[time-nuts] TBolt vs Twisted pairs

2012-07-20 Thread Hal Murray
(From a month ago.) albertson.ch...@gmail.com said: Take my word for it, the T-Bolt is not able to drive a 100 foot long twisted pair cable I don't think that's quite the right way to phrase it. What type of twisted pair were you using and/or what sort of setup did you try? How well did

Re: [time-nuts] TBolt vs Twisted pairs

2012-07-20 Thread Magnus Danielson
On 07/21/2012 01:31 AM, Hal Murray wrote: (From a month ago.) albertson.ch...@gmail.com said: Take my word for it, the T-Bolt is not able to drive a 100 foot long twisted pair cable I don't think that's quite the right way to phrase it. What type of twisted pair were you using and/or what

Re: [time-nuts] TBolt vs Twisted pairs

2012-07-20 Thread Didier Juges
The Thunderbolt has no problem driving a 100 feet 50 ohm coax cable, aside from the obvious impedance matching problem (the TB has maybe 5 ohms output impedance), so I am not sure in what context that remark would apply. Didier KO4BB Hal Murray hmur...@megapathdsl.net wrote: (From a

Re: [time-nuts] TBolt vs Twisted pairs

2012-07-20 Thread Chris Albertson
Yes, of corse twisted pairs can handle fast signals. Gigabit Ethernet over cat-5 cable is a good example. What I meant when I wrote the below is that a bare t-bolt PPS output can't drive 100 feet of cat-5 cable when the far end is connected to to typical 74LSxxx t/l chip. The pulse get smeared.

Re: [time-nuts] TBolt vs Twisted pairs

2012-07-20 Thread Didier Juges
I don't think the problem is with the tbolt, see http://ko4bb.com/Test_Equipment/CoaxCableMatching.php There is a picture of the tbolt driving 50 feet of average quality 75 ohm cable. With the right termination, and if the cable is good enough, there should be no problem. If the cable is