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Shopping Cart Terk Wireless A/V Transmitter/Receiver Model 30LF2
From Matthew Torres,
Your Guide to TV / Video.
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Guide Rating

The LF30S is a versatile device that connects easily to any consumer electronics component via coaxial or composite connectors. Everything needed comes in the box – transmitter, receiver, IR extender, power adapters and cables. The LF30S is designed to transmit a signal up to 150 feet. The signal range is probably only met if the transmitter and receiver are in the 'line of sight' of each other meaning no obstacles blocking the signal path.
Installation and IR Extender
The LF30S is easy to setup, especially since the transmitter and receiver are clearly labeled. To begin, connect the transmitter to the device that will produce the audio/video (DVD player, satellite receiver, MP3 player) signal. Connect the receiver to the device you will watch or listen to the transmitted signal on. Turn on the transmitter and receiver.
One nice feature with the LF30S was the IR extender, which allows for operation of a device, like DVD player or satellite receiver, from another room. The IR extender plugs into the transmitter and comes with a sensor that sticks to the transmitting device’s remote control sensor. This is a convenient feature because operation of a device from another room just makes sense for this type of device.

Because of the IR extender, I could operate the DVD player in my living room with the remote control while watching it in my bedroom. I didn’t have any problems with the remote control operation. It was as though the device was in the same room as the remote control. The key is to locate the remote control sensor, and place the IR extender on it.

Transmitting and Receiving Signals
While I didn’t have room to test the 150' range, I was able to receive a good signal from over 60' away with a series of walls in between the transmitter and receiver. Essentially, the signal went from one end of the house to the other.
I used the LF30S to transmit video/audio from a DVD player, satellite receiver and digital camcorder. I was concerned that picture/audio quality would be sacrificed by sending the signal through the open air. However, any concerns were quashed because the picture and audio were just as good as if played without the LF30S.

I didn’t get much disturbance in normal use of the LF30S. When transmitting the signal around corners without adjusting the reception, the picture was slightly scrambled and the audio had a light buzz. However, most disturbances were easily corrected by adjusting the antennas on the transmitter and receiver. Antenna adjustment was easy, but might require two people – one to adjust the transmitting antenna, the other to offer feedback when an acceptable signal is acquired.

The only time I didn’t get any signal disturbance without adjusting the antennas was when the transmitter and receiver were in the ‘line of sight’ of each other.

Downside Issues To Address
There was a downside to the LF30S. While the receiver connected to a device via coaxial and composite, the transmitter only connected by way of composite.
Since the unit operates on the 2.4 GHz frequency, it will conflict with many cordless telephones (not cell phones). During the product test, I was not able to get a dial tone on my cordless phone while the LF30S was turned on. I did receive incoming calls, but could not answer them on the cordless phone because of the interference. This is something to seriously consider. If the LF30S is only turned on when in use, the conflict with cordless phones would be minimal.

Also, I had some problems with the reception, especially when moving around the receiver. The disturbance was minimal and ended when the movement ceased.

Another glitch was with the audio. At times, it was difficult to get rid of the low buzz on the sound. The noise wasn’t overpowering, but could be annoying to some people if not corrected by adjusting the antennas.

Conclusion
Overall, I was impressed with the LF30S. I can see how this device would come in handy for those wanting to watch television or listen to music in a place that isn’t equipped to do so otherwise, like in a garage, by a pool or in a room not wired for cable/satellite. Other uses could be listening to satellite radio in the front yard, running computer audio to a stereo on the other side of the house or sending a signal from a camera to a monitor, like for weddings, parties or security issues.
The bottom line is that this product works as good, if not better, than I expected.

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broadcastmicrowaveservices.com Peter's electronic projects
Infra/radio remote control transmitter/receiver with PIC
v4.2 designed by Peter JAKAB in 20042005
old version in December, 1999

NOTE for beginners: PICs are general purpose microcontrollers which have to be programmed before you can use them in the actual circuit! Check out this link to learn more.

If you are looking for walkietalkie or RF circuits, please check here (this page has nothing to do with walkietalkie circuits).

RF transmitter, builtin antenna
same RF transmitter with external antenna

RF receiver, 4 channels
same receiver PCB with IR module

description
This is a general purpose remote control project with using programmable PIC microcontrollers. Schematics are shown for using infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Wellknown such ICs are Holtek HT12D, HT12E and Motorola MC145026, MC145027, MC145028.

Remote controls usually consist of encoder/decoder parts connected to a transmitter/receiver module which takes care of the transmission of digital signals by radio or infra waves. The format of this project's signal is designed to be ideal even for the cheapest ASK RF modules (using 50% signal/silence ratio), and it is similar to the Philips RC5 format used in infrared remote controls. The transmitter has a varying number of buttons and sends the states of these inputs to the receiver. The receiver device decodes the message and sets the outputs accordingly.

general schematic for remote controls

encoder methods
There are two different methods for encoding/decoding channel information:

for remote control this page is about remote control. The information about which key is pressed is encoded and sent.
You can press at most one key at a time on the encoder, and only the code for the pressed key is sent to the decoder. This is an efficient method for general remote control

parallel channels please see older codecs for such designs. The state of all inputs are encoded and sent.
The input to the encoder is the state of buttons or TTL inputs. Every input channel state is encoded into each message sent to the decoder (one bit per channel), so TTL inputs can change asynchronously, and any number and combination of buttons can be pressed and encoded, the same state is reproduced on the decoder outputs. This method is suitable for modeling AND remote control, but messages are longer. Analog channels would also be possible, but are not yet implemented

remote control
Current devices have 4 or 8 channels it means they are capable of controlling the state of 4 or 8 switched outputs. Each transmitter and receiver has an address, and the transmitter address must match the address of the receiver to control the channels. The transmitters are capable of sending three different types of codes for the available channels:

transmitting simple code indicating that the button for a channel is pressed it can be used for momentary or toggled channel outputs
transmitting channel ON codes it is used for turning on latched channel outputs
transmitting channel OFF codes used for turning off latched channel outputs
All the receivers have an indicator LED showing that a valid packet was received. Receivers can have different type outputs for each channel:

momentary output the channel output is turned ON while the corresponding transmitter button is pressed
latched output the last received state is kept. The channel output can be toggled on/off by a momentary button press, or the output can be turned on or off by specific ON/OFFtype transmitter codes
Combining different codetype transmitters with receivers with different type channels, great versatility is achieved. The possible combinations are described below. transmitter channel type code receiver channel type resulting behaviour
simple code momentary the channel output is turned ON while the corresponding transmitter button is pressed, and turned OFF when the button is released

simple code latched the channel output state is toggled each time its button is pressed: when the corresponding transmitter button is pressed, the output is turned on. By pressing the same button again, the channel output is turned off
channel ON latched the channel output is turned on when the corresponding transmitter button is pressed
channel OFF latched the channel output is turned off when the corresponding transmitter button is pressed

Current choice of devices:

name channels and types addresses source code

4channel RF/IR transmitter 4 channels, 8 buttons each channel has 2 buttons: ON and OFF (for latched receiver operation)
16 (4bit) 4ch RF
4ch IR

8channel RF/IR transmitter 8 channels, 8 buttons (for toggle or momentary receiver operation) 16 (4bit) 8ch RF
8ch IR
8channel RF/IR receiver 8 channels: each channel can be latched or momentary 16 (4bit) 8ch RF
8ch IR
4channel RF/IR receiver 4 channels: each channel has both momentary AND latched outputs (2 outputs per channel) 16 (4bit) 4ch RF
4ch IR

4/8channel V4.2 RF transmitter
The transmitter has 8 buttons. The 8channel transmitter can be used for controlling 8 channels by sending simple codes, the 4channel transmitter can be used with four ON and four OFF buttons for 4 channels. The diode wires (J1J4) determine the transmitter address. The number of channels (and button functions) depends on the PIC code used.

RF transmitter schematic

4/8channel V4.2 IR transmitter
The transmitter has 8 buttons. The 8channel transmitter can be used for controlling 8 channels by sending simple codes, the 4channel transmitter can be used with four ON and four OFF buttons for 4 channels. The diode wires (J1J4) determine the transmitter address. The number of channels (and button functions) depends on the PIC code used.
IR transmitter schematic

8channel V4.2 IR/RF receiver
The receiver has 8 relayswitched NO/NC outputs for 8 channels. Each channel can be set to momentary or latched operation. The address is set by switch S1. The schematic shows the RF version of the receiver, the IR version differs only in the receiver module a 3pin IR receiver IC, like TSOP1738 is used Nady Encore I Receiver Package with Bodypack Transmitter
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Sony TRANSMITTER AND RECEIVER
Sony TRANSMITTER AND RECEIVER part number 155060612 or 155060612 Compatible with:Radio,transmitter,receiver circuits

Electronic circuits:

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Transmitter & Receiver

Architectures

By Andrew Bateman

Transmitter & Receiver Architectures:

Basic Building Blocks

Frequency Source (Carrier)
In order to make the information signal (e.g. data) pass through the air, it must be modulated on to a carrier signal whose frequency is well suited to the propagation environment, conforms to the licensed operating bands, and is sufficiently stable to allow detection by a tuned receiver in the presence of interference.

Modulation
The method of imposing the information signal onto the carrier signal is termed modulation and must be accomplished cost effectively and accurately for maximum range and minimum interference.

Amplification
The amplifier is a key part of the transceiver, and must be efficient (dc power in to RF power out), low cost, nonpolluting, and possibly linear. Output power is dictated by regulation, range requirement, battery life, cost and linearity considerations.

Antenna
The antenna is often the most poorly engineered part of a radio system. Good design will ensure maximum range, high amplifier efficiency (good matching), good selectivity, minimal pollution, good interference rejection, good sensitivity, reduced design headaches.

Reception
Key to the sensitivity, dynamic range and strong signal handling properties of the radio is the receiver ‘front end’. The main task is to boost weak wanted signals, often in the presence of strong unwanted signals whilst introducing minimal noise and distortion. In many cases, some selective filtering is required to assist this task.

Demodulation
The process of removing the information signal from the carrier is termed demodulation. The challenge is to design a circuit (or algorithm) that will achieve this task optimally in the presence of noise, interference and varying signal strength, frequency and phase, whilst being compact, power efficient and cheap.
Part Total Qty. Description Substitutions
C1, C2 2 0.1uf Ceramic Disc Capacitor
C3 1 100uf 25V Electrolytic Capacitor
R1 1 100K Ohm 1/4W Resistor
R2 1 1M Ohm 1/4W Resistor
R3 1 10K Pot
Q1 1 NPN Phototransistor
U1 1 741 Op Amp
U2 1 LM386 Audio Amp
SPKR1 1 8 Ohm Speaker
T1 1 8 Ohm:2K Audio Transformer
MISC 1 Wire, Board, Knob For R3, LASER Tube and Power Supply

In the transmitter schematic, no ballast resistor is shown because most small LASER power supplies already have one built in. Yours may differ, and a resistor may be needed.

The receiver should be kept away from bright lights. You may want to put a piece of wax paper in front of Q1 to keep the LASER from swamping it.

In order to get any decent amount of modulation, you may need to drive T1 with more then a watt.

The circuit can be made to transmit computer data with the use of two modem chips.
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Range up to 10Km
Frequencies available: 458MHz (various channels)
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