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Topic: Single sideband

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	Single sideband receiver - Patent 4328590
		The single sideband receiver of claim 1, wherein the means for receiving includes an input filter receiving the data signal and the pilot tone, and including a mixer responsive to said filter, said mixer translating the frequency spectrum of said data signal and the frequency of said pilot tone to the predetermined intermediate frequencies.
		The single sideband receiver of claim 2, wherein the predetermined intermediate frequencies are substantially higher than the frequencies of the data signal and the pilot tone such that received signals capable of causing false images are rejected by the input filter.
		The single sideband receiver of claim 10, including means producing an automatic gain control signal in response to the recovered pilot tone, and including limiting means modifying the magnitude of said automatic gain control signal in response to the means for amplifying, said automatic gain control signal controlling the gain of said means for amplifying.
	www.freepatentsonline.com /4328590.html (4819 words)

	Single-sideband modulation - Wikipedia, the free encyclopedia
		Since the final RF amplification is now concentrated in a single sideband, the effective power output is greater than in normal AM (the carrier and redundant sideband account for well over half of the power output of an AM transmitter).
		To recover the original signal from the IF SSB signal, the single sideband must be frequency-shifted down to its original range of baseband frequencies, by using a product detector which mixes it with the output of a beat frequency oscillator (BFO).
		A vestigial sideband (in radio communication) is a sideband that has been only partly cut off or suppressed.
	en.wikipedia.org /wiki/Single_sideband (1370 words)

	Sideband - Wikipedia, the free encyclopedia
		In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process.
		If part of one sideband and all of the other remain, it is called vestigial sideband, used mostly with television broadcasting, which would otherwise take up an unacceptable amount of bandwidth.
		Sidebands are also what cause interference to adjacent channels, and therefore they must be suppressed by filters, either before or after modulation (or often both).
	en.wikipedia.org /wiki/Sideband (470 words)

	The History of Single Sideband Modulation
		Single sideband in general practice, and as referred to in this book, actually is single sideband with suppressed carrier.
		The lower sideband, so called because it is lower in frequency than the carrier, is shown amplified to a level approximately equal to that of the AM carrier.
		In the double-sideband (DSB) system, both sidebands are transmitted, but the carrier is suppressed, unless one sideband is highly attenuated in the receiver, detection of these signals requires that the locally inserted carrier be precise with regard to both frequency and phase.
	dj4br.home.t-link.de /ssb2e.htm (734 words)

	What's New at the Pavek 01
		Single Sideband is a form of Amplitude Modulation.
		A single sideband signal results from removing the carrier frequency and one of the two sidebands, thus drastically reducing interference.
		Although single sideband transmission and reception systems had been used for years by commercial stations, the complex equipment required discouraged use by consumers and amateurs.
	www.pavekmuseum.org /whatsnew01.html (228 words)

	AM, SSB, and FM.
		Sidebands are the new frequencies that are created on either side of the carrier wave.
		As mentioned earlier the voltage of each sideband when a test tone is being transmitted it 100% modulation is 50% of the carrier voltage.
		The single sideband signal requires a bandwidth which is the same as the highest modulating frequency.
	www.angelfire.com /electronic/funwithtubes/Basics_06_Mod.html (3292 words)

	Single-Sideband (Site not responding. Last check: 2007-10-10)
		When you eliminate the carrier and one sideband, all of the transmitted power is concentrated in the other sideband.
		Also, a carrier of proper frequency and amplitude must be reinserted at the receiver because of the direct relationship between the carrier and sidebands.
		For example, assume that a transmitter with a suppressed carrier frequency of 3 megahertz is radiating an upper sideband signal.
	www.tpub.com /neets/book17/74c.htm (1115 words)

	sideband - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-10)
		sideband any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i.e., any frequency added to the carrier as a result of modulation ; sidebands carry the actual information while the carrier contributes none at all.
		Those frequency components that are higher than the carrier frequency are know as upper sidebands; those lower are called lower sidebands.
		The upper and lower sidebands contain equivalent information; thus only one needs to be transmitted.
	www.encyclopedia.com /doc/1E1-sideband.html (226 words)

	Science Fair Projects - Single-sideband emission
		Single-sideband emission is a form of Amplitude modulation in which only one of the sidebands is transmitted.
		Conventional Amplitude modulation transmits a lower sideband, a carrier, and an upper sideband.
		Single-sideband transmission is usually found in shortwave radio bands, with some stations utilizing sidebands to reduce noise in the signal.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Single-sideband_emission (216 words)

	DDR-5K Diversity Receiver
		One sideband is modulated with intelligence 'A' and the other sideband is modulated with intelligence 'B'; An example, one side band might carry a tone shifted (AFSK) signal while the second sideband might carry a voice channel.
		At the receiving station the local oscillator is made to lock in, or synchronize on the frequency of the carrier, preventing the distortion that results if the local carrier is a few hertz off frequency.
		Single sideband with a reduced carrier is called A3A.
	www.jproc.ca /rrp/coverdale_ddr5k.html (772 words)

	Science Fair Projects - Single-sideband modulation
		Amplitude modulation typically produces a modulated output signal that has twice the bandwidth of the modulating signal, with a significant power component at the center carrier frequency.
		This will have two frequency-shifted copies of the modulated signal (the lower one is frequency-inverted) on either side of the remaining carrier wave.
		These are known as sidebands: either upper sideband (USB) or less commonly lower sideband (LSB).
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Single-sideband_modulation (728 words)

	HF Single Sideband Maritime Radiotelephone Channels
		For maritime HF single sideband transmissions, which are always upper sideband, the assigned frequency is always 1.4 kHz greater than the carrier frequency.
		Marine radiotelephony was originally AM (dual sideband), and the carrier and assigned frequencies were the same.
		However, if a single sideband radio with a separate decoder unit is used to receive a sitor, DSC or weatherfax signal, it's likely that receiver would have to be tuned to the carrier frequency for the decoder to work properly.
	www.tvtower.com /hf_single_sideband_maritime.html (656 words)

	Single Sideband Modulator for LF
		For a single trace, one output can be fed to the X amplifier and the other to the Y amplifier to form a vector trace.
		The single sideband output is insufficient to drive the input of the transmitter and amplifier N4 raises the output level by a factor of 10.
		It is evident that sidebands A2 and B2 are in anti-phase and therefore cancel whereas A1 and B1 are in phase and additive.
	users.tpg.com.au /users/ldbutler/SSBModulator.htm (3186 words)

	Single-sideband transmission - Glasgledius (Site not responding. Last check: 2007-10-10)
		Essentially, the carrier and one sideband of an AM signal are removed, leaving only the opposite sideband.
		This reduces the signal bandwidth needed and increases effective power output, as the carrier and redundant sideband account for well over half of the power output of an AM transmitter.
		Since there is no carrier, the signal must be mixed with steady tone beat signal of a proper frequency to be demodulated on the receiving end.
	www.glasglow.com /E2/si/Single-sideband_transmission.html (142 words)

	Analog Devices: Analog Dialogue: Single-Sideband Upconversion of Quadrature DDS Signals to the 800-to-2500-MHz Band
		The two sidebands are 50 MHz apart, with LO feedthrough at a frequency midway between the two at 1.04 GHz This 50-MHz spread is only 5% of the 1-GHz output frequency.
		The DDS "modulating" upper and lower sideband signals are seen 25 MHz away on either side of the LO at 1.04 GHz.
		This level of sideband suppression is indicative of approximately 1 degree of input-signal phase mismatch.
	www.analog.com /library/analogDialogue/archives/34-03/upconversion/index.html (2328 words)

	SSB (Site not responding. Last check: 2007-10-10)
		--> Since the 2 sidebands in a DSB signal carry the same information, then one can go furthur in improving the efficiency of the transmission by transmitting only 1 sideband(upper or lower one can be used).
		The resulting signal is referred to as single sideband SSB.
		Some distortion results from the use of only one sideband to produce the AM signal.
	cnyack.homestead.com /files/modulation/modssb.htm (157 words)

	Kids.Net.Au - Encyclopedia > Single sideband modulation (Site not responding. Last check: 2007-10-10)
		This will have two frequency-shifted copies of the modulated signal (the lower one is frequency-inverted) on either side of the remaining carrier signal.
		To produce an SSB signal, apply a filter that will filter out one of the sidebands, and remove the carrier signal.
		What remains still contains the entire information content of the AM signal, using substantially less bandwidth and power, but cannot now be demodulated by a simple envelope detector.
	www.kids.net.au /encyclopedia-wiki/si/Single_sideband_modulation (369 words)

	Single sideband transceiver projects (Site not responding. Last check: 2007-10-10)
		Packaging Technology single RESULTS Omnitron sideband transceiver projects for a specific communica.Micromechanical or universal access transceiver capstone enhancement between optical transceivers, iridium transceiver module vhf uhf which are compliant 10-Gbit/sec transceivers to function properly they can single sideband transceiver projects greatly increased by LookSmart's single sideband transceiver projects service..
		Frequency Ranges 7 to use of companies including single sideband transceiver projects for long-reach 10-Gbit transceivers are used in the control single sideband transceiver projects This eliminates the connector single sideband transceiver projects industry providing High Speed Data Rates.
		single sideband transceiver projects Abidi, Ahmadreza Rofougaran, Glenn microwave transceiver architecture Chang, Jacob Rael.
	lvds-transceivers.vikabest.com /single-sideband-transceiver-projects.html (465 words)

	The History of Single Sideband Modulation
		This tended to substantiate the concept of a composite wave and, in addition, indicated that one sideband contained all the elements necessary for voice transmission.
		Single sideband was used because of limited power capacity of the equipment and the narrow bandwidths of efficient antennas for those frequencies.
		Single sideband has demonstrated the capacity to double the number of available voice channels within a given frequency range as compared to conventional AM.
	dj4br.home.t-link.de /ssb1e.htm (902 words)

	Single Sideband Receiver (Site not responding. Last check: 2007-10-10)
		We are equipping the SMT with a frequency agile, dual polarization, single sideband, receiver system.
		The two sidebands will be separated in frequency by 10 GHz and as such are readily separated spatially and directed down different paths by use of a Martin Pupplet Interferometer.
		The unwanted sideband is sent through a vacuum window in the dewar lid and is terminated in a 4 Kelvin load.
	kp12m.as.arizona.edu /smt_docs/jt_rcvr_disc.htm (507 words)

	ALMA Memo #357
		Unless the sideband ratio of a heterodyne receiver is close to the ideal value (less than ~ 0.1 dB for a double-sideband receiver, greater than ~ 20 dB for a sideband-separating receiver), a significant correction is required to the single-sideband receiver noise temperature deduced from the Y-factor measured using broadband hot and cold loads.
		In principle, the sideband ratio of a receiver can be measured by injecting CW signals of known relative amplitudes into the upper and lower sidebands and measuring the IF response to each.
		This note shows that the image rejection of a sideband-separating mixer can be measured accurately using CW test signals in the upper and lower sidebands, even when the relative power levels of the test signals are not known.
	www.alma.nrao.edu /memos/html-memos/abstracts/abs357.html (294 words)

	Encyclopedia Search
		and one sideband of an AM signal are removed, leaving only the opposite...effective
		and redundant sideband account for well over half...
		Single sideband modulation is a technique that improves...
	www.encyclopedian.com /search.php?searWords=Carrier-power&Send=Search&match=0&search=0&items=10&start=20 (117 words)

	92105 Single Sideband Selector (Site not responding. Last check: 2007-10-10)
		The 92105 was based on a design by J.L.A. McLaughlin and appeared in the April 1948 issue of QST magazine.
		Thus, even in 1948 they were working on making things a little better from the communications standpoint by listening to just one of the sidebands.
		The Millen Sideband Selector contained a 50kc IF as a result of the aforementioned crystal offset mixing from the receivers IF.
	www.qsl.net /jms/eqpicts/92105.html (495 words)

	RAND \| Papers \| A comparison of single-sideband, suppressed-carrier and double-sideband, full-carrier amplitude ...
		In this paper, SSB and AM signals are analyzed using a wave form that can be varied in shape from a spike through a sine wave to a square wave by varying a parameter.
		The average sideband powers and the peak envelope powers are then calculated and compared.
		The paper shows that the ratio of average sideband power to peak envelope power for AM is more favorable than that for SSB for "squarish" modulating signals.
	www.rand.org /pubs/papers/P7254 (379 words)

	vestigial sideband - a definition from Whatis.com
		Vestigial sideband (VSB) is a type of amplitude modulation (AM) technique (sometimes called VSB-AM) that encodes data by varying the amplitude of a single carrier frequency.
		Portions of one of the redundant sidebands are removed to form a vestigial sideband signal - so-called because a vestige of the sideband remains.
		The actual information is transmitted in the sidebands, rather than the carrier; both sidebands carry the same information.
	whatis.techtarget.com /definition/0,,sid9_gci332235,00.html (268 words)

	92105 Single Sideband Selector
		The 92105 was based on a design by J.L.A. McLaughlin and appeared in the April 1948 issue of QST magazine.
		Thus, even in 1948 they were working on making things a little better from the communications standpoint by listening to just one of the sidebands.
		The Millen Sideband Selector contained a 50kc IF as a result of the aforementioned crystal offset mixing from the receivers IF.
	www.isquare.com /millen/eqpicts/92105.html (495 words)

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