My first guess would be the antenna factors (esp. with a bicon or biconolog)- then I would check the antennas themselves maybe one has a faulty balun - then I Wwould ensure that I have ferrites on the Xmt and Rcv cables - do you have the 6db pads (for a bicon?) - my next guess would be (assuming a 3m measurement)near field coupling between Xmt and Rcv antennas. (Typically its much easier to meet site attenuation horizontally that vertically.)
Phew!! Looks like interesting work to me.. From: John Harrington To: [email protected] Sent: 9/18/2003 1:05 PM Subject: NSA fun Hello All I'm having some fun with an NSA measurement. I get a swing of 8dB between 30MHz and 45MHz horizontally polarized. At 30 MHz I get too little attenuation (i.e. I receive too much of the transmitted signal) and at 45MHz too much attenuation. The rest of the frequency range is good within +/-2dB and the Vertical polarization is good at all frequencies. Are there any OATS Gurus out there who could shed some light on this or at least suggest an illuminating text? Thanks John Harrington This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
