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New antenna from Sirio Gain-Master

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  #1  
Old 10-08-2010, 10:58 AM
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Default New antenna from Sirio Gain-Master


New 5/8 antenna from Sirio Italy.
Gain-Master, the new reference in its class of antennas
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Old 10-08-2010, 02:29 PM
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According to Sirio, this antenna is due to be available at H&Y in November. They must be shipping the current production into their market in Europe.

I was sure surprised when I saw the internals described by Sirio for this one. If the CB world goes silent like it has with the "New Top One," then the price will drop and it'll be a bust. Could it be yet another antenna designed for dreamers only.

It looks like a very interesting antenna, but due to its reported modest power handling ability it could be in question whether or not it draws much favor in the US with CB seemingly hung up on current day raw power. I'm also wanting to see how Mother Earth affects this antenna's real radiated pattern and if we can realize the claims made---whether it's balanced as claimed, or not. It does appear to be fed at a current null for a 5/8 wl radiator, so maybe this is true it is a .625wl.

I remain open minded simply because the bandwidth curve seems to indicate something else is going on. There is a little SWR skew to the higher side of frequency to be noted in the SWR bandwidth curve and that may explain something about it being more than a simple 1/2 wave dipole if understood. It is also noted to be resonant as high as 27.800 mhz in the technical info on the Website, with a nice 4+ mhz BW to take care of both 10 & 11 meters without a tuner.

I hope this one meets expectations, because I like my 1/4 and 1/2 wave antennas, in some cases even when compared to my much bigger and longer antennas---at least on the local scene. Plus I can get those little skinny antennas up much higher and without nearly as much worry about the weight and the length.

Can't wait to see some real pictures of this thing unassembled and close up.
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Old 10-08-2010, 02:34 PM
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looks easy enough to build, or at least to try.
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Old 10-08-2010, 04:37 PM
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Very basically, Sirio has just changed their advertising, this antenna 'type' is nothing new at all, it's been around for a very long time. The only change I can see is in it's 'looks', not it's general electrical characteristics. It may show 1 - 2 dB of gain over another 5/8 wave antenna? Good grief, you can say that about any two antennas! That's more an environment thing than any electrical 'improvement' in an antenna.
'Stub' tuned? I don't think that's any particular benefit, although it can certainly make things easier in construction. The fiberglass thingy is also one of those 'ease of construction' things. (Oh boy! More fiberglass/metal controversy/debates!)
Got to say it's probably going to 'help' their sales, maybe, so it ain't bad advertising. It's also not exactly a super reference though, guess that just depends on what 'class' of antenna it is, huh?
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Old 10-08-2010, 04:49 PM
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Whatizzit?
A Big Stick with a capacitor between the middle/upper part of the radiator - and a built-in RF choke at the base. Cleverly packaged and marketed; built with the right materials.

Probably will work well. But to say that they have beat the common-mode current problem of the Big Stick - has yet to be seen. Think it is a matter of the power put in it - as this would make the difference - right?
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Old 10-08-2010, 05:56 PM
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Quote:
Originally Posted by Robb View Post
Whatizzit?
A Big Stick with a capacitor between the middle/upper part of the radiator - and a built-in RF choke at the base. Cleverly packaged and marketed; built with the right materials.

Probably will work well. But to say that they have beat the common-mode current problem of the Big Stick - has yet to be seen. Think it is a matter of the power put in it - as this would make the difference - right?
the only difference more input power would make to common mode current is a stronger rf field radiated from the coax with more disruption to the radiation pattern and possibly worse rfi.

less power won't stop common mode current but may reduce some of its detrimental effects.

if an antenna is properly balanced as this one may well be then common mode current is eliminated and the coax effectively becomes a balanced feeder with equal and opposite currents trapped within the inner of the shield eliminating coaxial radiation and its adverse effects.

i wouldn't be too quick to write off sirios ability to improve on the big stick design,they managed to improve on the avanti sigma 4's design from a signal not mechanical point of view,which in itself was no mean feat.they may not build the best mechanical antennas but they make very effective radiating antennas.


i do agree though it still has to be seen.paper claims are one thing,reality is something completely different,but on this one looking at the design i wouldn't be at all surprised if they have produced something a bit special.
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Old 10-08-2010, 06:03 PM
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Quote:
Originally Posted by W5LZ View Post
Very basically, Sirio has just changed their advertising, this antenna 'type' is nothing new at all, it's been around for a very long time. The only change I can see is in it's 'looks', not it's general electrical characteristics. It may show 1 - 2 dB of gain over another 5/8 wave antenna? Good grief, you can say that about any two antennas! That's more an environment thing than any electrical 'improvement' in an antenna.
'Stub' tuned? I don't think that's any particular benefit, although it can certainly make things easier in construction. The fiberglass thingy is also one of those 'ease of construction' things. (Oh boy! More fiberglass/metal controversy/debates!)
Got to say it's probably going to 'help' their sales, maybe, so it ain't bad advertising. It's also not exactly a super reference though, guess that just depends on what 'class' of antenna it is, huh?
- 'Doc
theres plenty of electrical changes built in to it.

if anything from a manufacturing point of view a fibreglass antenna is more difficult to construct than aluminium,its just easier to put together for numbnut cb'ers who can't setup aluminium antennas properly,the term used in the uk is idiot proof.

i don't see what relevance an environment thing has when it comes to this antenna,its not designed to be easy on the eye,its designed to perform,the fact its easier on the eye than a 5/8 wave gp is probably insignificant if you appreciate the thought that has gone into designing it.
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Old 10-08-2010, 11:23 PM
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Environment...
Everything around an antenna affects that antenna, what it's near, particular things that may be around it, etc, etc. All of those things can and do affect an antenna's impedance, no way around that, it's absolutely normal behavior.

It's been quite a long time ago, but I put together an antenna simular to this Sirio new one, it used two sections of coax, one a 'stub', connecting to a vertical 5/8 wave length of wire (no capacitor though). The whole thing mounted on a chain-link fence into a tree. It worked just dandy. Wish I still had the information about the particular coax and lengths etc. But, that's gone and I can't find the 'old' information anywhere. Oh well... if it were easy it wouldn't be any fun!
- 'Doc
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