![physical.pdf](http://s1.studyres.com/store/data/018767210_1-41e2c690df43024a8aa2443db5d41165-300x300.png)
Capacitor Self
... Use the measurement circuit shown in fig.5 and use OpAmp4 on the hps Board as a current voltage converter (with R 10k ). As an unknown admittance use the parallel circuit of a resistor R x (1k R x 10k ) a capacity C x (10 nF Cx 50 nF ). Measure the output signal at 0 (or 180 o . ...
... Use the measurement circuit shown in fig.5 and use OpAmp4 on the hps Board as a current voltage converter (with R 10k ). As an unknown admittance use the parallel circuit of a resistor R x (1k R x 10k ) a capacity C x (10 nF Cx 50 nF ). Measure the output signal at 0 (or 180 o . ...
Flag Antenna Construction
... The previous Kaz and Pennant tests showed 23 dB less sensitivity than the sloper: those antennas had an enclosed area of only about half as much as the area of the Flag. I can use the antenna as a "straight" broadband loop either by setting the Vactrol to minimum resistance or, even better, by remo ...
... The previous Kaz and Pennant tests showed 23 dB less sensitivity than the sloper: those antennas had an enclosed area of only about half as much as the area of the Flag. I can use the antenna as a "straight" broadband loop either by setting the Vactrol to minimum resistance or, even better, by remo ...
Lock-in amplifiers
... Sum and difference freq generated Compare to signal addition -- interference Signal frequency close to reference freq – low freq beat – DC for equal freq sine waves – DC output level depends on relative phase ...
... Sum and difference freq generated Compare to signal addition -- interference Signal frequency close to reference freq – low freq beat – DC for equal freq sine waves – DC output level depends on relative phase ...
Control Units MAGTRONIC Loop Detector MID 2 E - 800
... The hold time can be adjusted with DIPswitch 6. At the completion of hold time it will be displayed "free loop" and the detector calibrates automatically. The hold time starts with the occupation of the loop. A reset with calibration can be effected by changing the hold time setting. ...
... The hold time can be adjusted with DIPswitch 6. At the completion of hold time it will be displayed "free loop" and the detector calibrates automatically. The hold time starts with the occupation of the loop. A reset with calibration can be effected by changing the hold time setting. ...
Circuit Timing
... Maximum: longest possible delay Typical: under near-ideal condition Minimum: smallest. Many manufactures don’t specify this values in most moderate-speed logic families (74LS,74S TTL). Set to zero or 1/4~1/3 of typical delay if not specified. ...
... Maximum: longest possible delay Typical: under near-ideal condition Minimum: smallest. Many manufactures don’t specify this values in most moderate-speed logic families (74LS,74S TTL). Set to zero or 1/4~1/3 of typical delay if not specified. ...
BANDWIDTH OF PCM SIGNALS
... into binary PCM and then converted into a multilevel signal for transmission over the channel. The number of multilevel is 8. Assume that the analog signal has a bandwidth of 2700 Hz and is to be reproduced at the receiver output with an accuracy of 1% (full scale). (a) Determine the minimum bit ra ...
... into binary PCM and then converted into a multilevel signal for transmission over the channel. The number of multilevel is 8. Assume that the analog signal has a bandwidth of 2700 Hz and is to be reproduced at the receiver output with an accuracy of 1% (full scale). (a) Determine the minimum bit ra ...
Chapter 7: Sampling, Digital Devices, and Data Acq.
... Alias Frequency Nyquist frequency: fN = fs/2 = 1/(2δt) This represents a folding point for the aliasing phenomenon. All actual frequency content in the analog signal that is at frequencies above fN will appear as alias frequencies of less than fN; that is, such frequencies will be folded back ...
... Alias Frequency Nyquist frequency: fN = fs/2 = 1/(2δt) This represents a folding point for the aliasing phenomenon. All actual frequency content in the analog signal that is at frequencies above fN will appear as alias frequencies of less than fN; that is, such frequencies will be folded back ...
Connect
... • different ground resistances (milli-ohms) can cause different voltages on ground loops • separate ground wire is better but costlier University of Tehran 15 ...
... • different ground resistances (milli-ohms) can cause different voltages on ground loops • separate ground wire is better but costlier University of Tehran 15 ...
File - telecommunication and networking
... Alternative to coaxial and fiber since require less repeaters and is easy to install but requires line of sight ...
... Alternative to coaxial and fiber since require less repeaters and is easy to install but requires line of sight ...
WEEKLY PROGRESS REPORT Student: Rizal Maulana 102521603
... Figure 1 shows the pinout of the NI-USB 6008. Analog input signal names are listed as single-ended analog input name, AI x, and then differential analog input name, (AI x+/-). Refer to Table 2 for a detailed description of each signal. ...
... Figure 1 shows the pinout of the NI-USB 6008. Analog input signal names are listed as single-ended analog input name, AI x, and then differential analog input name, (AI x+/-). Refer to Table 2 for a detailed description of each signal. ...
How Does Return Current Really Return?
... looks like some positive charge is added to the top conduc50Ω coax cable, 10’ in length. The onetor and some negative charge pushed out from the bottom way time delay is about 15 nsec. If we conductor. From the outside, it looks like current has gone launch a 1 V signal into the line, the curthrough ...
... looks like some positive charge is added to the top conduc50Ω coax cable, 10’ in length. The onetor and some negative charge pushed out from the bottom way time delay is about 15 nsec. If we conductor. From the outside, it looks like current has gone launch a 1 V signal into the line, the curthrough ...
G3A01 What is the sunspot number?
... G4A02 What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver? A. Interference from impulse noise will be eliminated B. More stations can be accommodated within a given signal passband C. It may be possible to reduce or eliminate i ...
... G4A02 What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver? A. Interference from impulse noise will be eliminated B. More stations can be accommodated within a given signal passband C. It may be possible to reduce or eliminate i ...
High-frequency direction finding
![](https://commons.wikimedia.org/wiki/Special:FilePath/HMS_Belfast_-_Huff_Duff.jpg?width=300)
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is the common name for a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can efficiently communicate over long distances; for example, between U-boats and their land-based headquarters. HF/DF was primarily used to catch enemy radios while they transmitted, although it was also used to locate friendly aircraft as a navigation aid. The basic technique remains in use to this day as one of the fundamental disciplines of signals intelligence, although typically incorporated into a larger suite of radio systems and radars instead of being a stand-alone system.Huff-duff used a set of antennas to receive the same signal in slightly different locations or angles, and then used the slight differences in the signal to display the bearing to the transmitter on an oscilloscope display. Earlier systems used a mechanically rotated antenna (or solenoid) and an operator listening for peaks or nulls in the signal, which took considerable time to determine. Huff-duff's speed allowed it to catch fleeting signals, such as those from the U-boat fleet.The system was initially developed by Robert Watson-Watt starting in 1926, although many of the practical elements were not developed until the late 1930s. Huff-duff units were in very high demand, and there was considerable inter-service rivalry involved in their distribution. An early use was by the RAF Fighter Command as part of the Dowding system of interception control, while ground-based units were also widely used to collect information for the Admiralty to locate U-boats. Between 1942 and 1944, smaller units became widely available and were common fixtures on Royal Navy ships. It is estimated huff-duff contributed to 24% of all U-boats sunk during the war.The basic concept is also known by several alternate names, including Cathode-Ray Direction Finding (CRDF), Twin Path DF, and for its inventor, Watson-Watt DF or Adcock/Watson-Watt when the antenna is considered.