> I may be wrong but I beleive your theory doesn't assume that the RF > energy at your reciever's antenna is not additive. In other words, > the signal from the transmitter you want to hear and the interfering > signal do not add together. You can only discern the strongest > signal. An example is, that if you put a carrier on the air and I > receive it at S9 and then someone else puts a carrier on the exact > same frequency but it only arrives at S8, I'll never know it is there. > > Therefore, when you remove the interfering signal, you also remove any > possibility of retreiving information from the signal you want to > hear. Consequently, you will never have a coherent signal to decode. > It will always have missing information. > > Any other assumption means noise, especially random noise, would not > be a problem, and that you could always subtract a signal from it. > Every mode I know of, digital or analog, has a minimum signal to noise > ratio that is required to decode it. > > Jim > WA0LYK
SSB is carrier suppressed and CW is all carrier. In either case several stations may transmit on the same frequency and I can hear at least pieces of many of them. What you are describing sounds like FM capture effect, I am not certain that it applies to other modes. Digital modes have steadily improved in the capacity to extract data packets from further and further down into the noise floor. In my construct we are dealing with a situation where it is possible to receive a signal in the absence of the BPL QRM/QRN so the non-BPL exacerbated SNR would be at a reasonable level absent the BPL. Since BPL-generated QRM-QRN is somewhat predictable it would seem reasonable to postulate that it may be removed or mitigated via a variety of methods. This is not to say that I believe BPL is anything other than a dumb idea, financially or technologically. It is bad for stockholders, bad for emergency communications, and bad for Hams and SWL's. That said, the level of power line, cable line, private resident, and business QRM/QRN her north of Florida is horrific. It renders the AM-broadcast band nearly unusable in places -- in direct violation of law and regs. Enforcement action is unlikely. One wonders if the hidden agenda of BPL and ignoring other QRM/QRN is to drive Hams off significant segments of spectrum in order to make it available to commercial interests. -- Thanks! & 73, doc, KD4E ... somewhere in FL URL: bibleseven (dot) com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
