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I can't explain Alexis, I can only try and remember the experiences I had with my S4 some years ago.

I was given the S4 by a long time local friend named Bill. Bill got it from another friend, and it was a "demo" installed at his CB business back in the days when Antenna Specialists was promoting their new Sigma 4 antenna.

It was laying in Bill's back yard in 2 pieces, but otherwise it was fully assembled. I took it home and added the top section to the bottom section, and the match was good on a 5' testing mast.

So, I raised it up to about 20'-25' feet, worked it for a while, and got a few very good responses (unsolicited signal reports).

When it was low to the ground it messed up some electronics at my house, but on raising the RFI went away for me. I also had no complaints from neighbors...like I'd had with some other antennas back around that time, so I was aware of interference back then in a very primitive sorta' way.

I found the antenna match to be very steady on raising. I never did a lot of testing on it up higher, because it was so tall. I also recall the bandwidth was a lot less compared to my SD, A99, Imax, CLR2, and possibly a few others.

So, I cannot explain the very broad-bandness you've reported above. I also know that Sirio reports their NV4K showing about 1.4 MKz <2.00:1 SWR bandwidth plus the gamma on my S4 was physically very small...so I figured that had some limiting effects on tuning range too.

I never owned a Sirio, but I've read a few guys claiming the NV4K BW was pretty narrow.

That did not surprise me however, I figured taller antennas of the time, were what folks were talking about...when they made claims about High Gain antennas seen in magazine advertising. That seemed to fit nicely and make some sense with the old stories we heard about beams..."if you want maximum gain you have to sacrifice some rejection." Now-a-days I see this idea has got some merit with my Eznec CB vertical models as well.

I can only guess that the very wide BW you've reported has to do with some substantial losses in your system somewhere.

<blockquote data-quote="Marconi" data-source="post: 746027" data-attributes="member: 903">I can&#039;t explain Alexis, I can only try and remember the experiences I had with my S4 some years ago.I was given the S4 by a long time local friend named Bill. Bill got it from another friend, and it was a &quot;demo&quot; installed at his CB business&nbsp; back in the days when Antenna Specialists was promoting their new Sigma 4 antenna. It was laying in Bill&#039;s back yard in 2 pieces, but otherwise it was fully assembled. I took it home and added the top section to the bottom section, and the match was good on a 5&#039; testing mast. So, I raised it up to about 20&#039;-25&#039; feet, worked it for a while, and got a few very good responses (unsolicited signal reports). When it was low to the ground it messed up some electronics at my house, but on raising the RFI went away for me. I also had no complaints from neighbors...like I&#039;d had with some other antennas back around that time, so I was aware of interference back then in a very primitive sorta&#039; way. I found the antenna match to be very steady on raising. I never did a lot of testing on it up higher, because it was so tall. I also recall the bandwidth was a lot less compared to my SD, A99, Imax, CLR2, and possibly a few others.So, I cannot explain the very broad-bandness you&#039;ve reported above. I also know that Sirio reports their NV4K showing about 1.4 MKz &lt;2.00:1 SWR bandwidth plus the gamma on my S4 was physically very small...so I figured that had some limiting effects on tuning range too. I never owned a Sirio, but I&#039;ve read a few guys claiming the NV4K BW was pretty narrow. That did not surprise me however, I figured taller antennas of the time, were what folks were talking about...when they made claims about High Gain antennas seen in magazine advertising. That seemed to fit nicely and make some sense with the old stories we heard about beams...&quot;if you want maximum gain you have to sacrifice some rejection.&quot; Now-a-days I see this idea has got some merit with my Eznec CB vertical models as well.I can only guess that the very wide BW you&#039;ve reported has to do with some substantial losses in your system somewhere.</blockquote>

[QUOTE="Marconi, post: 746027, member: 903"] [SIZE=5] I can't explain Alexis, I can only try and remember the experiences I had with my S4 some years ago. I was given the S4 by a long time local friend named Bill. Bill got it from another friend, and it was a "demo" installed at his CB business back in the days when Antenna Specialists was promoting their new Sigma 4 antenna. It was laying in Bill's back yard in 2 pieces, but otherwise it was fully assembled. I took it home and added the top section to the bottom section, and the match was good on a 5' testing mast. So, I raised it up to about 20'-25' feet, worked it for a while, and got a few very good responses (unsolicited signal reports). When it was low to the ground it messed up some electronics at my house, but on raising the RFI went away for me. I also had no complaints from neighbors...like I'd had with some other antennas back around that time, so I was aware of interference back then in a very primitive sorta' way. [B]I found the antenna match to be very steady on raising. I never did a lot of testing on it up higher, because it was so tall. I also recall the bandwidth was a lot less compared to my SD, A99, Imax, CLR2, and possibly a few others.[/B] So, I cannot explain the very broad-bandness you've reported above. I also know that Sirio reports their NV4K showing about 1.4 MKz <2.00:1 SWR bandwidth plus the gamma on my S4 was physically very small...so I figured that had some limiting effects on tuning range too. [/SIZE] [B][SIZE=5]I never owned a Sirio, but I've read a few guys claiming the NV4K BW was pretty narrow. [/SIZE][/B] [SIZE=5] That did not surprise me however, I figured taller antennas of the time, were what folks were talking about...when they made claims about High Gain antennas seen in magazine advertising. That[B] seemed to fit nicely and make some sense with the old stories we heard about beams..."if you want maximum gain you have to sacrifice some rejection." Now-a-days I see this idea has got some merit with my Eznec CB vertical models as well.[/B] [B]I can only guess that the very wide BW you've reported has to do with some substantial losses in your system somewhere.[/B][/SIZE] [/QUOTE]

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