[Antennas] 468/Freq in Mhz

Mon Aug 24 09:14:30 EDT 2009

If you re-read MY post, I said exactly what YOU said...BUT I was disagreeing with the statement a fatter antenna radiates better than a thin antenna..THAT IS incorrect..size (ACROSS, not length) does NOT affect radiation prefermonce..it only affects Q and BANDWIDTH
Chris
WB5ITT
-----Original Message-----
>From: Alex Eban <alexeban at gmail.com>
>Sent: Aug 24, 2009 3:18 AM
>To: 'Chris Boone' <Cboone at earthlink.net>, 'rbethman' <rbethman at comcast.net>, antennas at mailman.qth.net
>Cc: 'Jerry' <n6vg at lanset.com>
>Subject: Re: [Antennas] 468/Freq in Mhz
>>NO!
>The ratio of conductor diameter to the element length is important: it
>influences the bandwidth of the antenna. Also, for fat elements, the antenna
>is shorter.
>In the older antenna handbooks there were tables indication the percent
>shortening required, relative to the length/diameter ratio.
>Alex	4Z5KS
>>-----Original Message-----
>From: antennas-bounces at mailman.qth.net
>[mailto:antennas-bounces at mailman.qth.net] On Behalf Of Chris Boone
>Sent: Sunday, August 23, 2009 9:14 PM
>To: 'rbethman'; antennas at mailman.qth.net
>Cc: 'Jerry'
>Subject: Re: [Antennas] 468/Freq in Mhz
>>Incorrect......size (width) has nothing to do with performance!!!! (NO
>joke!)....#14 wire will radiate as well as tubing...only the Q will be lower
>and BANDWIDTH will be lower...but a wire antenna has a B/W of 10% of so of
>freq..so the higher you go, the wide the bandwidth of the antenna (say a
>normal 1/4wave gnd plane) BUT there is NO performance improvement....
>>Skin Effect is how RF travels on ANY conductor.....this tubing is no
>different than wire..its just the solid wire vs tubing of the same size is
>wasted material in the center..that MATTERS on DC or low freq AC like
>60HZ..but RF is does not care about the inside of the conductor.
>>Chris
>WB5ITT
>PG-9-5322 FCC Commercial RadioTelephone (originally issued 1974)
>>-----Original Message-----
>From: antennas-bounces at mailman.qth.net
>[mailto:antennas-bounces at mailman.qth.net] On Behalf Of rbethman
>Sent: Sunday, August 23, 2009 1:04 PM
>To: antennas at mailman.qth.net
>Cc: Jerry
>Subject: Re: [Antennas] 468/Freq in Mhz
>>Jerry,
>>Generally, yes. In specific applications that are also frequency 
>dependent, the higher the frequency the better the aluminum tubing will 
>perform because of skin effect.
>>In the instance of 160 through 10mtrs, you will probably do okay with 
>the #14. I always cut a bit longer to begin with and trim to where I 
>want resonance by test.
>>Above 10mtrs, the tubing will out perform the #14.
>>Bob - N0DGN
>>Jerry wrote:
>> Hi out there,
>> Is the subject formula good for both #14 wire and 1 inch
>> diameter aluminum tubing? If not, please elaborate.
>> Thank you. Jerry N6VG
>>>>______________________________________________________________
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