Transmit/receive cables are run in bundles all the time without a problem. If you are having problems, the it is probably due to poor shielding or poor grounding or both. There could be a breach in one or more of the cables that is(are) allowing power to leak out.
You didn't mention the power levels through the cables. Are you experiencing cross-talk between the cables? Is the problem that TX power is leaking into the RX cables, or between TX cables? How long is the cable run? What kind of cable is being used?
Some easy checks would be:
* Inspect all the connectors in the system for damage, filth, or not being seated properly. Bad connections can be a major source of problems.
* Visually inspect the cable for damage or a bend radius smaller than the manufacturer's recommend. Reflections in a cable cane cause all kinds of wierd phenomena.
* If physical properties are OK, then do as you mentioned and try separating the cables by some distance. Maybe only one cable is causing problems.
* Anyone else have other suggestion?
- Kirt Blattenberger