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| Thread ID: 23021 | 2002-08-05 11:18:00 | Ground Noise Levels | Sam H (525) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 68399 | 2002-08-05 11:18:00 | What would be a good average ground noise level? Telecom said I had a level of 58 which was normal. |
Sam H (525) | ||
| 68400 | 2002-08-05 11:23:00 | > What would be a good average ground noise level? > > Telecom said I had a level of 58 which was normal. > you might want to qualify what you mean...the ground here is very quiet, it has only a few earthworms stirring. do you mean background noise on a phone line? and are you talking dB, and is that dB log10 or just dB?? |
godfather (25) | ||
| 68401 | 2002-08-05 11:29:00 | Well if you are winding up the stereo - the maximum permitted noise at your boundary is something in the region of 40dBA . The exact figure - so I'm told - is in the Resource Management Act somewhere . I don't think it specifies whether you have to be lying on the ground or half way up a ladder at the boundary though . . . . |
Heather P (163) | ||
| 68402 | 2002-08-05 11:32:00 | remind me never to live nextdoor to you Heather...... | godfather (25) | ||
| 68403 | 2002-08-05 11:37:00 | Well, when I was Auckland Tech for a firm hiring out jukeboxes.... never had the neighbours complain. Mind you, I never actually took a jukebox half way up a ladder on the boundary.... | Heather P (163) | ||
| 68404 | 2002-08-05 12:51:00 | Ground noise 0 to 40dB ok 40 to 65 marginal 65 + noisy |
resol (1356) | ||
| 68405 | 2002-08-05 13:12:00 | 58 dB is ok if you have a "good" modem , a good modem will ignore noise, are you having internet problems. | resol (1356) | ||
| 68406 | 2002-08-06 03:53:00 | ?:| All wrong. :-( What Telecom mean is "dBm". They didn't come to your place with a sound level meter. They put a meter on your telephone line. dBm dB relative to 1 mW in 600 ohm. It will be actually -58 dB. (because you certainly haven't got 770kV rms on your telephone line). 1mW in 600 ohms is 0.77 Vrms. -58dBm is (close enough to) -60dBm. That is, one millionth of 0.77 V rms of "noise" on your telephone line. The maximum power allowed from your modem is -6dBm (or -10? --- it's a while since I've looked at the figures). That's about 0.33 Vrms. You have a pretty good signal/noise ratio. ;-) |
Graham L (2) | ||
| 68407 | 2002-08-06 04:28:00 | Thanks Graham and all the rest. | Sam H (525) | ||
| 68408 | 2002-08-06 05:24:00 | OMG Graham! :O Did you sit there and quote all that from the top of your head, as usual??! |
Susan B (19) | ||
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