The kind of preselector associated with a receiver, or a high end analyzer like the HP8566 has a tunable front end that tracks the analyzer tuned frequency. This will solve your problem, but at great cost, plus I don't know of one that would work with your analyzer. The after-market kind of preselector has fixed bands. It is basically a box of bandpass filters and coax switches. To the best of my recollection, the last band is 30 - 1000 MHz, not much preselection there. In my experience with OATS (limited) the only band where I needed extra attenuation was the FM band, and you can buy a cheap FM trap to knock that out. Then you could use a preamp between trap and analyzer to get the noise performance you desire. If there were say one or two other limited bands requiring attenuation, you might be able to find an off-the-shelf band stop filter there, too, or have one built. This would probably cost a few thousand dollars. By comparison, the HP add-on preselector for the HP8566 (which would not work with your Advantest) costs about $20K. The HP8447 preamplifier (F=8 dB, G = 20 dB, per my recollection) costs about $2K.
---------- >From: "Colgan, Chris" <[email protected]> >To: "'Emc-Pstc' (E-mail)" <[email protected]> >Subject: Receivers and spectrum analysers >Date: Fri, Mar 24, 2000, 3:34 AM > > > Greetings all > > I have an Advantest spectrum analyser with a quasi peak detector that I use > for pre compliance work. I am having trouble with the high noise floor and > I am concerned about my measurements reading low due to overloading the > detector (no input attenuation due to the high noise floor etc etc). > > I have been told (mainly by sales reps) that by using a preamplifier (cheap, > not a problem to buy) and a preselector (expensive, could be a problem) I > can obtain results that are virtually equivalent to a receiver (very > expensive). > > Has anyone tried the analyser/preselector approach and if so, how have you > got on? > > Regards > > Chris Colgan > EMC & Safety > TAG McLaren Audio Ltd > > mailto:[email protected] > > ===================================================== > Authorised on 03/24/00 at 09:35:59; code 37f48bf3B1A8A7D9. > > > ********************************************************************** > The contents of this E-mail are confidential and for the exclusive use of > the intended recipient. > If you receive this E-mail in error, please delete it from your system > immediately and notify us either by E-mail, telephone or fax. You should > not copy, forward or otherwise disclose the content of the E-mail. > > TAG McLaren Audio Ltd, The Summit, 11 Latham Road > Huntingdon, Cambs, PE18 6ZU > Telephone : 01480 415600 (+44 1480 415600) > Facsimile : 01480 52159 (+44 1480 52159) > ********************************************************************** > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
