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Hi shockwave,

I don't doubt your claims of maximum gain arising at .82 of a wavelength.What I would like to know is you say that .82 is only slightly shorter than the original vector 4000,by my calculations at 27.185 .82 is almost 2 foot shorter,1 ft 9 1/2 inches to be precise.

I'm wondering if you figured in the .95 vf of aluminium in your wavelength calculation as without it .82 would only be a couple of cm shorter than the original 7/8 wave (.875 wave) vector 4000 and indeed qualify as only slightly shorter,or if you have figured it in and you are quantifying 2ft as slighly?

I ain't nitpicking just trying to understand the term slightly.

The reason I don't doubt your claims is despite sirio claiming their new vector 4000 to be a 3/4 wave j pole,if you calculate from the 8480mm they give for the length it is in fact .81 wave in length at 27.185.which supports your claims as i know from experience when it comes to antennas sirio ain't no mugs.

I believe they only use the 3/4 j pole description to sell them to people who can't get their heads round the concept that an antenna doesn't have to be an exact fraction of a wavelength to work well and that they will never understand that it isn't a j pole but a coaxial antenna.Shrewd marketing.

I use 27.185 as it tends to be where you guys over the pond centre your antennas on,here it would be slightly higher in most cases as antennas of that nature are generally used for freebanding here around 27.555.

So as you can see i am in no way rubbishing your claims,just looking for you to clarify the "slightly shorter quantity".

<blockquote data-quote="jazzsinger" data-source="post: 155801" data-attributes="member: 7426">Hi shockwave,&nbsp; I don&#039;t doubt your claims of maximum gain arising at .82 of a wavelength.What I would like to know is you say that .82 is only slightly shorter than the original vector 4000,by my calculations at 27.185 .82 is almost 2 foot shorter,1 ft 9 1/2 inches to be precise. I&#039;m wondering if you figured in the .95 vf of aluminium in your wavelength calculation as without it .82 would only be a couple of cm shorter than the original 7/8 wave (.875 wave) vector 4000 and indeed qualify as only slightly shorter,or if you have figured it in and you are quantifying 2ft as slighly? I ain&#039;t nitpicking just trying to understand the term slightly.&nbsp; The reason I don&#039;t doubt your claims is despite sirio claiming their new vector 4000 to be a 3/4 wave j pole,if you calculate from the 8480mm they give for the length it is in fact .81 wave in length at 27.185.which supports your claims as i know from experience when it comes to antennas sirio ain&#039;t no mugs. I believe they only use the 3/4 j pole description to sell them to people who can&#039;t get their heads round the concept that an antenna doesn&#039;t have to be an exact fraction of a wavelength to work well and that they will never understand that it isn&#039;t a j pole but a coaxial antenna.Shrewd marketing. I use 27.185 as it tends to be where you guys over the pond centre your antennas on,here it would be slightly higher in most cases as antennas of that nature are generally used for freebanding here around 27.555. So as you can see i am in no way rubbishing your claims,just looking for you to clarify the &quot;slightly shorter quantity&quot;.</blockquote>

[QUOTE="jazzsinger, post: 155801, member: 7426"] Hi shockwave, I don't doubt your claims of maximum gain arising at .82 of a wavelength.What I would like to know is you say that .82 is only slightly shorter than the original vector 4000,by my calculations at 27.185 .82 is almost 2 foot shorter,1 ft 9 1/2 inches to be precise. I'm wondering if you figured in the .95 vf of aluminium in your wavelength calculation as without it .82 would only be a couple of cm shorter than the original 7/8 wave (.875 wave) vector 4000 and indeed qualify as only slightly shorter,or if you have figured it in and you are quantifying 2ft as slighly? I ain't nitpicking just trying to understand the term slightly. The reason I don't doubt your claims is despite sirio claiming their new vector 4000 to be a 3/4 wave j pole,if you calculate from the 8480mm they give for the length it is in fact .81 wave in length at 27.185.which supports your claims as i know from experience when it comes to antennas sirio ain't no mugs. I believe they only use the 3/4 j pole description to sell them to people who can't get their heads round the concept that an antenna doesn't have to be an exact fraction of a wavelength to work well and that they will never understand that it isn't a j pole but a coaxial antenna.Shrewd marketing. I use 27.185 as it tends to be where you guys over the pond centre your antennas on,here it would be slightly higher in most cases as antennas of that nature are generally used for freebanding here around 27.555. So as you can see i am in no way rubbishing your claims,just looking for you to clarify the "slightly shorter quantity". [/QUOTE]

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