Does anyone know what the theory behind these antennas is? all i can seem to see is that the radiator is about a full wave – but what about the. Ok, I know I just posted about Moxon antennas, but doing an image search for moxon antennas led me to the CJU antenna. Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites I found the 70cm CJU or IO works well on mhz as well.

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Dus was ik snel klaar. I have not built one. I know exactly how you feel regarding the dimensions etc. We were browsing the Net searching for a high gain UHF antenna to be attached directly to the HT, but we only found whip antennas that we have just tested.

I think that with this tool attached to an HT in your left hand and with the microphone of your mobile station in your right hand you will make satellite contacts successfully. K6LCSJan 15, A bit slow at loading,but persevere.

CJU Antenna

I’ll shorten it first to see how that works. I will give the calculator another go ciu. When I told Pedro what kind of stuff I have used to build the antenna we were burst out laughing for a while and he quickly baptized the antenna as the Canary Jail Umbrella antenna in relation to the stuff it was built.

Real Hams review new sites every day sincefor potential inclusion in the Directory, and to evaluate the best place to list them. You need to learn some skills to work satellites so at the beginning you must listening several passes before you push the PTT. W5PFGJan 16, Then we were looking around and we analyzed the antennas we usually use to receive UHF signal with enough gain. A sat antenna that can be easily built with a 4mm diameter aluminium rods and a small PVC pipe.


Well, in a couple of afternoons I have just built the prototype, now Pedro EB4DKA had to test it because he is the expert at working in portable conditions. But somebody could say that a HF station is simpler to work, I disagree with this opinion because if you have a PC which aims the antennas at the moving satellite and changes the frequency, we only must talk, our reliable friend the PC will do the hard work.

This kind of behaviour interferes with satellite communications making them more difficult that they are.

Please consider supporting us by disabling your ad blocker on our website. If anything, if anntenna can imagine that the PVC is the handle of a frying pan, then it seems to be directional on the cooking surface.

It might be just a design where you leave it as it is. Het maken van de CJU.

The CJU Antenna

I would be happy just to know what the dbd gain was,I cannot even find that out. I thought that yagi’s were supposed to be directional ‘off the end’ but instead it aantenna that mine is not.

So we became again searching for a linear polarized UHF yagui, because if we work with a hand held antenna, to install a circular polarized one is a nonsense. To build the radiant and reflector elements I needed a steel wire, when I came back from my father home to the mine a broken umbrella tossed in a trash can caught me eye.


This antenna has a bit less gain than the seven elements Arrow antenna because the IOio antenna is equivalent to a four elements yagui antenna, but we have experienced that it has enough gain to receive the satellites comfortably. I am looking forward to listening to you soon! Also a couple of sites for pass times. E-mailadres verplicht Adres wordt niet getoond. On this occasion we were thinking about how to improve our portable station to make it cku efficient.

CJU or IOIO Antenna for 70cm

Hier wat informatie wat ik over de CJU tegen kwam op internet. Get our latest news and links in your email. De CJU antenna voor 70cm word veel abtenna voor satelliet verbindingen.

Glad to hear that the CJU lives up to its expectations. Not had a proper chance to test this yet but initial tests on UHF in general seem to show that it’s definitely very directional which is good! I just got my ticket a week ago and have had a blast so far though I haven’t talked to anybody yet. K5KDTJan 14, Anyway, I built the CJU 70cm antenna and was surprised about something.

Who is online Users browsing this forum: Sign up to our Newsletter Get our xju news and links in your email. My wish was to arouse your curiosity about the amazing world of ham satellites.