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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But in our minds were the same question, Would it work?
Anyway, I built the CJU 70cm antenna and was surprised about something. Maybe a cut and see approach. So we became again searching for a linear polarized UHF yagui, because if we work with a hand atenna antenna, to install a circular polarized one is a nonsense. KO4MAJan 15, So this is the option which fit to our necessities, we gave up searching and became to work. As for the PL, it was all i had spare, so it’ll have to do for now! De CJU antenna voor 70cm word veel antdnna voor satelliet verbindingen.
CJU Antenna By:N6VOA | N6VOA | Pinterest | Ham radio and Ham
Het maken van de CJU. Mind you,I have seen a 3 and 4 element Moxon. Deze werkt zeer leuk, en aantenna makkelijk te bouwen en licht in gewicht en goedkoop. I have not built one.
CJU 70cm Directional Orientation
It is a pity to listen to hams, specially from our country, through the satellites. 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.
I think the latter is to the centre of the wire,if you are using 2 mm wire. We needed a lightweight boom which it could be of plastic of 0. Imagine the drawing of the antenna on a flat piece of paper and the piece of paper is what I pointed at the satellite. It might be of interest to you, http: To sum up, we must try to improve the UHF received signals. It sounds as if you are more pleased with that,than the Yagi you built the other night.
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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!
So far received 1 votes for a total score of 2. I wonder if it would have any gain by just using the radiator,then feeding it with a balun,a 4: 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.
CJU antenna – Transmission1
I used the inner diameter of the perch and it was perfect. Polarity can be “adjusted” merely by twisting it.
Glad to hear that the CJU lives up to its expectations. But still using the same dimensions and spacing for the reflector. The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists Article mentions a gain of 9.
Sign up to our Newsletter Get our latest news and links in your email. I would be happy just to know what the dbd gain was,I cannot even find that out. We must never send a CQ, cji is enough to say our call sign or to call another station we have listened before.
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 dju will make satellite contacts successfully. The scale is 1 – 10, with 1 being poor and 10 being excellent. I will give the calculator another go today.
Pedro EB4DKA and I usually have long conversations and we always have the same idea on the brain, to make the ham satellites easier to work so more people will be able to work them. Do you enjoy making your own equipment or antennas? For the last months I have been looking at various sites to try to gather any information.
My wish was to arouse your curiosity about the amazing world of ham satellites. Also, the Feb issue of QST has an article on these antennas.