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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
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.
"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 (...)
Hi, Look for the appnotes below. Some balanced amplifiers are presented, you'll find usefull info inside the xx to tt[/colo
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....
The two diode type is singly balanced and the four type is double balanced. This means that either one or both of the drive signals (such as audio and carrier) does not appear in the output at significant amplitudes. In the singly balanced design it is best to allow the baseband through and suppress the carrier due to the baseband (...)
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 (...)
How to find the sensitivity of an AM modulator circuit. Hi , i have this AM modulator .. its a low level modulator ..with a bc548a transistor .. and i hav to find the sensitivity of this circuit .. how do i find it. ? .. I hav this due today . .. can nyone please help me out with this ? \ Thanks in advance...
hello everyone, can anyone provide me a link for making a amplitude modulator circuit running at frequency 1-1.5GHz. Or else if it's not possible then inform me about the same. Also what are the other methods that I can use to modulate a message signal with a sinusoidal carrier at f = 1-1.5 GHz?
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 ? (...)
Another attempt to explain the balanced modulator or ring modulator
Hi all, i am new to analog communication plz if any one can guide me to design phase modulator cct Thanks wajahat
hi all, i'm doing IC modulators. in that i'm implementing FM modulator at transistor level in an IC. can any one give me circuit of fm modulator realizable in an IC and the technical details with specifications. thanks and regards,
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, (...)
Hi , i have this AM modulator .. its a low level modulator ..with a bc548a transistor .. and i hav to find the sensitivity of this circuit .. how do i find it. ? .. I hav this due today . .. can nyone please help me out with this ? \ Thanks in advance... 51245
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
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 (...)
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 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 (...)
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.
Hi friends can any one plz tell me how to simulate, the ASK modulator circuit used in the 13.56 MHz RFID
In real life the NF of a balanced amplifier is approximately 25% greater than the NF of a similar single amplifier.
Hello to all since this is my first post. Im designing a modulator circuit based on an fpga chip from altera. The pins provide a 4.3v voltage output (as a logical 1) and i have a d/a selfmade circuit based on opamps (as adders). The purpose of the selfmade circuit is that by changing the resistors i can micromanage the (...)
Yes, but it hasn't to do with FM. The spectrum indicates an ineffective amplitude modulation. You should rather use a analog multiplier or balanced mixer for AM with suppressed carrier. To get a single sideband only, you can either use a filter or apply well-known single-sideband methods, involving phase shifted signals. See: en.wiki
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
what does PIN modulator perform in Gunn oscillator....
The well known and tested video modulator by elektor which generates harmonics. powered by a stabilized 5V PSU. Complete article here: RF modulator D.I.Y. How can this be simplified even more to avoid the coils if possible? Some of
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 (...)
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.
hi when i think start to design am transmitter circuit many question confuse me according to theory to design low level transmitter we need amplifier ,oscillator and modulator circuit but now i am confuse which modulator,oscillator and amplifier are use for low level transmitter please someone tell me
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
guys I built a stand-alone colpitts oscillator to generate carrier wave Now i want to make a frequency modulator circuit with the help of transistor but no idea to modulate the signal with carrier plz give me circuit diagram to modulate carrier with audio signal using transistor
Hi my friends, I am very very new at this. I am from Venezuela, my teacher asigned us to built a 4-ASK modulator with discrete components, the problem is that I have only found one ASK modulator circuit and it uses IC (chips), The problem is that I have no idea how is the diagram or circuit of a 4-ASK (...)
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
hi i am little bit knew about electronics basics.i am really mad about how to design ask modulator . from about 2 weeks i tried some circuits available in google. but i couldn't get the required rectangular output. plz anybody give me awareness about how to design ask modulator circuit . i have to give the ask input to (...)
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.
Top valve input is Va - Vb Bottom valve input is Va + Vb Do a double substitution, first for the combination of Va and Vb then put this sum in the first transfer equation. Output is gm times plate load resistance. Sum the outputs noting that they are out of phase. Your result should be that the output contains terms of Vb, combinatio
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
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!
Hello, I have a requirement to transmit the output of a CCTV camera with out wires over a distance of 6Km. The live video has to be shown in a TV. Please suggest me how to do this. Best Regards, Vdharan
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 (...)
Is it possible to get a multi-chip module that includes a pre-coded read-only ASIC and probably a rectifier/modulator circuit for passive RFID tag operation? I have read about hybrid microcircuit OM1690 / OM1690S, but I can't find it anywhere on the web. Need to design a 2.45GHz RFID tag and I am already working on the antenna, just need (...)
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 (...)