Hello John,
Tuesday, October 13, 2015
I have no direct RF ground on the rig, as my shack is upstairs and I
found on HF the long ground lead was radiating. I found much better
results without a separate RF ground to the rig, so unsure whether I
should add it back on for HF. It only tripped when on high power, but I
am fairly sure the repair I did to the mains toroidal could be to
blame. I managed to drill into the primary winding when adding rubber
feet to the cabinet when I should really have called it a night and
gone to bed! I repaired the winding with care, using a new single turn
well insulated and protected with Kaptan tape as well, but I do have a
new replacement for it, so, as it also seems to run hot, I will renew
and add some air spacing. Further comments on an isolated ground very
welcome, thanks.
> Chris,
> Make sure that your radio earth and your mains supply earth are
> properly isolated from one another, preferably with a double wound
> RF transformer. Until I did this, I found that the RCD equivalent
> would trip within an hour when I was soak testing a 30W transmitter
> on 136 kHz (losing domestic supply was guaranteed to degrade domestic
> tranquillity!).
> 73 John F5VLF
--
Best regards,
Chris mailto:[email protected]
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