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What are advantages and disadvantages of ssbsc transmission compared with full-carrier AM?
in SSB-SC only one side band of AM s/g is sent frm Transmitter instead of both sideband and carrier in that of DSB-FC(DSB-FC consist of upper side band ,lower side band both conveying same information i.e. mirror image of each other and original carrier i.e. after the process of modeulation carrier is also present in DSF-FC s/g). thus DSB-FC = USB+LSB+Cariier hence total power in DSB-FC= cariier pow+ usb pow+lsb pow SSB-SC = either USB or lsb toatal pow= pow in single side band 1.using SSB-Sc power is saved. 2.Bandwith is reduced 3. noise immunity is more.
What is the generation of Single Sideband?
It is the separation of the inverted bands of signals which are formed when an audio signal is mixed with a carrier. This was once thought to be Amplitude Modulation but in fact results in the original carrier plus 2 bands of signals translated from audio to Radio Freq. when they were mixed. They lie on either side of the carrier freq, with the lows adjacent to the carrier and heading away in both directions, LF or HF from carrier frequency to higher tones. For Single Side Band (SSB) use, the carrier is suppressed at generation, as far as is possible, by the use of a balanced modulator in order not to be present in the final signal, in order not to radiate. The side-band chosen for suppression is then attenuated by various methods, modern systems using a crystal filter no wider than the audio band width required for the purpose in hand. It can also be achieved by phasing in the generation stage. Speech is often tailored to as low as 1.8 khz band width, 2.4 khz at the most, for comms. purposes. The advantages of this system over the original double side-band plus carrier, erroneously named AMPLITUDE modulation, are many. Economies of :- Spectrum occupation: Although inverted, both side-bands contain identical information. We really don't need to send it twice in order to reproduce the original sound at the other end. Saves valuable space in the spectrum. Narrow Receive filters will get rid of the next-door neighbours when the system takes advantage and packs more stations into the newly available space. Power: The suppression of the unnecessary side-band reduces the power used and /or the power handling requirements of the device needed to generate the transmitted signal. Alternatively the saved power can be devoted to the wanted side-band, thus increasing the signal at the far end. Similarly, suppressing the carrier will save even higher levels of power, with all the same benefits. The carrier is crucial in the final signal but very easy to re-insert at the receiver end for microscopic amounts of power, ironically in a similar circuit to that which suppressed it in the first. Yet another significant power saving is the removal of the need for a high power audio amplifier used to modulate (mix really) the audio onto the transmitter at very high levels. With the high level "modulation" audio power of 50% of the transmitter power is needed. A 1kW transmitter needs 500 watts of audio whereas done in the early stages of the transmiiter, it needs micro-watts. Outcome: Either lower power consumed or more "talk power" (with the associated increase in signal strength at the far end) for a given amount of power. The original power level had to include 3 sets of signals..Two sidebands, only one of which is needed and an enormous carrier, which isn't needed at all. This shows that it wasn't a carrier after all. How you know that the carrier is on the correct frequency, as you tune your receiver? The other fellow stops sounding like Donald Duck, when you get it right.............easy!
What is the difference between am-dsb and am-ssb?
Am- DSB stands for Double or Duplex Side Band Am- SSB- amplitude modulation, which is what Am means, Single-Side-Band, sideband sometimes written as one word but abbreviated phonetically as SSB. SSb is widely used in amateur radio and some forms of CB as well. the concept is related to the much older, and still viable idea of Bandspreading, or Bandspread where the tuning is split over two dials or a subdial for the fine-tuning harmonics. applied to receivers only. Get some old electronics magazines from the thirties from Lindsay"s publications, angled at the hobbyist they explain things as they go along. the Gernsback l934 Short wave manual is good technical theory and also has reviews and circuit diagrams of many then current radio gear, great fun for browsing.=and technically correct. ********************************************************** Normal a.m. transmission has a carrier and two identical sidebands, the upper and lower. That's a.m. d.s.b. (double sideband). The sum of the power in the two sidebands can't exceed half that of the carrier. For example, a 100W carrier modulated to 100% will have 25W in each sideband. It is possible to achive better efficiency by suppressing the carrier, which means that half the transmitted power will be in each sideband. That's still d.s.b., with the addition of s.c. to indicate the difference. A further increase in efficiency can be achived by also suppressing one of the sidebands, so all of the transmitted power is in that sideband. That is what is normally referred to as s.s.b., but more correctly it's s.s.b. s.c.
What is over-modulating condition in term of amplitude modulation?
When your audio modulating signal is larger than your RF carrier amplitude the peak of the modulated carrier will become flat and a distorted audio signal with flattened peaks will be send out from the detector on the receiver side
Range of citizens band radios?
It depends on the antenna and the quality of the CB. Personally, one of mine gets transmissions from the other side of the US, from Illinois to California. I'm only 12, but I LOVE TECHNOLOGY!
Difference between dsb lc dsb SC?
The difference between double side band long carrier (DSB LC) and double side band short carrier (DSB SC) is the is how the amplitude modulation (AM) is referenced in the carrier wave.
Is carrier signal present at output of double side band suppressed carrier?
No, the carrier signal is not present at the output of double side band suppressed carrier. That is what suppressed carrier means. However, the receiver has enough information to regenerate the carrier if need be. The advantage of suppressed carrier mode is that more power can be deployed to the signal-carrying portion of the modulated carrier.
How do you calculate frequency range of double side band modulated signal?
Upper sideband = Carrier frequency + modulating frequencyLower sideband = Carrier frequency - modulating frequency
What the difference between single side band single carrier transmission and full carrier AM?
1. Single-sideband transmission requires only half as much bandwidth as double sideband.2. SSBSC require less total transmitted power than full carrier AMIn full carrier AM, the transmitted signal consists of two sidebands (containing the transmitted information) and the carrier signal. Long ago, it was realized that both sidebands contained the same information, and the carrier signal could be supplied by the receiver. Thus, if you suppress transmitting the carrier and one sideband, you can use the available power to increase the power in the remaining sideband.
What are advantages and disadvantages of ssbsc transmission compared with full-carrier AM?
in SSB-SC only one side band of AM s/g is sent frm Transmitter instead of both sideband and carrier in that of DSB-FC(DSB-FC consist of upper side band ,lower side band both conveying same information i.e. mirror image of each other and original carrier i.e. after the process of modeulation carrier is also present in DSF-FC s/g). thus DSB-FC = USB+LSB+Cariier hence total power in DSB-FC= cariier pow+ usb pow+lsb pow SSB-SC = either USB or lsb toatal pow= pow in single side band 1.using SSB-Sc power is saved. 2.Bandwith is reduced 3. noise immunity is more.
What is a carrier wave?
A modulated carrier wave is the output of a modulator that includes the information of the signal that is applied to the carrier.When a signal typically a piece of music in the range of say 30Hz to 30KHz is applied to an AM modulator (not sure about FM or PM) with a carrier of say 3MHz the output consists of 4 packetsUpper Sideband (Carrier + Signal) 3.000003MHz to 3.03MhzLower Sideband (Carrier - Signal) .297MHz to .299997MHzCarrier 3MHzSignal 30Hz to 30KHzEither sideband in the case of Single Side Band (SSB) or Both (.297MHz to 3.03Mhz) in the case of Double Side Band (DSB) could be referred to as modulated carrier waves
What is a modulated carrier waves?
A modulated carrier wave is the output of a modulator that includes the information of the signal that is applied to the carrier.When a signal typically a piece of music in the range of say 30Hz to 30KHz is applied to an AM modulator (not sure about FM or PM) with a carrier of say 3MHz the output consists of 4 packetsUpper Sideband (Carrier + Signal) 3.000003MHz to 3.03MhzLower Sideband (Carrier - Signal) .297MHz to .299997MHzCarrier 3MHzSignal 30Hz to 30KHzEither sideband in the case of Single Side Band (SSB) or Both (.297MHz to 3.03Mhz) in the case of Double Side Band (DSB) could be referred to as modulated carrier waves
What is a carrier reinsertion oscillator?
A carrier reinsertion oscillator is an electronic circuit used in a radio receiver that is designed to receive single side band carried suppressed radio transmissions. As suggested by the name, in a single side band carried suppressed signal, the carrier signal is suppressed (not transmitted) to save power and/or bandwidth. Before the single side band carried suppressed signal can be decoded to extract the original audio signal, the carrier must first be reinserted. This must be done accurately, otherwise the recovered audio signal will be unintelligible.
What is disadvantages of ssbsc transmission compared with full-carrier AM?
Complexity of the receiver. SSBSC says it all: Single Side-Band, Suppressed Carrier The spectrum of an AM signal includes two (mirror) sidebands, on either side of the carrier (the nominal AM frequency on the dial). By suppressing a sideband and the carrier, the transmitter can spare the energy that would otherwise go into those signal components, which can represent two-thirds of the total energy in a standard AM signal. This comes at a cost of higher complexity in the receiver, since it needs to recreate the missing parts of the signal before it can demodulate it. And since there is no carrier frequency, a superetherodyne receiver (that can lock on to the carrier, like all modern AM receivers) will not work; other strategies must be used to compensate carrier drift.
What is side frequency?
The Carrier....
What are the names of the different types of steel pan found in a steel band side?
You have... lead pan double tenors double seconds guitar cello bass
What are the Applications of double side suppressed carrier modulation?
Each of the two sidebands can be modulated independently to give two simultaneous communication channels. There would be no point in radiating the carrier, as it carries no information, and would waste transmitter power.
