John, Another option to consider is the HP 8449B PreAmplifier. It may have higher noise floor than Ed's suggestion below, although at 3 meters it may be sufficient, depending on antenna factors. It is a catalog item.
An interesting option that I saw a couple of weeks ago in Seattle at the IEEE EMC Symposium is the HP 84125A Microwave EMI Measurement System (don't know the price). This unit spans 1-18 GHz. The sales literature indicates a sensitivity of 10-20 dB below the FCC limit in this frequency range (assuming a horn antenna and "typical" spectrum analyzer transducer factors (something like the HP 8593EM). If you investigate this option, please let me know what you find. Jim ________________________________________________________ Dr. Jim Knighten e-mail: [email protected] <mailto:[email protected]> Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com <http://www.ncr.com> Tel: 858-485-2537 Fax: 858-485-3788 ***** Notice the Area Code change from 619 ***** -----Original Message----- From: Price, Ed [mailto:[email protected]] Sent: Wednesday, August 25, 1999 3:41 PM To: 'John Cronin'; [email protected] Subject: RE: Amplifier for measurements above 1GHz John: So you need another 10dB of gain between 1 & 5 GHz. I have used Miteq low-noise preamps in the past, but I bought octave-band models and I paid a lot extra for absolute lowest noise figure with about 35dB of gain. I suggest you call Miteq (get the noise figure of your spectrum analyzer first) and see what combinations they recommend. You might need only a 1dB noise figure, with about 20dB of gain, which may mean they have one unit that can span the frequency range. Site at: http://www.miteq.com :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) > -----Original Message----- > From: John Cronin [SMTP:[email protected]] > Sent: Wednesday, August 25, 1999 2:50 PM > To: [email protected] > Subject: Amplifier for measurements above 1GHz > > > I am hoping to purchase a 1 to 5 Ghz amplifier to be used in conjunction > with a spectrum analyzer to measure emissions at 3m to FCC requirements. > With a 1 MHz bandwidth into a HP microwave analyzer we can only currently > measure at 1m. > > Can we get away with measurements at 1m? > > Can anyone recommend a low cost microwave amplifier that is suitable for > the > task? > > Thanks in anticipation of your response. > > > John Cronin > > > ______________________________________________________ > Get Your Private, Free Email at http://www.hotmail.com > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
