denny / k8do
________________________________
Hsu, I have an SGC500 that I have used in the boat/truck/shack... I have
learned a few things...
First, is that you need a good battery set, at least a pair of group 27 or 31
to handle the surges...
Marine batteries preferred for this type of duty...
And you need a big charger to keep the batteries from discharging too far
during heavy operating periods...
My truck has 2 alternators of 125 amps each...
I use a bank of Golf Cart batteries in series/parallel in the boat with a
single 90 amp alternator...
You will be pulling over 100 amperes at peaks... This is a big electromagnetic
field...
When I use the SGC500 in the shack, it sets on a shelf at eye level... The DC
cables drop straight down from the front of the map to the battery set on a low
shelf, so there is a good 3 feet of cable hanging and they are about an inch
and a half apart... When I am keying CW the cables will start to swing towards
each other and away in rhythm to the keying of words - Orsted's Right Hand
Rule and Flemings Left Hand Rule demonstrated visibly... Visitors to the shack
find it fascinating...
On your Golf, you are sucking the battery down to the point that the voltage on
the system is below the cutoff for the CPU... It also means the voltage to the
amp is down which is bad news for the transistors... I suggest you add a
battery in the trunk..
On building an amp... Take the cover off your SGC500 and look at the attention
to detail for heat sinking, relays, bypassing, etc. to see what you need to
have a reliable amp...
cheers
denny-o
k8do
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