Excellent point Roy. Many excellent commercial power supplies (e.g.,
Lambda) typically use remote sensing terminals. The sensing wire conductor
size need only be large enough to ensure that an adequate sample at the load
is sent back to the power supply. The power supply sensing input circuitry
is Hi-Z, so essentially no current flows on the sensing wires. Within
reason, the voltage at the input to the rig is independent of the power
cable length...all supplies should be designed this way and it adds little
to the production cost of the supply.
-Paul, W9AC
----- Original Message -----
From: "Roy Koeppe" <royanjoy@ncn.net>
To: "Ten Tec Reflector" <tentec@contesting.com>
Sent: Wednesday, December 13, 2000 17:28 PM
Subject: [TenTec] Scout on batteries
>
>
> Stated,
>
> "I'm running a 15 amp automotive blade type 32 volt fuse in the power
> cord to my Corsair II. Its close enough to the edge that I can blow it
> occasionally. I figure that's better than being too large and blowing
> finals first. (etc.)..."
>
> All the talk about voltage drop across power cables, fuses and
> connectors reminds me of the excellent design incorporated in my old
> Heathkit 20 amp supply used with the SB-104 transceiver. Its voltage
> regulator sensor wire ran all the way TO THE RIG END of the power cable.
> It could even be run to the RIG SIDE of the power connector on the rig,
> thus compensating for drop across those connector pins, as well as all
> fuses and cable conductors.
>
> Listen up, Ten-Tec designers!
>
> 73, Roy K6XK Iowa Outback
>
>
>
>
> --
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>
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