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ADDENDUM 

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WSJT: What Is It and How Do I Get It? 

WSJT is a new weak signal mode enhancing communications with signal near or below the audible signal level.  

The 6M-1K2 amplifier is designed for the 50% duty cycle used in this mode. 

 
WSJT is a FREE program written by Nobel prize winning Physicist Joe Taylor, K1JT.  Originally designed for high 

speed meteor communications (JTM), Joe soon implemented JT65A and JT65B to accommodate the EME crowd 

of weak signal enthusiasts.  EME means “earth-moon-earth” and is commonly known as “moonbounce.” 

 

WSJT  can  be  downloaded  easily  by  going  to  the  WSJT  Home  Page  at 

http://physics.princeton.edu/pulsar/

K1JT/

. Alternately, it can be found by using Google or another search engine, typing in K1JT then selecting the 

“WSJT Home Page”.  Select “WSJT” and look down for WSJT 9.0 Beta or WSJT 7.07 (latest production version).  

Click to download to your computer.  Click “run and continue through the setup; next ,next etc and finish.  You 

should also download the “Docs” for important details needed to get WSJT running properly with your comput-

er and many other details. 

 
Look on your desktop and find a small “world” icon with WSJT9 or WSJT7.  Click on the icon and 3 screens will 

appear: 

 

One SCREEN is Black in a DOS-like format.  Hide this for now.  On the SpecJT screen, click on Options and 

check “flatten spectra” and check “Frequency Axis”. 

 

Next on the main SpecJT screen at the top click “Speed 3”.  This allows the screen to display and audio range 

of 2 KHz fro 600-2600 Hz.  Since the center of the JT65 mode is 1270 Hz, use the right <i> arrow to move 

1270 to the center. 300 to 2300 Hz will now be displayed.  When audio is inputted to your computer through 

the  “mic”  jack  or  line  input, the  screen  will turn  light  blue  and  white noise  will make  tiny  white  dots on  the 

screen.  Weak signal tones will show up as weak white vertical lines falling slowly down the water fall.  See the 
WSJT documentation for more details.  

 

Now go to the main WSJT 9.0 screen and click on “options”.  Input your call sign in place of K1JT and input 

your grid square in place of Joe’s grid.  Exit the options screen, click on “mode” and note the long list of choic-

es.  For EME use JT65A for 6M and JT65B for 2M and up. Click on JT65B for now. 

 

Next click on “Band” and check “144.”  From here on many details can be found in the WSJT docs. 

 

Here are just a few more general user tips.  Click on “View” and then on “Astronomical Data”.  A blue screen 

will appear with Moon AZ and EL for your location.  Sun AZ and EL will also be displayed for your location.  This 

is valuable for preliminary accurate alignment of your antenna system when you cannot see the moon.  The DX 
station’s moon AZ and EL will also be displayed.  The DX station is the call sign you see or is typed in the “to 

radio”  box  below.    Try  typing  in  K6MYC  and  watch  the  DX  station  AZ  and  EL  numbers  change  in  the 

“Astronomical data”  box.  Other good info is also present that will be helpful in your EME activities. 

 

Hooking up your computer to your transceiver is well covered in the WSJT documentation and is beyond the 

scope of this brief overview.  

A special EME and weak-signal primer by renowned EME expert Mike Staal, K6MYC. 

Summary of Contents for 2M-1K2

Page 1: ...VIEW INSTALLATION ADDENDUM WARRANTY M2 Antenna Systems Inc Model No 2M 1K2 2M High Power Amplifier Operating Instructions M2 Antenna Systems Inc 4402 N Selland Ave Fresno CA 93722 Tel 559 432 8873 Fax...

Page 2: ...nstallation Considerations 8 TROUBLESHOOTING 9 Troubleshooting Guide 9 Support Service and Returns 10 Schematic Diagram 11 ADDENDUM 12 Parts List 12 Specifications 13 WSJT What Is It and How Do I Get...

Page 3: ...e power supply may be purchased as a separate standalone accessory Now at home in your shack you won t need that big steel rack any more All you need is a small desktop or shelf to hold your QRO high...

Page 4: ...ED Green Lights when the JT switch is on or within 5 seconds after driving the amplifier in FM AM or JT mode with the JT Mode switch off 5 TX LED Red Indicates the amplifier is keyed to TX transmit 6...

Page 5: ...ower RG 213 LMR 400 or similar cables are suitable 12 Terminal Strip Provides connections for fans 13 6 VDC for powering external device and key out for external relay and preamp switching 1 28VDC top...

Page 6: ...re compression possible distortion and less efficient operation A temperature sensor mounted next to the device monitors the Celsius temperature of the huge copper heat spreader the device is attached...

Page 7: ...ower high current connections to two cross connected 10 ohm coax line sections These line sections form a 9 1 Impedance step and transform the very low drain impedance up to about 25 ohms balanced A h...

Page 8: ...least 3 4 above the fan guards ALWAYS keep the air intake on the bottom of the amplifier clear and free from obstructions The rubber feet are about 3 4 high maintain at least that clearance from obje...

Page 9: ...the amp again If VSWR TEMP LED still illuminates Connect amp to a 1kW dummy load and try the amp again If the amber LED lights again contact M2 Overheating very rare WARNING AMPLIFIER MAY BE HOT TO TH...

Page 10: ...e product you are writing about A synopsis of the problem The troubleshooting steps you have already taken Should you require factory service we will be happy to provide you with a Return Authorizatio...

Page 11: ...11 TROUBLESHOOTING TROUBLESHOOTING...

Page 12: ...12...

Page 13: ...13...

Page 14: ...ESCRIPTION QTY 2M 1K2 2M High Power Amplifier 1 2M 1K2 Operating Instructions 1 RSP 2400 48 power supply Operating instructions If applicable 1 3 Amp Fuse spare 1 Q3 Keying Transistor ZTX601B spare 1...

Page 15: ...fundamental frequency Input Output Connectors Type N Female Teflon insulated Preamp Relay Voltage out 13 6 VDC 5 A External Relay Control N O contacts rated 250 mA Keying Key to Ground RCA Jack 10mA m...

Page 16: ...600 2600 Hz Since the center of the JT65 mode is 1270 Hz use the right i arrow to move 1270 to the center 300 to 2300 Hz will now be displayed When audio is inputted to your computer through the mic...

Page 17: ...g and real time EME 1 chat room should pop up in green background with white type You can log in and use the chat by going into the RED letter section User update details Fill in the requested informa...

Page 18: ...Some states or provinces do not allow the exclusion or limitation of liability for consequential or incidental damages so the above limitation may not apply In the event repair or replacement are nec...

Page 19: ...19...

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