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Tracks to nowhere?
Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? -- (\_/) (='.'=) (")_(") |
Tracks to nowhere?
On 13/12/2012 13:41, Mike Tomlinson wrote:
Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? I'd guess it's an antenna. |
Tracks to nowhere?
Chris Bartram wrote:
On 13/12/2012 13:41, Mike Tomlinson wrote: Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? I'd guess it's an antenna. +1. It's about the right size for a printed cellphone system (3G) antenna. Reinforced by the SIM1 and SIM2 letering by it. -- Tciao for Now! John. |
Tracks to nowhere?
On 13/12/12 13:41, Mike Tomlinson wrote:
Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? they are tuned circuits. open ended transmission lines. Or a bored draughtsman doodling.. -- Ineptocracy (in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers. |
Tracks to nowhere?
On 13/12/12 14:02, John Williamson wrote:
Chris Bartram wrote: On 13/12/2012 13:41, Mike Tomlinson wrote: Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? I'd guess it's an antenna. +1. It's about the right size for a printed cellphone system (3G) antenna. Reinforced by the SIM1 and SIM2 letering by it. ah. could be that as well as a tuned circuit. -- Ineptocracy (in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers. |
Tracks to nowhere?
Maybe they used to make very big wedding cakes there and when they wanted to
move them... There is a song about it Tracks of my Tiers. OK I'll go to sleep again now. Brian -- From the Sofa of Brian Gaff Reply address is active "Chris Bartram" wrote in message ... On 13/12/2012 13:41, Mike Tomlinson wrote: Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? I'd guess it's an antenna. |
Tracks to nowhere?
On Thu, 13 Dec 2012 13:41:44 +0000, Mike Tomlinson
wrote: Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? Replied in another group (diy) It is a pcb "test coupon" - used them loads of times either on the pcb or just outside the board edge so that the stack can be tested before breaking out the board. Explanation and expoded diagram he- http://www.polarinstruments.com/support/cits/AP124.html |
Tracks to nowhere?
Geo wrote in
: http://www.polarinstruments.com/support/cits/AP124.html Highly unlikely in this case. Transmission line test structures are through lines, not open ended stubs. I think it's an antenna of some sort. Doug White |
Tracks to nowhere?
Highly unlikely in this case. Transmission line test structures are
through lines, not open ended stubs. I think it's an antenna of some sort. As an antenna I don't think it would radiate very well at all. It appears to have a ground/signal/ground transmission-line structure, and its serpentine shape would tend to inhibit effective radiation. In RF applications, open-ended and shorted-ended stubs like this are often used as impedance-matching elements. At a single frequency and in the steady state they "look like" high-Q inductors or capacitors, in series or shunt across the signal. If the PCB's electrical characteristics are well controlled, it's easier to get a very reproducible amount of reactance from a stub of this sort, than it is using a lumped-value component. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Tracks to nowhere?
On Friday, December 14, 2012 5:37:50 AM UTC-7, Doug White wrote:
Geo wrote in : http://www.polarinstruments.com/support/cits/AP124.html Highly unlikely in this case. Transmission line test structures are through lines, not open ended stubs. I think it's an antenna of some sort. Doug White I'm the person who posted the picture, and I should have mentioned that it's a PC motherboard, MSI brand, model Z68A-G43(G3). It has no wireless built into it. I once found an antenna inside a Panasonic-made CRT monitor, around the flyback. It was 1-2 pieces of circuit board material, each about 3" long and 1/2" wide. In the schematic, it was connected to a flyback winding that went nowhere else. Apparently the antenna put out a signal to counteract interference generated by the flyback. transformer. |
Tracks to nowhere?
"Mike Tomlinson" wrote in message ... Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? -- (\_/) (='.'=) (")_(") Long shot, but maybe a simple delay line, like you used to get in old colour TV's? Gareth |
Tracks to nowhere?
"Gareth Magennis" wrote in message ... "Mike Tomlinson" wrote in message ... Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? -- (\_/) (='.'=) (")_(") Long shot, but maybe a simple delay line, like you used to get in old colour TV's? Gareth Don't reckon you'd get much delay down a length of track like that, would you ? And it seems to be open circuit at the end, anyway. The PAL delay lines were a glass block with two transducers (lead zirconate titinate ??) bonded to a pair of faces at a precision-cut angle. Early ones were a large block with a single out / reflected path. Later ones were much smaller, and the signal bounced around several times before exiting. Total delay, about 64uS or one UK line period. Luminance delay lines to compensate for the difference in bandwidth and hence signal transmission speed between the luminance and chrominance amplifiers, were only a few tens on nS I seem to recall, and were made from very fine wire wound on a hollow glass rod. Could those tracks that we're looking at on the photo be any kind of RFID receiver or responder antennas for automatic inventory or production line process control purposes ? Arfa |
Tracks to nowhere?
On 15/12/2012 13:59, Arfa Daily wrote:
Don't reckon you'd get much delay down a length of track like that, would you ? I've seen delay lines on tracks - funny zigzag patterns - but these were in logic analysers, and were designed to keep the tracks from all the probes the same length. Andy |
Tracks to nowhere?
En el artículo , Andy
Champ escribió: I've seen delay lines on tracks - funny zigzag patterns - but these were in logic analysers, and were designed to keep the tracks from all the probes the same length. Yes, I've seen similar things on PC motherboards, where it's important to keep the tracks between the CPU/memory controller and the memory slots the same length. That isn't what the OP photo shows, though. I certainly agree with those that think it's an antenna of some kind. Figuring out what "SIM1 and "SIM2" mean might be a clue. -- (\_/) (='.'=) (")_(") |
Tracks to nowhere?
In article , Mike Tomlinson
scribeth thus En el artículo , Andy Champ escribió: I've seen delay lines on tracks - funny zigzag patterns - but these were in logic analysers, and were designed to keep the tracks from all the probes the same length. Yes, I've seen similar things on PC motherboards, where it's important to keep the tracks between the CPU/memory controller and the memory slots the same length. That isn't what the OP photo shows, though. I certainly agree with those that think it's an antenna of some kind. Figuring out what "SIM1 and "SIM2" mean might be a clue. Well is the just simply a PC motherboard?. If so then very unlikely thats a anything to do with SIM cards, it prolly means something completely different;!. It might be that the designer thought it looked nice, and it broke up a bit of the board that had no copper tracks on;)... -- Tony Sayer |
Tracks to nowhere?
On 16/12/2012 10:16, tony sayer wrote:
In article , Mike Tomlinson scribeth thus En el artículo , Andy Champ escribió: I've seen delay lines on tracks - funny zigzag patterns - but these were in logic analysers, and were designed to keep the tracks from all the probes the same length. Yes, I've seen similar things on PC motherboards, where it's important to keep the tracks between the CPU/memory controller and the memory slots the same length. That isn't what the OP photo shows, though. I certainly agree with those that think it's an antenna of some kind. Figuring out what "SIM1 and "SIM2" mean might be a clue. Well is the just simply a PC motherboard?. If so then very unlikely thats a anything to do with SIM cards, it prolly means something completely different;!. It might be that the designer thought it looked nice, and it broke up a bit of the board that had no copper tracks on;)... MSI Z68A-G43(G3) desktop motherboard http://www.techiehq.net/pc-hardware/...ard-87549.html -- Rod |
Tracks to nowhere?
On 16/12/2012 10:16, tony sayer wrote:
If so then very unlikely thats a anything to do with SIM cards, it prolly means something completely different;!. It might be that the designer thought it looked nice, and it broke up a bit of the board that had no copper tracks on;)... We did some boards where the vias were no bigger than the tracks so a track that apparently ended actually went through. It doesn't look like that here though as the other vias are quite big. |
Tracks to nowhere?
"Mike Tomlinson" wrote in message ... En el artículo , Andy Champ escribió: I've seen delay lines on tracks - funny zigzag patterns - but these were in logic analysers, and were designed to keep the tracks from all the probes the same length. Yes, I've seen similar things on PC motherboards, where it's important to keep the tracks between the CPU/memory controller and the memory slots the same length. That isn't what the OP photo shows, though. I certainly agree with those that think it's an antenna of some kind. Figuring out what "SIM1 and "SIM2" mean might be a clue. -- (\_/) (='.'=) (")_(") If its a multilayer board, there might be unseen tracks or planes between the top and bottom wiggly traces, connected to the other 3 contact points. Gareth. |
Tracks to nowhere?
On Dec 13, 6:41*am, Mike Tomlinson wrote:
Posted in another group: http://imageshack.us/photo/my-images...tonowhere.jpg/ what are these tracks for? -- *(\_/) (='.'=) (")_(") After downloading your image, copying, and overlaying it seems that the two patterns do NOT lie on top each other, rather form small loops. *IF* there is a gnd plane between, doesn't matter if they overlay or not. They do appear to be the same length of run and do appear to have a 'guard trace' along each side. But either the vias are super tiny which doesn't appear to be the case since vias can be seen in adjacent areas, or those guard traces are floating. The two sets of pads, SIM1 and SIM2, look like either simply mechanical access points. If you took an instrument like a network analyzer with small pointy tips, it looks possible to touch SIM1 & SIM2 from either side; which would allow you to measure the transmission line characteristics of both the outside layer processes and check/control the PCB manufacturing. That's my vote. Although we've always laid the test traces nearer to the outside, unused areas of the PCB and therefore the traces were straight. Just as a note, the vias in that adjacent area look VERY close together which would cause the power/GND planes to have large holes cut into them rather than a series of small holes. -- Usually considered not good for signal integrity AND especially EMC issues. Did anybody find out what that chip, ASMEDIA ASM1083 does? |
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