Subject:
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Re: EE RF question
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 4 Aug 1999 22:23:13 GMT
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Original-From:
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MAR ERICSON <mar@cooper&AvoidSpam&.edu>
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Viewed:
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1241 times
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Yes,
that is what I'm trying to do. I think that this would eliminate
interferance. Though the price is tethered operation. I guess it
doesn't really have to be a coax. It can just be an RCA A/V cable right?
Or how about a single wire!
-----------
ericson mar
Robotics Consultant
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Tue, 3 Aug 1999, Jose-Afredo D. Esguerra wrote:
> Pherd,
>
> It sounds as though he is planning on patching the output of a RF
> transmitter to the input of a RF receiver.
>
> 73's,
>
> Jose
>
>
>
>
>
> -----Original Message-----
> From: FThompson9@aol.com <FThompson9@aol.com>
> To: handyboard@media.mit.edu <handyboard@media.mit.edu>
> Date: Tuesday, August 03, 1999 7:41 PM
> Subject: Re: EE RF question
>
>
> > In a message dated 8/2/99 7:38:41 PM Central Daylight Time, mar@cooper.edu
> > writes:
> >
> > >
> > > If you have an RF Transmitter and Receiver with Antennas, can you detach
> > > the antennas and just connect a co-ax cable between them? I'm guessing
> > > this would reduce the noise and interferance to a minumum. Is this • right?
> > >
> > >
> >
> > I'm not to clear on what you are describing here. Generally speaking I • would
> > say yes, you can slap a piece of coax in without too much loss of function.
> > But you really need to know what type of antenna your feeding, the radio's
> > frequency, the impedance expected at the terminal by the
> > transmitter/receiver. If you wish to read up on it, I suggest going to • your
> > local library and finding a book call "The 19xx ARRL Handbook for radio
> > amateurs" (where xx is the year of your choice). This book gives you • enough
> > information to design your own radios and antennas.
> > If the antennas in questions are just "rubber ducks" (short whip
> > antennas), I wouldn't worry too much about the feeding system. Just about
> > any antenna system is better than a rubber duck. The ones that I have seen
> > are just resistors with slightly longer than normal feed lines. Yet these
> > tiny devices can be found on a large number of radios communicating over • long
> > distances.
> >
> > Hope this helps,
> > Pherd
>
>
>
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Message is in Reply To:
 | | Re: EE RF question
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| Pherd, It sounds as though he is planning on patching the output of a RF transmitter to the input of a RF receiver. 73's, Jose -----Original Message----- From: FThompson9@aol.com <FThompson9@aol.com> To: handyboard@media.mit.edu (...) (25 years ago, 4-Aug-99, to lugnet.robotics.handyboard)
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