|jql||any advice on what headset to get (or not) for a polycom 501?|
|ManxPower||I never thought I'd say this, but I'm starting to hate analog lines|
I have a 500hz - 650Hz hum (it fluctuates)
do you have the signal some kind of scope ?
|ManxPower||Yes, a Sage Instruments 930A (it is a test set for phone lines)|
|ManxPower||The hum is at about -49db|
|ManxPower||Bought it for like $50 off of ebay|
aptura: yes but users are still complaining
I need to test it at the demarc and see if I still have it.
We are 11 miles from the CO, but about 2 - 3 miles from this site is a SLIC96 between us and the CO
|aptura||I have taken a couple years of electronics and cannot think of what discreet electronic componets would produce 500 hz unless it is a multiple of the fundemental frequency. Harmonics! :)|
|ManxPower||I suspect it is a harmonic of 60Hz|
|aptura||It could be some harmonics not being filtered out.|
If there are electrolitic capacitors in the circuit thay could be getting dry and not working right but would not know what else it could be. Perhaps poor shielding from a harmonic source.
Actually it could not be electrolytic it would be disk capacitor.
|ManxPower||Bell corrected a "ground fault" on one of the lines.|
|[TK]D-Fender||jql, Plantronics M12 amplifier & H261 binaural polaris headset|
|aptura||tiny disk capacitors are used between ground and branches in circuits mostly.|
so what was the result?
I once worked at Fluke some of there network/telco test gear was in the sub 15-20k rang for the upper end hand sets.
|ManxPower||well that was fun.|
the result was no hum when I listened to the line, but that was on a butt set, not a real phone
I get the same hum, but at about -62db at the demarc
|aptura||butt set is one of those orange test phones?|
|ManxPower||on the 2nd line I get a 120hz - 190hz at -59db|
|aptura||anything at 180?|
120 I can understand but 190?
Manx looks like something I used 15 years ago but for Avionics.
The sage is not something you normally lug around
|ManxPower||no it isn't|
on hook it is around 80hz at -50db or so