Your total milliamp range is 4 to 20 milliamps. 4 Ma being 0mmH2o and 20 Ma being 2500mmH2o. So 1250mmH2o is 50% which is equivalent to 12Ma signal.
I think your are asking about the working principle of a pneumatic transmitter. (not transmeter) A pneumatic transmitter measures liquds or air temperatures over a given range-usually a 200 degree temperature range. The range, selected for its purpose could be -40 to +160 or 0 to 200 -as in the case of Honeywell or even 100 deg. ranges, as in the case of say-Johnson Controls. (0-100) Aside from temperature range, the other important criteria is the output of the transmitter. In the case of commercial controls, the correlation of 200 degree temperatures (which is 201 values, not 200) occurs over a pressure span/output of 3 to 15 pounds.(13 values) For example, in the case of a 200 degree transmitter of say 0 to 200 degrees, the zero temperature value output equates to a 3 psi signal. At 200 degrees, the top of the range, the transmitter would output a 15 psi signal. In other words every degree change up from zero degrees would account for a pressure increase (rounded)of .064 psi. (13 pounds divided by 201 degrees)=.0646766) Pneumatic transmitters are typically direct acting and are one-pipe constant bleed devices. Their working principle involves movement of a flapper a given distance in direct response to the sensed temperature acting upon it. As the temperature rises, the bleed port positions itself toward a closed position which allows less air to escape to atmosphere. Less air to atmosphere dictates more air building up in the air line. This value is then transmitted/measured by the controller-which is pneumatically attached to the transmitter.
There are 3 stages of an FM transmitter which allow you to transmit information over the FM band. These 3 stages need to be integrated into a single circuit to form what is known as a 3 stage FM transmitterA modulator circuit to add the information to be transmitted to the carrier wave produced by the oscillator. This is done by varying some aspect of the carrier wave. The information is provided to the transmitter either in the form of an audio signal, which represents sound, a video signal, or for data in the form of a binary digital signal. In an FM (frequency modulation) transmitter the frequency of the carrier is varied by the audio signal.Many other types of modulation are also used. In large transmitters the oscillator and modulator together are often referred to as the exciter. An RF power amplifier to increase the power of the signal, to increase the range of the radio waves.An impedance matching (antenna tuner) circuit to match the impedance of the transmitter to the impedance of the antenna (or the transmission line to the antenna), to transfer power efficiently to the antenna. If these impedances are not equal, it causes a condition called standing waves, in which the power is reflected back from the antenna toward the transmitter, wasting power and sometimes overheating the transmitter.
Dp= rho * g * Dh Dp = differential pressure between point 1 and point 2 [Pa] rho = density of the liquid [kg/m3] g = gravity accelaration [m/s2] Dh= height from point 1 to point 2 [m] For typical everyday sizes of rho and Dh, it can be easily seen than Dp is in the range of 1 to 50 kPa (10 to 500 mabr)
Basically it is a push to talk service.Where one can talk only(transmitter) and other are listen(receiver).When any one push the button then he only can talk.The range of this type of communication is 200-500 meter.Frequency range is 400-2700MHz. Frequency Range (UHF): - Channel 1, 400-420MHz - Channel 2, 430-450MHz ... Communication Range: 5KM+ .Push-to-talk cellular calls are half-duplex communications .Written by Kapil Sadhu.
To create a device such as this one would chose a freguency is of a clear band width (avoid the upper frequency FM range) and mke the transmitter sufficiently weak that the signal would practically fade out in 3 meters. It is also possible to check the signal strength on the receiving circuit though this is prbably more sophisticated then need be as if you sufficiently under power, via gues nd check you should obtain the desired range.
This is a number that indicates what range the transmitter will work correctly. This will depend on how strong the transmitter is.
depends on frequency and power
BY Product Specification
There is not a cable that can extend the range of a wireless mouse.
As FM is transmitted using VHF, the transmitting range is more a matter of Line of Sight than transmitter power as these frequencies only follow straight lines.
Disables enemies radars within the range of the transmitter.
From 88.5 to 107.9 MHz
narrowband
narrowband
we can create transmitter by using modulator circuit depending what frequency range you would like to use if you want to use FM range 88 to 108 MHz than you may refer to FM modulators and if you are going to more than 300MHz than you will need RF receiver.
USB radio transmitters usually transmit within the equivalent range of about 2 city blocks. Some higher end models transmit at a higher range than others.
Depends on the transmitter power. Most hobby planes have a reception up to about 500 feet.