Questions tagged [transceiver]

For questions about devices that are both transmitters and receivers.

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3
votes
1answer
207 views

Can an unpowered 2.4 GHz transceiver exist?

I just read an internal presentation from the company I work for announcing the release of a small consumer device with an embedded RFID tag and 2.4 GHz transceiver. The presentation made note of the ...
0
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2answers
3k views

What does blocking performance mean in RF transceivers' datasheet?

I have encountered two terms, adjacent channel selectivity (ACS) and blocking performance (BP), in TI cc1120's datasheet (http://www.ti.com/product/cc1120). I found the definition of the former (ACS) ...
6
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1answer
797 views

Why are the USB signal pins always swapped on USB bridges?

So I've been looking around for quite some time for a USB<->UART transceiver that has the pins properly ordered. If you'll look at the picture here, you can see that the pin order of the connector ...
5
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2answers
5k views

Multiplexing a CAN bus

I want to use a small 8 bit microcontroller which has only a single CAN rx/tx, i.e. Atmel 32c1, but in my application I need to be able to send and receive requests from two CAN buses. I have read ...
0
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1answer
170 views

How to listen to radio communications from a transmitter?

I have two devices communicating at a frequency which I don't know. I want to listen to that communication so that I can replicate one of the devices and fool the other. Basically I want to reverse ...
2
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2answers
633 views

Measuring the distance between two points electrically

I am trying to build a real time location system(RTLS). I have a arena of 10 x 10 meters in dimension. And would like to track the position of the object moving in the arena with a precision of within ...
3
votes
2answers
653 views

Interfacing tri-state logic across 3v3/5v. Do buffers mirror all three logic states?

(This is just learning/hobby stuff...) I have a 5v (tri-state TTL, ZX Spectrum) bus and I want to interface some non-5v tolerant 3v3 chips to it. I think I need buffers or transceivers for the level ...
2
votes
2answers
605 views

Shared antenna on multiple 2.4Ghz receivers

I want to use several 2.4 Ghz transcievers (not sure which IC yet, either Atmel AT86RF*** or TI CC) in order to build a simultaneous multi-channel sniffer. The transciever output is differential. I am ...
1
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1answer
261 views

IC SN74HCT245 Transceiver

SN74HCT245 is a OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS. But i am not getting why we need it? It basically transfers signal from port A to B or vice versa or isolate it. Where we use it? Is it ...
0
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1answer
406 views

Helical wire antenna normal mode or axis mode?

I have bought theses two RF-transceiver CC1101 module from e-bay(image below), and I want to know if it is a helical antenna in normal mode or in an axis mode. The specification doesn't say anything ...
1
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0answers
197 views

How to determine a Signal Generator's Marker (Event) output delay?

I am using an Agilent N5182B Signal Generator for modulating a 2-FSK waveform on a 160MHz RF carrier. For that, I am using a baseband waveform (I/Q mode), generated by a Matlab FSK modulator script. ...
1
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1answer
269 views

Two different length antennas can cause problems?

I am using two 443 MHz transceivers (FY-605 transceiver) with both having different antenna lengths. One antenna is around 12cm long and the other antenna is around 17cm long. Will this cause problems?...
0
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1answer
108 views

Fiber optics module: built in or plug-in module?

I am designing an Internet of Things system with fiber optics as its transmission medium (for its immunity to various kinds of interference and inability to carry a shock from a failed high voltage ...
10
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1answer
6k views

Transceivers in the field of FPGAs: When and why will we use them?

I am recently getting myself into the field of FPGA design and development, and lately I've found myself hearing a lot about transceivers. I tried searching the net for some answers about these ...
0
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1answer
300 views

Switching a relay through a wireless connection

I want to create a circuit which will wirelessly drive a relay. I only have a little experience with Arduino. I know what peripherals I need, but I don't know what micro-controller to use. I made a ...
1
vote
1answer
1k views

Controller area network voltages

The CAN bus has CAN-High and CAN-Low lines. Normally, in the recessive state the voltages are each 2.5 V and in the dominant state the CAN-High line goes to 3.5 V and the CAN-Low line goes ...
0
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1answer
153 views

Interesting observation on strange behaviour using motors and IR transceiver

I am working on a robot with with the following specs: Two coin type vibration motors rated at 3V for locomotion Motors triggered using two darlington transistors (sample schematic shown below) ...
1
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2answers
136 views

Issues related to Bit-banging transceiver modules

I have two Infrared Transceiver modules from TFDU4101-TR3 on two separate boards each interfaced to ATMega164PA microcontroller. To drive these transceivers an endec is needed which I have not used in ...
0
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1answer
261 views

How to modulate Transceiver module for use with ATmega164PA

I am using a transceiver TFDU4101-TR3 to communicate with another device which has exactly the same transceiver. I bought this thinking I can communicate with the transceiver using my microcontroller ...
1
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1answer
90 views

Controlling various Arduinos with Android

I have an upcoming project which requires me to use about 8 different Arduinos, probably more. They all perform a light show which turns off and on various LEDs at different timings to simulate a "...
1
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2answers
1k views

DIY passive RFID? [closed]

I'm interested in building my own "DIY" RFID scanner and tags. For the scanner, I think I would just need: Transceiver Some kind of hardware polling mechanism to have the scanner scan, say, every 2 ...
0
votes
1answer
64 views

Need some RF help - integrating with a Xemics DP1203 transceiver

So there are some devices (timing photogates) that use these chips (DP1203C915) to send data out over RF at 915MHz to a box that performs timing and split-time calculations. I would like to be able ...
3
votes
2answers
675 views

Can I use this IR Transceiver for communication and obstacle avoidance?

I am building two robots. For communication and obstacle avoidance I am using Infrared. I bought this IR transceiver TFDU4101-TR3 (http://www.farnell.com/datasheets/1675739.pdf)which I thought I could ...
2
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0answers
250 views

Interpreting Data Sheets ("Typical Applications")

I've recently been researching various transceivers, but I run into trouble as soon as I get to the "typical applications" section of the data sheet. With the Si4464 for instance, the example ...
9
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2answers
872 views

How does frequency affect the ability to traverse objects in RF transmissions?

Or perhaps, what are the best bands/modulations to choose from if I need to efficiently transmit data in a path with heavy metal obstacles? I need to build a number of devices to periodically ...
4
votes
1answer
451 views

Wireless NRF24L01 chip compatibility

I have ordered a set of transceiver with NRF24L01 from various vendors. (with and without external antenna) http://www.ebay.com/itm/NRF24L01-PA-LNA-SMA-Antenna-Wireless-Transceiver-communication-...
0
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1answer
2k views

Bluetooth Headset to Bluetooth Transceiver

I have a little bit of experience with Bluetooth and Arduinos but I was wondering if anyone might be able to tell me if it is possible for a Bluetooth headset to be linked to a Bluetooth transceiver ...
0
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2answers
107 views

Do you really need all of the sigals for a general RS-232 port?

I know that having TX, RX, GND, RTS, CTS are good. What about all of the others? Do devices these days even make use of the other pins (DSR, RI, DCD, DTR)? Is it safe to generally leave out these pins?...
1
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1answer
9k views

Problem with nRF24L01 2.4GHz radio/wireless transceivers

I want to control my car with nRF24L01 2.4GHz Radio/Wireless Transceivers. I am using an Arduino Mega, Arduino UNO, joystick, LED and two nRF24L01 2.4GHz radio/wireless transceivers. Here the Arduino ...
2
votes
1answer
347 views

Radio antenna isolating transformer

I need to isolate galvanically my antenna from my RF transceiver. For this I have been recommended a transformer, I select a 1:1 transformer operating in high frequency range. Is it enough to wire it ...
4
votes
1answer
4k views

SFP pin requirement

I have a question regarding SFP pin requirements. The SFP pin descriptions can be found in the standard document found here. I'm currently designing a high speed LED transmitter and PIN-TIA receiver ...
2
votes
1answer
164 views

Transceivers - how to select an appropriate antenna?

I was considering purchasing these small transceiver modules but am unsure about sizing the antenna. I recall having read somewhere that the antenna must be in proportion (wavelength/4) to the ...
0
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1answer
97 views

Benefit of higher frequency transceivers?

What would be the benefit of higher frequency transmission? I was browsing through a website looking at some parts and came across two transceivers, one operated in the 434MHz band and the other the ...
2
votes
2answers
548 views

Ultrasonic transducer response to harmonics?

Does anyone know offhand whether an ultrasonic transducer will respond efficiently to harmonics of the fundamental? For example, will a 40kHz transmitter also transmit with reasonable efficiency at (...
2
votes
1answer
1k views

Calculating the voltage generated by an 40KHZ Ultrasonic Tranceiver

In particular, this device: http://www.hexamite.com/hx40str.htm ...
5
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3answers
3k views

How to know (or estimate) the range of a transceiver?

I'm trying to decide between different wireless transceivers, where my main requirement is furthest range for a given frequency band. Is there a way to relate the frequency, data rate, power output, ...
5
votes
2answers
1k views

5 V to 12 V transceiver chip / hardware

I am looking for a way to connect my logic analyzer (an inexpensive Saleae which is intended for 1.8-5V targets) and a couple of other pieces of analysis equipment to a digital source with signals in ...
1
vote
1answer
4k views

What is 1/8 unit load in RS485 communication?

Something I saw is 1/8 unit load. In that document, it states that RS485 will allow up to 256 transceivers on the bus by using 1/8 unit load. My question is, what is 1/8 unit load and how do I use it?
1
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0answers
77 views

How do I locate proper radio initialization procedure in order to send IEEE 802.15.4 frame?

I am using an AT86RF233 radio connected to an MSP 430 micro-controller. I need to write a function similar to line 92 on this page. This function (trx_frame_write) is supposed write a frame for ...
1
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0answers
671 views

Connecting 2 Arduinos with Bluetooth

I have been looking on Google for a project that involves 2 Arduinos communicating with Bluetooth. The only examples I can find are with an Arduino to an Android phone. Does anyone have links to let ...
0
votes
1answer
344 views

What does schematic of a transceiver equalizer and transceiver preemphasis circuit look like

I have been reading about transceiver basics and was wondering about how 3 circuits look like: Receiver equalizer. Transmitter preemphasis. Clock data recovery. Where can I find a circuit diagram ...
3
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2answers
870 views

Designing a Morse code transmit/receive shoe

Thank you for considering my general question, which I assure you is serious! I want to build -- or have built -- a magnificent shoe that can convert taps (front of the shoe) into Morse code and ...
1
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0answers
475 views

Using same DB9 port for RS232 and RS485 (selectable) - looking for IC

Do any of you know of any transceiver ICs that can switch between RS232 and full or half duplex RS485? I'd like to be able to select which type of communication is used with either a jumper or input ...
3
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2answers
725 views

What is wireless blocking immunity?

In a data sheet for a wireless transceiver I read 100 dB blocking immunity what does this actually mean?
2
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1answer
2k views

Preventing Interference when using RF transmitters and receivers

I want to use a "listen-before-talk" approach to transmit data from sensors connected to a transmitter and receiver pair to a MCU connected to a transmitter and receiver, which means that the sensor ...
0
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2answers
3k views

building a 900Mhz long-range data communications network

First to be clear: I am a licensed amateur radio operator with about 10 years programming experience and I took electronics in high school (2008). However I tend to stay on the soft side of things. I'...
2
votes
1answer
629 views

DMX512 Remote controlled LED

I'm having a problem with this circuit. I am trying to get an LED wash light circuit to be remote controlled via DMX512. The problem is, after I designed the circuit for the RS485 (which will deliver ...
1
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2answers
8k views

Difference between differential line transceiver & differential line driver and receiver pairs

What is the difference between differential line transceiver & differential line driver and receiver pairs ? Line transceiver is used as translator in either unidirectional or bidirectional; ...
4
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1answer
2k views

Options For Controlling an RC Car

My friend and I are trying to design a remote controlled car and one of the aims is for the controller to be a smartphone. The original idea was, have a transmitter plugged into the audio headphone ...
2
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1answer
285 views

Selecting a transceiver module for a wireless communication system [duplicate]

Possible Duplicate: Suggestions for a Point-to-Point reliable Wireless Communication Module I got a project to design a wireless communication system in order to communicate between the factory ...