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Sirio Gainmaster

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Old 03-05-2012, 01:32 PM
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Default Sirio Gainmaster


Hi, everybody. I was wondering if any of you ten meter and cb radio operators have used/use this antenna? For those of you that have no idea what this antenna is, it is a 5/8 wave vertical that is quite broadbanded, and its frequency range is from 25.5-30 Mhz with a 2.0 SWR in that entire range. In the past, I have had good luck with various verticals for ten meters...the Cushcraft AR-10, and the MaCO V58 for CB use. However, at least in my experience and without using a tuner, I was never able to use either antenna on BOTH 10 meter band AND the Citizen's Band. The best I got was around a 1 Mhz bandwidth at 2.0 SWR or less.

--I realize the antenna is not cheap, but if it can cover 26.965-27.405 Mhz, and also 28-29.700Mhz with just one antenna, it just might be worth it (then I can use my antenna tuner for various wire antennas, etc.). So, has anyone on this forum used one yet? Are the broadbanded claims I see on YouTube true? Thanks for your help.


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Old 03-05-2012, 02:12 PM
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I use a gm on cb and it works great. I have it attached to my radio with 50ft of times microwave lmr 400 coax. The antenna is up about 45ft with no obstructions. The mast is grounded to a home depot ground rod buried with just 1ft showing. My swr is extremely low in that it barely moves the needle. I am pleased with it so far. My .02

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Old 03-05-2012, 02:25 PM
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--Have you tested the antenna in the 12 meter band (24.890-24.990)? I know it's not rated down that low, but was just curious. Too bad they didn't make the antenna to xmit from 24.890-29.700, but I guess that's just nit-picky, as it could probably be tuned with little problem by the radios internal antenna tuner (assuming your radio has one built in)

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Old 03-05-2012, 02:57 PM
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The A99 and the Imax 2000 can be used all of the way up to and including the 20m band for almost half the price of the SGM.
Talked to Japan and Ireland on that Imax on 17m.

While the SGM uses an innovative design, I've always felt that it was a little too expensive and couldn't handle 500 watts without popping the capacitor . . .
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Old 03-05-2012, 03:07 PM
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I use one for both 10 and 11 meters. I had an Imax2000 that broke.

I have no empirical evidence that this antenna is better than the Imax, but it seems to hear better than the Imax did, so therefore would also likely have a slight improvement in TX over the Imax as well. It is pricey. I have no issue with power, as I rarelly go over 100 watts on either band. I'm sure with a tuner it can cover anywhere the Imax can.
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Old 03-05-2012, 03:27 PM
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Quote:
Originally Posted by Robb View Post
The A99 and the Imax 2000 can be used all of the way up to and including the 20m band for almost half the price of the SGM.
Talked to Japan and Ireland on that Imax on 17m.

While the SGM uses an innovative design, I've always felt that it was a little too expensive and couldn't handle 500 watts without popping the capacitor . . .

There is nothing special or magical about the A99 or the Imax 200 that "allows" it to operate from 20m up to 10m. Pretty much anything including a junk piece of scrap wire strung out for 18-20 feet will do the same with an antenna tuner. I just cannot understand everyone always talking about them in that fashion. I used to work 20m-6m with a 9 1/2 foot antenna on the mobile and an auto tuner at the feedpoint. To me, and most others, an antenna is useable on a band if it presents a decent SWR without an antenna tuner and radiates somewhat efficiently. I tend to differentiate between "it's useable on 20m" and " I use it on 20m". I have "used" some pretty "unusable" antennas especially on 80 and 160m.
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Old 03-05-2012, 03:31 PM
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Quote:
Originally Posted by Captain Kilowatt View Post
There is nothing special or magical about the A99 or the Imax 200 that "allows" it to operate from 20m up to 10m. Pretty much anything including a junk piece of scrap wire strung out for 18-20 feet will do the same with an antenna tuner. I just cannot understand everyone always talking about them in that fashion.
Where did I say 'magical'? Must be assuming. I merely pointed out - as you did - that for the money spent (yes; I am cheap!), that an A99 or an Imax offers much the same thing that a SGM does at half the price.
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Old 03-05-2012, 03:50 PM
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--While I understand the Gain Master has approximately 4.5Mhz of bandwidth with 2.0 SWR, but what about the IMAX2000 and the Solarcon A99 (without an antenna tuner, that is)? I was thinking that both the IMAX and the A99 "only" had about 1 Mhz of bandwidth (which I am probably wrong). I have never heard of a CB antenna with as much bandwidth as the Gainmaster. Makes me want to look inside one to see what gives it that edge of that extra bandwidth. I have no idea what kind of "item" that could be added to the antenna to give it more bandwidth, but I would sure want to add it to my MaCO V58, which I love.

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