Tuesday, January 7, 2020

ARRL RTTY RU 2020 as OL7M M/S





Again after a year there was the first Multi Single contest. There is a few photos and 3830 notes from Pavel OK1MU. Also some work was done :)

ARRL RTTY RU - Nice start  of new contesting year. Since some multipliers were only on FT4, for the first time we had to try this kind of operation. We made 1 x FT8 and 73 x FT4 QSO. Technologically, FT modes are very interesting, but .... Of course, everybody does what he enjoys, but this is nothing for us. In addition, we had also big problems with logging, rewriting QSO numbers etc. FT4 and FT8 should have their own special contest but should not be counted as the usual DIGI modes where the human factor is needed. This is a purely automatic robotic thing without the necessity of a human. Btw, number of our qso with NA for all years when we regularly participate in ARRL Roundup:
2013 - 693 QSO 
2014 - 682 QSO 
2015 - 443 QSO 
2016 - 516 QSO 
2017 - 425 QSO 
2018 - 444 QSO 
2020 - 625 QSO 

Anyway, the contest was great and we enjoyed it very mutch. Thank you all for ALL QSOs and we look forward next time.


Upgraded 4 TRX Remote/SO2R switch box and 2el Moxon for 40m
 New members of OL7M family :)






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:
 NA QSOs

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