Aircraft VOR (vhf omni-range) frequencies are from 108-118 MHz. Aircraft COMM to tower 116-152 MHz. Glideslope signal is 329-335 MHz. Marker Beacon is at 75 MHz. DME is 960-1215 MHz.
These have been around forever. There may be newer stuff I haven't listed. Ken Javor Phone: (256) 650-5261 > From: Gert Gremmen <[email protected]> > Date: Thu, 15 Jan 2009 07:17:18 +0100 > To: Michael Heckrotte <[email protected]>, Frank Krozel > <[email protected]>, <[email protected]>, > <[email protected]> > Conversation: Anechoic chambers: risks of energy leaking out > Subject: Anechoic chambers: risks of energy leaking out > > Right. > > But still reduces the screening > of your chamber from 100 dB or so > to 30...40 and thus may cause problems > with immunity testing. > > That brings me to a related subject: > > The risks that go with RF energy leaking out. > > Well if you are in the middle > of Texas, that may not be such a problem. > > But my chamber is located precisely below > the landing path of Rotterdam airport, > and civil aircrafts like B737 fly approx. 150m (500ft) above it. > > Any idea what may happen, if a substantial amount > of the right frequency leaks out at the right (?!?) > moment ? > > Well, in fact I don't know. > > Is there someone on this list with > pertinent data on this subject ?? > Someone that can provide risk frequencies ? > > Gert Gremmen > > -----Oorspronkelijk bericht----- > Van: [email protected] [mailto:[email protected]] Namens Michael > Heckrotte > Verzonden: donderdag 15 januari 2009 3:26 > Aan: Frank Krozel; [email protected]; [email protected] > Onderwerp: RE: Anechoic Chamber: Pass-through on hydraulic lines > > All, > > As was stated some months or years ago on this list regarding this same > topic: > > The waveguide pipe is an outer conducter, the wire going through it is a > center conductor, and the combination of insulation/air is a dielectric; > this configuration is also known as a coaxial cable = transmission line. > > If you absolutely must feed a wire or an ungrounded coax into a chamber, > and the wire or coax ground cannot be filtered, then feed the wire or > coax through two absorbing clamps, one inside the chamber and one > outside the chamber. Place an absorbing clamp at each end of the > waveguide pipe, butted up as close as possible to the waveguide pipe. > This is effective over the frequency range at which the absorbing clamps > provide decent common-mode decoupling. > > Best Regards, > Mike > > Michael Heckrotte > Director of Engineering > > Compliance Certification Services > 47173 Benicia Street, > Fremont, CA 94538 > > Main: (510) 771-1000 > Direct: (510) 771-1121 > Fax: (510) 661-0885 > > [email protected] > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Frank > Krozel > Sent: Wednesday, January 14, 2009 6:25 AM > To: [email protected] > Subject: Re: Anechoic Chamber: Pass-through on hydraulic lines > > All, > Tim's comment made me think. In the past, I have seen hydraulic lines > passed through waveguide feed-thrus that have re-inforced metal braid. > Be aware of this if you need to pass hydraulic lines into your chamber > or RF shielded enclosure. Alternatives do exist that are > non-conductive. > > Regards Frank Krozel > http://www.electronicinstrument.com > > > ----- Original Message ----- > From: Haynes, Tim (SELEX GALILEO, UK) > To: [email protected] > Sent: Wednesday, January 14, 2009 6:26 AM > Subject: RE: Anechoic Chamber: Pass-through vs. Bulkhead > > > Hi All, > > Conventional wisdom is, as stated, to bond the shield of a cable, > hydraulic > pipe, or any other electrically conductive - non-energised item that > penetrates the shield wall. This is usually done with a purpose made > "bulkhead" connector and is, again, usually done at a purpose made > access > plate in the shield room wall. > > Energised items cannot be connected to the shield and here the > conventional > wisdom is to connect the energised conductor via a filter that has its > local > ground connected to the shield wall. > > However, it might be acceptable to use a pass-through pipe where the > pipe is > long and can provide a sufficiently high capacitance to ground to form a > > functional filter at the frequencies of concern. The capacitance might > be > increased by "stuffing" the pass through pipe with conductive wire > wool. > > I once had no option but to "pass through" a cable into the chamber. The > > project allowed me to remove the outer insulation at the pass through > and I > bonded the cable shield to the screened room by using a bolt to apply > pressure to a shim of metal that held the cable firmly to the metal of > the > pass through pipe. That worked well. > > I hope the information helps. > > Regards > Tim > > ************************ > Tim Haynes A1N10 > Electromagnetic Engineering Specialist > SELEX Sensors and Airborne Systems > 300 Capability Green > Luton LU1 3PG > ( Tel : +44 (0)1582 886239 > 7 Fax : +44 (0)1582 795863 > ) Mob : +44 (0)7703 559 310 > * E-mail : [email protected] > P Please consider the environment before printing this email. > > There are 10 types of people in the world-those who understand binary > and > those who don't. J. Paxman > > SELEX Sensors and Airborne Systems Limited > Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex > > SS14 3EL > A company registered in England & Wales. Company no. 02426132 > ******************************************************************** > This email and any attachments are confidential to the intended > recipient and may also be privileged. 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To post a message to the list, send your > e-mail to <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that > URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
