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#359494 - 11/27/11 04:15 PM Stupid trivia question....
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 11444
Loc: Central NH
For some reason, I started thinking about CB radios. I was into them at the start of the craze in the 7os.

For the life of me, I can't remember what the name was for directional, base station antennas. There were some phenomenally big antennas by Wilson, and the MoonRaker series was popular.

But for the life of me, I can't remember what the name was for directional antennas in general.

Randy or Rick?
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#359501 - 11/27/11 09:16 PM Re: Stupid trivia question.... [Re: MarkSJohnson]
JohnK Offline
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Registered: 05/11/02
Posts: 10634
Mark, I don't know anything about CB radio, but if "directional" isn't the generic term, I'd think that something like "narrow beam" would be synonymous.
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#359502 - 11/27/11 09:34 PM Re: Stupid trivia question.... [Re: JohnK]
Ken.C Offline
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Registered: 05/03/03
Posts: 18044
Loc: NoVA
Beam antennas?
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#359503 - 11/27/11 09:38 PM Re: Stupid trivia question.... [Re: Ken.C]
St_PatGuy Offline
axiomite

Registered: 03/07/05
Posts: 7463
Loc: Glendale, Arizona
Laser beam?



Sorry. . .
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#359506 - 11/27/11 09:46 PM Re: Stupid trivia question.... [Re: Ken.C]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 6138
Loc: Bowmanville, Ontario, Canada
Yagis (plural of Yagi, not pronounced like haggis) ? Or was that just for TV antennas ?


Edited by bridgman (11/27/11 09:47 PM)
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#359513 - 11/27/11 11:13 PM Re: Stupid trivia question.... [Re: bridgman]
CatBrat Offline
axiomite

Registered: 08/05/09
Posts: 6015
Loc: Milky Way Galaxy
Moon Rakers?

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#359524 - 11/28/11 06:39 AM Re: Stupid trivia question.... [Re: CatBrat]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1291
Loc: Quebec, Canada
Yagi antennas are a specific type of antenna construction.
you take a dipole antenna and multiply that by 2 or more, all mounted on a pole, one element in front of the other.

they look like herringbone and the more elements, the more narrow the beam is, and the more gain.

i remember seeing those large directional antennas on some roofs, and they were very large because of the frequencies involved:
a half wave is around 18 Ft.

some parabolic antennas are a kind of cousin of those Yagis;
they have a halfwave dipole and behind them a huge reflector to direct the waves to the dipole, like a very large optical magnifier concentrating light in a very small spot.

CB'ers also used another kind of high gain antenna, but i can't remember the name.
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#359525 - 11/28/11 06:56 AM Re: Stupid trivia question.... [Re: J. B.]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 11444
Loc: Central NH
I think Ken has got it. Though there wasn't an "AHA! That's IT!" moment, I think they were commonly just called "Beams" and that's what I was trying to come up with.

Ken wins a surprise in the (snail) mail.
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#359527 - 11/28/11 07:49 AM Re: Stupid trivia question.... [Re: MarkSJohnson]
Murph Offline
axiomite

Registered: 10/05/06
Posts: 6955
Loc: PEI, Canada
Are you getting another one? I just gave one away that used to be in my Jeep. We still used them to communicate between vehicles on trail runs.

If you are still interested in radios, HAM radios seem to be increasing in popularity again. Lots of licenses are still available, due to the prior decline in popularity, at least in Canada anyway. Personally, I don't get it. Unless you like to lurk, the Internet has provided much easier and a 'bit' more private means of long distance communications. Still, I can see it being a valid hobby if it is in a persons interests.
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#359547 - 11/28/11 10:58 AM Re: Stupid trivia question.... [Re: MarkSJohnson]
BobKay Offline
connoisseur

Registered: 03/23/10
Posts: 3596
Loc: Massachusetts Badlands
Directional Antennas
An antenna is known as "directional" if its pattern strongly favors a certain direction. A directional works by concentrating the signal in one direction at the expense of other directions. It is also commonly referred to as the "Beam" antenna. I am going to start with the earliest type of beam discovered, the "Yagi" Beam. This type of beam was discover by Professor Uda but the english translation was done by Hidetsuga Yagi. This design goes back to the 1920s! One would think today there would be better designs. I believe there is, and that's why I am so interested in antennas!

Don't mention it.
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