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"I and Q are used to modulate a 3.58MHz color subcarrier using two balanced modulator operating in phase quadrature : one modulator is driven by the subcarrier at sine phase ,the other modulator is driven by the subcarrier at cosine phase " My question is how to undertand "balaned modulatro operating in phase (...)
why it is called so...what are the componenets that get eliminated or balanced by means of it.....i found its presence in almost in modualtion sytems....what is its supermacy....
I need to know the difference between two diode balanced modulator and four diodes balanced modulator. where can i find that information?. Book, paper, what ever..
hiya~ I hav a question on this topic regarding the balanced modulator in AM. If the output of the balanced modulator is fed to the input of the second balanced modulator and the carrier is fed to the carrier input of the second modulator, what will the output of the (...)
Hello Everyone! This is my first post so, first a quick intro: I am shoe, Im from edinburgh, 23 years old. So, I'm using a MC149CP balanced modulator chip to build myself a ring modulator on breadboard. Since I am an ultimate noobie and haven't done any electronics since technology in 4th year at school I'd appreciate the help with (...)
I know that balanced modulator removes the carrier frequency from the Amplitude modulated input signal. Here's the circuit that I saw but I couldn't understand its working. I know the working of ring modulator so you need not explain me
Hi there, Currently, i have build the modulator and demodulator as shown in Fig.5 and Fig. 29. The frequency for modulating signal input = 1kHz Carrier frequency = 100kHz. (for both modulator and demodulator) The modulator output (either V+ or V-) is able to get the modulated AM output. (However, i (...)
By definition MC1496 is a balanced modulator and the main application is DSB modulation (Double Side Band – suppressed carrier). If is used as an AM modulator to don’t get carrier suppression (and getting instead, a DSB) you need a shift from suppressed carrier, which your circuit already have it (R5, R6, R10, R11, R9, R12). (...)
This is exactly the system that is used for the transmission of a PAL or NTSC colour sub-carrier for TV transmission. One important factor is that the receiver needs a phase reference signal to decode the QAM. In the TV system, during the period when the picture is inactive (line blanking) a reference colour burst is transmitted that phase locks a
All of these are suppressed carrier AM. There are several ways of removing the carrier but the most common is to use a balanced modulator or a double balanced modulator. These will produce two sidebands (DSB) but you can then fully remove one of then (SSB) or partially remove one (VSB) using filtering techniques. Brian.
This circuit is a (balanced) modulator but not AM modulator. AM modulator is very similar but have 750 resistors around the 50k potentiometer. Check the MC1496 datasheet.
Another attempt to explain the balanced modulator or ring modulator
Circuit 2 is a more or less suitable AM modulator, with the disadvantage that the modulating signal is also appearing at the output. You need to extend the circuit to a double-balanced modulator to suppress the modulating signal. I assume that the shown waveform has been acquired with circuit 2. But to see considerable modulation effect, (...)
to point to the drip rf is a circle like a plop but ssb is a plop plipp { the plipp being the next circle out like mushrooms grow but at the frq in circles at your antenna {dipole} radiation pattern is ssb the plipp of the plop without the plop{the plop is filtered out s
you are all wrong TV signals are a transition of k3F mode or phastidual sideband not therefore AM and only a form of modualted sideband so it a far different mode it is ment for soaking a wide area while not suffering too much from relections and diverse interferance's however if it was am the carrie
Basically the front end of a RF transmitter is composed of an Upconversion Mixers/balanced modulators, Voltage Controlled Oscillator, Bandpass Filters and Power Amplifiers.
A DSB-SC sinal is: φ(t) = f(t) cos ω1t where ω1 is carrier. We want change the frequency of the carrier from ω1 to ω2 (which is known as frequency conversion). Show that the balanced modulator circuit of the picture is needed to do this conversion, injecting f(t).cos ( ω1t ) and A.cos ( ω2 ? ω1 )t a
Hi BigBoss: In order to integrate the VCO and Mixer in obtaining a balanced modulator topology I need to simulate the performance of the integrated block step by step to verify any functionality. Is there any other simulation command, I could use in verifying the functionality of the integrated block of VCO and Mixer. Thanks in advance Rg
can anyone give me gilbertcell calculation spesified V(o) for bjt transistor and double balanced form with thanks
radio IF is 455khz tv IF is 44mhz for ntsc carrier signal is which undergoes changes in amplitude/ phase/ frequency according to the changes in the input modulating signal. it is a high frequency signal which helps to shift the band so as to reduce the antenna size. fundamentally tv signal has horizontal sync, vetical sync, blanking pulses
Hi! Please help me with these questions: 1/With an AM DSB modulation system using balanced modulator,what is suppressed-carrier figure?And how to measure it? 2/With SSB demodulation system using Product Detector,if LO frequency increases,how is the output frequency at USB and at LSB? Thanks!
Model from CM2000 is here: ******************* *MC1496 MCE 1-31-96 *balanced modulator/Demodulator *Nodes: GainAdj Vc Vc Vs Vs Vee Bias Out Out GainAdj *Motorola/MCE balanced modulator/Demod pkg:DIP14 pkg:SO-14 .SUBCKT XMC1496 3 11 10 9 8 7 6 4 5 2 Q1 3 6 14 QNPN Q2 15 9 3 QNPN Q3 4 11 15 QNPN Q4 5 (...)
hi it is stated here that in a QPSK system the highest fundamental frequency present at the data input to the I or the Q balanced modulator is equal to one-fourth of the input data rate how could this be true? although it is stated also that "the bit rate in either the I or the Q
What type of discrete mixer is suited for wideband mixing. I thought about a diode ring or a MOS switch. I dont have access to integrated mixers like Mini circuits and similar. I read about the performance of the single and double balanced modulator and built a double balanced mixer. The main problem was the transformer was not perfectly (...)
Use MC1496 : balanced modulators/Demodulators These devices were designed for use where the output voltage is a product of an input voltage (signal) and a switching function (carrier). Typical applications include suppressed carrier and amplitude modulation, synchronous detection, FM detection, phase detection, and chopper (...)
A balanced modulator or multiplier can be used to double the frequency. Another way is generate a lot of harmonics, and use resonant circuit (or filter) to obtain desired frequency which is integer multiple of the input. S. H.
For a mixer for the LO and the RF circuits for a superhet receiver to generate the IF, can you use a ring modulator or some form of diode balanced modulator, or does it always have to be an active mixer, like with a transister? George KB1PDK
hello I need a varactor diode that achieves about 20pF at -4V bias (minus 4V) to use it in a HF balanced modulator. Any suggestions?
I thought I might have an old data book with it in but I cannot find one. It might have been a double balanced modulator (mixer). I think it had biasing circuitry built in so needed fewer external components than the MC1496. Keith
Hello I have a tube ssb balanced modulator and I am trying to figure out which type of ssb filter to use for 455khz. mecanical, quartz or ceramic? Originally it used a mechanical one. What are the differences related to unwanted frequency rejection anyway?
Hello, I am trying to make a vacuum tube ssb modulator and I need to know if my consideration below is ok. LOSC: 454KHz AUDIO: 1KHz RF FILTER: 455KHz After the balanced modulator 3 frequencies occur: 454KHz (suppressed carrier), 453KHz (LSB) and 455KHz (USB). The 455KHZ filter keeps only the 455KHz USB one and rejects by an ammount (...)
hello, I consider this phasing ssb exciter schematic (there is an error in the phasing network and in the divider circuit the frequency is not right but let's ignore this) I do not know why this has all four phases connected to the balanced modulat
Hi, I'm looking at the AD630 for a demodulation application @ ~1MHz carrier, 1kHz signal. However, its very expensive and pretty large: Does anyone know of any other similar synchronous demodulation chips which might be suitable, and can give a DC output?
Does anyone know a good supplier for general purpose hobby radio ICs like mixers, LNAs, modulators, etc.? Maybe a supplier for amateur radio hobbiests? Digikey and others only seem to sell the specialty stuff. Specifically I'm wanting to build a circuit that will downconvert a narrow-band signal from 3MHz - 30MHz to a few tens of kilohertz (say
A balanced modulator has no carrier at the output, this is not what we want with an AM transmitter. The simplest modulator that is suitable for an AM transmission is a high level modulator. This is where the modulator alters the current flowing in the RF power output device. Its disadvantage is that it (...)
Hello, we are learning about single balanced and double balanced modulators. Apparently single balanced modulators include an information, upper and lower sideband component while double balanced modulators use only the upper and lower sideband components. Can someone (...)
You are quite correct, a BFO is just an oscillator and subject to it's output being relatively clean, you can use almost any oscillator configuration. It isn't the oscillator itself that makes the BFO, it's the fact that it beats with a fixed frequency signal, typically from the IF stages of a superhetrodyne receiver. In reality, feeding the osci
The cheapest way would be to use the 4 V signal via a 200 resistor to provide the drive to a four diode balanced modulator and measure the DC output. The trouble is that you will have to calibrate it by putting various lengths of coax in series with the LO to find the relationship between the phase and the DC. Frank
use two double balanced mixer to construct a new IQ mixer and you will get the solution
Any balanced mixer is in principle the "product" modulator, or, a multiplier. The important point is that one of the signals to be multiplied can fully open and close mixer diodes (called a local or pump signal). For diode mixers, the nominal LO level is +7...+13 dBm, or, around 10 mW. The other signal should be lower in magnitude than the first. A
MC1496 is designed for carrier suppression (DSB double side band modulators) but in the same time can be used as product detector, or standard double balanced mixer. SA602 can be used as DSB modulator, but cannot provide the same carrier rejection as MC1496.
Hello, I am trying to make a Discrete DSB modulator without transfmormers fpr a single frequency around 9MHz. I have found some interesting schematics on the net. I would like your ideas of how to transform them to use no coils as well. For example on the varicap schematic how should I re
There are some old mixers can be found on the market, some has outputs: IF1, IF2, inputs: LO, RF. Construction is basically microstrip with two pair-series diodes (4 diodes total). Is it possible to use IF outputs as inputs? For example, put some low-frequency AC waveform, provide some LO and use RF input as output?
If you are looking only to shift the frequency, any RF mixer would follow at its IF output the RF input level, if the mixer is not in compression (RF input level is below P1dB of the mixer). So, you can use any standard DBM (double-balanced mixer) which will preserve your modulation and levels.
I'm looking for a good schematic of FM AV modulator (VCO) in band 900 - 1800 MHz for ATV modulator .. Can someone help me ?
Hi all: I need a simple circuit to make an FSK modulator (with F0 = 400 kHz) with a lausy PLL like LM566 (from N@tional). The receiver is working great with LM 567: with any signal it demodulates, with noise, it demodulates even better, I yel to the board and demodulates too! But I'm still looking for a good modulator. Bandwith = The most I can
You need two mixers, a 90 degree phase network. But I would expect pretty poor carrier/sideband supression since the circuit must be very balanced.
Where to start to simulate this funny circuits, how to put it into HSpice? Any suggestions? Please help! Thanks.
Dear friends, I would like to have some directions as system arrange, pertinent literature, development boards, software, chip set, etc... to design a FM modulator using FPGA. The modulator should have the following specs: Output frequency range: 11MHz to 11.5MHz Deviation capability: 12.5KHz Analog Input signal: Band limited to 100KHz
Dear molloy, Let us know what kind of balanced structure you are using in your project. Basically there are two ways to get a balanced amplifier: a push-pull connection and a connection using power combiner/splitter. The push-pull connection has the advantage to cancel the even harmonics (including the second) and because of that, in some cas