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Pilot post - sdi signal


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#1 Sam Morgan Moore

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Posted 20 June 2015 - 07:30 AM

Hi.

 

Im trying to feed SDI down my Pilot post into a Decimator I have rigged at the bottom..

 

GH4-YAG-SDI-Post-Decimator-Monitor.

 

This setup was working!

 

It stopped working and I had to changed the 'tail' out of the bottom of the pilot post and assumed I had made a dodgy connection - but that does not seem to be the cause.

 

Simply if I connect a 9V duracell to the top of the post monitor in and a volt meter to the post monitor out connector I get 9v.

 

The thing passes volts, but not signal!

 

So is there a situation (bad earth etc) where I could..

 

-Pass volts down the post monitor wire but NOT pass an SDI signal down it?

 

Thanks

 

S


Edited by Sam Morgan Moore, 20 June 2015 - 07:32 AM.

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#2 John Brankin

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Posted 20 June 2015 - 08:41 AM

The sled is most likely wired with a 50 ohm cable.  It needs to be 75 ohm to carry the HDSDI signal properly.  


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#3 Sam Morgan Moore

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Posted 20 June 2015 - 09:07 AM

Thank you - that makes sense...(Or doubtless wouldif I understood electricity) but it did work for a bit!

 

The cable is tiny - would fatter cable work?

 

My feeling is that Im just going to try and stuff a functioning SDI lead down the post - no soldering for me if at all possible.

 

Due to the mass of my rig (fully loaded) I don't have many configurations that actually fly anyway - so a 'tail' out of the bottom of the rig should give me enough configuration options.

 

S


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#4 Jess Haas SOC

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Posted 20 June 2015 - 10:02 AM

Non HD-SDI rated cable will often work for short runs but since it is a marginal signal to begin with as the cable and connections degrade it gets flaky or stops working all together. Your best bet for a thin cable is probably Beldin 179DT. Where are you located?I have the crimp tool. If your in LA and want to swing by I could help you out for a reasonable price.
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#5 Sam Morgan Moore

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Posted 20 June 2015 - 10:19 AM

HI 

 

Im in the UK - have managed to stuff a normal SDI lead down, (actually much neater at the top!) - just need to get the bottom connector in place and hopefully Im in business.

 

Thank you

 

Sam MM


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