> Sharing a single power supply between the transmitter and > accessories is a very good way to create "RFI" (even with > a dummy load) due to the "pin 1" problem in nearly every > amateur rig ever built.
I completely agree with Joe, but I'm guilty of using a common supply for the K3 and switching-type accessories. However, if a common supply is used with a distribution block, consider connecting the K3 direct to the power supply terminals and not a port on the distribution block. Then, if a power distribution block is used, route accessories from the power supply terminals to the block, especially if one is insistent on running audio accessories from the +12V bus. The W2IHY products can be powered by +12V and seem to be very popular. When using a W2IHY device, it would be better to use the supplied wall-wart than be tempted to use a common +12V power bus. If I was designing a similar device, I would rather design it for use with an AC wall transformer (AC in/out), then rectify and filter inside the audio device. The added benefit is that bi-polar supply rails can be easily created with an AC input. 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
