signal crossing

compressor to react fast or slowly to an audio signal crossing the Threshold and also how long the compressor keeps working. A loud acoustic guitar being plucked is a good example. With a fast Attack time the musicians playing will be compressed almost instantly. What if you want to hear that definite click of the plectrum plucking the strings? You set a slower Attack time which allows that plucking noise through before the compressor cuts in to reduce the overall volume. Its like shutting the digital barn door after the horse has bolted. Okay, now you want the compressor to turn itself off again in time to hear the next plectrum pluck. So you want a fast Release time to get that compressor out of the way. Otherwise with a slow Release time the compressor will still be on and effecting the following picking.

Different situations call for other approaches. A fast Attack time will help remove plosives, such as microphone popping. If you get your Attack and Release settings wrong it can create a pumping effect as the compressor struggles against the signal.

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GPS front end RF

Built-in GPS front end RF and base band processing module
GPS Antenna Provided
Local Alphanumeric or Graphics display to display Latitude/Longitude/Altitude and Direction
The above parameters can be transmitted through a RS232 output port
This RS232 output is fed to a local wireless transmitter at 433.0 MHz frequency
The range of coverage is 8-10Kms can be expandable to 15Km.
FSK modulation.
Yagi antenna with 8-10dBm Gain for Transmission.
Log scale fidelity : ±2 dB (without attn.) 500 MHz
input attenuator : 0 to 40 dB (4X10 dB steps)
Max.input level :+10 dBm, ±25V DC(odB attn.) +20 dBm (40 dB attn.)
Tracking generator
Output frequency : 0.15 MHz to 1050 MHz
Output attenuator : 0 to 40 dB (4X10 dB steps)
Output impedance : 50 (BNC)
Output level range : -50 dBm to + 1dBm (in 10 dB steps and var)

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digital communication

We have in store for our clients a quality range of communication trainers, digital communication trainer and analog comminucation trainer etc that has gained appreciation for easy usage and optimum utility. Our range includes analog communication trainers, antenna trainers, mobile trainers and transmission line trainers. These trainers are ideal for conducting varied experiments in the field of telecommunications, electronics and electrical labs.

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EPABX TRAINER

EPABX TRAINER
We are amongst the renowned manufacturers and exporters of trainer kits that are available in various models. Our range comprises instrumentation trainers kits, consumer electronic trainers and bio medical trainers. These find application in telecommunication industry, public utilities and medical sector.


We are engaged in offering quality range of instrumentation trainers kit that has gained appreciation for reliable operations. These include ITK-01 LVDT trainer kit, ITK-02 pressure measurement kit, ITK-10 angular displacement kit and ITK 11 thermistor, AD 590 kit.


We offer Basic Science/ Physics Trainers that are generally used in the experiments of science and physics in educational institutes and universities. It is checked on various parameters such as performance, accuracy in readings and durability. The trainers find application in government agencies, academic institutions and research centers.

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Digital Interface

XGGCOMMS Icom Digital Interface
Description: This interface offers full CAT control of your Icom Transceiver via your PC's RS-232 port and the Radio's 3.5mm CAT (CI-V) Jack . Additionally, the interface connects your PC sound card line in/out jacks to the radio's 8 pin Din accessory socket for full transmit and receive audio interfacing allowing you to operate modes such as PSK-31, WEFAX, SSTV, PACTOR, Packet, AFSK CW and many more.

This interface is compatible with:
IC-275, IC-375, IC-575, IC-707, IC-725, IC-726, IC-728,
IC-729, IC-735, IC-736, IC-737, IC-738, IC-746,
IC-746Pro, IC-756, IC-756Pro2, IC-756Pro3, IC-761,
IC-765, IC-775, IC-775DSP, IC-7400, IC-7700, IC-7800,
IC-781, IC-820, IC-821, IC-910, IC-970.

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CPLD

Modular design and flexibly for CPLD
Signal generation unit:
Programmable frequency generator
Standard frequency: 1 — 10MHz
Logic input switch:
8 x 1 logic input original press point with light
8 x 2 logic input Dip switch
4 impulse press button generator
3 x 4 array keyboard
Output unit:
Logic status monitor with total 102 sets LED indicator
8 x 8 dual color point array LCD display
LCD 16 x 2 monitor
6 digits 7 nodes monitor
3 x 4 LED and 1 set buzzer output
Linear unit:
2 sets 8bit D/A converter
1 set 8bit A/D converter
MPU unit:
08051 and CPLD match circuit test
Power source: 220-240V AC, 50Hz, 1Phase
Standard accessories with printed operation manual

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voltage-controlled oscillator

VCO also has a connection for an external induction coil for use in showing how magnetically induced voltages can vary the audio frequency output. The audio output of the VCO can also be varied between 500 Hz and 5 KHz by means of a potentiometer. To view schematics of the VCO in Adobe Acrobat format click on the links below.

The VCO is powered off of two nine volt batteries connected in series. Circuit common is tapped off of the junction between the two batteries which results in +9VDC and +9VDC supplies for the VCO. The power supplies are regulated to +5VDC and -5VDC supplies that are used by the MAX038 chip. The unregulated +9VDC supply is used by LM386 audio amplifier and LM555 timer chip. The W172DIP-141 reed relay chip also uses the +5VDC supply for its coil voltage.

voltage-controlled oscillator (VCO) is a frequency-varying oscillation circuit that changes its output frequency according to an external voltage. The varying range of the frequency is determined according to its purposes. A typical voltage controlled oscillator (VCO) generates an output signal oscillating at a frequency determined in accordance with a voltage supplied from an external unit. A VCO employs one or more variable capacitors (varactors) to allow for adjustment of the frequency of oscillation for the VCO. Voltage controlled oscillators mainly produce high frequency signals. The frequency of these high frequency signals generally depends upon the capacitive value of a resonant circuit.

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