draws 50-100 mA when the
radios are on.
73, Jim K9YC
On 10/19/2013 4:40 AM, Ken Wagner K3IU wrote:
G'morning, Dave:
My purpose in the posting below was to correct an error I had made
earlier.
You are probably not missing anything, but IMHO this subject is far
more germane to the purpose of this reflector than many postings
which result in extraordinarily long lives here.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 10/19/203 7:22 AM, Dave Wright wrote:
Maybe I'm missing something here, and I'm not trying to be a jerk,
but we're talking about 40ma. Most electronic devices these days
don't use a "hard" power down, but rather a "soft" power-off state
in order to maintain settings/calibration, allow for rapid
startup/remote control usage, etc.
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