![]() | This article is rated Stub-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
|
The picture is labelled incorrectly. The connector on the end of the length of cable is a Socket and the panel mounting connector is a Plug. I will try and take some better pictures. -- jmb 12:07, 30 June 2006 (UTC)
The connector is properly (And popularly) known as a MUSA. It's a (reasonably obscure) acronym. I seem to remember it's something like Msomething Unit Steerable Antenna. It was orignally developed to go in the middle of an antenna, as it allowed joints to rotate (or something like that) but got taken up by the broadcasting industry. —Preceding unsigned comment added by 132.185.144.123 ( talk) 15:46, August 29, 2007 (UTC)
To substantiate my change of the impedance to 50ohm, work it out yourself! The inside measurement of the male screen is something like 6.8mm. The centre female contact is 3mm, the dialectric (air) has a constant of 1. The formula is (i think...)
138^elog(D/d)
D=inside screen diameter
d=centre contact diameter
e=dialectric constant
What is interesting is that some connector manufactures have redesigned the original to become acceptable to HDTV bandwidth requirements while still preserving the original 50ohm characteristic of the Musa barrel and U-link. I think they have done this by smoothing the transition of the differant impedances. It is the sudden changes in impedance that causes the reflections that cause poor performance
and by properly marrying the 75 ohm BNC end to the 50 ohm Musa they meet the -15dB return loss quoted by SMPTE. I have put this on Talk as I won't be trying to quote referances and a lot of this is my opinion but i'm interested and would like anyone to properly prove, disprove or correct anything i have said (especially the formula as it might be wrong cos it was from memory...)(
Virtualinsanity (
talk)
15:51, 24 November 2007 (UTC))
This connector is also known as BPO connector. See: "Electrical Impedance: Principles, Measurement, and Applications" by Luca Callegaro, CRC press, 2012, page 83.
Also, please provide some reference, any reference.
Please provide the physical dimensions or reference to a know standard.
Most connectors are becoming obsolete, true. This is not a reason for forgetting their history.
132.246.53.63 ( talk) 22:00, 29 November 2016 (UTC)
I have vague memories of a European connector used in video applications, including as U-link connectors for jumper panels, and was connected/disconnected by a straight push/pull as per MUSA and Belling-Lee connectors, and roughly twice the size of those two: maybe 15mm OD and pin diameter maybe 4mm. It was known to us as a Fernseh connector, no doubt named for the German (?) video equipment company. Anyone have more info? Doug butler ( talk) 00:18, 8 August 2017 (UTC)
![]() | This article is rated Stub-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
|
The picture is labelled incorrectly. The connector on the end of the length of cable is a Socket and the panel mounting connector is a Plug. I will try and take some better pictures. -- jmb 12:07, 30 June 2006 (UTC)
The connector is properly (And popularly) known as a MUSA. It's a (reasonably obscure) acronym. I seem to remember it's something like Msomething Unit Steerable Antenna. It was orignally developed to go in the middle of an antenna, as it allowed joints to rotate (or something like that) but got taken up by the broadcasting industry. —Preceding unsigned comment added by 132.185.144.123 ( talk) 15:46, August 29, 2007 (UTC)
To substantiate my change of the impedance to 50ohm, work it out yourself! The inside measurement of the male screen is something like 6.8mm. The centre female contact is 3mm, the dialectric (air) has a constant of 1. The formula is (i think...)
138^elog(D/d)
D=inside screen diameter
d=centre contact diameter
e=dialectric constant
What is interesting is that some connector manufactures have redesigned the original to become acceptable to HDTV bandwidth requirements while still preserving the original 50ohm characteristic of the Musa barrel and U-link. I think they have done this by smoothing the transition of the differant impedances. It is the sudden changes in impedance that causes the reflections that cause poor performance
and by properly marrying the 75 ohm BNC end to the 50 ohm Musa they meet the -15dB return loss quoted by SMPTE. I have put this on Talk as I won't be trying to quote referances and a lot of this is my opinion but i'm interested and would like anyone to properly prove, disprove or correct anything i have said (especially the formula as it might be wrong cos it was from memory...)(
Virtualinsanity (
talk)
15:51, 24 November 2007 (UTC))
This connector is also known as BPO connector. See: "Electrical Impedance: Principles, Measurement, and Applications" by Luca Callegaro, CRC press, 2012, page 83.
Also, please provide some reference, any reference.
Please provide the physical dimensions or reference to a know standard.
Most connectors are becoming obsolete, true. This is not a reason for forgetting their history.
132.246.53.63 ( talk) 22:00, 29 November 2016 (UTC)
I have vague memories of a European connector used in video applications, including as U-link connectors for jumper panels, and was connected/disconnected by a straight push/pull as per MUSA and Belling-Lee connectors, and roughly twice the size of those two: maybe 15mm OD and pin diameter maybe 4mm. It was known to us as a Fernseh connector, no doubt named for the German (?) video equipment company. Anyone have more info? Doug butler ( talk) 00:18, 8 August 2017 (UTC)