Tuesday, December 31, 2019

Stew Perry OK6W from OL7M

Pavel OK1MU is enjoying Christmas holiday also at OL7M contest QTH. Expect the 160m DXing he run also Stew Perry Top Band Challenge.

There is his 3830 post:
One of the most interesting contest of the year. Many friends on the air and good conditions towards the NA. Worked 300 x NA and 16 x JA. Used IC-775DSP, 40m Vertical and 8 BVRGs. Thank you for all the QSOs and see soon you during ARRL RTTY Roundup. Happy New Year! Pavel, OK1MU (OK6W)

Our new Top Band vertical

 SH5 statistics:

Call: OK6W
Operator(s): OK1MU
Station: OL7M
Class: Single Op HP
QTH: Policko
Operating Time (hrs): 14
Location: Northern Europe
Summary:   Compare Scores
Total:QSOs729Total Score5,669

Sunday, December 8, 2019

Radio Astronomy 8.4 GHz, part 1: building antenna

It was my childhood dream, EME and radio astronomy. I took long years and now I do have room and rest parts but missing time :) This winter (2019) I have decided to do something. On the wine with my friend Lubos OK2BEN we have started to speak about mechanical parts. He sent me full mechanical drawings after a few weeks :) What a service. Also with the full list of parts so I just could order it and start...

The mechanical system is based on nice HW by Marek OK2DL

A few years ago we got nice 4m dish from NEC. It has got f/b = 0,25. It is not very usable for EME. I have decided to learn more about mechanical systems and good RX from the space. This is great possibility.

So I bought welding machine and started learning :) There is a lot of to improve and learn...

Thanks to my girlfriend Lucka for help :)

Franta OK1CA visited me one day and we spoke about satellites, EME and also 8.4 GHz. He offered me his septum feed design. I bought all parts for two pieces and found one Sunday. Result was one feed which I sent to Franta for tunning. Thanks a lot Franto! He allowed me to publish his designe: HERE you can download it.

I found small piece of CuAg sheet and started.

And there are results for port isolation and S11:

 Photos from Franta: Kumar for dish