WSJT Meteors, Moonbounce, in addition to More How to push the DX Limits on VHF/UHF b in addition to s WSJT: What is it Requirements as long as optimizing minimal QSOs Design of FSK441

WSJT Meteors, Moonbounce, in addition to More How to push the DX Limits on VHF/UHF b in addition to s WSJT: What is it Requirements as long as optimizing minimal QSOs Design of FSK441 www.phwiki.com

WSJT Meteors, Moonbounce, in addition to More How to push the DX Limits on VHF/UHF b in addition to s WSJT: What is it Requirements as long as optimizing minimal QSOs Design of FSK441

Elkjer, Thom, Contributing Wine Editor has reference to this Academic Journal, PHwiki organized this Journal WSJT Meteors, Moonbounce, in addition to More Joe Taylor, K1JT Mid-Atlantic States VHF Conference September 24, 2005 FSK441 JT65 JT6M How to push the DX Limits on VHF/UHF b in addition to s Wait as long as a b in addition to opening Get a bigger amplifier Bigger antenna, better feedline, low-noise preamp, Use efficient coding in addition to modulation – or – WSJT: What is it A computer program Provides modulation in addition to encoding/decoding, as in PSK31 Offers several modes FSK441 as long as meteor scatter JT6M as long as ionoscatter on 6m JT65 as long as EME CW as long as EME

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Requirements as long as optimizing minimal QSOs Meteor scatter Speed > 100 cps Good copy at 0 dB S/N in SSB BW EME Speed 0.3 cps Good copy at –20 to –30 dB S/N Design of FSK441 Four-tone FSK: 882, 1323, 1764, 2205 Hz Three tones or “symbols” per character Keying rate 441 baud Transmission rate 147 cps Detection b in addition to width 4 × 441 Hz Short messages sent repeatedly 30s T/R sequences Design of JT6M 44-tone FSK Sync tone every 3rd symbol Keying rate 21.5 baud Detection b in addition to width 44 × 21.5 Hz Short messages sent repeatedly Message averaging 30 s T/R sequences

Design of JT65 Structured messages Sync tone plus 64 data tones Keying rate 2.7 baud Detection BW 66 × 2.7/5.4/10.8 Hz Powerful Error-Correcting Code Short messages: RO, RRR, 73 T/R sequences 60 s FEC in JT65 Seems like magic Mathematically rigorous RS(63,12) code, 6-bit symbols Corrects 25 (or even more) symbol errors “Deep search” does 4 dB better Soft-decision decoder by Koetter in addition to Vardy (US patent 6,634,007) Compressed in addition to Encoded JT65 Messages Message Compressed to 72 bits (12 six-bit symbols) ———- 1. G3LTF DL9KR JO40 61 37 30 28 9 27 61 58 26 3 49 16 2. G3LTE DL9KR JO40 61 37 30 28 5 27 61 58 26 3 49 16 3. G3LTF DL9KR JO41 61 37 30 28 9 27 61 58 26 3 49 17 First 21 (of 63) encoded channel symbols, including FEC: ———- 1. 14 16 9 18 4 60 41 18 22 63 43 5 30 13 15 9 25 35 50 21 0 2. 20 34 19 5 36 6 30 15 22 20 3 62 57 59 19 56 17 35 2 9 41 3. 47 27 46 50 58 26 38 24 22 3 14 54 10 58 36 23 63 35 41 56 53

Does it work Several thous in addition to users, worldwide You can work “anyone” at 500 to 1300 miles on 6 or 2m, any time K1JT on 2m (4 x 9 el, 700 W): WAC EME initials 109 DXCC 39 Grids 268 WAS 42 Measured sensitivity Measured sensitivity of JT65 Measured “sync in addition to shorth in addition to ” sensitivity

What equipment do I need Windows computer with sound card Minimum: 400 MHz Pentium II, 64 MB RAM (you’ll be happier with more) WSJT software: free download Simple interface, serial port to PTT Audio connections, sound card to radio Installing WSJT Free download from WSJT home page: http://pulsar.princeton.edu/~joe/K1JT Self-extracting EXE file — “click-click!” Includes a detailed manual in PDF as long as mat full description of each mode screen pictures operational hints index of controls technical appendices

VK7MO EME DXpedition Destinations: Cocos-Keeling Isl in addition to (VK9C) in addition to Christmas Isl in addition to (VK9X) B in addition to s: 144, 432 MHz Antennas: single yagi on each b in addition to Power: 300 W on 2m, 65 W on 70 cm Mode: JT65B

VK7MO DXpedition Scorecard EME QSOs on 2m: 156 EME QSOs on 70 cm: 6+ Nearly all QSOs r in addition to om: no internet

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to the demos

ZS5LEE works K1JT on 2m ZS5LEE works K1JT on 2m K1JT works RN6BN on 2m

Elkjer, Thom Contributing Wine Editor

Elkjer, Thom is from United States and they belong to Vine Wine Country and they are from  San Rafael, United States got related to this Particular Journal. and Elkjer, Thom deal with the subjects like Wine

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