|
Joined: Dec 2002
Posts: 9,424 Likes: 1
Member
|
OP
Member
Joined: Dec 2002
Posts: 9,424 Likes: 1 |
So, as some of you know, I am now part of our student radio station. Our transmitter is in the midst of being replaced and I met the station's engineer last week. We transmit our signal over dry pairs from the studio to the transmitter site. I did some looking around, and apparently they use a Western Electric 111C repeating coil on each side of the line. Can someone explain exactly what this does? Thanks, Jeff
Jeff Moss Moss Communications Computer Repair-Networking-Cabling MBSWWYPBX, JGAE
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
Joined: Jan 2005
Posts: 15,379 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,379 Likes: 13 |
It's basically a 1:1 transformer that isolates the dry pairs electrically at each end from the audio equipment in an effort to eliminate hum. If I recall correctly, there is also a series of capacitors on the line side to absorb AC hum and shunt it to ground. I haven't seen one of those things in years, so I can't speak with with complete accuracy.
Ed Vaughn, MBSWWYPBX
|
|
|
|
Joined: May 2007
Posts: 5,058 Likes: 5
Moderator-1A2, Cabling
|
Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,058 Likes: 5 |
"Where are we going and why are we in this hand basket?"
|
|
|
|
Joined: Dec 2002
Posts: 9,424 Likes: 1
Member
|
OP
Member
Joined: Dec 2002
Posts: 9,424 Likes: 1 |
The way I understand it is, there is a coil on each side, left and right. On the coil itself they mounted a 42A block. The dry pairs connect to one set of terminals, and the audio pairs connect to another. Sam, thanks for the link.
Jeff Moss Moss Communications Computer Repair-Networking-Cabling MBSWWYPBX, JGAE
|
|
|
|
Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
|
RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Never mind the answer, what a great pair of web sites! Thanks, SAM John C.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
|
|
|
|
Joined: Jun 2005
Posts: 261
Member
|
Member
Joined: Jun 2005
Posts: 261 |
Basically a nice high quality high-level audio transformer.. can be strapped for 150 or 600 ohms on each side. I've got a couple 111C's stashed out in the garage someplace..
I took a 111C, and built it into a hammond box with binding posts and XLR on both sides, with switches for impedance and ground lift on both sides for use on remote broadcasts.
|
|
|
|
Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
|
RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
And I just saw some pairs of 111's on e-bay, for anyone interested. John C.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
|
|
|
Forums84
Topics94,294
Posts638,834
Members49,769
|
Most Online5,661 May 23rd, 2018
|
|
2 members (Toner, justbill),
144
guests, and
349
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
|
|