Posts by LZ1JH

Thanks Benno,

I understand that I lost a few weeks with this project. Eventually I was able to get a relatively clean signal at 10mhz, but I needed 25mhz to stabilize the LNB. Lastly, I would like some advice if someone has done well with a BPF filter or something?

73 Rumen

Hi, I have same problem with 25Mhz generated by Si 5351 by GPSDO. Is there already a solution to the problem? I'll be glad if you can share it.

Best regards

Rumen LZ1JH

Hi,

Im have 80 DXCC in logbook.

DN1HRZ SWR It has good values.

Hi,

Two antennas best fit with 75 ohms feeder pieces. However, in order to obtain polarization, it will be necessary to have 1/4 lambda spread. If not to work with the transformer. This is very well explained here: https://www.qsl.net/sv1bsx/antenna-pol/polarization.html

This feed seems to me better than a helix one because I think it's a little overshadowed by the LNB at 10 Ghz. Helix is right ahead LNB. And yagi are around him. But I think so I can be wrong .

73 Rumen LZ1JH

Hi PA1CHL ,

So the individual antennas are 50 ohms. This is described above. I apply a photo of the splitter.

Hello Hans-Jochen,

The individual antennas are made directly from the feeder RG 141-50. The elements are made of copper wire with a diameter of 1,5 mm. The director has a length of 51 mm and a reflector with a length of 61 mm. The distance between them is 30 mm. Fiders must have the same lengths. They gather at a point where the impedance is 12,5 ohms. To match 50 ohms lines, a 25 ohms 1/4 lambda transformer is needed . This is very easy with two pieces of RG 141-50 tailored to the shortening coefficient. For this cable is 0.7. The most important thing is to properly connect dipoles to get LHCP. I showed it on the attached picture. For proper connection, LZ2US helped me a lot. The best SWR I received is about 1,2.

73 Rumen LZ1JH

Hello All ,

On the idea of ON7WP Pedro I designed this dual feed. After a few mistakes I finally managed to get LHCP and after reporting RHCP. The two horizontal yagi's are on the Y/4 in front of the two verticals. The antenna is 80 cm offset. With a power of about 2 watts from a SG labs transverter, a 10 meter feeder at a transponder level of -72dB provided a signal level of -64db. So I have already done more than 20 QSO.

73 Rumen LZ1JH

Satellite antenna ideas !

Hello,

Here is my receive of the two beacons of Es-Heal 2. I use an 80 cm offset dish, PLL LNB and RTL SDR.

73 de Rumen LZ1JH