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Even though no electronics is involved, and it is a matter of simple
electrical construction (some consideration given to constant impedance), how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! BTW, BNC is Bayonet Neill-Concelman, and not Bayonet Navy Connector as some would believe. Neill created the N connector, and Concelman the C connector and they combined forces to create the BNC (and TNC) |
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"gareth" wrote in news:lv91j4$gv9$1@dont-
email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Why do you want to do that? Some wheels are definitely best not reinvented. BNC's can be had on eBay as easily as used matchsticks used to be seen on a street, it's not like we have to make do without. N connectors are expensive, but there are likely good reasons for that, partly bulk size, precision requirements, and a lower size of market (by far) than for BNC. Unless you wanted a bespoke connector at great expense to either do something really new, or to freeze out an easy chance of anyone connecting to your stuff, there is no point, the costs are extreme. The last two big plug innovations I thought about much were the digital ones, USB and FireWire. USB went for royalty-free manufacture, knowing that the vast market would make it indispensible so they could get their money made on sales to that vast market. FireWire was closer to the RF market in being smaller, more demanding in quality and precision and power capability, and went for royalties on the grounds that the smaller market tended to have deeper pockets. Both methods worked, nether connector 'beat' the other. As far as I know, the only connector easy to make cheaply as DIY is the 4mm plug, and then only if you can do VERY tight tolerances for good fit, to avoid having to make complicated springs and such. The sim[plest, most common things, are often the most difficult and expensive. How much does a transistor cost? 10 million bucks, until you made more of them than you can ever count. It's not to bad with plugs but the logic is similar. |
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"gareth" wrote in news:lv91j4$gv9$1@dont-
email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Also, following on from my other post, given how good BNC's are, and how cheap they are, instead of trying to find alternatives, I try to find ways to use BNC's for other purposes, not hard given the range of high quality adapters! This is NOT a wheel we need to reinvent, I think. |
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Lostgallifreyan wrote in
: Also, following on from my other post, given how good BNC's are, and how cheap they are, instead of trying to find alternatives, I try to find ways to use BNC's for other purposes, not hard given the range of high quality adapters! This is NOT a wheel we need to reinvent, I think. Small further bit... Another connector so good given its cost and ability to do many things is the standard 3-pin XLR, especially the Neutrik ones, for best ratio of cost and performance. I have no idea what they might be like for RF, but I use them for audio and DC power. (Small modification: remove one pin, link it internally with fuse wire, key the empty socket to block intact audio plugs, that way there's no danger of mixing them. They can take 16A and are physically secure). Point being that several connector types are so good that applying them in wider contexts is a better solution than inventing new ones in most cases, not least because the increase in market will bring the cost per unit down, so we all win. |
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Lostgallifreyan wrote:
"gareth" wrote in news:lv91j4$gv9$1@dont- email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Why do you want to do that? Some wheels are definitely best not reinvented. BNC's can be had on eBay as easily as used matchsticks used to be seen on a street, it's not like we have to make do without. N connectors are expensive, but there are likely good reasons for that, partly bulk size, precision requirements, and a lower size of market (by far) than for BNC. Unless you wanted a bespoke connector at great expense to either do something really new, or to freeze out an easy chance of anyone connecting to your stuff, there is no point, the costs are extreme. The last two big plug innovations I thought about much were the digital ones, USB and FireWire. USB went for royalty-free manufacture, knowing that the vast market would make it indispensible so they could get their money made on sales to that vast market. FireWire was closer to the RF market in being smaller, more demanding in quality and precision and power capability, and went for royalties on the grounds that the smaller market tended to have deeper pockets. Both methods worked, nether connector 'beat' the other. As far as I know, the only connector easy to make cheaply as DIY is the 4mm plug, and then only if you can do VERY tight tolerances for good fit, to avoid having to make complicated springs and such. The sim[plest, most common things, are often the most difficult and expensive. How much does a transistor cost? 10 million bucks, until you made more of them than you can ever count. It's not to bad with plugs but the logic is similar. Just an FYI. Big G is trolling, here. He's currently being shunned in uk.radio.amateur as the good and decent users of that group have finally had enough of him. Consequently, he's starved for attention, hence the inane postings he's vomiting left, right and centre. He's best avoided. -- Stephen Thomas Cole // Sent from my iPhone |
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On 9/16/2014 11:14 AM, Lostgallifreyan wrote:
"gareth" wrote in news:lv91j4$gv9$1@dont- email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Why do you want to do that? Some wheels are definitely best not reinvented. BNC's can be had on eBay as easily as used matchsticks used to be seen on a street, it's not like we have to make do without. N connectors are expensive, but there are likely good reasons for that, partly bulk size, precision requirements, and a lower size of market (by far) than for BNC. Unless you wanted a bespoke connector at great expense to either do something really new, or to freeze out an easy chance of anyone connecting to your stuff, there is no point, the costs are extreme. The last two big plug innovations I thought about much were the digital ones, USB and FireWire. USB went for royalty-free manufacture, knowing that the vast market would make it indispensible so they could get their money made on sales to that vast market. FireWire was closer to the RF market in being smaller, more demanding in quality and precision and power capability, and went for royalties on the grounds that the smaller market tended to have deeper pockets. Both methods worked, nether connector 'beat' the other. As far as I know, the only connector easy to make cheaply as DIY is the 4mm plug, and then only if you can do VERY tight tolerances for good fit, to avoid having to make complicated springs and such. The sim[plest, most common things, are often the most difficult and expensive. How much does a transistor cost? 10 million bucks, until you made more of them than you can ever count. It's not to bad with plugs but the logic is similar. Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. Anything less and he wouldn't be a REAL HAM. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
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"Stephen Thomas Cole" wrote in message
... Just an FYI. Big G is trolling, here. He's currently being shunned in uk.radio.amateur as the good and decent users of that group have finally had enough of him. Consequently, he's starved for attention, hence the inane postings he's vomiting left, right and centre. He's best avoided. A review of Cole's recent postings into uk.radio.amateur will reveal who is really the troll, for he never posts amythimg that is relevant to amateur radio, and in the 2 years that he has been subscribing has attacked almost every real radio amateur with campaigns of gratuitous and offensive remarks, just as he does above. His use of the emotive, "vomiting" says all that is need to be said about him. |
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"Jerry Stuckle" wrote in message
... Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. Anything less and he wouldn't be a REAL HAM. Setting aside the sarcasm that is in your post, what you outline is indeed the characteristic of the real ham, someone who is technically motivated and finds things out for himself. One of the saddest aspects of today's technology is the arrival of computers and the opportunities to roll one's own programs and yet the CBisation of buying software off the shelf has ruined that opportinity. Still, for thee and me, it represents acertain degree of job protection! (40 years real-time embedded softy) |
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On 16/09/2014 16:53, Jerry Stuckle wrote:
Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. PS - don't feed the troll :-) |
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On 16/09/2014 17:02, gareth wrote:
Still, for thee and me, it represents acertain degree of job protection! What job's that then? |
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On 9/16/2014 12:33 PM, Jeefaw K. Effkay wrote:
On 16/09/2014 16:53, Jerry Stuckle wrote: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. PS - don't feed the troll :-) Why said they were coax connectors for a transmitter? I use various types of connecters for many things. For instance, my Tektronix scope has BNC connectors for the probes. And my rigs have connectors for the microphones. Plus I wouldn't use balanced line in the car. I use a lot of connectors for a lot of different things :) -- ================== Remove the "x" from my email address Jerry Stuckle ================== |
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On 16/09/2014 17:49, Jerry Stuckle wrote:
On 9/16/2014 12:33 PM, Jeefaw K. Effkay wrote: On 16/09/2014 16:53, Jerry Stuckle wrote: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. PS - don't feed the troll :-) Why said they were coax connectors for a transmitter? I use various types of connecters for many things. For instance, my Tektronix scope has BNC connectors for the probes. And my rigs have connectors for the microphones. Real hams don't use microphones. They only use CW :-) Plus I wouldn't use balanced line in the car. OK - you win :-) |
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On Tue, 16 Sep 2014, Lostgallifreyan wrote:
"gareth" wrote in news:lv91j4$gv9$1@dont- email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Also, following on from my other post, given how good BNC's are, and how cheap they are, instead of trying to find alternatives, I try to find ways to use BNC's for other purposes, not hard given the range of high quality adapters! This is NOT a wheel we need to reinvent, I think. Especially when you can find them lying on the sidewalk. Some years back, I came upon a pile of junk on the sidewalk, waiting for the garbage truck. I poke around, and find a near endless number of BNC connectors. I grab some, then continue on my way. Coming back, the rest were still there so I grabbed all of them. QUite a weight once accumulated. There were a few hundred BNC connectors. The only problem was, they were mostly male, though some female and some adapters. Yes, I'd use BNC for audio connectors (something others have done) if I was going to change connectors (or building something new) and probably more important, if this pile had included more female connectors. The bad part is, an even longer time ago, the local surplus place had some odd bit of plastic with one of those coaxial power connectors, 2 or 3 female BNC connectors and I think a DB-25 connector on it. All for 79cents. I bought some, but obviously if I'd known I'd be finding a near endless supply of male BNC connectors, I'd have stocked up more in anticipation. That's reality, you never find the matching stuff at the same time. Michael |
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On Tue, 16 Sep 2014, Jeefaw K. Effkay wrote:
On 16/09/2014 16:53, Jerry Stuckle wrote: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. And you can certainly make ladder line yourself, once you figure out something for the spacers. I doubt anyone's ever made coax at home. Michael PS - don't feed the troll :-) |
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"Michael Black" wrote in message
news:alpine.LNX.2.02.1409161411150.29263@darkstar. example.org... I doubt anyone's ever made coax at home. It would be an interesting exercise to conceive of the mechanism for weaving the braid, such that it was tight onto the dielectric |
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In rec.radio.amateur.homebrew Michael Black wrote:
On Tue, 16 Sep 2014, Jeefaw K. Effkay wrote: On 16/09/2014 16:53, Jerry Stuckle wrote: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. And you can certainly make ladder line yourself, once you figure out something for the spacers. I doubt anyone's ever made coax at home. Michael I've made short lengths of rigid, air dielectric coax for UHF projects from hobby store brass tubing on several occasions. -- Jim Pennino |
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Stephen Thomas Cole wrote in
: Just an FYI. Big G is trolling, here. He's currently being shunned in uk.radio.amateur as the good and decent users of that group have finally had enough of him. Consequently, he's starved for attention, hence the inane postings he's vomiting left, right and centre. He's best avoided. Well, no problem there. I just took up the suject as I saw it. I won't try to talk to Gareth directly, he has never once responded to me as far as I know. I suspect maybe I do not have the right kind of degree and gentlemanly air of electromic authority for him to deign to even notice me. :) |
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Jerry Stuckle wrote in news:lv9mdp$a3o$1@dont-
email.me: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. Nice. A similar logic applies to knowledge in general. I once got flamed on a forum for stating a bit of (correct) info simply because it seemed to someone that I had picked it up from others, and they felt I hadn't contributed enough of my own experience to their field (lasering is a ridiculously expensive hobby, so I accept no fault there, given that offering stuff or knowledge for free usually gets the upturned nose anyway). Also, the attitude denies the value of all teaching, so I don't take it too seriously even when I get hurt by it. If we do too much, there will be someone to flame us. That same person might be the first to flame if we do too little. :) |
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Michael Black wrote in
news:alpine.LNX.2.02.1409161406070.29263@darkstar. example.org: Yes, I'd use BNC for audio connectors (something others have done) if I was going to change connectors (or building something new) and probably more important, if this pile had included more female connectors. I've used them for DC power too, sometimes. :) Given the quality of the pin surface and material, and a teflon former, this isn't a bad idea, it's likely to handle surges better, and more safely, than many connectors intended to do it. You mention a DB25, another favourite for me. So many pins, each can handle over an amp, some will handle 2A each. For specialised heavy current situations, (perhaps up to 25 A with the better ones, it can be much cheaper to do it that way than with dedicated high current connectors, and it's far more compact too, and the flexibity of the cable is usually better too. (And tens of yards of that cable got thrown out during various company somputer refits, more than I ever imagined any use for). When Maplin did a closing deal on a bunch of metal hoods I bought 40 of them. I doubt I'll ever run out of those, or have to spend any money on more except on occasional need for strange angles in tight spaces. |
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Michael Black wrote in
news:alpine.LNX.2.02.1409161603130.29800@darkstar. example.org: I've made short lengths of rigid, air dielectric coax for UHF projects from hobby store brass tubing on several occasions. That's true. For inside a chassis. And I suppose making rigid is much easier than making flexible coax, since you can get that brass tubing. I've never used it for that (not done much RF work at all), but I like it, it's very precise (and in the UK and on eBay precision imperial sized tools to go with it are often a lot cheaper than metric, and mixing units can offer suprising answers to tough problems, like tight fits of 4mm into a 5/32 hole or a bit of that tubing of same size ID (3.96875mm). (Which incidentally might help answer the original question, as one way to make accurate DIY 4mm sockets.) Brass brazing rods can also be used, they're supplied very clean, straight, and with even thicknesses, and I suspect hard drawn quality too. If I had to make a aired cored coax I might hard-draw a bit of stripped mains cable by hanging it off the top of a door and putting my weight on it to pull the other end. I have done that a few times and got very good straight copper bars that way in thicknesses up to about 2mm diameter. |
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"Lostgallifreyan" wrote in message
.. . Stephen Thomas Cole wrote in : Just an FYI. Big G is trolling, here. He's currently being shunned in uk.radio.amateur as the good and decent users of that group have finally had enough of him. Consequently, he's starved for attention, hence the inane postings he's vomiting left, right and centre. He's best avoided. Well, no problem there. I just took up the suject as I saw it. I won't try to talk to Gareth directly, he has never once responded to me as far as I know. I suspect maybe I do not have the right kind of degree and gentlemanly air of electromic authority for him to deign to even notice me. :) I replied to you on the 28th August last ... "Lostgallifreyan" wrote in message . .. "gareth" wrote in news:lthnu9$ilc$1@dont- email.me: There have been designs published in Brit of using the steel of wind-up tape measures, and this could be a potential starting point for any discussion, by the use of flat metal tape. I suspect my notion is not new, but what about a coil of wire, some well- spaced trees, a long lanyard, a tennis ball, and a spud gun? Someone will likely have one they prepared earlier, so I won't put the bits together. :) A well-tried and tested solution to one problem, but I'd be interested in a structure that when you go QRT, you could then retract it back. |
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"gareth" wrote in news:lva5pq$57b$1@dont-
email.me: I replied to you on the 28th August last ... I stand corrected. :) |
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Lostgallifreyan wrote:
Stephen Thomas Cole wrote in : Just an FYI. Big G is trolling, here. He's currently being shunned in uk.radio.amateur as the good and decent users of that group have finally had enough of him. Consequently, he's starved for attention, hence the inane postings he's vomiting left, right and centre. He's best avoided. Well, no problem there. I just took up the suject as I saw it. I won't try to talk to Gareth directly, he has never once responded to me as far as I know. I suspect maybe I do not have the right kind of degree and gentlemanly air of electromic authority for him to deign to even notice me. :) Sadly, he appears to be mentally defective. -- Stephen Thomas Cole // Sent from my iPhone |
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"Jeefaw K. Effkay" wrote:
On 16/09/2014 17:49, Jerry Stuckle wrote: On 9/16/2014 12:33 PM, Jeefaw K. Effkay wrote: On 16/09/2014 16:53, Jerry Stuckle wrote: Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his own ore (using a garden trowel and blowtorch). He would create his own insulating material from raw materials (bakelite would probably be easiest), and finally shape and assemble the final product. A real ham wouldn't make coaxial connectors. A real ham would be using a link-coupled output from his PA, to a balanced transmission line. PS - don't feed the troll :-) Why said they were coax connectors for a transmitter? I use various types of connecters for many things. For instance, my Tektronix scope has BNC connectors for the probes. And my rigs have connectors for the microphones. Real hams don't use microphones. They only use CW :-) Plus I wouldn't use balanced line in the car. OK - you win :-) It's illegal to text while driving, but what about using a key? -- 73 de Frank Turner-Smith G3VKI - mine's a pint. |
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wrote in message
... I've made short lengths of rigid, air dielectric coax for UHF projects from hobby store brass tubing on several occasions. .... and for the main line in an SWR meter |
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On 16/09/2014 19:43, gareth wrote:
"Michael Black" wrote in message news:alpine.LNX.2.02.1409161411150.29263@darkstar. example.org... I doubt anyone's ever made coax at home. It would be an interesting exercise to conceive of the mechanism for weaving the braid, such that it was tight onto the dielectric Would you need to weave braid? Could it not be made by wrapping the dielectric in foil? Spiral winding foil or otherwise wrapping in foil would seem to be a lot easier than braiding on the fly. Andy |
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On 16/09/2014 19:10, Michael Black wrote:
Especially when you can find them lying on the sidewalk. Some years back, I came upon a pile of junk on the sidewalk, waiting for the garbage truck. I poke around, and find a near endless number of BNC connectors. I grab some, then continue on my way. Coming back, the rest were still there so I grabbed all of them. QUite a weight once accumulated. There were a few hundred BNC connectors. I wonder if this was at the time when networks were moving from coax to UTP? I still have a wonderful collection of BNC patch leads which were surplus when my company switched over. Les. |
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"Lordgnome" wrote in message
... On 16/09/2014 19:10, Michael Black wrote: Especially when you can find them lying on the sidewalk. Some years back, I came upon a pile of junk on the sidewalk, waiting for the garbage truck. I poke around, and find a near endless number of BNC connectors. I grab some, then continue on my way. Coming back, the rest were still there so I grabbed all of them. QUite a weight once accumulated. There were a few hundred BNC connectors. I wonder if this was at the time when networks were moving from coax to UTP? I still have a wonderful collection of BNC patch leads which were surplus when my company switched over. Including some 50 ohm terminators that are far too small to be any good as a dummy load? |
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AndyW wrote:
On 16/09/2014 19:43, gareth wrote: "Michael Black" wrote in message news:alpine.LNX.2.02.1409161411150.29263@darkstar. example.org... I doubt anyone's ever made coax at home. It would be an interesting exercise to conceive of the mechanism for weaving the braid, such that it was tight onto the dielectric Would you need to weave braid? Could it not be made by wrapping the dielectric in foil? Spiral winding foil or otherwise wrapping in foil would seem to be a lot easier than braiding on the fly. Andy I salvaged a load of old Rediffusion coax that was hooked to my house and that had sheet copper wrapped around the dielectric. -- Stephen Thomas Cole // Sent from my iPhone |
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On 17/09/14 01:14, Lostgallifreyan wrote:
"gareth" wrote in news:lv91j4$gv9$1@dont- email.me: how difficult it is to manufacture our own plugs and sockets, despite that BNC and N have been around for 70 years, with SMC some time later! Why do you want to do that? Some wheels are definitely best not reinvented. BNC's can be had on eBay as easily as used matchsticks used to be seen on a street, it's not like we have to make do without. N connectors are expensive, but there are likely good reasons for that, partly bulk size, precision requirements, and a lower size of market (by far) than for BNC. Unless you wanted a bespoke connector at great expense to either do something really new, or to freeze out an easy chance of anyone connecting to your stuff, there is no point, the costs are extreme. I've thought about doing similar from time to time. Not for RF mind you, BNC serves me well here. My needs are more for audio/control connectors. My connection system has varied a bit over the years. In the beginning I used 8-pin DIN connectors, which worked okay, but didn't quite have enough contacts to handle all the controls I wanted. I was looking for a connector that would handle: - stereo audio (so 3 or 4 lines, depending if they were to share a return line) - microphone audio (2 lines) - PTT - 4 direction buttons 8 pins wasn't going to suffice for this. So I moved to DB15HD connectors. Some might recognise these on VGA video cards. I used an opposite polarity so as to prevent confusing them with a video card. (one of my adaptor leads allowed me to use headsets with a computer) These were convenient being all on one connector, and small, but they do *not* like being exposed to weather much. I was replacing them on a regular basis. The regular DB15 might be better, I haven't tried. My next stop has been to split it into two connectors: a DIN5 carries headset audio (microphone and two speakers), and the PTT and buttons are on a separate DIN6. This is more reliable, although I note the connectors have a tendency to come apart from time to time. I put up with it though, because the same connectors have lasted much better than the DB15HDs did. If I did "my own", I'd probably use 6.5mm phono plugs taped together. Crude, but effective. Kenwood still use a similar arrangement for their handhelds and it works well enough there. |
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On 17/09/14 06:04, Lostgallifreyan wrote:
Michael Black wrote in news:alpine.LNX.2.02.1409161406070.29263@darkstar. example.org: Yes, I'd use BNC for audio connectors (something others have done) if I was going to change connectors (or building something new) and probably more important, if this pile had included more female connectors. I've used them for DC power too, sometimes. :) Given the quality of the pin surface and material, and a teflon former, this isn't a bad idea, it's likely to handle surges better, and more safely, than many connectors intended to do it. I've used a BNC once for power, basically in a situation where we didn't have anything else to hand. Probably the most inappropriate use of a connector I've seen was a pair of Belling-Lee connectors for power. With both shell and centre shorted, one for positive, the other for negative. Not bad for current carrying capability, but the thought of the two meeting with a bang gave me the willies. My TS-120S was supplied with a cable fitted in such a manner. It was the first "modification" I made: replacing it with 30A Anderson powerpole connectors. A single Belling-Lee using centre for positive, shell for negative *might* be okay, two just using the centres might be okay too, but no way was I going to have shells with opposing polarities in such proximity. You mention a DB25, another favourite for me. So many pins, each can handle over an amp, some will handle 2A each. For specialised heavy current situations, Yep, I use them on the bicycle mobile station. Inside a motorcycle top box I have my FT-857D mounted with a break-out cable that takes DB25 to a 8P8C connector for the microphone and 6P6C for the head, as well as two 3.5mm connectors for speaker and CW key. At the other end I have a similar break-out to plug in my headset, the head unit and the control buttons. The DB25-DB25 connectors are linked with 3 runs of CAT5e, giving me 24 usable pins. I did try using an old printer extension cable, but found I got cross-talk from the head unit comms cable into the microphone. CAT5 works well though, and isn't difficult to manufacture. |
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Stuart Longland wrote in news:6meoeb-
: replacing it with 30A Anderson powerpole connectors. I nearly went with those for my offgrid PV system, but decided that modifed 3-pin XLR was good enough for me. I rarely use the full 16A capability anyway.. In the one case where I do at times, I just put two plugs on the cable. :) |
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On Wed, 17 Sep 2014, Lordgnome wrote:
On 16/09/2014 19:10, Michael Black wrote: Especially when you can find them lying on the sidewalk. Some years back, I came upon a pile of junk on the sidewalk, waiting for the garbage truck. I poke around, and find a near endless number of BNC connectors. I grab some, then continue on my way. Coming back, the rest were still there so I grabbed all of them. QUite a weight once accumulated. There were a few hundred BNC connectors. I wonder if this was at the time when networks were moving from coax to UTP? I still have a wonderful collection of BNC patch leads which were surplus when my company switched over. This had to be some individual, it was next to an apartment building, and the connectors were all in a drawer from a bureau. There were some junk computer boards in a box next to it. YOu have to be in the right place at the right time, bcause otherwise you won't see it, and chances are good no one else who can appreciate such finds will come along while it's there. Michael |
The Compleat Angler?
On 18/09/14 04:52, Lostgallifreyan wrote:
These were convenient being all on one connector, and small, but they do *not* like being exposed to weather much. I was replacing them on a regular basis. The regular DB15 might be better, I haven't tried. I remember someone posting about a motorbike and weathering of various plugs (maybe you?). Probably not me. I've been on the back of a motorcycle exactly once and ridden a quad-bike once. My bikes are very much motor-less. http://stuartl.longlandclan.yi.org/b.../09/vk4msl-bm/ I can't remember the details, but I think he found a part-answer in using lots of PFPE grease to exclude water. The stuff is often used on vehicles because it tends to stay put and not form a grinding paste with all the grit that lands on it. Interesting concept, I wonder how that affects conductivity… |
The Compleat Angler?
Frank Turner-Smith G3VKI wrote:
It's illegal to text while driving, but what about using a key? On most cars, it's compulsory. If you don't turn it, the engine won't start. -- Chris G4FZN |
The Compleat Angler?
In message , Chris Kirby
writes Frank Turner-Smith G3VKI wrote: It's illegal to text while driving, but what about using a key? On most cars, it's compulsory. If you don't turn it, the engine won't start. There are stringent laws specifically relating to the use of phones in vehicles. Unless the phone has a key, they won't apply. However, you could still get got under other laws. -- Ian |
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