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- Path: sparky!uunet!hayes!bcoleman
- From: bcoleman@hayes.com (Bill Coleman)
- Newsgroups: rec.models.rc
- Subject: Re: Anybody with experience in 2IM problems please contact me by email
- Message-ID: <5874.2a8bc3b9@hayes.com>
- Date: 14 Aug 92 14:31:21 EDT
- References: <1992Aug06.183610.2984@bmerh85.bnr.ca> <seanm.12eq@terapin.com>
- Organization: Hayes Microcomputer Products, Norcross, GA
- Lines: 32
-
- In article <seanm.12eq@terapin.com>, seanm@terapin.com (Sean McCaskey) writes:
- > About your 2IM problem..... Isn't it also true that if the tx's are 20feet or
- > more apart that this is not a problem? Our field is a dual conversion only
- > field, so I suppose we would have no problems anyhow.
-
- I had somebody rush up to me a the flying field a few weeks ago and tell
- me I was too close to another flyer. I moved, but I asked him about it. He
- said something about being too close to another transmitter caused some kind
- of intermod.
-
- Well, knowing considerably more about radio than he, I knew that intermod
- (intermodulation distortion) is a receiver phenomenon. But this guy swore
- that he had seen problems caused when two transmitters got within 20 feet.
- I believed him, but seriously doubted it was due to intermod.
-
- I theorised that when transmitters get too close, they tend to pick up
- each others' transmitted signals in their internal circuitry. This could
- introduce noise in the transmitted signals from each, which would cause
- the planes to glitch. (Even FM or PCM, since the noise could be in the
- wiring from the potentiometers for the joysticks)
-
- So, regardless of the type of receiver used, perhaps it is a good idea to
- maintain separation of transmitters, just as a precaution.
-
- --
- Bill Coleman, AA4LR ! CIS: 76067,2327 AppleLink: D1958
- Principal Software Engineer ! Packet Radio: AA4LR @ W4QO
- Hayes Microcomputer Products, Inc. ! UUCP: uunet!hayes!bcoleman
- POB 105203 Atlanta, GA 30348 USA ! Internet: bcoleman%hayes@uunet.uu.net
- Disclaimer: "My employer doesn't pay me to have opinions."
- Quote: "The same light shines on vineyards that makes deserts." -Steve Hackett.
-
-