|
|
| Re: Canarsie CBTC (99378) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: Canarsie CBTC |
|
|
Posted by tracksionmotor on Wed Jun 15 22:47:28 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Thu Jun 9 22:07:43 2005. LIRR runs ATO...I've been modifying the 'antenna shields' because they have been falling off. Say you have five hundred miles ofstraight track...how many inductive transponders do you need if trains run fiftey mph pace? How many times must signals interrogate the trainset? NJT has no trips but batch of T/Os got caught running red lights. Point is system needs a limited number of comms...T/O can be tweaked for response at any time period by MCC without comm into system. Yes, conventional RR block system modified for comm. CBTC cannot have dead spots, period. I know RF systems from DC to light. CBTC inductive pickup at say every 200 feet will work perfectly...trainset is roughly 500 feet long. Don't talk RF propagation to me...the 'sticker box RF comm system' that NYCTA will use is like the cheapo RF TV remotes....and subject under law to any and ALL interference as an unlicensed part 15 user. That's right...NYCTA will use an unlicensed Part 15 system on ungaurded frequencies. Say I key up on 440 mHz FM with five watts and second harmonic of ELP level coincides with trainset comm links. Something happens, trainset comm system huntsa for another frequency (IF system works that way) with dead comm BIE trainset. Whos fault is it? NYCTA, trainset manufacturer, vendor or me? On any frequency at any time of any mode of any power level, I am the primary user as licensed by the FCC as a commercial radio operator. TA/trainsets...just cheap CB. Think. CI peter |
|
|
|