What is the minimum recommended voltage for the K3S? Using the stock
Elecraft 5' cable, I drop from 13.3 to 12.7 volts on key down.
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
On 4/16/2018 4:51 PM, Joe Subich, W4TV wrote:
On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
So 4 sets of power pole connectors plus 2 fuses.
Even if the power pole connectors are assembled perfectly and
mated with optimum tension, the resistance in just the four
(15 A) power pole connectors in the negative lead is equivalent
to nearly 40 feet of #12 copper wire!
The voltage at the rig, K3, now drops a volt when putting out 100
Watts.
With the equivalent of 50 feet of power cable (4 connectors plus a
10 foot physical cable), I would not be surprised. Assuming 20A
in transmit (on 15A power poles!), a 1V drop represents 0.05 Ohms
of total circuit losses .... that's pretty good for 10 feet (x2)
of cable plus eight connectors (4 in the + lead, 4 in the - lead)
and the switching device (probably a Schotkey diode). However,
the 0.05 Ohms in the negative lead is probably ten times higher
than in a braided bonding connection directly from the K3 chassis
to the power supply chassis.
I'm surprised that only 75% went through the ground path - that
indicates the ground path has 1/3 as much resistance as the "right"
(V- lead) path.
73,
... Joe, W4TV
On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
About 75% went thru the ground path. The 10 ga to the rig went from
Astron to a battery switching device in case of power outage, to rig
runner and to rig. So 4 sets of power pole connectors plus 2 fuses.
I’m thinking of changing some of that too. The voltage at the rig, K3,
now drops a volt when putting out 100 Watts.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
On Apr 16, 2018, at 3:14 PM, Wes Stewart <wes_n...@triconet.org> wrote:
I would hope that "much of the current..." wasn't really much. The
direct conductor from the negative terminal of the power supply to
the radio should carry the majority of the supply current,
Wes N7WS
On 4/15/2018 7:38 PM, hawley, charles j jr wrote:
This thread prompted me to check out my Astron vs35m. It had a small
black wire from -V connected to the bottom of the chassis. Perhaps
it could be called a case or cabinet...more importantly, it’s what
the green wire from the line cord is connected to. I disconnected
the black wire. When it was connected, much of the current that
would have passed thru the negative power wire from the power supply
to the rig was shunted thru the green power cord wire, the ground
buss bar, and other ground connections.
Chuck Jack
KE9UW
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