You can buy range extenders that work with the wireless router. Bestbuy has some belkin, d-link, netgear and some linksys ones. What I meant was something free. I've heard things like putting a pringles can over the antenna will increase the range. Is that true? If not, are there other things like that that would work? I have tried using cans as improvised "cantennas" over my wireless router's dipole antennas. The signal results were worse than without the cans. A cantenna must be built to the correct dimensions to provide any signal gain, and it replaces the entire antenna. An almost-free solution is to build a parabolic reflector for each of your transmitter's antennas, directing the signal only where it's needed. See http://www.freeantennas.com/projects/template/ The only materials needed are glue, tape, aluminum foil, and light cardstock (a file folder will do). Since the cardstock is "invisible" to your wifi devices, you can tape the left & right edges of the foil to the outside (convex side) of the reflector. When the reflector is bent into a parabola, having the foil on the outside will pull the foil smooth rather than crumpling it. Here's one I designed for specific antennas: http://126.96.36.199/geocorona/index.html A true parabola with the antenna in the correct focal point will precisely direct the radio signals from your wireless device (eg, laptop) to the antenna, and vice versa. A simple reflector such as a can or arbitrarily shaped foil will sometimes cause more interference than signal gain. For those with a Linux-based Linksys router, third-party firmware is available that will allow a capable Linux user to electronically boost the signal strength of the router, but this will not increase the router's ability to receive signals from the client devices it serves. A bi-directional amplifier for the 2.4 GHz frequencies is required to get a signal boost both ways. These amplifiers usually cost as much as the wireless router they boost.
No. There's an iPad WiFi and an iPad WiFi + Cellular. The iPad WiFi will only be able to access the internet when you're within range of a WiFi network. The iPad WiFi + Cellular is able to access the internet within range of WiFi and on a 3G network. To access the 3G network you will however have to use an active simcard.
One should have a standard certified temperature calibrator system before attempting to calibrate a temp. transmitter. I believe you want to calibrate the temperature sensor connected to a transmitter and to an indicator. There are three things in all. Temp. sensor it could be RTD or TC. Temp transmitter which transmits the sensor input to the indicator on which one can read the temperature. All three can be calibrated separately or together. If together it can be called loop check. Now to calibrate the transmitter know the range the transmitter and the output signal it is designed for. Say it is designed for 4-20 mAmp signal output and the range is 50'C to 200'C. It means the transmitter is supposed to give 4 ma output when it is measuring 50 'C and 20 ma when it is measuring 200 'C and be liner through out the range. Connect the transmitter to standard 4-20 ma meter. connect the standard resistance equivalent of 50'C in steps of 50'C. Measure the map signal with each step of 50'C equivalent of resistance connected. with increase in step the mamp must increase correspondingly linearly upto 200'C on the meter. Repeat the same in decreasing order in steps from 200'c to 50'C and measure the mamp. Adjust the potentiometer if any on the transmitter in case of deviation. Let the transmitter be with in its defined permissible error range while adjusting the transmitter
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