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- Path: sparky!uunet!spool.mu.edu!tulane!theozone!gerald.belton
- From: gerald.belton@ozonehole.com (Gerald Belton)
- Newsgroups: sci.electronics
- Subject: Structural interference f
- Message-ID: <1351.442.uupcb@ozonehole.com>
- Date: 21 Jan 93 15:58:00 GMT
- Distribution: world
- Organization: The Ozone Hole - SKYDIVE New Orleans! - (504)891-3142 16,800 bps
- Reply-To: gerald.belton@ozonehole.com (Gerald Belton)
- Lines: 43
-
- >I work in a computer lab in an interior room on the 4th out of 4 floors.
- >My radio picks up FM fine but AM does not come in at all unless I move to a
- >outer room.
-
- >Moving the antenna makes little difference and is 72 inches long.
- >I tried running a wire from the ground plug of an outlet to the antenna but
- >it did not help. Why didn't this work? I figured the ground wiring would ac
- >as a giant antenna..................... Does it have to do with the geometr
- >of the antenna with the flux normal to the surface generated as I assume is
- >the case with UHF and VHF television antennas?
-
- > My question is how do I get reception? Can I buy a signal amplifier for
- > a radio?
-
- My office is on the fourth of nine floors. I have the same problem.
-
- First of all, connecting ANYTHING to the whip antenna on your radio
- isn't going to help. The whip antenna is for FM reception. The AM
- antenna is a coil of wire wrapped around a ferrite core inside the
- radio.
-
- I purchased a small shortwave receiver from Radio Shack. I have found
- that it picks up AM stations much better than the cheap clock radio I
- was using before. I imagine this is because of a more sensitive
- receiver. I get a lot of noise from my computer, though. I have found
- that be rotating the entire radio and moving it around the room I can
- find spots and angles where the noise is minimized, but not completely
- eliminated. Since you are in a computer lab, there is probably much
- more noise than my single computer generates.
-
- There are external active antennas that will improve reception of weak
- signals, but they also amplify the noise. I would think that in a
- computer lab the interfering signals would be the limiting factor rather
- than the weak signal strength of the desired stations.
-
- ---
- . SLMR 2.1 . Nothing is so smiple that it can't get screwed up.
-
- ----
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