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Topic: Return loss

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	Midcom, Inc.
		Return loss is the ratio, expressed in decibels, of the fractional amount of signal reflection caused by an impedance mismatch (eg: at the input to a transformer with respect to its source impedance).
		Return loss figures are a function of the impedances of the circuits involved and are therefore frequency dependent.
		Using impedance correcting techniques, it is sometimes possible to improve the return loss of the transformer network by adding proper values of compensating capacitance.
	www.midcom-inc.com /Tech/returnloss.asp (217 words)

	Return loss - Wikipedia, the free encyclopedia
		In telecommunication, return loss is the ratio, at the junction of a transmission line and a terminating impedance or other discontinuity, of the amplitude of the reflected wave to the amplitude of the incident wave.
		The return loss value describes the reduction in the amplitude of the reflected energy, as compared to the forward energy.
		Note 2: Return loss is a measure of the dissimilarity between impedances in metallic transmission lines and loads, or between refractive indices in dielectric media, e.g.
	en.wikipedia.org /wiki/Return_loss (261 words)

	The return loss bridge
		Actually, there are two insertion losses-the loss between the source port and the DUT port and the loss between the DUT port and the reflected port.
		This is the insertion loss of the cables at the marker frequency of 415.62MHz.
		Compare Figures 12 and 10 and note that the maximum return loss occurs at the pass frequency and minimum return loss occurs at the reject frequency.
	mrtmag.com /mag/radio_return_loss_bridge/index.html (1330 words)

	Impedance/Return Loss: The Basics Part 1 (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-09-07)
		Return loss (RL) is being specified in the newly ratified TIA/EIA TSB-95 Additional requirements for category 5 cabling and the proposed Category 5e and Category 6 documents.
		Return Loss is one of many parameters regulated by the requirements established for Category 5e and 6 cables.
		Return loss is generated through variations in the impedance of the channel.
	bwcecom.belden.com.cob-web.org:8888 /college/techpprs/imprltp.htm (1638 words)

	SWR, Return Loss, and Reflection Coefficient
		The return loss is simply the amount of power that is "lost" to the load and does not return as a reflection.
		Return loss is a convenient way to characterize the input and output of signal sources.
		The attenuation through a directional coupler or return loss bridge can make measurements difficult when the return loss is high and the test signal is small but the isolator has no "loss" and will work well with very small signals.
	www.wenzel.com /documents/swr.html (2166 words)

	Return Loss tutorial
		Return loss is the difference, in dB, between forward and reflected power measured at any given point in an RF system and, like SWR, does not vary with the power level at which it is measured.
		Return Loss = 20 dBW - 10 dBW = 10 dB
		Return Loss = 50 dBm - 50 dBm = 0 dB
	www.k5rmg.org /tech/rtn-loss.html (1018 words)

	WHAT IS RETURN LOSS
		Return loss is an important new test measurement for local area networks, especially those migrating to higher speed protocols.
		Return loss (RL) is a very important noise measurement recently defined for local area networks (LANs) and LAN components.
		The problem that a return echo presents at the near (or measurement) end of a network is relatively obvious, and everything that we have discussed so far has dealt with that issue.
	www.quabbin.com /tech_briefs/whatisrl.html (2942 words)

	Measuring and Improving Return Loss on the DS317x and DS318x T3/E3/STS-1 LIUs - Maxim/Dallas
		Return loss is then measured, first with a standard test setup and again with an adjusted, improved setup.
		Return loss is the ratio (expressed in dB) of the power of the original signal vs. the power of the reflected signal.
		The test setups and procedures for measuring E3 return loss are described in subclauses A.2.5 and A.2.6 of the ETS 300-686 specification.
	www.maxim-ic.com /appnotes.cfm?an_pk=3763 (1056 words)

	rlndt
		Return loss and ISI are related by insertion loss (attenuation) deviation.
		The difference between attenuation and insertion loss is important in the calculation of the transfer function of the cabling.
		To determine the effects of return loss on data transmission, three connector channel models were created using standard transmission line modeling.
	www.quabbin.com /tech_briefs/rlndt.html (1564 words)

	High return loss fixed attenuator - Patent 5319728
		Light attenuation through a high return loss fixed attenuator is achieved by controlling the offset of two common fiber axes to achieve a controlled transverse misalignment loss while the ends of the fibers are maintained in physical contact under a spring force of the connectors such that a high return loss is achieved.
		The high return loss is achieved by physical contact of the fibers 21, 23 and ferrules 20, 22.
		In manufacturing the high return loss fixed attenuators 10, it will be appreciated that control of the lateral offset D.sub.1 must be accurately controlled to ensure accurate manufacture of a device with a desired attenuation.
	www.freepatentsonline.com /5319728.html (3558 words)

	Co-Axial Cable Insertion and Return Loss Measurements
		Return loss is a measure of VSWR (Voltage Standing Wave Ratio), expressed in decibels (db).
		For example, a cable with a return loss of 21 db is better than another similar cable with a return loss of 14 db, and so on.
		Note that the Insertion Loss is typically low in the desired band of frequencies, and the Return Loss is high.
	www.tutorialsweb.com /rf-measurements/co-axial-cable-measurements.htm (776 words)

	PRESS RELEASE Arrayed Fiberoptics Corporation Announces High Return Loss 2D Fiber Arrays (Site not responding. Last check: 2007-09-07)
		It is for this reason that angle polish is typically employed for linear fiber arrays, as the angle polish increases the return loss to acceptable levels.
		Arrayed Fiberoptics' high return loss (HRL) 2D fiber array incorporates a patent-pending optical design which increases the return loss of a surface-normal polished 2D fiber array by an additional 15 dB, or an attenuation factor of 30.
		Combined with an anti-reflection coating, the return loss of a HRL 2D fiber array easily surpasses 40 dB; typical return loss is around 50 dB.
	www.marketwire.com /mw/release_html_b1?release_id=81699 (571 words)

	Oscillator output level, return loss and load (Site not responding. Last check: 2007-09-07)
		VHF and higher frequency oscillators should be specified to have reasonably good return loss (10 dB or better).
		Return loss is a popular way to specify the output impedance since it is easily measured.
		The dB difference between the test signal and the reflected signal is the return loss (after correcting for the coupler's loss).
	www.wenzel.com /documents/output.html (432 words)

	Fibrepulse - Return Loss Testing
		Return loss represents the amount of light that does not get reflected back at a connection point.
		Therefore, the higher the return loss, the lower the reflection and the better the connection.
		Typical values achieved for return loss are in excess of 55 dB.
	www.fibrepulse.com /html/return.html (329 words)

	New Tax Law Eases Loss Limitations for Katrina Victims
		However, because a Hurricane Katrina loss is a disaster loss, you have the option to deduct it on your tax return for the previous year, 2004.
		Claiming the loss on an original or amended return for 2004 will provide you an earlier refund, but waiting to claim the loss on this year’s return could result in a greater tax saving, depending on your tax situation for 2005.
		Taxpayers filing or amending their 2004 tax return and whose only casualty or theft losses to personal use property claimed on that return were caused by Hurricane Katrina should write in red ink “Hurricane Katrina” at the top of Form 1040X.
	www.irs.gov /newsroom/article/0,,id=149524,00.html (966 words)

	Measuring Return Loss on T3/E3/STS-1 LIUs - Maxim/Dallas
		Thus, return loss indicates the relative size of the reflected signal and, therefore, how perfectly or imperfectly the transmission line is terminated.
		If the measured return loss of an LIU card is 20dB at a given frequency then the reflected signal has 20dB less power than the original signal at that same frequency.
		Return Loss for the DS3150 LIU can be improved several ways.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3547/ln/en (928 words)

	OptoTest: Your Test Solution for Fiber Optics
		Insertion loss (IL) and return loss (RL) on fiber optical components are measured fast and accurately with the OP930.
		The return loss is measured with the "no mandrel" method, meaning neither matching gel nor mandrel wraps are required at the far end of the cable.
		The insertion loss is measured by utilizing the stable transmitter of the return-loss as the source in combination with the precision optical power meter.
	www.optotest.com /op930page.htm (198 words)

	Martha Stewart Living posts narrower second-quarter loss, advertisers return (Site not responding. Last check: 2007-09-07)
		Martha Stewart Living posted a loss of $1.17 million US, or two cents per share, in the three months ended June 30, compared with a loss of $33.49 million, or 65 cents per share, in the year-ago period.
		It also expects an operating loss in the range of $10.5 million to $11.5 million and an adjusted loss in EBITDA, or earnings before interest, taxes, depreciation and amortization, in the range of $5.5 million to $6.5 million.
		The company expects a full-year operating loss in the range of $6 million to $8 million with adjusted EBITDA in the range of $12 million to $14 million.
	www.cbc.ca /cp/business/060726/b0726116.html (773 words)

	Hearing Loss Claims - Defense Guidelines (Site not responding. Last check: 2007-09-07)
		Hearing loss benefits are payable by the employer during the last maritime employment in which the claimant was exposed to the injurious stimuli, i.e., loud and excessive noise, prior to the date upon which the claimant became aware of the fact that he was suffering from an occupational disease arising naturally out of his employment.
		The court held that hearing loss is not an occupational disease.
		In other words, if a pre-employment audiogram shows a 30% binaural loss and a subsequent audiogram shows a 35% loss, then the Special Fund would be liable for 30% and the last responsible employer would be liable for 5%.
	www.claimline.com /articles/csa3.html (1296 words)

	JDSU ORL-55 SMART Optical Return Loss Meter
		This instrument can be used in three different modes as a return loss meter, optical power and loss meter and a laser source.
		High return loss values are essential for ensuring the signal quality especially with CATV & FTTx.
		Return loss referencing can be performed via a single key stroke.
	www.jdsu.com /spain/products/descriptions/OMK/Return_Loss_Meters/ORL55 (294 words)

	Hobby Loss, IRS and Tax (Site not responding. Last check: 2007-09-07)
		If you lose money pursuing a hobby, you cannot deduct your hobby loss from your other income on your tax return, but you can deduct your expenses up to the amount of your hobby income on your tax return.
		A hobby loss is a miscellaneous tax deduction on your tax return, though, and limited by the 2% of AGI threshold.
		A loss upon the sale is not tax deductible on your tax return.
	www.wwwebtax.com /deductions_z_other/hobby_losses.htm (544 words)

	Return
		The return consists of the income and the capital gains relative on an investment.
		The general rule is that the more risk you take, the greater the potential for higher return - and loss.
		Return is also used as an abbreviation for income tax return, see 1040 Form.
	www.investopedia.com /terms/r/return.asp (215 words)

	VSWR - Return Loss - Termination Resistance - Impedance - Filtronetics, Inc.
		VSWR - Return Loss - Termination Resistance - Impedance - Filtronetics, Inc.
		For example, a 75 ohm load termination to a 50 ohm source will yield a VSWR of 1.5 since 75/50=1.5.
		Return Loss - The number of dB that the reflected signal is below the incident signal.
	www.filtro.net /center/encyclopedia/VSWR.HTM (124 words)

	SWR, Return Loss, and Reflection Coefficient (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-09-07)
		And the terms 'power transmitted', 'transmission loss' and 'power reflected' need no explanation beyond explaining that they are usually percentages.
		This "magic" defies linear "common sense" for passive networks but isolators are highly non-linear devices employing special ferrite in powerful magnetic fields.
		It is also desirable to use small signals when testing antennas for obvious reasons.
	www.wenzel.com.cob-web.org:8888 /documents/swr.html (2175 words)

	Measuring Return Loss Using the Advantest R3132 Spectrum Analyzer - Maxim/Dallas
		Measure the return loss at 860kHz for the DUT, as shown in Figure 10.
		Measure the return loss at 1.72MHz for the DUT, as shown in Figure 11.
		Measure the return loss at 34.368MHz for the DUT, as shown in Figure 12.
	www.maxim-ic.com /appnotes.cfm?an_pk=3670 (1353 words)

	RedOrbit - Technology - Acterna Adds Return Loss Meter to Line of Widely Deployed Optical Handheld Field Instruments (Site not responding. Last check: 2007-09-07)
		Acterna, the leader in test and management solutions for consumer and business broadband communications, today announced the addition of a handheld return loss meter, the Acterna ORL-55, to its industry-leading optical field instruments, the SMART optical handhelds.
		The new ORL-55 SMART Optical Return Loss Meter is a high-performance, easy-to-use instrument for the field as well as for lab and production.
		Return loss is measured at up to three wavelengths simultaneously by using sophisticated digital signal processing.
	www.redorbit.com /news/display?id=154398&source=r_technology (618 words)

	Return loss now matters. \| Technology > Computer Networking from AllBusiness.com (Site not responding. Last check: 2007-09-07)
		Defining and quantifying return loss is mandated with new faster, bidirectional signaling being implemented.
		known that return loss is an important parameter for cabling used in bidirectional signaling.
		The residual ISI budgeted for Gigabit Ethernet is only 2.1mV rms in order to meet the desired signal to noise ratio and bit error rate requirements for its five-level signaling scheme (Source: Rao).
	www.allbusiness.com /technology/computer-networking/621738-1.html (683 words)

	Lightwave - Acterna intros handheld optical return loss meter
		The company says its ORL-55 SMART optical return loss meter is a high-performance, easy-to-use instrument for the field as well as for in lab and production environments.
		Return loss is measured at up to three wavelengths simultaneously by using sophisticated digital signal processing, according to the company.
		According to the company, the testers are identified by their product names: OLA (variable optical attenuator), OLP (optical power meter), OLS (optical light source), OLT (optical loss test set), OMK (optical measurement kit), and ORL (optical return loss meter).
	lw.pennnet.com /Articles/Article_Display.cfm?ARTICLE_ID=229746&p=13&subsection=TestI (444 words)

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