K9YC: >"Joe is right and George is WRONG. V- is NOT GROUND, it is the return for DC power. Bonding V- to ground is a BAD idea -- that's why virtually all pro-grade power supplies are built either without the bond or so that the bond can easily be removed."
And from K2VCO: >"But I keep coming back to this: almost every device connected to the power supply has V- connected to ground internally. So if you have, say, a keyer and a transceiver running off the same supply, won't some of the transceiver's current flow through the V- line to the keyer, to the case of the keyer via the internal connection, to the station bonding, to the transceiver case and thence to the transceiver V- input?" Just my 2-cents, but both statements are correct, depending on the context. Let's compare figures 3 & 4 in K9YC's link: http://k9yc.com/PowerSupplyBondingAndAudioDistortion.pdf The transceiver's return lead current is controlled in figure 4, but only if 12V accessories are not connected to the power supply. The moment we do, we essentially create the condition shown in figure 3 -- and to K2VCO's point, the supply's V(-) lead and chassis will come together by virtue of the accessory equipment and the ground lead of the supply's AC power cord. Complete control of the transceiver's return current is then lost and we must rely on much heavier gauge wire to ensure the return lead current does not split into accessory equipment. I now run one transceiver to one 12V PS. One rig, one supply. Accessories are connected to a separate supply and feed a RigRunner DC power manifold. Accessory current through the RigRunner is low and no external audio gear is powered from it. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
