My 144MHz array is finally of the ground and up where it belongs again.
Here are some pix of the setup.
Information; 144Mhz eme antenna is currently grounded. 🙁
Will be back, soon, with, goooooood news, I hope 🙂
73
de
LA6TPA
What a mess, but it is working. XYL not to happy about all rods and wires in her garden. 2 X 12-El.-Yagi EF2012B modificated for 50 Ohm-V by DK7ZB
Telescopic Mast for my 1296Mhz EME project has finally arrived from PHT in China. But winter is at the doorstep here, so I think not much is going to happen with it before spring time.
During last weekend I was playing with a temporary setup of an old Cushcraft 13B2 145MHz yagi that I had lying around. The aim was to try and decode some EME traffic with a simple station setup, but the old 13B2 did not yield any result. Then I decided to build a more efficient antenna by myself.
After considering many design options I decided to build a 12-El.-Yagi EF2012B modified for 50 Ohm-V and optimized by DK7ZB. Here is a preliminary progress report:
VNA results not so good. I suspect that the elevation rotor is to close to the boom. I have to make a new rotor arm to get the rotor out of the way. …………….to be continued
LATEST UPDATE:
Been working on the matching problem all evening and it has nothing to do with the proximity to the rotor.
It’s all about fine tuning this part, the radiator. Trimming the V-dipole length and bending angle did the trick.
Now it looks very close to the EZNEC simulation.
I think there may be potential for better return-loss by some more fine tuning, but it is not going to happen tonight!
MORE PIX.
After over nine years with the DK7ZB 4-Element-28-Ohm-OWA-Yagi with 2,20m-Boom I decided to do an upgrade. During about 7 hours work on August 19, 2016 I dismantled the old 2,2m boomer, recycled a lot of its parts and build a new DK7ZB 6-Element-50-Ohm-Yagi with 6,00m-Boom
Here are some pictures:
Radiator is from the old antenna, but as this is a 50-ohm antenna the old DK7ZB match is replaced with a choke. Here I have 4 ½ turns, ID approx. 50mm. I threw in some surplus ferrite beads to, but I don’t know if they will do any good.
A little update on my EME project.
Just got the dish kit I ordered from RF-Hamdesign.
It’s a 3-meter dish with septum for 23cm.
But, I am not quite ready to assemble it yet. There are some more things I have to do before I can put into service.