I have a Heil Clearspeech speaker and it specifically recommends a
separate power supply for the speaker, do not run off the same supply as
the rig.
I didn't see the reason for that, so I hooked the speaker up to the same
supply I used for the K2. It sounded pretty good a low volume, but when
I cranked up the K2, I heard feedback. Figured it was time to listen to
the manual and hooked up a separate 12vdc supply to the speaker, and
sure enough, plenty of volume and no feedback.
I didn't notice an issue with grounding.
I realize this doesn't specifically answer your question, but I think
you're on the right track using a separate supply.
73
Larry
WA2DGD
David Fleming wrote:
I have a significant feedback problem with my K2/KPA100. When
transmitting there feedback (sounds as clear and as loud as a PA system)
through an attached external speaker. The only partial solution I have
found is to use a sea rate power supply for the K2 and NOT connect the
power supply to ground. This makes a noticeable reduction in the
feedback. However, as soon as I attach the power supply to ground the
feedback returns. It seems there should be a solution other than not
connecting the power supply to ground. Suggestions and help will be
gratefully appreciated.
Dave Fleming KB3HCL
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