a60
I will make the 8100 Class DART my new A Stock.
Posts: 743
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Post by a60 on Dec 31, 2010 18:40:32 GMT
I was on 6158 today and I found it was making a noise like the fans you would find on the DMs. What's causing this and, why?
Also I found this on 6051 earlier this year.
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Deleted
Deleted Member
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Post by Deleted on Dec 31, 2010 19:12:24 GMT
What do you mean by fans? The compressors or the high pitched noise that can be heard on all stock till the 92 stock?
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a60
I will make the 8100 Class DART my new A Stock.
Posts: 743
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Post by a60 on Dec 31, 2010 19:15:41 GMT
It's like that high-pitched noise but, it seems to be coming from the speakers or somewhere like that
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Post by redsetter on Dec 31, 2010 23:12:22 GMT
there was a whoring noise coming from the pa speakers last time i was on the a60 stock.
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Post by phillw48 on Dec 31, 2010 23:19:35 GMT
Perhaps its something in the cab and the drivers left the PA mike on?
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a60
I will make the 8100 Class DART my new A Stock.
Posts: 743
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Post by a60 on Dec 31, 2010 23:29:56 GMT
I heard the driver make an announcement and hang up again, unless there's some problem with the thing upon which the PA thing rests.
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Deleted
Deleted Member
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Post by Deleted on Jan 1, 2011 0:24:32 GMT
there was a whoring noise coming from the pa speakers last time i was on the a60 stock. Possibly a problem with the hookers in the driving cab? |
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Post by t697 on Jan 1, 2011 11:18:31 GMT
'A' stock is susceptible to the MA 850Hz frequency getting on to the PA wires particularly in damp weather, probably via electrical leakage at autocouplers. It sometimes seems to help by putting the PA handset back on the hook switch. That's hook, not hooker!
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Post by deadmans on Jan 1, 2011 13:16:36 GMT
It's like that high-pitched noise but, it seems to be coming from the speakers or somewhere like that The speaker feedback has been a issue before, it can be quite loud at times. |
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Deleted
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Post by Deleted on Jan 1, 2011 19:06:22 GMT
Couldn't resist - Sydneynick - too funny!  ;D ;D |
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Deleted
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Post by Deleted on Jan 1, 2011 19:57:23 GMT
Either the speakers have gone or the PA handsets off the hook
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Deleted
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Post by Deleted on Jan 1, 2011 20:05:22 GMT
MA whine was the first thing that came to my head when I saw this but I thought I'd keep quiet. t697's explanation seems rather reasonable; it only takes a small current (even induced) on the speaker wires to begin producing noise.
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a60
I will make the 8100 Class DART my new A Stock.
Posts: 743
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Post by a60 on Jan 11, 2011 21:00:52 GMT
Interesting, thanks all for sharing info  |
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;D ;D
