Ron, as a semi direct answer to your question, as a general rule cable tv frequencies typically are well above hf radio. It is not impossible for there to be interference, but generally it will be some other source. One thing to remember with most cable systems is that the line and trunk amps need to be powered and are usualy done through the cable itself with pole mounted power supplies every so often in the system. If there is a connection breakdown somewhere near you, it"could" cause your symptoms. You did provide a clue to your own situation. You mentioned a bucket truck in the area when the noise suddenly stopped and then started again. If he was working at a particular pole, you might try physically walking to that pole and see if you hear any arcing, especially if this is also a power pole carrying primary voltages. It is not uncommon for the insulators to start breaking down due to dirt and grime in the air getting on the insulators and forming a path for the current to travel. This manifests itself frequently as strong intermittant static. Your noise blanker typically only works on "impulse" noise such as ignition, etc. Have you also eliminated all noise sources in your own home, such as televisions, computers and monitors, etc.? A great way to chase the source is to take a small portable shortwave receiver with a small antenna and follow the noise to it's source. You can usually get very close very quickly with a little leg work. Just some thoughts .... Best of Luck
--- In digitalradio@yahoogroups.com, w4lde <[EMAIL PROTECTED]> wrote: > > If this question is inappropriate for the reflector I apologize but as > of last Friday I started to experience significant noise (S-9) on all > bands from 160 through 15M with the lower frequencies much stronger. I > thought that it was due to power line noise but it appears to be > intermittent in that it completely disappeared last Friday evening but > once again showed up last Saturday and stayed this way. On the Ft1000mp > the noise blankers are completely ineffective. At the same time I > started having internet problems and the cable company indicated they > should have the speed issue fixed by Tuesday. > > The cables are run on poles until they enter a subdivision which then > run underground. My question is can cable lines be the possible problem > to HF frequencies? The power and cable companies have been installing > new poles and running new lines in the area which initially led me to > believe it was a power issue however, while I was writing this email the > noise completely disappeared for a few seconds and then reappeared. As > I was looking out my window I noticed a cable company buck truck > through the woods towards the main road, I am off now to talk to them > and see what I can discover. Any suggestions? > > Thanks for the bandwidth if this question is inappropriate for this > reflector. > > 73 de > Ron W4LDE >
