Take the
base station (rack mount or otherwise) and unhook everything. Take it out of the rack (to eliminate something strange in the grounding, I've seen this be the problem). Place it on the bench and grab a few cables that you have checked the pin config on (verify 1-1, 2-2, 3-3 and NO "case"
ground, ie: pin 1 also connected to the case of the
plug). Now connect a
beltpack or two and start testing. Eventually you should find:
A: that you add a cable that causes the problem
B: that you add a
beltpack that causes the problem
C: that you reconnect the "
house" wiring and THAT causes the problem
D: the problem exists with any cable/pack and therefore is in the
base station itself
We had a problem with a ClearCom that existed for at least a year. We sent the
base back twice and finally realized the problem was in the "
house" wiring. We only figured this after taking the
base with us on a
road show and noticing the hum was gone. We tracked it down to one wall
jack having the
ground touching the metal
gang box. This is why I suggested taking the
unit out of the rack (if applicable).
Good luck! Let us know what you find.
Telex is also used extensively in TV work, so you may also want to try a TV board for help. Or, as has been suggested, try
Telex themselves. If they want you as a customer, they will at least try to help you. Otherwise, ClearCom makes a great
system!
Best,
kfox