It depends on what your expectations are. And what the concept of "one cable" is. You can send the whole "mix" into one cable and filter it out on the spot with bandpass filters - this works one way. Rx - Tx signals will need extra processing.

Thanks dvmdsc!

Just answering your question, I would really need a two-way communication since one of the signals in question is broadband internet. So, if anybody knows any device which could mix this signals, keeping possible the 2-way communication, it would be great.

Thank you very much!

It is possible, using the cable line adapter and a modem for broadband internet. Cisco will provide also the UHF capable version - probably you will need to amplify to the same level before mixing. The band filters for TV and cable need to be put on one side of a HF splitter, and the modem (linksys- netgear) has a 2 way HF isolator. The carrier will be a coax cable.

Thanks again dvmdsc!

But do you know what device/equipment from Cisco (or any other brand) could do this? If so, could you please send me some homepage link?

Thank you very much!

Why dont you try contacting the ulf -elf group these are abbreviations for ultra low frequency and extremely low frequency signals . they are a yahoo group .Maybe some of them have looked into this in the past ,but its not really their field

DSM

Thanks for the information.

Do you have this group e-mail address?

Regards,

Paulo

What are the exact frequencies ?

you have to be carefull about the main frequencies and the harmonics of thos frequencies interfering with each other

a few links may be of use

• Other Radio Topics Like mixed frequencies, there is another kind of false radio frequencies. These are called HARMONICS. When a transmitter creates an audio or radio frequency ...
  www.angelfire.com/wi/scanner/other.html - Cached - Similar
• Harmonics and Heterodyning of Frequencies These harmonics extend to the radio frequency range and beyond, to infinity, theoretically. Frequencies also exhibit a heterodyning effect. ...
  www.electroherbalism.com/.../FrequenciesandAnecdotes/HarmonicsandHeterodyning.htm - Cached - Similar
• eEngineer -- Radio Frequency Interference (RFI) The following types of interference are applicable to Radio Frequency (RF) ... The modulation envelope must be represented for harmonics as was done for the ...
  www.radioing.com/eengineer/rfi.html - Cached - Similar
• Table 2-1.—Radio Frequency Bands For example: First harmonic (Fundamental frequency) 3000 kHz Second harmonic 6000 kHz Third harmonic 9000 kHz The PERIOD of a radio wave is simply the ...
  www.tpub.com/content/neets/14182/css/14182_67.htm - Cached - Similar
• Influence of radio frequency harmonics to TAMA300 sensitivity by N Nakagawa - 2006 - Cited by 1 - Related articles
  17 Jun 2010 ... Table 1 shows the power of radio frequency harmonics of the LO port. ... radio frequency harmonics exist in odd multiple frequencies. ...
  iopscience.iop.org/1742-6596/32/1/016/pdf/jpconf6_32_016.pdf
• frequency: Definition from Answers.com If an object in harmonic motion has a frequency of 50 Hz, its period is 1/50 of a second ..... At longer wavelengths than IR are microwaves, radio waves, ...
  www.answers.com/topic/frequency - Cached - Similar
• Harmonics - Amateur Radio Wiki 9 Apr 2009 ... An harmonic of a particular frequency (the fundamental frequency f) is ... close to the speed of light for radio waves in the atmosphere. ...
  amateur-radio-wiki.net/index.php?title=Harmonics - Cached - Similar
• Electromagnetic interference - Wikipedia, the free encyclopedia Electromagnetic interference (or EMI, also called radio frequency .... of the signal component (fundamental frequency, harmonic or transient (overshoot

Some more links

http://www.google.co.uk/search?q=multiple+radio+frequecies+down+same+cable&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&rlz=1I7GZEU_en&redir_esc=&ei=V0IrTOeBFpKhsQbe9bXFBA

http://www.google.co.uk/search?q=how+many+signals+can+be+sent+down+one+cable&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&rlz=1I7GZEU_en&redir_esc=&ei=BUMrTJWSGofbsAb3nZjEBA

Already in part been addressed but to add power levels, the OP needs to provide all frequency and bandwidths as (he) knows it. Knowing those parameters, one could do an Intermodulation (IM) and likelihood of occurance; additionally.the degree of isolation required as harmonics interference is of concern..

So that brings us to combiner/splitters for each termination of the cable. I wouldn't be inclinded to research for a catalog item. Otherwise to be very expensive. Unless it's within the confines of already availble for cable TV (referred to earlier by other).

In any event, insertion loss is of concern.

Not yet mentioned is the delay in the satellite transmission which may compromise your chances of success.

The internet broadband signal may not be via satellite, so only the TV signal (which is broadcast) would traffic via sat (in this case, the delay is not a problem). The internet signal could be an ADSL or cable internet to be inserted on the RF coaxial cable.

I found an equipment which maybe can satisfy this issue. I apologize but its folder and manual are in Portuguese language, but anyway if it interests, they follow below:

Manual:

http://www.cianet.ind.br/pt/manuais/hpna3/manual%20cts3500ec.pdf

Folder:

http://www.cianet.ind.br/pt/folders/hpna3/folder_cts3500ec.pdf

Does anybody have already heard about any other kind of these equipments? If so, please let me know.

My doubt now is that if I need an ADSL modem to convert the ADSL to Ethernet (input of the equipment) how would it be the validation of the ADSL subscriber in the network if I have more than one subscriber in the building (for example)? I mean, in theory, I would need one modem to each subscriber, as this kind of validation is based on modem MAC Address, right?

Thank you guys for the attention and all information provided.

We call them interfaces and you can find them in studio's for example and live broadcasting rigs.