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Is it possible that my neighbors ham radio is screwing up my cable?
For the last few weeks, my Comcast digital cable & internet has had off & on interference. Initially the pattern seemed to coincide with roadwork near my house, between 8-5 so I thought if was from the workmen's radio frequencies since Comcast came out & checked & couldn't find anything...the pattern has changed where this can happen anytime now including nights when the road workers are gone. We also noticed that someone has put up a large ham radio tower in our neighborhood around the same time, so I'm starting to think this might be the reason. Is this possible?
Digital cable channels typically are allocated above 552 MHz.
http://en.wikipedia.org/wiki/Digital_cable
Most ham radios transmissions for home (base stations) are under 30 MHz, alhough there are VHF and UHF but these operate at much lower power:
http://en.wikipedia.org/wiki/Amateur_radio_frequency_allocations
Since digital cable is mostly Optical Fiber To The Curb (FTTC) which is immune from RF:
http://en.wikipedia.org/wiki/FTTC
The most likely suspect is the cabling between the optical to RF converter box cabling to your home.
An improper, poor, or no grounding stake at you home is also a key suspect of problems.
Finally if the lighning suppression could have been compromised allowing RF to be induced (from anywhere).
Since you are paying for this service, the best advice is to have the cable company come out and diagnosis the problem for you. They will need to check the signal losses of all the cabling and the box itself for possible damage.
The cabling and boxes are designed to reject ALL RF noise, IF functioning and installed properly.
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