08-12-2017, 09:14 AM
I don't know about the shortest, or longest times between a road being resurfaced and it's being dug up again, though with so many services being underground, sometimes the intervals can be quite short. The Gas Mains renewals here in Chippy have been going on since late June, and reportedly will continue for at least another three months. Back to the Radio - I have since found that if it is powered from batteries, there is no interference, so the latter is obviously mains-borne. Probably no cost-effective way of suppressing it, unless a mains plug or adaptor incorporating a built-in RFI filter will help. A now deceased Radio Amateur told me over 40 years ago when I was into SWL-ing, to build a delta filter into the 13Amp plugtop using, IIRC, something like 3 x 0.1uf HV Ceramic Capacitors. In those days neither ready made Filter plugs, not, again, IIRC, Clas X &Y capacitors wrere available, and there was far less interference about, but using a filter plug or adaptor might be worth a try.
