[Antennas] Re: Antennas digest, Vol 4 #90 - 3 msgs

2003年3月29日 21:55:29 +0000

Hello I am overseas in the Gulf and had the chance to view the nice antenna 
farm in Bahrain. Lots of Log Periodics and verticals. Made me wish I had an 
antenna farm like that.
 73's from
 Larry Fields,n6hpx/mm
 n6hpx/du1
>From: [email protected]
>Reply-To: [email protected]
>To: [email protected]
>Subject: Antennas digest, Vol 4 #90 - 3 msgs
>Date: 2003年3月28日 04:01:16 -0500 (EST)
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>>>Today's Topics:
>> 1. All band vertical (Jim Isbell)
> 2. Re: Antennas in Iraq (Deon Erwin)
> 3. Re: Antennas in Iraq (A10382)
>>--__--__--
>>Message: 1
>Date: 2003年3月27日 09:31:54 -0600
>From: Jim Isbell <[email protected]>
>To: [email protected]
>Subject: [Antennas] All band vertical
>>I have been looking over an elevated-feed vertical that covers 80 to 10
>meters that I found in The Giant Book of Electronics Projects which was
>published by the editors of 73 magazine. Does anyone have any
>experience with this particular design. Is it a good antenna, are there
>problems with it? It looks like just the thing I need at this QTH.
>>My situation is that I am sitting on top of a sand dune that puts me 47
>feet above sea level on the highest point on the gulf coast between the
>Mexican border and the Mississippi river. It is an unobstructed
>location in any direction. Next to the house I have a 32 foot telephone
>pole that I use for antenna mounting. Being on the coast I do not want
>to use a beam since in a hurricane it would present too much wind
>resistance. The elevated-feed vertical seems like a great minimum
>resistance antenna.
>>In looking at the design article I think I can see some improvements
>that should be made. The matching box at the base of the antenna just
>isn't interesting to me since I might have to change settings during a
>hurricane. So I want to put the matching box at the feed point (which
>also eliminates .25 db loss) and make it automated..that is, motor
>operated capaditors or relay operated switching,,,or something along
>those lines.
>>OR, and this is a question that may show my inexperience in antenna
>design, can I feed it with a 120 (approx) foot length of coax so that,
>at least on 80,40,20,and 10 meters it will be a multiple of one wave
>length and then use a tuner at the transmitter?
>>>--__--__--
>>Message: 2
>Reply-To: "Deon Erwin" <[email protected]>
>From: "Deon Erwin" <[email protected]>
>To: "Reflector Antenna" <[email protected]>
>Subject: Re: [Antennas] Antennas in Iraq
>Date: 2003年3月26日 22:02:15 +0200
>>My wife saw the one of the vehicles covered with antennas in the advancing
>column and said: "Look, the bloody Hams are everywhere."
>>Deon ZR1DQ
>>----- Original Message -----
>From: "A10382" <[email protected]>
>To: "Antenna reflector list" <[email protected]>
>Sent: Wednesday, March 26, 2003 9:42 AM
>Subject: [Antennas] Antennas in Iraq
>>>: For those of you watching the war news on the cable channels, see how 
>many
>: antenna types you can identify... they're everywhere.
>:>: > HF verticals on trucks, APCs/Bradleys, and Tanks
>: (in WWII, only the commander's tank or track had multiple antennas.
>>>--__--__--
>>Message: 3
>From: "A10382" <[email protected]>
>To: "Antenna reflector list" <[email protected]>
>Subject: Re: [Antennas] Antennas in Iraq
>Date: 2003年3月27日 16:51:29 -0500
>>I've also been noticing the crank-up quads (usually two per vehicle) on a
>few of the US APCs. There seems to be a total of 4 verticals and the two
>quads on each vehicle... Quad elements Set parallel to the vehicle while
>underway but raised (and rotated?) when stationary. Looks like about 
>12-15'
>per leg - so about 48-60' per element or something like the 15-20 M bands
>??
>>The 'Information' War has arrived. Next, I'm expecting someone to startup
>an "ALL WAR - ALL THE TIME" cable channel. Currently, there are quite a 
>few
>countries with almost daily) military actions underway - including on-going
>civil wars.
>>Iraq
>Afghanistan
>The Philippines
>Sierra Leone
>Central African Republic
>Sri-Lanka
>US-Mexican border area (yup -- shooting and all)
>Columbia
>Bolivia
>Venezuela (on the verge of a new civil war ?)
>Israel and the occupied territories of Gaza and the West Bank
>Indonesia
>Pakistan-Afghan border area
>Kashmir Province of India (or Pakistan, depending on your political view)
>Bosnia
>North-South Korea border area
>Myanmar (previously, Burma)
>Chechen republic (Chechnya)
>>-- and others --
>> ==================
>>>>----- Original Message -----
>From: "Deon Erwin" <[email protected]>
>To: "Reflector Antenna" <[email protected]>
>Sent: Wednesday, March 26, 2003 3:02 PM
>Subject: Re: [Antennas] Antennas in Iraq
>>> > My wife saw the one of the vehicles covered with antennas in the 
>advancing
> > column and said: "Look, the bloody Hams are everywhere."
> >
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>>>End of Antennas Digest

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