Hi all UK stations,
This issue is not going to directly impact activators but it has the potential to shut down the chaser side of the hobby.
A couple of weeks ago I notice that when I transmitted on 5.260MHz a carrier immediatly apeared on the same QRG. The strength was about S1, about 20dB above noise. I completed my QSO with the carrier present, a period later I noted that the carrier had disapered. Transmit again and the carrier appeared again. A bit more investigation showed that this issue was present every 4kHz up the 60 m band and the same thing was present on 80, 40 and 30m. In each case the carriers were spaced 4kHz apart and were heard following a short transmission.
I have now exchange E mails with the RSGB EMC committee, John Rogers M0JAV@RSGB.org.uk. He assures me that these carriers are caused by Super Speed broadband modems. My transmission (less than 1 Watt is all that is needed) de-stabalises the modem and put it into a training mode. I am still assessing my situation, in my case the carriers are exactly on the frequency integers, 7.028, 7.032 10.118MHz etc making these frequencies useless for weak signal working. I understand that last year Ofcom were contacted by the RSGB and a report has been issued. Having read the report, In my opinion it is ineffective, Ofcom seem to be in deniel of the existence of a problem.
If you are aware of new carriers on your bands, with the charactaristics I have described, I recommend you advise John so he can build up a picture of the problem.