SMALL STATION EME ON 70 AND 23 CM USING …

1 SMALL STATION EMEON 70 AND 23 CM USING JT44/65BY AL, K2 UYHOBJECTIVESOBJECTIVEStGET YOU INTERESTED IN WORKING EME. (Most hams still believe exotic equipment, huge antennas, and very high power are needed to work EME.)tSHOW THAT YOU CAN ENJOY THE THRILL OF MOONBOUNCE WITH A MODEST SETUP. (Basically the equipment you already have.)tINCREASE EME ON 432 AND 1296 MHz. (There is already a lot of SMALL STATION EME on 6 & 2 m.) WHY WORK MOONBOUNCEWHY WORK MOONBOUNCEtIT IS EXCITING! tMOST FUN IN HAM RADIO IS MAKING RARE, UNUSUAL, OR DIFFICULT ALLOWS YOU TO WORK WORLDWIDE DX ON ANY BAND -6 M UP. tWAY TO INCREASE YOUR GRID SQUARE AND STATE COUNT. K2 UYHK2 UYH70 & 23CM 70 & 23CM EMEEMEA BIG STATION IS NOT NEEDED!A BIG STATION IS NOT NEEDED!tMY 1 STJT44 CONTACT WAS ON 23 CM WITH WAS USING 2 X 22 dBi YAGIES (LINEAR POL.) AND 40 QSO WITH OH1FF/p2 NDJT44 QSO WITH OH1FF/ptOH FIELD DAY STATIONtALSO ON 23 CMtUSING A M DISH (CIR.)

2 POL?) AND 50 WtWE COULD HAVE QSO D VIA CW, BUT JT44 DEFINITELY HELPED!1 STJT44 ON 70 CM WITH ES8X1 STJT44 ON 70 CM WITH ES8 XtEUR. VHF FIELD DAY STATION ON KIHNU ISLAND (KO18xc). t4 x 12 EL YAGIS (WITH ELEV.) AND 300 W MHz432 MHzKIHNU IS A SMALL ISLAND ABOUT 40 KM OFF THE COAST OF ESTONIA IN THE GULF OF RIGA, BETWEEN ESTONIA AND LATVIA. (IN ESTONIA)1 STJT44 ON 70 CM WITH ES8X1 STJT44 ON 70 CM WITH ES8 XtEUR. VHF FIELD DAY STATION ON KIHNU ISLAND (KO18xc). t4 x 12 EL YAGIS (WITH ELEV.) AND 300 W MHz432 MHzK2 TXB OPERATES JT44 ON 2 mK2 TXB OPERATES JT44 ON 2 mtRUSS USES 2 X KLM 16 LBX YAGIS ON A POLAR MOUNT AND A 42 STATIONS IN 15 COUNTRIES AND 15 STATES EME PRACTICEEME PRACTICEtEME OPERATED USING CONVENTIONAL(CW & SSB) OR DIGITALMODEStSOME STATIONS ARE EXPERIMENTING WITH DIGITAL MODES AS PUA43 THAT PROVIDE MANY DB ADANTAGE, BUT REQUIRES SPECIAL EQUIPMENTAND TRADES TIME AND PRECISE FREQUENCY FOR SIGNAL DIGITAL EME IS WITH JT44 STANDARD EQUIPMENT, WORKS IN VIRTUALLY REAL TIME AND HAS RELAXED FREQUENCY BASICS -TXJT44/65 BASICS -TXtEACH TRANSMISSION IS 30/60 SECONDS LONG AND CONSISTS OF MESSAGE AND SYNC INFORMATION.

3 (*JT65 CAN DECODE BF TX).tTHE MESSAGE IS 22/13* CHARACTERS LONG AND REPEATED 3 TIMES IN SYNC IS INTERSPERSED WITH THE MESSAGE AND SENT ABOUT HALF THE UNIQUE FREQUENCY IS ASSIGNED TO LETTERS, NUMERALS AND PUNCTUATION CHARACTERS (43 TONES) + SYNC = 44!tJT65 USES ERROR CORRECTING CODE --6 BITS/SYMBOLE (64 TONES) + SYNC =65! JT44/65 BASICS -RXJT44/65 BASICS -RXAT THE END OF THE RECEPTION PERIOD JT44/65: SEARCHES FOR TIME SYNC (SYNC PATTERN) OVER -4 TO 2 SECOND DELAY PERIOD. SEARCHES FOR FREQ OFFSET (+/-600 Hz). DETERMINES AND DISPLAYS MESSAGE. JT44 -AVERAGES CHARACTERS IN EACH TIME SLOT OF THE 22 CHARACTER MESSAGE. JT65 USES REED SOLOMON ERROR CORRECTION NO GIBBERISH! JT65 HAS SPECIAL CODES FOR O , OR , 73 VE7 BBG S JT44 SIGNALCOR RUNS A DISH AND 120W AT THE FEEDVE7 BBG S JT44 SIGNALCOR RUNS A DISH AND 120W AT THE FEEDTIME SYNC FREQ -TIME AMP-AVERAGING IN JT44 AVERAGING IN JT44tWHEN A SIGNAL IS STRONG CAN GET FULL COPY IN A SINGLE SEQUENCE (QSO in < min!)

4 TOFTEN SIGNALS ARE WEAK AND THE MESSAGE GARBLED (This is where JT44 s averaging pays off.)tIF THE SAME MESSAGE IS SENT EACH SEQUENCE, JT44 WILL AVERAGE THE RESULTS OF ALL MESSAGE WILL CORRECT ITSELF WITH EACH SUCCESSIVE PERIOD. AVERAGING MADE THIS QSO POSSIBLE!AVERAGING MADE THIS QSO POSSIBLE!JT65 VS. JT44JT65 VS. JT44tJT65 HAS 3 MODES: A, B AND C. JT44 TONE SPACING (Hz) ADVANTAGE ------tSPECIAL CODES HAVE EVEN GREATER SPREADING AT HIGHER BANDS DEGRADES JT65 S PERFORMANCE (if W > 5 use C).OK1 DFC S JT65C SIGNALZDENEK RUNS A SINGLE YAGI ON HORIZ WITH 1 kWOK1 DFC S JT65C SIGNALZDENEK RUNS A SINGLE YAGI ON HORIZ WITH 1 kWTIME SYNC FREQ -TIME AMP-HE S WORKED 2 YAGI STNECHO MODE WANT TO TRY EVEN IF DON T USE JT4465 FOR EME!ECHO MODE WANT TO TRY EVEN IF DON T USE JT4465 FOR EME!tLET S YOU EVALUATE EME SYSTEM GOOD FOR 70 CM COPIED ECHOES WITH 200 W ON HORZ WITH TROPO STATION . STATION REQUIREMENTSSTATION REQUIREMENTSIT DEPEND ON HOW BIG THE STATION IS ON THE OTHER SIDE?

5 TON 70 CM SINGLE LONG YAGI AND > 100 W. ** WANT TO ELEVATE (REALLY A MUST)! ** PREAMP AT THE ANTENNA (AND PA AT ANT). ** POLARIZATION ROTATION?tON 23 CM SINGLE LONG LOOP YAGI OR 5 DISH WITH CIRCULAR FEED AND > 50 W. ** CIRCULAR POL GAIN + 3 dB!PORTABLE EME DL3 OCH STYLEPORTABLE EME DL3 OCH STYLEtBODO USES IC-706, HB TRANSVERTER WITH 100 W AND A 59 EL YAGI (5 m long & dBd) FROM HIS DL, HE HAS OPERATED FROM 3A, HB0, IN GIBRALTARZB2/DL3 OCH IN GIBRALTARBODO CHOSE TO USE JT44 FORTHIS NEED A COMPUTER AND SOUND CARDYOU NEED A COMPUTER AND SOUND CARDtSHOULD RUN 32 BIT VERSIONS OF THE WINDOWS OPERATING SYSTEM AND BE FAST ENOUGH TO HANDLE JT44/65 AND SEVERAL OTHER 300 MHz PENTIUM OR BETTER WITH WINDOWS 98 OR PREFERABLY WINDOWS 2000 OR XP WILL BE MORE THAN TO INTERFACE THE COMPUTER TO YOUR RIG: 1) PTT FROM SERIAL PORT (VOX will work), 2) TX AUDIO FROM AUDIO OUT OF SOUND CARD, & 3) RX AUDIO TO INPUT OF SOUND CARD.

6 (DL3 OCH uses Acer laptop 650 MHz Celeron) OTHER SPECIAL REQUIREMENTSOTHER SPECIAL REQUIREMENTStFREQUENCY ACCURACY AND STABILITY ** WANT TO BE WITH IN +/-600 Hz. (No problem on 144 MHz, but on 1296 Can tune?) ** FREQ DRIFT < FEW Hz IN 30 SECS. ** I USE GPS SHIFT CORRECTION ** NOT IMPORTANT ON 144, BUT SIGNIFICANT ON 432 (can be > 1 kHz) AND 1296 (can be > 3 kHz). ** MUTUAL DOPPLAR CAN BE VERY DIFFERENT FROM LOCAL ECHO SHIFT! ** JT44 HAS BUILT IN CORRECTION. (DL3 OCH nothing special)OTHER REQUIREMENTS CONT DOTHER REQUIREMENTS CONT DtMUST KNOW TIME TO ~ 1 SECOND. ** I USED RADIO SHACK WWV CLOCK AND SET MY COMPUTER BEFORE SKEDS ** SOFTWARE IS AVAILABLE TO AUTOMATICALLY TO UPDATE YOUR CLOCK VIA THE INTERNET < >.

7 ** CAN ALSO USE GPS BE ABLE TO TRACK THE MOON ** JT44 HAS BUILT IN TRACKING.(DL3 OCH has GPS & digital radio clock)CONCLUSIONCONCLUSIONtEME WITH JT44/65 IS NEW AND S NOT JUST HAVING A YAGI, A100 W AND A COMPUTER!tTHE COMPUTER DOES NOT DO EVERYTHING FOR YOU!tIT IS PRETTY EASY WITH A BIG STATION , BUT THERE IS STILL A LOT TO IT: ACCURATE FREQ AND TIME, MOON TRACKING, DOPPLAR, POLARIZATION (ON 432).tWITH A WEAK STATION , ALL THE ABOVE PLUS MUST UNDERSTANDING HOW TO USE JT44/65 FULLY (EXCLUDE/INCLUDE, CLEAR, FOLD, FREEZE, CLIP, ETC.)tFOR SKEDS CHECK INTO K1 RQG S 20 M NET ( MHz 1600Z SAT & SUN) AND READ 70 CM & UP EME NEWSLETTER < >. A LOT OF FOLKS,tESPECIALLY JOE, K1 JTtAND RUSS, K2 TXB MY JT44 MENTOR,tAND TO ALL OF YOU FOR