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5113RE: [BCD396XT] Indoor Antenna

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  • Lance Star
    Feb 1, 2011
      If that was the case then I would not be able to recieve signals from a yagi antenna using a omni-directional antenna...

      In the same light, a Southwest Jet flying at Flight Level 430 transmitting from the lower dorsal fin antenna to my handheld with a
      vertically upright oriented antenna would not recieve signals based on theory of reciprocal...

      I think for this person he needs more surface area to recieve signals if "line of site" , "point to point" simplex coms is what he is interested in.

      If he was just listening to police/fire/ambulance dispatch that would not take much of an antenna with repeater TX power being 50-100 watts
      not to mention the ERP when one adds the gain of the antenna. In some cases that could be up around 12 dB or more.

      I can recieve San Francisco PS Trunk System with a bnc stub antenna (about 1/4") long, used for Indy Races as an example.

      At least our friend has a frige to act as a groundplane. Although Mag mount antennas are capacitively coupled...







      ----- Original Message -----
      From: "Michael Hopkins" <mhopkins735@...>
      To: <BCD396XT@yahoogroups.com>
      Date: Tue, 1 Feb 2011 14:01:13 -0500
      Subject: RE: [BCD396XT] Indoor Antenna

      >
      > Yeah, but transmitting and receiving patterns are typically reciprocal --- a directional transmitting antenna will also be a directional receiving antenna…. Some metal in the way of a transmitting signal is also in the way with a signal coming in to be received…
      >
      > Michael
      >
      > From: BCD396XT@yahoogroups.com [mailto:BCD396XT@yahoogroups.com] On Behalf Of Lance Star
      > Sent: Tuesday, February 01, 2011 12:23 PM
      > To: BCD396XT@yahoogroups.com
      > Subject: RE: [BCD396XT] Indoor Antenna
      >
      > "because the antenna’s major radiating (and receiving) pattern will be slightly below the horizon and your air duct would block some of that."
      >
      > He is not transmitting here in this case...
      >
      > ----- Original Message -----
      > From: "Michael Hopkins" <mhopkins735@... <mailto:mhopkins735%40charter.net> >
      > To: <BCD396XT@yahoogroups.com <mailto:BCD396XT%40yahoogroups.com> >
      > Date: Tue, 1 Feb 2011 06:56:53 -0500
      > Subject: RE: [BCD396XT] Indoor Antenna
      >
      > >
      > > Why not ?? should work fine for most local stuff, but any signals coming in from a higher angle could be significantly reduced (air traffic, for example) because the antenna’s major radiating (and receiving) pattern will be slightly below the horizon and your air duct would block some of that. Most aircraft have antennas mounted on the bottom of the fuselage so they radiate best down and out; antennas at the airfield and other locations have them pointed up so the radiation is up and away.
      > >
      > > Hope that helps. --- (Can you get the antenna on TOP of the ceiling someplace??)
      > >
      > > Michael
      > >
      > > From: BCD396XT@yahoogroups.com <mailto:BCD396XT%40yahoogroups.com> [mailto:BCD396XT@yahoogroups.com <mailto:BCD396XT%40yahoogroups.com> ] On Behalf Of robdutka@... <mailto:robdutka%40comcast.net>
      > > Sent: Monday, January 31, 2011 8:39 PM
      > > To: BCD396XT@yahoogroups.com <mailto:BCD396XT%40yahoogroups.com>
      > > Subject: Re: [BCD396XT] Indoor Antenna
      > >
      > > Another idea.... I used a magnetic mount to the ceiling air duct right in front of the window and have the antenna hang upside down. Looks funny, but it works.
      > >
      > > I'm not a RF guy so this might not be the best solution, but it works better than the small antenna on the scanner.
      > >
      > > ----- Original Message -----
      > > From: "thestreetdisciples" <canadawalrus@... <mailto:canadawalrus%40gmail.com> <mailto:canadawalrus%40gmail.com> >
      > > To: BCD396XT@yahoogroups.com <mailto:BCD396XT%40yahoogroups.com> <mailto:BCD396XT%40yahoogroups.com>
      > > Sent: Monday, January 31, 2011 6:32:09 PM
      > > Subject: [BCD396XT] Indoor Antenna
      > >
      > > this may be a stupid question but, I live in an apartment with no balcony and i am wondering if a magmount antenna on the fridge would pick up more than just the normal antenna and if so is there much difference. I appreciate all your expertise
      > >
      > > Thanks
      > >
      > > Steve
      > >
      > > canadawalrus@... <mailto:canadawalrus%40gmail.com> <mailto:canadawalrus%40gmail.com>
      > >
      > > [Non-text portions of this message have been removed]
      > >
      > > [Non-text portions of this message have been removed]
      > >
      > >
      > >
      >
      > [Non-text portions of this message have been removed]
      >
      >
      >
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