A male N center contact is quite a bit larger than a male BNC contact. It will usually ruin the female for future use with a BNC. It is also a serious oversight that banana peels and peanut butter sandwitches fit in the slot of VHS recorders. Such actions usually tun the VHS recorder inoperable and also foul the eject system which necessitates a round trip to a repair shop. Another common one was kids rapidly flipping the TV on and off rapidly until it no longer came on again…. Interesting, I would have thought to maintain a constant impedance of 50 ohms, the ratio of the inner pin to the outer ground of the female N and the female BNC would be exactly the same size, therefore resulting in the inner pin being exactly the same size on both.
If the BNC pin was smaller, then it would have a higher impedance than the N connector. I have always wondered how the impedance quality and other parameters of the connectors is determined and where I can find some mathematical theory that supports it. You could always go right back to Maxwell, or even Jackson.
Essentially a relationship of the diameter of the dielectric, the center conductor and the dielectric constant of the dielectric. Some RF circuits eg. Return Loss Bridge use coax like a transformer: primary winding is the center conductor, secondary winding is outer conductor. It is therefore preferred for carrying signals not power over longer distances. Depending on the frequency, you get good results between ohms, with 50 and 75 getting the best results for transmitting at HF to UHF frequencies.
Sample image. Matrix of many many channels in good old analog days. You think that is close together.. They stagger the height of the connectors to pack them much closer than that! Made quite a racket when the ruddy router vanished in a puff of hawking radiation I mean to tell you.
SMA connectors. It had 11 BNCs and a power connector on the back. This has reminded me that I once had a complete set of tools for stripping coax and crimping connectors, which has now been replaced with the same sort of tools for making ethernet cables.
Stripper, crimper, RJ inserts and lots of boots in different colours. And a cable tester. I seem to remember it was a 50 ohm device. All video installations included patch bays with paired rows of recessed MUSA jacks. Cables had sockets on the end. Equipment was connected so that outputs were on the top row and inputs on the bottom with U-links connecting the rows. By removing a link you could break into the circuit and route it somewhere else. The stuff in the linked images is modern and designed for 75 ohm cabling to use with SDI.
Modern racks have a BNC on the back. The gear showed up at my school in the early s, having been surplused out by Bell and gifted to us. I suppose it might have been a decade old when I saw it. When was the MUSA introduced? I splurged on a crimper and a box or two of 50ohm Canare crimps. High quality, and much better performance than the unknowns of ebay specials.. The only problem is I got a bit carried away with the crimper and now I have too many BNC cables and adapters to know what to do with…..
I would like to see an article on the original full size banana plugs and jacks. With metal shells they were nearly indestructible. The wiping action as well as spring-loaded contacts made them self-cleaning as well as very low resistance.
Widely used by the military in World War II. Quickly and easily connected and disconnected, yet very secure. Yet, in spite of their many advantages, they are rarely seen on new equipment today. Son of a gun. All these years, and I never noticed that. They used to be very common on European radio receivers, tape recorders, etc. These would of course still fit right into ordinary mains outlets and mis-plugging was known to cause pain and destruction… So towards the end of the s, a number of DIN standards were invented and put into use, making the plugs and sockets all different ones for FM, AM and TV antennas, all Ohm balanced; speakers.
They remained in use on professional equipment and on equipment such as laboratory power supplies and instrumentation. Other equipment such as signal generators had SO connectors which will accept a 4mm plug in the center, and usually there would be a 4mm chassis socket for a ground connector next to it But people that would use this kind of equipment knew enough not plug them straight into the mains.
I had set of Christmas tree lights that had banana plugs instead of a normal mains plug. It was really a bad and dangerous idea. But in that time it was generally accepted, that not every object around us has to be completely idiot proof. Ahh, the days of walking around with a bunch of BNC terminators in your pocket and unfortunately nicknamed female-female adapters. If I remove it from the pocket, it accumulates in said jar and I have to deal with it later.
I prefer to keep the level of it in pocket low, just by using it regularly. Anybody want to do a short piece, with attribution, on the lineage of the BNC acronym? I was the silly one. Your comment, Lufo, brings out a good point. Acronyms are usually industry specific. It has also been shown to stand for Bayonet Navy Connector in some references. The BNC connector is essentially a miniature version of the C connector which was in turn a bayonet version of the N-type connector.
The BNC connector was developed as a result of the need to provide a high quality, robust connector that would be capable of being used in a wide variety of applications. Additionally it needed to be smaller than either the N-type or C-type connectors which were much larger. The specifications of the BNC connector naturally vary from one manufacturer to another and it is always best to ensure that the particular component being purchased is suitable for the intended application.
However there are a number of guidelines that can be used. The connector comes in two basic types:. Of the two versions of the BNC connector, the 50 ohm version is more widely used. Often the BNC connector is specified for operation at frequencies up to 4 GHz and it can be used up to 10 GHz provided the special top quality versions specified to that frequency are used.
However it is wise to fully check the specification. BNC connectors come in a variety of formats. Not only are there plugs and sockets but there are also adapters and also other items such as attenuators. BNC plugs are designed not only for the required impedance, but also to accept a particular coax cable format. In this way all the internal piece parts are compatible with the coaxial cable used. It is therefore necessary to specify the BNC plug for use the cable to be used.
Although there is some latitude, it is naturally best to select the correct cable format. In addition to this there are straight and right angled variants. Of these the straight connectors are the most widely used, although right angled connectors where the cable leaves the plug at right angles to the centre of the connector centre line are also available.
These are ideal in many applications where the cables need to leave the connector in this manner to ensure cables are in a tidy fashion, or where space is at a premium. Unfortunately right-angled connectors have a marginally higher level of loss than their straight through counterparts. This may not be significant for most applications, but at frequencies near the operational limit of the connector there may be a small difference.
The sockets or female BNC connectors also come in a number of flavours. The very basic BNC connector consists of a panel mounting assembly with a single connection for the coax centre. The earthing is then accomplished via the panel to which the connector is bolted using a single nut.
Many installers prefer the second method as there is no need to guess about the length of the coax core; in the second method, the core is visible, leaving very little room for error. Additionally, many installers prefer method two as F-connectors can be used in most TV installations as well as in surveillance system installation Middletown, CT Mammoth Security office will help you.
Not only does this mean that they can eliminate at least one more material on the average run, but also, it means that they are exceptionally good at their job as they do it all the time. The F-Crimp connector method is similar to the F-compression connector one except that a crimp-on connector is used instead of a compression one. Like with the above method number 2 , a F connector is attached to the cable first, and then a screw-on BNC connector. The crimp-on BNC connector is also available in two styles: 2-piece and 3-piece.
Installing cables using the 2-piece BNC crimp-on connectors requires two tools: a crimping tool and a cable stripper. Though this process takes slightly longer than any of the others, the end result is a secure connection and cables that are not bound to come lose any time after installation. At Mammoth Security, we want to make sure that your CCTV surveillance system has a secure connection and that all your cables stay where they need to be.
For this reason, we use only the most durable components when building your systems, such as BNC connectors.
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