EME  OK2AQ

JN89eu                               mirek@kasals.com


 

10 GHz


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ARRL2018

September 2018

4U1ITU and ARRL EME contest 2018


Last EME week was successful. The centerpiece was Zdeněk's OK1DFC expedition to 4U1ITU where, with the help of Attila OM1AM and Braňo OM3YFT, he worked on seven bands from 432 MHz to 24 GHz. Although the conditions there were very tough, caused by city disturbance, defective ground on the roof and the weather, they did it perfectly and at the level of possible. Zdeněk really deserves admiration. Even only in terms of physical and mental effort. To operate a series of consecutive nights with an expedition style (one EME connection after another), solve the above-mentioned problems and during the day to swap and test new bands in two dishes .... hats off.

The equipment for 3 cm band, I had built on Tuesday and at first I performed the usual SN / CS, MN / CS, GN / CS tests, frequency control by listening a reflection of the OK0EA beacon and finally measuring own echo. I discovered a mistake in the company documentation for a small 1.2m offset dish, which I use so far, and which has not been sleeping me for a long time - American colleagues mistakenly counted inches to millimeters, hi.
 
While Zdeněk announced that he will be 27th September on 3cm, we made QSO with Franta OK1CA QRA64D mode (-15DB / -15DB) as a test. Because it was time, I still did  the OZ7Z # 59 (-16DB / -16DB)  followed  by 4U1ITU as # 60 and  the new DXCC (-16DB / -15DB). 28. 9. before start of the contest Charlie called me G3WDG (-12DB / -14DB) and Nikolai UN6PD (-21DB / -18DB).

In the ARRL EME contest I made 15 QSO QRA64D with stations: UR5LX (-19DB/-16DB), OZ1LPR (-10DB/-16DB), OZ1FF(-15DB/-15DB), W5LUA(-11DB/-18DB), HB9Q(-12DB/-15DB), K6QPV (-16DB/-18DB), VK7MO (-16DB/-20DB) # 61, DC7KY (-14DB/-16DB) # 62,  DL6ABC (-13DB/-20DB),   G3WDG  (-12DB/-12DB),   OZ9DT  (-20DB/-19DB),  DL7YC  (-15DB/-15DB),  VE4MA (-16DB/-15DB), N9JIM (-10DB/-19DB) and EA3HMJ (-17DB/-17DB) and 1 QSO CW DL0EF (559.0). Total 1600 x 10 = 16,000 points.

June 2018


I built a 3 cm EME system on Saturday June 9 and calibrated it on the Sun. On Sunday morning at 02:23 I made VK7MO (-17 / -21) from QG37te as {# 45} and on Monday from QG38kl (-16 / -19) {# 46} followed by VK3NX (-15 / -16). In the next days, I worked always in the mornings, along with others, VK7MO from the squares QG39dw, QH30fa, QH31ar, QH32qh and QH23ua {# 47-51}. Rex's expedition to Qeensland is fascinating again. With daily regularity, the window opens to the US and the EU from a new field. The conditions vary according to where he can find the site, see photo. Rex is 76 and for EME (but also terrestrial) digital communication is a real expert. It is therefore a pleasure to make QSOs with him. From the EU, he is working with us on a regular basis 5-6, he has given us ringing tones and even without the HB9Q logger he can organize us and gradually the Moon will make us.
RexJune2018 
On Saturday and Sunday, DUBUS held a 3 cm contest. I worked CW with SP6JLW (O / O), OK1KIR (O / O), OK1CA (O / 549), OZ1LPR (579/529) and DL7YC (O / O) {# 52}. Outside the  contest QRA64D  with  K6QPV (-14 / -16) {# 53}. The following week Rex continued north into squares QH24fk, OH16ob, OH17hu and great expedition ended in most northerly australian grid QH19 (QH19ec). All QSOs were successful with him {#54-57}. Thank you very much, Rex. I also finally worked on 22 June at 15:12 using QRA64D UN6PD as {#58} and DXCC 23 (-18 /-17) and ended using JT4F in a test QSO with G3WDG.
In addition, I have been working on parameter measurement. I was pleasantly surprised to measure my own echo with the latest version of WSJTX. Echo shows the exact compensation of Doppler shift CFOM (with step 2 Hz) at low width 13 Hz and 21 accumulations. Used offset dish 1.2 m; 42 W; 0.8 dB N.F. 
OwnEcho

May 2018

In the third week of May I planned a 3 cm EME activity. On the one hand, the expedition of the Q-team in the Balearic Islands - EA6 started and also A.R.I. contest promised more activity at the end of the week. The EME conditions should also be very good. After many weeks of drought, however, it began to rain from Wednesday two days so I could only begin to build a dish until Thursday afternoon. On Friday, I tested the EME setup with a perfect qso with Charlie HA / G3WDG, which also has a 1.2 m aperture and 50 W power (-18 / -19).  There followed a connection with Al W5LUA (-12 / -16).   I made a new {# 36} DL6ABC (-13 / -21) and  HA / G3WDG (-18 / -19) again on Saturday at MR. On Sunday was the first {# 37} OK1DFC (-17 / -16). We have been doing several times with Zdeněk, but it has always been somewhere in the world. There was a test qso with Franta OK1CA (-15 / -15). EA6 / HB9COG (-17 / -18), followed by EA3HMJ (-14 / -17), random OK1DFC (-18 / -19) and UR5LX (-16 / -16). The evening ended with a nice connection with Al K2YUH (-18 /-17) {# 39}.
WAC10GHz
 
October 2017

I followed Zdeneks (OK1DFC) dxpedition trip to Morocco, and very much appreciated how he solved his very knotty problem of providing microwave operation from Africa. I was able to QSO on 6 Oct using JT65B on 432 EA9LZ (O/O) for digital initial {#29}, and on 8 Oct using QRA64D on 10 GHz EA9LZ (20DB/21DB) for digital {#33} and WAC on 3 cm! I also QSOd using QRQA64D on 10 GHz, on 8 Oct DF1OI (13DB/15DB) {#34}, and on 9 Oct G4CBW (19DB/20DB). I QSOd on 3 cm using QRA64D on 19 Oct [HB9Qs Africa dxpedition] 3DA0MB (19DB/20DB) {#35}, G4KGC (11DB/14DB), OZ1LPR (11DB/20DB) and DF1OI (13DB/16DB).

3DA0MB

September 2017


End of the holiday season I spent at our country house on 3 cm EME -- I worked VK7MO from QF78xc for digital initial {#30}. In the ARRL MW Contest, I QSOd OK1KIR (14DB/16DB), OZ1LPR (8DB/18dB), WA3LBI from DE, FM28lo, (15DB/18DB) {#31}, G3WDG (11DB/14DB), UR5LX (18DB/14DB), OK1CA (17DB/17DB), SP3XBO (18DB/13DB) {#32}, N4EME (16DB/18DB), VE4MA (17DB/15DB), N9JIM (17DB/18DB) and HB9Q (12DB/15DB). Besides these digital QSOs made using QRA64 or JT4F, I worked also OK1CA (O/O) and OK1KIR (O/O) on CW. My total score is 11x9 or 9900 points.

July - August 2017


This summer I started operation on 3 cm EME on 29 July I QSOd G3WDG (15DB/11DB) using WSJT-X QRA64D and CFOM Doppler compensation, followed by a QSO with W3LBI QRA54D (17DB/17DB), and on 30 July OK1KIR QRA64D (13DB/13DB) and JT4F (16DB/16DB). I worked on 3 Aug G3WDG QRA64D (15DB/16DB), and on 8 Aug joined VK7MOs VK grid dxpedition. The conditions were far from optimal degradation 2 dB and spread around 150 Hz, but I QSOd VK7MO (23DB/23DB) for my digital initial {#19} in PH44 using QRA64D and CFOM, and continued QSOs using QRA64D unless noted otherwise on 9 Aug VK7MO (22DB/24DB) in PH43cq {#20}, on 11 Aug VK7MO (24DB/22DB) in PH31us {#21}, on 14 Aug VK7MO (22DB/23DB) in PH11gx {#22} and HA/G3WDG (18DB/19DB) with 1.2 m dish and 50 W, on 15 Aug VK7MO (21DB/23DB) in PH12ga {#23}, on 18 Aug VK7MO (22DB/24DB) in PG09ax {#24}, PA3DZL using JT4F (18DB/13DB), on 19 Aug JA1WQF JT4F (17DB/17dB) {#25} and SP/OK5EME (19DB/24DB) {#26}, G3WDG (10DB/19DB), again SP/OK5EME (18DB/16DB) with minimal spread around 10 Hz, and finally PY2BS using JT4F (18DB/18DB) {#27}. My new station setup is a 1.2 m offset dish, 0.8 dB N.F. and a 42 W GaN SSPA.

June, 24. - 25. 2017  - new setup
feed offset dish
   
ARRL2016

3 cm AW in July 2016
G3WDGdish
G3WDG portable setup

The last EME activity weekend as well as the whole previous week were accompanied by varying weather with strong storms and rain. Thus, our EME activity was affected too. During this week I had worked eight QSOs by JT4F and one QSO CW. Worth mentioning is a QSO with G3WDG where we tested his new portable setup with 4ft dish. Mode was JT4F, Doppler compensation method CFOM and exchanging reports -11/-21 dB. Charlie used 100 W PA in the feed point with two TGA2312 GaN modules. During the weekend I had worked JT4F OZ1LPR, WA3LBI, OK1KIR, G3WDG, HB9Q and CW OK1KIR.



MyEcho250716
Echo on July 25 at 06:45 UTC
MW EME OK2AQ
 
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 Rexs 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!