EME LOG 1296 MHz - OK1TEH JO70FD   (1m dish + 400W @ feed)
QSOs worked by OK1TEH on 23 cm : white - JT65, yellow - ICW, blue - contest
Loc: JO70FD   QTH: Prague, Capital city of Czech republic     320 m.a.s.l.

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Date     | UTC  |   QRG  | Call   | TX/RX |  Max   | Loc  | km |  ANT + PWR       |init|           WAS | WAC| QSL
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25.04.07  21:09  1296035  K2UYH     R0  0  -26>-28  FN20QG 6663  8,7m DISH +  500W   1#  2101-2109  NJ   NA # QSL
29.09.07  23:13  1296087  G4CCH      0 R0  -29>-27  IO93QL 1102  5,4m DISH +  450W   2#  2300-2313          # QSL
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06.01.09  22:20  1296065  HB9HAL    R0 -21 -27>-21  JN47KF  524 10,0m DISH +  400W   3#  2212-2220          # QSL
11.01.09  20:26  1296060  OE9ERC    R0  0  -24>-25  JN47VL  453  8,0m DISH + 2000W   4#  2016-2026          #    
11.01.09  22:32  1296079  HB9Q      R0  0  -28>-23  JN47CG  560 15,0m DISH +  200W   5#  2226-2232          # QSL
12.01.09  22:02  1296050  F2TU      R0  0  -23>-28  JN38LG  585  7,8m DISH + 1000W   6#  2154-2202          # QSL
07.02.09  17:07  1296050  PI9CAM     M  0  3dB/529  JO32ET  635 25,0m DISH +  110W   7#  ICW  1707          # QSL
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08.02.12  21:20  1296060  I1NDP     R0  0  -27>-17  JN45AL  707 10,0m DISH +  250W   8#  2118-2120          # QSL
08.02.12  21:34  1296060  G4CCH     R0  0  -25>-23  IO93QL 1102  5,4m DISH + 1000W       2130-2134               
10.02.12  00:32  1296065  PY2BS     R0  0  -27>-25  GG66PJ 10142 4,6m DISH +  600W   9#  0030-0032       SA # QSL
25.02.12  18:18  1296090  PI9CAM    R0  0  -26>-16  JO32ET  635                          1816-1818               
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19.01.13  21:57  1296075  I1NDP      0 R0  -30>-19  JN45AL  707                          2151-2157               
13.07.13  12:28  1296050  SK6OSO     M  0  5dB/529  JO57XJ  824 25,6m DISH +  400W  10#  ICW  1228               
13.07.13  16:04  1296050  SK6OSO    R0  0  -18>     JO57XJ  824                          1600-1604               
25.08.13  00:27  1296065  UA3PTW     0 R0  -27>-18  KO93BS 1667  5,8m DISH + 1000W  11#  0022-0027               
25.08.13  07:20  1296080  OK1KIR    R0  0  -30>-24  JN79DW   26  6,1m DISH + 1000W  12#  0718-0720          # QSL
18.09.13  01:02  1296070  W5LUA     R0  0  -29>-25  EM13QC 8578  5,0m DISH +  900W  13#  0054-0102 TX            
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30.12.14  15:58  1296080  OZ4MM     R0  0  -26>-17  JO55GH  632 10,0m DISH + 1000W  14#  1556-1558               
30.12.14  16:07  1296080  DL6SH      0 R0  -28>-19  JN48SW  380  8,0m DISH +  300W  15#  1604-1607               
30.12.14  16:17  1296080  I1NDP      0 R0  -25>-17  JN45AL  707                          1612-1617               
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27.01.15  22:38  1296077  W6YX       0 R0  -29>-21  CM87WJ 9421  8,0m DISH +  350W  16#  2140-2238 CA            
21.02.15  15:58  1296065  NC1I       0 R0  -27>-22  FN32OB 6416  4,5m DISH + 1500W  17#  1556-1558 MA
21.02.15  16:20  1296088  DK0SF     R0  0  -26>-18  JN48SW  380                          1615-1620      INIT = DL6SH

23cm hrd on cw HB9BBD, 8N1EME, OE9ERC, OZ4MM    + saw on JT65C ES5PC -28dB,  DJ9YW -25dB    +I was saw by IK3COJ -25, PA3FXB -27, UA4HTS -22, DG5CST -23dB

 

23cm QRPP story:

 

One magic moment on 12th February 2012 during 23cm EME test with JA6AHB. From left: FT847 with paddle, SPID-RAS controller with H.M. wattmeter for 2m. PA's on the right from bottom: 70cm solid state PA 800W out in JT65, 2m I0JXX PA with 1kW out in JT65, 500W PA for 23cm (400W out in JT65) and on the top 28/1296MHz transverter with rubidium normal inside. On the background you can see my 2m/70/23cm EME antenna pointed to the Moon.

In March 2007 I put on mast 130x90cm dish originally used for WiFi with approximately gain of 17dBd for tropo propagation & contests. Estimated F/D is about 0,46. As feed I used linear polarized ringfeed (designed by DL4MEA), then 16m long coaxial cable H1000 (-2,5dB), 120W hybrid PA and old 2m/23cm transverter with D B 6 N T's module made in 1995 - max 12W out (the whole hardware was made by OK1VPZ). MFG1302 LNA was made by OK1CA with 0,8dB NF and about 14dB gain and LNA was installed in hamshack, IF radio has been FT847 with improved frequency stability. Immediately when I become QRV 23cm I had thought about to try my first EME test (even with poor RX), however I suffered from very high frequency instability so decoding any JT65 signals was extremely difficult. But even with such a problems  and only about 70W at feed I succeeded in QSO with Al, K2UYH and Howard, G4CCH.

As I had been more interested in 2m and 70cm EME, my 23cm operation was limited for contests and tropo opening. In 2008 I replaced 10m part of coax with 1/2" type and old 120W PA was changed by new 500W home made solid state PA with the first version of MKU PA 13500 module from D B 6 N T. However this module used old transistors  PTF141501A, which were sensitive for higher temperature and more the module has aluminium case with very bad temperature transmission. Even that the PA has several temperature protection circuits and front panel thermometer, the transistors and PCB was damaged several times , so real power from the PA was limited during low room temperature to about 200W in JT65 and 300W in CW. During January 2009 the shack temperature was very low so I risked PA damage and worked few more EME QSO's and finally my first CW contact with PI9CAM with their 25m dish. The wav file of my 23cm CW signal you can listen in MP3 on this place.

During year 2011 my father OK1VPZ finally improved the PA with new copper plate and we put in new transistors PTF141501E with much better parameters then old A type. Next step was insertion of new power circulator. However as for 500W you would need 20W driving and old transverter has only about 12W in peek, the estimated power was still much smaller then could be. The result of PA reconstruction was FB, the cooling was incredibly better. Next stop was building of new transverter which was completed in July 2011. New 28/1296MHz transverter consist of heart with D B 6 N T's transverter module MKU13 G3 28, Home-tailored "Interdigital" BPF, 30W hybrid for long time stable 20W out and rubidium normal with more 10 MHz connectors on back panel which allow to use it as 2nd reference for future transceiver - pic 1,2.

As during February 2012 we had very low shack temperature, after 3 years I tried some more EME tests and I was surprised how new stable frequency and better PA made my QRPP EME easier. Unfortunately my the biggest problem remained is radio-tower some 200m far from shack with strong DVB-T and FM BC transmitter so even I have G4DDK LNA, I'm not able to use any 2 stage LNA due to enormous HF field :-( Next main problem is lack of free space for dish, because a roof in 8th floor is private and we haven't any garden, more the dish feed is too small that any feed mounted LNA with relay would be too heavy. So next step during this year will be new design of LNA for city usage mounted in LNA's box back on rear side of dish.

Since 16th June I'm QRV 23cm EME with new home made PA made by OK1VPZ based on PE1RKI modules, 700W in CW and 600W JT65.

If you are interested in 23cm EME QSO, I'm ready for any CW or JT65 tests however I need stations with minimal 4m dish and 500W @ feed.http://ok1teh.nagano.cz/calc.png

73 -.. . Matej, OK1TEH

 

Some pictures....

http://ok1teh.nagano.cz/23cm_antsm.jpg

OK1TEH with 23cm EME antenna used for 10 142km QSO with P Y 2 BS :)  Notice the feed cover made from flowerpot :) Measured SWR about -20 dB.

Copper plate installed in PA (tnx OK1VPZ!).

   

http://ok1teh.nagano.cz/pi9cam_ok1teh_070209_23cm.jpg

http://ok1teh.nagano.cz/qsl/py2bs_23_10feb2012qsl.png

http://ok1teh.nagano.cz/qsl/i1indp_23_08feb2012qsl.png