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Topic: Sideband


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  SideBand Systems: Experienced Wireless Network Communication Engineering in New England
SideBand Systems, Inc. is your best source for wireless communication system selection and deployment.
SideBand provides solutions based on your needs; we are not constrained by a limited number of manufacturers or technology types.
SideBand offers systems that cost effectively resolve facility to facility communication for wireless LAN and T Carrier applications.
www.sidebandsys.com   (150 words)

  
 Sideband Technology
Sideband Technologies today announces a major milestone in their UAV development program.
Established in 2004, Sideband Technology is a small and focused development company.
The final concept is for a small low-cost electric powered VTOL UAV which is simple to deploy and easy to operate.
www.sideband.com   (137 words)

  
 8VBS 8-level vestigial sideband modulation
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.
When the 'wrong' sideband is only partially suppressed, the resulting modulation technique is known as vestigial-sideband modulation (VSB).
To recover the original signal from an SSB signal, the carrier must be replaced with an extra substitute carrier signal, sometimes called a "false carrier", prior to sending the signal to a standard envelope detector.
www.8vsb.com   (691 words)

  
  The History of Single Sideband Modulation
In 1914 it was established mathematically that an amplitude-modulated wave consists of a carrier and two identical sidebands which are spaced above and below the carrier by an amount equal to the modulating frequency.
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.
dj4br.home.t-link.de /ssb1e.htm   (902 words)

  
  SIDEBAND LASING   (Site not responding. Last check: )
This phenomenon occurs when gain is generated by resonant coupling between the FEL's radiation field and the coherent synchrotron motion of electrons trapped within the ponderomotive potential as the FEL reaches saturation.
The fundamental starts up and saturates at ~2400 W. Gain is then present for the sideband which then follows a similar startup and saturation at ~5000w.
Sideband power appears lower because the pulse is integrated in this measurement and the fundamental has higher spectral density (narrower linewidth).
sbfel3.ucsb.edu /6mv/sideband.html   (164 words)

  
 Frequency-hopped single sideband mobile radio system - Patent 4479226
It is an aspect of the present invention to provide a means for employing a single sideband transmission scheme in a mobile radio environment which overcomes the crosstalk interference problem inherent in multiple signal single sideband systems.
It is a further aspect of the present invention to provide a single sideband system that offers a degree of communication privacy to the users of the system by controlling the sequence of hopped carrier frequencies by a suitable scrambling code.
A block diagram of an exemplary frequency-hopped single sideband transmitter 10 for use, for example, in a mobile unit of a mobile radio system is illustrated in FIG.
www.freepatentsonline.com /4479226.html   (4454 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.
While all forms of modulation have sidebands by definition, it is most commonly discussed in amplitude modulation (AM).
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.
en.wikipedia.org /wiki/Sideband   (470 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)

  
 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)

  
 Sideband Cursors in VSI Rotate Pus   (Site not responding. Last check: )
The first part of the animation shows the center of the sideband cursor group being lined up on order 30.72.
Then the animation shows the sideband cursor positioned to identify the first family of harmonics at a differential of.850 of an order.
Then the sideband cursor is moved again to line up with the second family of harmonics at.788 of an order.
www.vold.com /sideband.htm   (260 words)

  
 Single Sideband Receiver   (Site not responding. Last check: )
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.
The desired sideband is sent through a different window and on into the receiver.
maisel.as.arizona.edu /smt_docs/jt_rcvr_disc.htm   (507 words)

  
 Definition: sideband   (Site not responding. Last check: )
sideband: In amplitude modulation (AM), a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process.
The frequencies above the carrier frequency constitute what is referred to as the "upper sideband"; those below the carrier frequency, constitute the "lower sideband." In conventional AM transmission, both sidebands are present.
This HTML version of Telecom Glossary 2K was last generated on Wed May 8 15:36:48 MDT 2002.
www.its.bldrdoc.gov /projects/devglossary/_sideband.html   (87 words)

  
 sideband - HighBeam Encyclopedia
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   (398 words)

  
 Single Sideband Modulator for LF
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.
Diagrams (a) show two carriers A and B of the same frequency and phase, one of which is modulated in a balanced modulator by an audio tone to produce contra-rotating sidebands A1 and A2, and the other modulated by a 90 degrees phase shifted version of the same audio tone.
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)

  
 ALMA Memo #357
  (Site not responding. Last check: )
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)

  
 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.
As a workaround until the state of the art improved, SSB was transmitted with a "pilot carrier" plus one sideband.
www.jproc.ca /rrp/coverdale_ddr5k.html   (772 words)

  
 Single Sideband Receiver   (Site not responding. Last check: )
The actual sideband separation occurs in the room temperature quasi-optic assembly mounted to the top plate of the dewar.
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.
aro.as.arizona.edu /smt_docs/jt_rcvr_disc.htm   (507 words)

  
 Single-Sideband
When you eliminate the carrier and one sideband, all of the transmitted power is concentrated in the other sideband.
While we don't have the annoyance of heterodyning from adjacent signals, a weak ssb signal is sometimes completely masked or hidden from the receiving station by a stronger signal.
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)

  
 RF Cafe - Quadrature (I/Q) Modulation Modulator Sideband & Carrier Suppression
If the phases and amplitudes of both data stream (in-phase "I" and quadrature "Q"), then one of the sidebands is completely cancelled out.
In practice, complete cancellation is never accomplished, but without too much work, achieving 40 dB of sideband cancellation is not hard to do.
Even 60 dB is relatively easy; however, preventing drift due to thermal and mechanical effects is not so easy, and the result is that a "textbook" quadrature alignment during alignment can look pretty bad over time.
www.rfcafe.com /references/electrical/quad_mod.htm   (203 words)

  
 Single-sideband modulation - Wikipedia, the free encyclopedia
, and the two sides of each axis are called sidebands.
By a general property of the Fourier transform, that symmetry means it is the complex conjugate of
Note that the sum of the two sideband signals is
en.wikipedia.org /wiki/Single_sideband   (1357 words)

  
 Why did ATi disable Sideband addressing??? - Rage3D Discussion Area
A sideband is an additional data path between the system memory and the processors apart from the main bus.
It takes the address and command instructions from the main bus and sends them on a sideband to the system chipset.
Sidebanding lets the graphics processor line up new data requests as the main bus continues to gather data.
www.rage3d.com /board/showthread.php?t=33733217   (1507 words)

  
 SSB Modulator Draws Only 5mA at 2.7V - Maxim/Dallas
This SSB modulator generates the lower sideband of a high-frequency carrier modulated by an applied audio signal.
The traditional method for producing SSB is to modulate a carrier, and then filter the output to remove the unwanted sideband and carrier frequencies.
This suppression performance depends somewhat on the presence of capacitive terminations (C4 and C5) for the unused modulator inputs I and Q. The output stage (not shown) can be a single-transistor buffer, a class C power amplifier, or whatever the application requires.
www.maxim-ic.com /appnotes.cfm/appnote_number/1047   (683 words)

  
 ESSB Extended Single Sideband
While "Extended Single SideBand" is certainly an "Enhanced" form of SSB, "Enhanced SSB" is not necessarily "Extended" in bandwidth and fidelity!
I originally authored the term "Extended Single SideBand" for a reason and it is declared as such!
The problem with AM however, is that to reproduce 7.5 kHz of audio with accuracy, the RF bandwidth would be required to be 15 kHz wide!
www.icycolors.com /nu9n/essb.html   (2535 words)

  
 AGP Sidebanding vs. AGP Overclocking
However, please remember that if your AGP does not support sideband support out-of-the-box, it's likely that it was not designed to support sidebanding at all.
Also, enabling sidebanding support while overclocking the AGP bus can hang the system, particularly if the speed of the AGP bus is high.
When you come in a new place with new textures, it seems that you have a small break of some tenth of seconds or less and this stop is not related to an IO operation on the HD or something else (no background task, no lack of memory,...)...
www.adriansrojakpot.com /Speed_Demonz/AGP_Sidebanding/AGP_Sidebanding_Comments_01.htm   (1453 words)

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