Archive for the ‘RF and Video’ Category
RF Attenuator Pads
This is Attenuator Pads circuit. This circuit can be used when testing wireless network links to help simulate real life signal loss. This circuit can handle DC – 18 GHz, 2 watts of power, and have built in SMA connectors. The attenuator pads can be combined to increase the overall attenuation. a long length of …[Read More]
Cable Reflection Tester
This is a Cable Reflection Tester circuit. This circuit can be used to check coax cable runs for shorts or even impedance mismatches. This circuit will send a pulse down the circuit, then the return signal can be checked on an oscilloscope. The distance can be determined by using this equation:distance = time x speed …[Read More]
This circuit diagram shows us about simple SWR which is built using readily available parts. Take a note that to ensure accurate power reading, no attempt has been made . If we want a circuit that would fit in a small enclosure, and give an indication of minimum SWR, this circuit does the trick. The …[Read More]
Simple Wideband SWR Meter
This is a circuit of Wideband SWR Meter. This circuit is used as a test instrument. To use this circuit, connect the meter, take the necessary readings, then disconnect. The meter should not be left in the line permanently because it draws up 3/4 of the transmitted power, and a similar part of a received …[Read More]
RF AGC with Digital Control
The AGC is used in many system especially communications. This AGC works at 50Mhz, and the output voltage is set by a digital signal that is needed by Self-calibrating systems such as automatic test equipment which requires the high frequency response. During calibration, the AGC output voltage will be calculated by test equipment to get …[Read More]
Digitally Controlled High Frequency VGA
Variable-gain amplifiers (VGAs) can be used in may types of systems, such as radio receivers. In this system, the input signal voltage depends on an uncontrolled variable, such as distance to the transmitter. To ensure that the input signal amplitude matches the input voltage range of key components, such as ADCs and DACs, thereby maximizing …[Read More]
VHF (100-450 MHz) 250W Power Amplifier
Two octave wideband amplifier (covering both the civil and military airbands between 100 and 450 MHz), equipped with two MOSFET devices, which is capable of generating 250 W of output power are given on this design procedures and measurement results report. One of the two octave wideband amplifier has to use the device s with …[Read More]
| 
