Re: LOCKING TERMINATORS CREATING INGRESS IN RETURN
Member #: 7190
Registered: 1996-2001
Posted:
483
Name:
Greg Tobin
Name:
Greg Tobin
Company:
Interactive Broadband Technical Services
Occupation:
HFC Engineer/Consultant
Location:
www.interactive-broadband.com
Personal:
Experience:
~45 years
If the 75-ohm terminator being used is a GOOD 75-ohm terminator...this would yield a true response. Keep in mind that if you are looking off a tap with multiple outputs, ALL outputs MUST have a 75-ohm load or terminator. If ANY ports are left "open" or "unterminated"...this could cause a "ripple", "standing wave", "reflection", "spikes" or whatever term you would like to use. If for some reason you have all ports terminated on tap (and confirm a true 75-ohm thru output) and still see a reflection...this could be due to either a bad tap or a bad initial reverse reference. Another thing to be aware of is the terminating/non-terminating of SPECIFIC tap values. A higher tap value will will have higher isolation and a terminator may have no or little effect, but, in lower values (4, 8, 11 respectivly), espically the infamous "self-terminating tap", a 75-ohm terminator is recommended for proper system termination and lessen the reflections that may be seen. In any event, a loose terminator (stinger type) is worse than no terminator at a tap port. And as mentioned before, a poor or unstable initial reverse reference will plague you through the entire system...and will make a good 75-ohm termination look as if it is bad. In reference to "CHAD", depending on what type Philips amplifier you have, and where you referenced to, this could also have the similar effect. One more point...not to be a long winded "old fart" (lol), if you reference into a link that has noise or ingress, this could also distort your initial reference not to mention "clip" the return laser and cause you "Excederin Headache Number 23,496". Good luck!
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