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What coaxial cable for MPX of around 30meters
https://forums.stereotool.com/viewtopic.php?f=22&t=31256		 Page 2 of 2
Author:  hvz [ Tue Apr 04, 2023 11:30 am ]
Post subject:  Re: What coaxial cable for MPX of around 30meters
Quote:
Quote:
Use RCA, No point of balanced since your MPX input is not balanced. Also for Juli@'s balanced output you need custom cables! (3pin)
For 30m cable you really need good one. Just look to be 50ohm, also to be double shielded.
Cables for 5GHz WiFfi can also be good. Just dont waste money on that cable.
ESI's RCA is Digital Output. Can MPX out be get from it?
If it supports 192 kHz, then usually yes. I can't tell if this always works, but we have never had an issue connecting Spdif to AES/EBU, which your transmitter probably expects. Note that the transmitter also needs to support 192 kHz digital MPX input, left/right won't work.
Author:  NRG [ Tue Apr 04, 2023 1:07 pm ]
Post subject:  Re: What coaxial cable for MPX of around 30meters
None, the recommended length for mpx signals with rg58 is 1.80 m , for rg59 less than 3m , beyond these lengths you will have a strong loss of separation.

Orban 8100 manual

Composite ( Baseband) Output
Source Impedance: 470 ohms, independent of OUTPUT ATTEN setting, unbalanced.
Level: variable 0 to greater than 4V p- p by means of 15- turn OUTPUT ATTEN
control.
Connector: Type BNC held floating over chassis ground to permit interface to
various exciters without need for wideband transformer for ground loop suppression.
RF suppressed.
Recommended Maximum Cable Length: 6ft ( 1.8m) RG-58A/U.


pag.L4

https://worldradiohistory.com/Archive-C ... l-1986.pdf
Author:  mm1980 [ Wed Apr 19, 2023 1:00 pm ]
Post subject:  Re: What coaxial cable for MPX of around 30meters
Nope, graph in 8500 manual tells different story.
RG58 capacity per meter is 100pf/m.
According to graph degradation starts at about 4nf (about 55dB separation). That's more than any commercial receiver can separate @15KHz.
So, 30 meters is fine.
I have one installation with 17m RG58 and the separation is above 45dB (this is maximum ability of the Studer tuner to separate the channels).
Author:  Greg Strickland [ Tue Aug 22, 2023 12:23 am ]
Post subject:  Re: What coaxial cable for MPX of around 30meters
Koenzk what kind of transmitter are you using? Why do you need 30 meters of composite audio line? Consider spending the money on lower loss, larger diameter RF coax on the antenna side.
Author:  Koenzk [ Thu Nov 16, 2023 1:52 pm ]
Post subject:  Re: What coaxial cable for MPX of around 30meters
Quote:
Koenzk what kind of transmitter are you using? Why do you need 30 meters of composite audio line? Consider spending the money on lower loss, larger diameter RF coax on the antenna side.
I'm using a RVR PTX 30-LCD (https://www.rvr.it/en/products/compact- ... -tbq7c5ux/) transmitter now.
I ended up using the balanced TRS jacks of the ESI Juli@ soundcard as the RVR PTX 30-LCD has a balanced MPX input (XLR) with a cable of 25 meters/80 feet.
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