EME  OK2AQ

JN89eu                               mirek@kasals.com


 

10 GHz


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May 2016
setup_May2016
I was looking forward the week around DUBUS EME 3 cm and up contest as high activity was expected and therefore an opportunity to experiment. The conditions for EME on microwaves were also excellent. I had few things to test - a new, more robust tripod with dish mounted higher above the ground. However primarily I needed to try out the new system of Doppler shift compensation in reality, see article DUBUS no.1/2016. With my QRP setup – 1.8 m dish and power around 20 W – it is very hard to take part in the CW contest but for enjoyment and a lesson-to-learn it is good enough. We succeeded to repeat QSO with VK7MO who has 77 cm dish and 50 W, this time in JT65c mode. Signal width was 3 Hz only and we used no averaging, see Rex’s and my screens below.  QSO JT65c with G3WDG followed. There was a bigger spread among EU stations but sigs were stronger. Next day when the minimal signal width was 20 Hz a QSO with VK7MO JT65c could not be established anymore. Total number of QSOs was 12 with two initials EA3HMJ and PA3DZL (JT4f). Two QSOs were managed with OK stations – CW OK1KIR and JT4f OK1CA.
VK7MO080516
VK7MO_OK2AQ
VK7MO_screen

September
  2015
 MW MW ARRL EME Contest is a good opportunity for EME experiments because activity on microwaves is higher. I wanted to test a new system for Doppler shift compensation. On 3 cm band at very weak signals which are not only below hearing levels but also very difficult to notice on the waterfall immediately, it is a fundamental thing. Next needed merit is an ability to operate on a precise frequency in order of tens Hz. For that reason I have built a transverter 148/18 MHz with DDS synchronized by rubidium frequency standard as well as microwave transverter. Control program allows to compensate Doppler shift for Rx as well as Tx in all cases which can occur.

GUI_Dopp



On August 30. I worked OZ1LPR (14DB/20DB), 3.9. wkd WA3LBI {#12} (15DB/15DB) and OK1KIR (13DB/13DB). 4.9. wkd HB9Q {#13} (12DB/13DB) and in the contest 5.9. OK1KIR (13DB/17DB). 6.9. wkd OK1CA (13DB/18DB), HB9Q (13DB/11DB) and OZ1LPR (14DB/15DB). Finaly 8.9. wkd OZ1FF {#14} (14DB/14DB). Mode of all QSOs was JT4F.

May 12 - 19, 2015

Several days around ‘Dubus Contest 10 GHz and up’ I turned to EME experiments, too. My small setup 1.8 m dish and 20 W power in the feed is not suitable for contesting but number of station welcomed an opportunity to test their equipment. Beside that we tested new software WSJT-X included JT4 modes. On May 13, I worked G3WDG as first WSJT-X  qso (10DB/16DB). Next day wkd W5LUA {#9} first with WSJT10 (13DB/14DB) and then WSJT-X (7DB/12DB). We are able to see much better measured signal levels by WSJT-X. On Friday wkd CW OZ1LPR #4 (569/O) next OK1CA and OK1KIR both JT4F (12DB/14DB). On Saturday early morning attempted with VK7MO WSJT-X ended with several sync relations but decoded only by post-processing. In the contest I made three CW QSOs with OK1CA #5 (O/O), OK1KIR (O/O) and F1PYR #6 (O/M). Except the contest wkd JT4F UA4HTS and VE4MA {#8} both (13DB/14DB). After the contest wkd interesting QSO CW/JT4F with PA0BAT {#9} (O/O) and JT4F ES5PC {#10} (O/O). Last day May 19, wkd JT4F OZ1LPR {#11} (12DB/20DB). 

October 3 - 4, 2014
October 4, worked UA4HTS (JT4F -14/-12 dB)
October 3, worked G3WDG (JT4F -12/-13 dB)
 
VK7MO - OK2AQ       A successful QSO between two small stations
 

On Friday October 3, a QRP,  JT4f, QSO was completed between Rex, VK7MO operating portable from Mt Wellington in Tasmania, QE37oc  and Mirek OK2AQ in the Czech Republic, JN89eu. VK7MO used his standard portable equipment consisting of a 77 cm dish and 50 W. OK2AQ used  a 180 cm dish and 20W.  Rex automatically compensated Doppler shift for both sides using the VK1XX program. We used horizontal polarization with spatial offset about 17 deg that was compensated by OK2AQ. Exchanged  reports were -19 dB/-20 dB. Averaging was required at the VK7MO end due to the lower TX power at OK2AQ. The timing of the sked was chosen for extremely good conditions: spreading 15 Hz and degradation 0.5 dB. I was the smallest station Rex has worked to date and vice versa.

 

VK7MO_1 OK2AQ_1

Excellent EME condition: spread 15 Hz and deg. 0,5 dB resulted gain about 5 dB as compared with September 19. The 1270 Hz tone from VK7MO shows difference:
VK7MO1508
 
There are VK7MO JT4F sigs (never seen so narrow lines on 10 GHz EME):
VK7MO JT4F














full report about VK7MO-OK2AQ QSO
 
September 17 - 20, 2014

September 20, measured SN/CS = 9,5 dB (SFU = 109) and MN/CS = 0,6 dB

September 19, worked OK1CA (JT4F -15/-15 dB) and  (G3WDG (JT4F -12/-16 dB)

OK1CA signals                                                                     G3WDG signals
Ok1CA_G3WDG

Test with VK7MO (77 cm dish and 50 W) in QF04xc. At both sides were indicated 1270 tones:  VK7MO
but messages were not decoded at these poor conditions (spread 150 Hz, deg. 2,2 dB).

September 18, worked UA4HTS (JT4F -15/-15 dB)

July 14 - 26, 2014

July 25, worked random OK1KIR (JT4F -12/-15 dB)

July 21, 2nd QSO with VK3NXVK3NX_qso

 

 

 

 

 

 

 

 

 

 

 

 

 

VK3NX JT4F signals

VK3NX_JT4F

 

 

 

 

 

 

 

 

 

 

July 20, worked VK3NX (JT4F -14/-14 dB), OK1KIR (CW 569/O),

                               OK1KIR (JT4F -13/-13 dB), LX1DB (CW 559/O)

 

July 14, MN/CS ratio

MN_CS

 

 

 

 

 

 

 



SN/CS ratio, SFU = 112
SN_CS

 

Own Echo:  Az/El = 127/16, Dopp. = 13613 Hz (compensated), Lib. = 38 Hz, Degr. = 0.13 dB

Echo140714

 

May 24, 2014    DL0SHF 10 GHz  EME Beacon

DL0SHF_240514

Speaker copy: DL0SHF_250514.wav

The WSJT level should be likely better than -10 dB(?)

DL0SHF

 

 

 

 

 

 

 

 

 

 

 

OK1KIR JT4F precise -12 dB

OK1KIR_JT4F

 

 

 

 

 

 

 

 

 

 

No answer from my side due to Tx failure.

DL0SHF and OK1KIR signals with Doppler shift compensation:
JT4F_JT4G

















Between September 26 and 29 I was attempting my first 3 cm EME from our country house QTH in JN89EU. My overall setup is on a smaller side ­ dish 1.8m, 20W. In the p receding two days while experiencing bad weather I was busy measuring SN, MN and C/G ratio. On September 27 we had a sked with Franta OK1CA. We were able to hear each other but failed to manage a QSO. During the ARRL EME Microwave contest I was able to steadily hear sever big CW stations: DL0EF, DL0SHF, OK1KIR, LX1DB and fragments of few others.  On September 28 I was trying to call strong stations many times without success,  just "QRZ?" from a few. Many attempts later I finally received a reply from DL0EF with my call sign at Moon elevation 15 deg when spread was already a bit lower - about 100 Hz. The next day, we managed another sked together with Tonda OK1DAI, a member of OK1KIR team. Tonda suggested JT4F mode for QSO and after several minutes the QSO was carried out with mutual reports "O". I was very pleased, of course. Big "Thank you" to Tonda! 

   
   

EME

432 MHz

LOG            Equipment            Documents            Pictures            QSL
New Antenna  M2 8WL switchable h/v:                       (2015)
70cmHome3
70cmHome2 70cmHome1

 

FIRST EME Contacts:

Antennas at home in JN89HF about 300 m a.s.l. designed for satellite communication.

Only vertical 19 el. Yagi was used for first attempt of EME qso on 70 cm in April 2010.

      

Rig: FT-847, 50W output power

WSJT window of the complete qso by JT65b mode

 

The QSL card HB9Q confirming QSO described above

  

Indeed, the equipment of HB9Q is excellent:

- 15.28m dish, f/d: 0.53, double cross-dipole
- RX: switchable H/V, TX: circular
- 7/8'' hard-line by Huber & Suhner
- GaAs FET 0.4 dB NF by DJ3FI
- 2x8874 by HB9SV, 1 KW
- Kuhne Electronic TR 432 H into Flex 5000 
- NF Filter: DSP 599zx
- JT65B by K1JT

 

Next day another big gun succeeded fully random:

 

And chat following QSO:

18 17:07:16        OK2AQMirek                  PI9CAM     your best -18, TNX and best 73s

18 17:04:38        PI9CAMTeam CAM       OK2AQ      Yr best -25. mny tnx fer fine qso, best 73' 

18 17:04:27        OK2AQMirek                  PI9CAM      thanks for qso. I have 19Y and 50 W.