Alan,
There's a wire table in the back of the ARRL Handbook, and also on-line,
where you can find the right gauge wire to get the voltage drop down to
where you want it. You can just cut off the present cable near the
connector, and solder-and-tape splice on the new heavier gauge wire. I
rarely use remote sensing because it can lead to over-voltage conditions
if you break a sense wire and sometimes instability in the power supply too.
George, PJ5/KJ6VW
On 02-Jan-11 8:55, Alan NV8A wrote:
On 01/01/11 05:38 pm, Ralph W5JGV wrote:
I have just noticed that although a DVM across the power supply
terminals still shows 13.7 - 13.8 volts when I do key-down into a dummy
load, Ctrl-Shift-I in PowerSDR shows the voltage dropping as low as
12.6. Is this OK?
Check the power at the pins of the connector on the back of the radio.
That's the only way to be sure of what you have.
13.77V at the radio on receive. Drops to 12.9V (same is displayed by
Ctrl-Shift-I) when pulling 20A. Someone else told me that he cranks
his p/s up to 14.1V to compensate for the drop, but I'd have to
perform surgery (change a resistor, as the pot is already at max.) on
my p/s to get any higher voltage out of it.
That seems a large voltage drop when I look at the resistance tables
for Cu wire.
What I really need, I guess, is a new power cable and perhaps even
remote sensing circuitry added to the p/s to maintain the voltage at
the rig's power terminals.
73
Alan NV8A
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