Is there any issue with having 2 clearcom power supplies on the same partyline and powered on?
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Sent from my iPhone
2 clearcom power supplies on the same partyline
- Thread starter Andrew Broughton
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Re: 2 clearcom power supplies on the same partyline
Only one of them can provide line termination, there's a switch on the back of most ClearCom base units...
Only one of them can provide line termination, there's a switch on the back of most ClearCom base units...
Re: 2 clearcom power supplies on the same partyline
Right, but the power supply is protected from other power supplies on the line?
Right, but the power supply is protected from other power supplies on the line?
Re: 2 clearcom power supplies on the same partyline
Ehhh...not so much. I had a ClearCom power supply fried when a touring show plugged their system into mine without telling me. I guess they maybe didn't have that line termination switched engaged.
But, if you need to extend the system, I would use one of the remote base stations which they make for that purpose.
Ehhh...not so much. I had a ClearCom power supply fried when a touring show plugged their system into mine without telling me. I guess they maybe didn't have that line termination switched engaged.
But, if you need to extend the system, I would use one of the remote base stations which they make for that purpose.
Re: 2 clearcom power supplies on the same partyline
I didn't see this before, but from the PS-702 brochure:
I didn't see this before, but from the PS-702 brochure:
Re: 2 clearcom power supplies on the same partyline
Apart from line termination, you also risk to make a ground loop.
Re: 2 clearcom power supplies on the same partyline
This. I have never come across a comm psu that didn't have a hefty diode in series with the output making reverse voltage a moot point. I have on the other hand had ground differential voltage take out fuses including killing the fuse in sealed yline lump power supplies ensuring that the solution for the five cent fuse was a $50 replacement brick.
This. I have never come across a comm psu that didn't have a hefty diode in series with the output making reverse voltage a moot point. I have on the other hand had ground differential voltage take out fuses including killing the fuse in sealed yline lump power supplies ensuring that the solution for the five cent fuse was a $50 replacement brick.
Re: 2 clearcom power supplies on the same partyline
Definitely. If the power supplies aren't close to each other you'll likely have ground loop hum. A com isolator is a useful bit of kit to carry. I rolled my own with some pointers from Peter Erskine's website but there are some commercial units around too.
http://www.bestaudio.com/downloads/
Definitely. If the power supplies aren't close to each other you'll likely have ground loop hum. A com isolator is a useful bit of kit to carry. I rolled my own with some pointers from Peter Erskine's website but there are some commercial units around too.
http://www.bestaudio.com/downloads/
Re: 2 clearcom power supplies on the same partyline
I'm looking for redundancy, not isolation. Lifting Pin 1 (in case of ground loops) and checking termination should be all I need to do, correct?
I'm looking for redundancy, not isolation. Lifting Pin 1 (in case of ground loops) and checking termination should be all I need to do, correct?
Re: 2 clearcom power supplies on the same partyline
If you lift Pin 1 on a comms line, you'll lose power and audio, since the audio is unbalanced, and the power sits between pins 1 and 3...
If you lift Pin 1 on a comms line, you'll lose power and audio, since the audio is unbalanced, and the power sits between pins 1 and 3...
Re: 2 clearcom power supplies on the same partyline
As Chris says, power and audio are on pin one. Keep the power supplies next to each, parallel them together and you should be fine. I do this regularly with ASL gear.
If you're looking for redundancy are using a UPS?
As Chris says, power and audio are on pin one. Keep the power supplies next to each, parallel them together and you should be fine. I do this regularly with ASL gear.
If you're looking for redundancy are using a UPS?
Re: 2 clearcom power supplies on the same partyline
If you're only concerned about redundancy then you can put both power supplies in the same location, and there won't be a risk of a ground loop.
However, if you have them both paralleled and one drops out how will you know that you've lost redundancy?
you might be better off with an A/B switch. you'll lose comms momentarily while you switch over, but you'll know right away to get the PSU fixed.
Jason
If you're only concerned about redundancy then you can put both power supplies in the same location, and there won't be a risk of a ground loop.
However, if you have them both paralleled and one drops out how will you know that you've lost redundancy?
you might be better off with an A/B switch. you'll lose comms momentarily while you switch over, but you'll know right away to get the PSU fixed.
Jason
Re: 2 clearcom power supplies on the same partyline
Wouldn't be that hard to rig up an automatic failover box if one were so inclined
Wouldn't be that hard to rig up an automatic failover box if one were so inclined
Re: 2 clearcom power supplies on the same partyline
True, but unless you build in some mechanism to notify you that it has switched over, then it might as well not exist.
Jason
True, but unless you build in some mechanism to notify you that it has switched over, then it might as well not exist.
Jason