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THANOS, SW1LJZ Greece - Scorpion II
Subj: Scorpion II Quad Performance
My CUBEX Scorpion II is on the mast and its doing great.
Very clean and nice reception and I get excellent reports from other stations.
This antenna does the same job as my previous 14 element yagi and guess what ?
Scorpion has better reception of very low signals ! ! ! and half the length.
This is the best VHF antenna I ever had.
Thank you CUBEX.
73s from Greece
BLAIR - SKYMASTER II-PT5Subj: Quad Performance and purchase request
I told you I would eventually provide you with a performance evaluation. Here 'tis:
The CUBEX 2 el, 5 band Skymaster Quad is really a performer! I have had it up now for a couple of months now and it has been great! As a very casual DX-er, I have worked several of the Pacific islands on 10 meters even though the band has been really dead lately due to the sunspot cycle and summer doldrums. I have also used it to work Europe and many domestic 10 meter stations and FM repeaters. It works great! Although the tuner is not necessary, I get outstanding results with a tuner from the bottom of ten meters well up through the FM (29.6) portion.
I have also been using the CUBEX Skymaster on 20 meters for PSK-31. I usually run 5-10 watts and I am frequently told I am the "loudest signal" on that mode.
My installation is certainly not optimal. The quad is centered at about 45 feet, but is well below many nearby trees which extend up to around 90-100 feet. I even had to cut some limbs to make room for it. Additionally, there is a second (130 foot) guyed Rohn tower only about 15 feet away from the Quad's 45 foot tower. The guys are grounded on both ends (not broken up with insulators) and one of them runs within two feet of the 20 meter element at its closest as the Quad is turned. This should be an RF "nightmare," but it doesn't seem to affect the Quad's performance or bandwidth.
I also have a lot of electrical noise at my location due to aging power lines. The Quad is extremely quiet when compared to my (B&W-style) folded dipole.
Despite all of this, the Cubex Quad is a powerhouse! It tends to open up 10 meters and shut it down. I have had excellent results on 20 as well. Overall, it is an awesome antenna!
I am feeding it with a single (LMR-400) feed line and using an Ameritron RCS-10L switch.
Thanks for all of your patience and help during my drawn out (almost two years) installation process. Feel free to use me as a very positive reference.
Regards and see you in Huntsville (I hope).
Ernie Blair WA4BPS
Director, Huntsville-Madison County 911 Center
I am impressed with the excellent packing of the antennas, easiness of assembly and practical manual. The gain is fantastic. I am very satisfied.
I am sending some photos of the first antenna. This one is mounted in a 30m height tower with a yeasu g-1000dxa rotator.
The next one will be installed on the next week end.
Thank you my dear friend
Sao Paulo - Brazil
ps: with this antenna I earned three contests
2M QUAD - W6AXM
I received my dual band VHF quad on Thursday and spend part of this evening assembling the two meter 8 element portion. In the instructions you mention forming a balun from the coax feed line but I could not find any indication of the diameter of said coil. Did you mean to wind it on the boom or was the omission of the diameter information simply an oversight.
I have to send my compliments regarding the preparation of the quad kit. It really could not be simpler to assemble, at least for the 2 meter portion. Frankly I expected the boom to be at least 12 feet because the 4 element Telrex yagi I used to have was that length. It was claimed to have been wide-spaced which may make a considerable difference. What I know about quads in general is only that which I read in Bill Orr's Quad book many years ago so I may have forgotten some salient points.
Since the quad is essentially a set of parasitic expanded folded dipoles, why would it not be better to feed it with balanced line, instead of coax. Yes, I realize that most folks do feed with coax because the typical feed point impedance is somewhere around 60 ohms. But wouldn't 72 ohm balanced line do just as well or better?
Thanks for your attention and forbearance..
73 - Gar, W6AXM
Subject: 3 Element Mark Series
Just wanted to drop a quick note to let you know how pleased I am with the performance of the 3 element 20-15-10M Quad that I purchased from you. I have been licensed for 35 years and have spent the last 15 or so with either dipoles or verticals ... I recently purchased the quad and a 40 foot tubular stand up tower from US Tower ... The total installation was completed by myself, w/o any additional help (required some occasional ingenuity) and took about three weekends including digging the hole for the self supporting tower base, pouring the concrete and assembling the antenna including the installation on the tower. I built a scaffold out of 10' 2"x4"s to assemble the elements to the boom ... the tower was tilt over capable and once the quad was fully assembled on the scaffold the tower was simply tilted over and attached ... Sounds so easy in this e-mail but did require a bit of physical energy being expended.
The performance of this antenna, even at 40' is magnificent ... I have worked 17 new countries in 3 days ... usually punch through the pile up on the first or second call ... I think that the longest I have waited in any pile-up is 4 or 5 attempts ... and have almost always received 59+ reports throughout the world ... F/B appears to better than your specification and F/S ratio also appears to beat the spec you publish ... all of these observations are obviously non rigorous but the empirical results are GREAT ...
Best wishes ... Thanks and 73 - AA6EV
MK III - Quad Survives hurricane IVAN ! -
note- there were four Florida Hurricanes in 2004 - our worst year ever!
I ordered a 4 ele 6 meter quad (QUEEN BEE) Monday morning and was surprised to see to arrive today, Wed.
The antenna was very easy to assemble, and works great, tests with locals show excellent front to side and better than expected front to back. I was using a dipole before and thought I had success with it. However this evening, we had e-skip into 6 land (I am in NC) and I could not even hear some of them on the dipole and they were S 5-7 on the Cubex. The antenna is only around 40 feet off the ground.
All in all your product meets, if not exceeds, your claims, and your service is fantastic!
For anyone needing directivity on 6 and lacking a tall tower, CUBEX is the only way to go!
I have just returned from customer's house after all finishing the assembling the Cubex quad. Pre-cut element helped me so much so that I assembled this quad by myself today. I started to assemble at 1:30P.M. and I could completed the all assembling at 5:30P.M.
I checked SWR by using antenna analyzer and I confirmed that SWR was near 1.1 at 27.200Mhz without any adjustment though height was only 3 feet above the ground. I have never seen such a easy assembling and good performance referring to the quad antennas!
Thank you for your visiting to my website and you could see the pictures of big quad antenna.
As I told you before, I am dealing in Japanese quad. This is the only quad kit maker in Japan and its company name is Perfect Quad. JA9FS,Mr.Kawaguchi is president.
Perfect quad is supplying mainly HF(14,18,21,24,&28Mhz) and optionally 50Mhz.
As I hope that you have not only big HF antenna such as 7Mhz but also 50,144 & 430Mhz quad antennas, there is so much chance to sell variable customers who want to try to use the quad antennas.
Thank you very much for your co-operation, Norman.
EXPO-2L10N15 YC0IQ- Indonesia
File: KillerBee 03-2002-
Well here it is in the sky working great. Maybe I should call this one the “White Knight.” The Mist Gray Marine Polyurethane sure looks white to me! My friend picked out a darker gray in the same type paint.
The first contact was a VP8 in the Falkland Islands. My friend near me who I bought the other antenna for has not put his up yet. He has a 5 element Cushcraft yagi as I had and could not hear the VP8 that was a very good signal to me.
Resonance is at 50 MHz and is 1.5:1 @50.275. How much do you think one should shorten the driven element to bring the resonance up to 50.1 MHz?
Grove City, FL
Subj: Quad Performance
Subj: Happy Satisfaction
A year ago I bought the Cubex Yellow Jacket 2-Meter 4-element Quad antenna. after using a high gain vertical antenna, I finally put the antenna up at 50 feet, just above my TV antenna, and found that the antenna also worked fine as a vertical, so I didn't need to twist it around for local contacts.
As distances increased to about 75 miles, I often accessed the Dallas 146.88 repeater at full quieting. Then, using my ICOM 2100, running 55 watts, a band opening into Jackson, Mississippi lasted for more than an hour, with good copy at both ends. This was in excess of 500 miles. What a thrill!
By the way, I am an Old Timer, having been a
ham since 1958, . . . . . . . Your design is so simple to match, it's almost like magic.
MK II Quad
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