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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W5PFGJan 16, Then we were looking around and we analyzed the antennas we usually use to receive UHF signal with enough gain. Just joking regarding the PL Can you post a picture of it?
Deze werkt zeer leuk, en cj makkelijk te bouwen en licht in gewicht en goedkoop. Get our latest angenna and links in your email. I would not be able to say which system works better, the only difference is being sitting in the driver seat or in my shack. To sum up, we must try to improve the UHF received signals.
KD8KSN QRV: The CJU Antenna
K5KDTJan 14, Our website is made cuu by displaying online advertisements to our visitors. I am looking forward to listening to you soon! Would it also work if the radiator was mounted at right angles to the reflector.
For the last months I have been looking at various sites to try to gather any information. We must give other hams the opportunity to make more contacts. Do you enjoy making your own equipment or antennas? As for the PL, it was all i had spare, so it’ll have to do for now! K6LCSJan 15, I just wish there was more information regarding the theory behind it and why the spacing between the driven element and reflector is what it is etc.
But still using antenan same dimensions and spacing for the reflector. Also, the Feb issue of QST has an article on these antennas. 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!
How all of us know the difficult thing is to receive the downlink because the satellites usually transmit with power out between 50mWatts and mWatts with changing polarization and up to Km far away. I think the latter is to the centre of the wire,if you are using 2 mm wire.
De aluminium radiaal gebogen dat ging als een fluitje van een cent. I know exactly how you feel regarding the dimensions etc. It sounds as if you are more pleased with that,than the Yagi you built the other night. E-mailadres verplicht Adres wordt niet getoond. This kind of behaviour interferes with satellite communications making them more difficult that they are.
Coax kabel eraan …Antennemeter erop, en over de gehele 70cm goed. Also a couple of sites for pass times. Your name or email address: Je reageert onder je Facebook account. He showed us how to program the HT memories and what skills fju must develop to change the frequency while we are searching for the right polarization. Geef een reactie Reactie annuleren Vul je reactie hier in Hier wat informatie wat ik over de CJU tegen kwam op internet.
A sat antenna that can be easily atenna with a 4mm diameter aluminium rods and a small PVC pipe. The rods were perfect too, it was a lucky morning walk.
We can only find this feature in the cubical quad antennas. I’ll shorten it first to see how that works. K5KDTJan 16, Ik hoorde Pa0Ete op de ingang en draaide wat rond en je heb gelijk de juiste richting. Glad to see that you have made one. 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.
The CJU Antenna
This link is listed in our web site directory since Tuesday Dec 3and till today ” The CJU Antenna ” has been antennq for a total of times. Glad to hear that the CJU lives up to its expectations. My estimations from graph mhz 1: I used the inner diameter of the perch and it was perfect. Vul antenba gegevens in of klik op een icoon om in te loggen. De moxon was al leuk, maar dit gaat ook als de brandweer. Door verder te gaan op dju website, ga je akkoord met het gebruik hiervan.
The scale is 1 – 10, with 1 being poor and 10 being excellent. K5KDTJan 17, 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.
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. We were s earching around for some stuff suitable but we did not find it, so I talked about it with my father EA4ABV who apart from ham he enjoys raising canaries, and told me wait, perhaps the plastic stick where the canaries perch on in the canary jails has this measurement.
Nearly forgot,did it work ok for you. Satellite Antenna Tips – Tips that may be of help with the most important part of an amateur ra