Lostinspace

Im about to head out to pepperell. Give me a call in about an hour.

>when are we drinking? When the Beer Light goes on! (thank you)

Thank you I'm going skydiving ... -Meow

Happy Birthday Robyn (Did you think I'd forget either ) -Meow

Happy Birthday Egon!

Only the chickies think so... Thank you .

ok...

http://www.ti.com/rfid/docs/customer/faq.shtml 3. What is the write range of a tag? The write range is based upon the type and size of the transponder. It can range between 40 to 80% of the read distance. 4. How can I achieve the optimum read range? Generally, read range increases with size of transponder, size of antenna, the power of the reader, and the absence of noise conditions in the environment. In order to reduce the impact from noise and environmental influence check the following: ))) Computer monitor interference ))) Choice of power supply with reader ))) Antenna tuning ))) Surrounding metals ))) Common Mode noise 1. What can cause a reduction in read distance? There are a number of factors that can influence the reading range of any RFID system. They include the influences of metal, the attenuation caused by the signals passing through different materials, environmental noise and interference. Metal Metal close to an antenna, or a large mass of metal (relative to the antenna size) passing an antenna, can alter the matching of the antenna's characteristics to that of the reader. Re-tuning of the antenna in-situ normally reduces this problem. Signal Attenuation As the frequency of a tagging system rises, the ability of the radio waves to penetrate different materials decreases. At Tag-it™'s frequency (13.56 MHz) this reduction is much less than at UHF and microwave frequencies. It is not an issue at the LF (134.2 kHz) frequency. Environmental If there is environmental electrical noise (RFI) in the location of the Antenna system, some reduction in the read performance may result. This RFI could be caused by: ))) a. Other transmitters in the location ))) b. Inverters on drives and motors ))) c. Electrical noise generated by moving equipment such as conveyors ))) d. Noise associated with the power supply, especially Switched Mode Power Supplies. Shielding the antenna is often an effective way to reduce or overcome such issues. This has benefits because it not only stops the RFI but it also stops any interference generated by the Reader affecting other equipment. The shield also stops transponders (XP), which are not in the read zone from being read. A shield also allows higher power levels to be used and still keep within the regulatory limits. Antenna systems built around a conveyor belt or a tilt tray sortation system may suffer noise from the following causes: ))) a. If there are metal rollers within the antenna system then these can modulate the signal. In this case you should replace them with plastic rollers. ))) b. Ensure that the conveyor and tilt tray systems are completely grounded (earth bonded). Conveyors and tilt-tray systems are made from metal sections, which are bolted together and use linear motors to drive them. Unfortunately, at the connecting points the metal is painted which does not give a good earth bonding. So ensure that you remove the paint from the metal and earth bond the metal work which passes through the antenna system. How can you reduce the read range? Normally everyone wants maximum read range, but the quickest way to achieve a reduced range is to turn the RF power down. Having done this, you must check that you have not created any read holes. 3. What is the maximum Read-range? There is no single answer to this question as it depends on: ))) 1. Reader antenna size ))) 2. Tag antenna(s) size ))) 3. Reader RF power (legal limitations) ))) 4. Environmental noise ))) 5. Reading mode With the large inlay (RI-I12-110A-00) you can achieve over 1 meter (40 inches) with opposing antennas. As a conservative rule, for a single antenna, the reading distance will be around the same as the smallest dimension, so a 400mm x 500mm antenna will be capable of reading 400mm. Readings from a single large antenna of much greater than 800mm, (all conditions optimum) should not be expected. 4. What is the minimum separation between Tags? There is no minimum separation between tags. Using the SID (anti-collision algorithm), multiple tags close to the antenna can be readily identified but if they are at the extreme reading range, they will require some separation (5 cm) to prevent mutual de-tuning. If individual tags are passing an antenna, some separation will need to be maintained if the anti-collision algorithm is not being used. The separation is related to the size of the reading zone and should be sufficient that only one tag is in the field at one time. 7. What is the maximum antenna size? There are 3 limiting factors to be considered: ))) Legislation ))) Matching difficulties ))) Performance degradation Legislation The larger the antenna, the greater the signal strength will be at a distance from the antenna. You have to keep the antenna sizes down, if you wish to operate legally without screening. Matching An antenna is a resonating circuit having resistance, inductance and capacitance. To make the antenna resonate is a balancing act between the inductive and capacitive reactances. As the antenna size increases, the inductance also increases and you can reach a point where matching such antennas become very difficult, as it requires very small values of capacitance to complete the balance. Performance degradation When antennas get too large, the RF field weakens and operations such as anti-collision reading and writing become difficult. Larger antennas also have a worse signal to noise ratio. Once antennas exceed 900mm x 900mm, the performance may decrease. Using inductance-measuring equipment at 13.56 MHz. This is the most accurate but will not be an option for most people because of the cost of the equipment. Using an LCR meter These are relatively inexpensive but as they measure typically at a frequency of 1 kHz, are not as accurate. Calculating the inductance This is the least accurate. Most formulas are based around multiple winding circular antennas but TI's "ADU.exe" program is accurate enough for most rectangular designs. (c) Texas Instruments Incorporated. All rights reserved.

Sangy???? Sangy!!! That is soooooo gay. When I'm a Greenie (very soon, I heard from reliable sources), I will ban you for bad taste in nicknaming. And I will ban him too for letting you call him Sangy! Green wins over Red. Or is it paper over rock? I'm confused now. Someone is walking big with a soft stick....

Oh I so agree about Beth! So while you’re at it, delete her account too. See you on the Front nine Sangy! Ciao, Bella

...[Belinda] Very soon indeed....Nick

... Belinda why aim low?

I went skydiving. Need more?

XY

Why bother ? Becasue I have never done it before, and it might be fun.

Ever distilled your own Vodka?

Sooooo, you are bragging to a forum about being insensitive? Or just lucky?? or not picky

Dude. Sucks for Bill, He's going in the trunk.

Who are you? Uuuummm .... I think I am heading up to Jumptown with Bill.

That's up to Mirage. If the rig shows up friday, Don will pack it.

Understand that I miss my rig or that I am now VERY upset?

-1 very unhappy Skydiver

Has anyone bought a custom Mirage that needed rework upon delivery? Mind sharing your story?

What? No finger? what a jip.