I am not sure if you are asking for specific equipment model numbers, or general guidance. I will leave the specifics to others. I would start with a high gain horn and a calculation of how far away the far field is developed (2D^2/wavelength). You can use the equation for power density as a function of gain, transmitted power and distance to figure out how much power you need at 1 meter or 2D^2/wavelength. Then you go looking for that TWT power amp. The reason for this approach is that those amps are expensive and hard to find. I don't know if you could rent one at all. If you could find a 1 Watt TWTA, that would work as long as you are satisfied with 2D^2/lambda and not aiming for 1 meter. Also the horn bolts directly to the TWTA waveguide output. You probably can't stand the loss of interconnect between signal generator and amp, unless you plumb the whole thing with rigid waveguide, which would be painful. I recommend the test operator be right in the room with the test sample. I bet I'll draw some flack for that, but that beam is so directional I wouldn't worry about it. If you are worried about it, build a bunker house out of spare foam absorber. Also if you are very close to the EUT there are a couple issues. One is VSWR, you don't want reflected power splashed back into the horn, so you cant the angle slightly (angle of incidence equals angle of reflection) so that the reflected beam is diverted from the horn aperture. A second issue is that with a small illumination spot size you have to have a lot of antenna positions to paint the entire test set-up. MIL-STD-5461E covers that. if you were going to do this all the time it would be worthwhile to plunk down $150K for the 40 Watt amp and get a lower gain horn back at 1 meter and spray the whole test set-up to save time. Like everything else, that decision comes down to time or money.
> From: Bill Stumpf <bstu...@dlsemc.com> > Reply-To: Bill Stumpf <bstu...@dlsemc.com> > Date: Tue, 4 Nov 2003 14:21:20 -0800 > To: "'emc-p...@majordomo.ieee.org'" <emc-p...@majordomo.ieee.org> > Subject: RS-103 help > > > Hello all. I need help locating equipment for rent that can achieve the > following goals. RS-103 (MIL-STD-461E) testing from 18 GHz to 40 GHz @ > 200V/m. If anyone could point me in the right direction I would be most > grateful. > > Bill Stumpf > > William M Stumpf > DLS Electronics > 166 South Carter St. > Genoa City WI 53128 > ph: 262-279-0210 > fx: 262-279-3630 > email: bstu...@dlsemc.com > > ------------------------------------------- > 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: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: emc_p...@symbol.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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
