A couple issues. First, on topic, beware of modern-day “pre-selectors.” You will find either quite broad tracking filters, and/or a series of very broad fixed bandpass filters selected by coaxial relays. To my knowledge there is not a single manufacturer today making a pre-selector with bandwidth with say ten times the required resolution or 6 dB bandwidth. If someone out there can contradict me on this, please do, with manufacturer and model number, please!!!
Second, please folks, there is no such thing as an EMC receiver. It may seem like semantics, but you can’t receive electromagnetic compatibility. May be you can ask Santa for it, but I doubt he will deliver. What you receive is EMI – electromagnetic interference, and the entire purpose of the receiver is to quantify the amount of EMI, and compare it to a limit. The limit is there to control the amount of EMI generated so that we can expect some level of electromagnetic compatibility. For instance, we control RE at three meters so that at typical BCB reception levels, we have clear reception. That is EMC. If we move the culprit emitter closer to the radio receiver than three meters we no longer have a legitimate expectation of clear reception. With this sloppy terminology, rife in the commercial world, we are raising a generation of EMC engineers who have no clue why they do what they do, other than they have to meet some legal requirement before marketing a product. It is bad enough that I have seen in this forum otherwise well-regarded engineers claiming that radiated emission requirements are there to protect all electronics from interference, as opposed to radio receivers, which are the sole victim protected by radiated emission limits. Non-antenna-connected electronics don’t require that level of protection. Oh, yeah, one other thing. The holiday season has officially begun. Happy Holidays! Ken Javor Phone: (256) 650-5261 ________________________________ From: Jim Eichner <jim.eich...@xantrex.com> List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Fri, 28 Nov 2008 00:50:18 -0800 To: <emc-p...@ieee.org> Conversation: EMI Receivers Subject: RE: EMI Receivers Many posts have addressed the calibration part of this question, but not the make and model part. We have an aging HP rack that we are considering relegating to spare status by purchasing a new or nearly new spectrum analyzer or EMC receiver (I think the line there is blurring a bit these days but we want/need a preselector if that affects the semantics at all). I don’t think we need 18GHz for our applications, so if you have a favourite that tops out at a lower frequency please include it. I don’t want to hijack Tim’s originally 18GHz enquiry though. Thanks, Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: jim.eich...@xantrex.com web: www.xantrex.com <http://www.xantrex.com/> <http://www.xantrex.com/> Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of emcp...@aol.com Sent: Thursday, November 20, 2008 11:39 AM To: emc-p...@ieee.org Subject: EMI Receivers Hello, I'm looking to purchase an EMI receiver for use in a 5 meter chamber. Does anyone recommend a certain model? I would want one that has at least a frequency range from 150kHz to 18GHz so one unit can be used for radiated and conducted emission measurements. I'm looking for a unit that can be calibrated by a local accredited calibration lab. I believe all R&S receivers need to be sent to them for calibration, which there would be risk and time involved in shipping. Thanks, Tim Pierce ________________________________ One site has it all. Your email accounts, your social networks, and the things you love. 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